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Toothpick bridge that holds the most weight to lose in a week: Students’ Lightweight Structures Hold Up Under High Pressure

A little Algebra

Matthew Cox
Saturday, January 2, 2021
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  • Click on the Subscribe menu at the top of the page.

  • So far I feel sufficiently humbled to have lost two toothpick bridge competitions for two trusting students.

  • Send Cancel.

  • The bridge held 3 pavers and then collapsed on the fourth.

  • A variety of pasta dishes are based on it and it is frequently served with tomato sauce or meat or vegetables.

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In your project, however, you tl be making the trusses by joining toothpicks. Another force to handle is compression, which tries to exert a push on the bridge and shorten it in the process. Take your pick. All in all, I am sure my son learned more with my help, than he might have without it.

  • Click on the Subscribe menu at the top of the page.

  • Pins, waxed paper, and now paper clips are a great help to holding things in place while the glue dries.

  • That was just a way to get Maker's attention, before complimenting him on his skills, as it looks like he could apply it to train modeling. May 6,

  • Which Brand of Battery Lasts the Longest. Toothpick Bridge is a great Science project to test your Physics and engineering skills.

  • Since every competition is slightly different, decide what your goal is, to learn, or to win? This one has a deck supported by an arch below it.

Probably the most fun is doing the various well sites found here where the oil field has run olse I thought about making a huge compass, but that was impractical. Plus no kits actually match what I am modeling, as it is based on real buildings and associated fixtures. What is Plasma Cutting? Rating Vote:. My class is doing this project too and this helped create an idea so we can be successful.

Construct the framework. What is important to learn is what makes a good design, and what are the 'weak points' in the design. Roughly people visit my site per day, but noone has lifted a finger to help me fund this little internet adventure. Toothpick Bridge.

Toothpick Bridge Designs

Fine modeling, indeed. New Post. Try using the spaghetti and other spaghetti forms.

Send Cancel. The remainder of bikes are my SOMA Double Cross cyclocross bike and older frames turned into a variation on a cyclocross bike, with off road tread and plenty of tire volume. We quickly discovered that spaghetti is not very strong! I used wood glue instead of hot glue in this project. The person whose bridge has the highest ratio wins. Its diagonals are usually parallel and slope towards the centre of the bridge, as demonstrated in the illustration below.

ALSO READ: I Need Serious Motivation To Lose Weight

What is your favorite building style? Click on the Subscribe menu at bolds top of the page. My first layout was years ago and was when I was still in the "oilfield" who moved me at least every year - so no scenery and nothing large or bulky. Try using the spaghetti and other spaghetti forms. Score 1 Score 2 Score 3 Score 4 Score 5. The Warren truss is most easily recognised by its use of equilateral triangles where all three sides of the triangle are equal in length. Its diagonals are usually parallel and slope towards the centre of the bridge, as demonstrated in the illustration below.

Before starting the construction, it is important to hhe on the design of your bridge. The glue outside the joint is just for show, it really doesn't enhance the strength of the connection. The strongest toothpick bridges have very big ratios of their own weight to the maximum weight they can handle. There is a balance between design and safety. The weight limit for this set of rules was grams. If you would be interested in more detailed instructions or other designs, let me know that as well.

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Well, you have tiny sticks of wood, and white glue. Construction technique is of great importance to success. The Toothpick Bridge-Construction Construction technique is of great importance to success. The Toothpick Bridge.

The first 'flap' of the struts between the arches were assembled while still flat. In addition to that, natural phenomena like wind currents, rainfall should also be combated. To find this, one must use finer methods of testing. Starting to form a catenary. With all the struts, this toothpick bridge weighs 86 grams. Water Bottle Rocket.

Best one I did was a brass model of EBT I do not care if it could hold a car and then break, I do not want a broken bridge. Even my cyclocross bike has mountain bike sized tires. Try using the spaghetti and other spaghetti forms. Because it can be hard to predict traffic conditions and because they change so regularlythe Warren truss is often considered insufficient in versatility, and engineers often opt for newer, more reliable designs. In this article, we explore the 4 basic types of truss bridge.

Construction

READ: What type of icing is a carburetor susceptible to? The wood glue Maker used for tooth picks would soften the pasta. I do not care if it could hold a car and then break, I do not want a broken bridge.

Start connecting the blocks Make longer pieces from the building blocks. When my son came home from 8th grade with the same assignment, I thought I would document our process on a web page. Pinning the arches to the foamcore allows the first connecting pieces to be added, assembling a 3d framework. With all the struts, this toothpick bridge weighs 86 grams. It is a non-sanctioned test I have done of my own accord. The weight limit for this set of rules was grams. All rights reserved.

ALSO READ: Olympic Time Trials Swimming Schedule To Lose Weight

Water Bottle Rocket. The bridge held 3 pavers and then collapsed on the fourth. By loading bricks on top of students work, the instructor misses out on a great teaching opportunity. Here's the link A little glue testing A little Algebra

That separation means has about a dozen varieties to it, all still present out there, and at one wfight there were more than a dozen manufacturers of the walking beam type jack all with a twist on how to build these. Ingenuity, Integrity, and Intelligence. I hope that you enjoy my new video! Borders and Frontiers Looking for more? We had to build it using only use two materials: toothpicks and glue.

Those bikes are the exception in my collection. I hope that you enjoy my new video! I switched to HO very quickly when I decided detailing was the best I could do with the hour work weeks in the oil field, and little time to prepare for the yearly move. I had the wheels rebuilt with original rims and hubs. This particular bridge was able to hold the maximum 30 pounds.

Make a Toothpick Bridge

Well, you have tiny sticks of wood, and white glue. Start with a small quantity of water and gradually increase the level. Egg in Vinegar Experiment. Quest for the best While you're here, let me know what you think of this page in an email. Rubber Band Car.

By laying waxed paper over that and using pins, we pinned the design and wax paper to a piece of 'foam core' get this at an art supply store. I am disappointed with the methodology of the bridge test. Toothpick Bridges. While almost all bridges have the basic structure of a deck the horizontal surface you walk or drive on supported by piers vertical formations there may be pronounced variations in their patterns. One thing to learn is to take advantage of every opportunity the rules allow. While piling up coins at one point on the bridge, keep this in mind — real bridges mostly have vehicles running across them. Hence, make amendments in your testing mechanism accordingly.

Table of Contents. I have an electric one that is a model of the polar express. Happy bridge-building! Keep it up. I even sub-contacted to the local train store, in the area where I was located, to repaint and decal customer's trains for the store.

The Toothpick Bridge-Construction

Since every competition is slightly different, decide what your goal is, to learn, or to win? The arch is built from either end of the bridge and can have a pillar or any vertical structure at its center. Roughly people visit my site per day, but noone has lifted a finger to help me fund this little internet adventure.

I decided to bend a ruler and trace to the formed arc. Weeight working 7 days a week and the thyroid issues that are not going so well, I may never get back to building my own stuff. Truss bridges are a popular bridge style due to their versatility. Originally, because their larger parts were constructed from wood, it was a popular design because it was cheaper to build. Are there any specs on the toothpick bridge TPB? Originally, spaghetti was notably long, but shorter lengths gained in popularity during the latter half of the 20th century and now it is most commonly available in 25—30 cm 10—12 in lengths.

The results were surprising and counter to what I expected. Milk and Food Coloring. When my son came home from 8th grade with the same assignment, I thought I would document our process on a web page. A trip to RadioShack gets us an amazing ally in the fight for great glue joints.

  • Maggie Harris. Do you mean the type of building I am modeling, or the type of construction needed to model it?

  • Construct the framework. This one has a deck supported by an arch below it.

  • I actually used this bridge with my model train set at home.

  • Add a few weights to judge the capacity of the bridge.

Well, I needed glue for woodworking anyway, so when Tootgpick went to Lowes to buy the glue, I thought,"hey, why not buy several types -- and test them to see which one is the strongest! Now to assemble the parts. For this, you can go through good books on bridges with illustrations. This one has a deck supported by an arch below it. Toothpick Arch Bridge. Start with uniform building blocks I decided to make easier building blocks by first gluing toothpick 'head to toe', as it were, and by putting the fat end and the skinny end together, we get a uniform width, flat, and stronger, building block. What is important to learn is what makes a good design, and what are the 'weak points' in the design.

One note for the future. Pins, waxed paper, and now paper clips are a great help to holding thta in place while the glue dries. The design relies on the four catenary arches to transfer the weight of a load to the four feet on each side of the bridge. This bridge failed because the joints between the arch and struts failed. Alligator clips! Think of each place where building blocks are glued together as 'rivets' in your bridge.

There is a balance between design and safety. On in whole or in part without permission is prohibited. One day before the contest, my son told me that his instructor was planning to use 'paving stones'. Here's the link A little glue testing More pins can be used to bend the long straight piece along the desired curve.

Search for:. This one has a deck supported by an arch below it. There is a balance between design and safety. Luckily I have other children who will benefit from our knowledge.

When did you get interested in scenery making? From there I built it layer by layer. Wood is good. No more "Almost" Good Answers. All rights reserved. You had 10, I come up with 10,

Start with a small quantity of water and gradually increase the level. When my son came home from 8th grade with the same assignment, I thought I would document our process on a web page. Strong Toothpick Bridge.

  • May 6,

  • At that time, we designed and built the bridge, but in the interest of getting it built, we did not use the formula for a catenary, I think we simply dangled a chain like the ones the pens are attached to at the bank in front of a posterboard and drew the curve.

  • I even sub-contacted to the local train store, in the area where I was located, to repaint and decal customer's trains for the store.

  • I recently decided to calculate the forces in the struts of a typical catenary truss. Crushing the work with bricks is entertainment, not unlike a monster truck rally.

My first layout was years ago and was when I was still in the "oilfield" who moved me at least every year - so no scenery and nothing large or bulky. Makes it easy omst you can still walk out back with a camera, a sketch pad, and a tape measure and record the actual dimensions of each part. The Warren truss is still a popular bridge design however, as it is quick and easy to construct and requires a minimal amount of materials. Bridge failures can lead to injuries, loss of life, and property damage on a scale equal to plane crashes, terrorist attacks, and natural disasters. I actually used this bridge with my model train set at home.

  • We tried sticking about 20 pieces of spaghetti into the styrofoam disk.

  • Start connecting the blocks Make longer pieces from the building blocks.

  • I do not want to test it any further!

  • It should also have the capacity to withstand tension, that is, the force which tends to pull apart or elongate the bridge.

The oil well jacks I do wsek would be impossible in N scale - at least the shallow well ones we have here in NW Pa. We quickly discovered that spaghetti is not very strong! Think I want to invite him to Vegas Press ESC to cancel. Skip to content Home Physics What is the main purpose of having a bridge?

That may be a good project idea ho,ds me! In our earlier article, Truss Bridges: Advantages and Disadvantages we looked at the merits of their design, cost, and versatility versus their disadvantages. I will try to get some in here later. Previous in Forum: Firewater Storage Tank. Now the layout is totally imaginary, but sections are actual towns and plant facilities I have lived in or near to and photographed and are personal to me, such as my Father's hardware. All rights reserved.

Ben Davis January 18, Now the layout is totally imaginary, but sections are actual towns and plant facilities I have lived in or near to and photographed and are personal to me, such as my Father's hardware. Sounds a bit like a big beacon to call them in for dinner. A project in math class was to build a 1, toothpick bridge over a one foot span. Yes - that is a fine scale if you want maximum operational ability in minimum space, but for scratch building any structure, that would take a person with the abilities of a watch repairer.

  • Lewis Posts: Good Answers: However, in recent years the Pratt design tends to be more popular and is slightly better at distributing force.

  • Start connecting the blocks. Starting to form a catenary.

  • The Warren truss is still a popular bridge design however, as it is quick and easy to construct and requires a minimal amount of materials.

  • I would like to hear about the rules for various contests and how the grading and testing is done.

I'm modeling some of them. I did not use and clamps in building this bridge. I have an electric one that is a model of the polar express. Learn More. Borders and Frontiers Looking for more? Probably the most fun is doing the various well sites found here where the oil field has run since Truss bridges are a popular bridge style due to their versatility.

This 'cosh' function is the hyperbolic cosine. There is a balance between design and safety. How to Build a Toothpick Bridge. Start connecting the blocks Make longer pieces from the building blocks.

The first 'flap' of the struts between the arches were assembled while still flat. A different set of rules arose for a father in Quebec, who was kind enough to send me his story. Before starting the construction, it is important to decide on the design of your bridge.

Organizers of most bridge-building contests rank these bridges, highly. Toothpick Bridge Designs. Since every competition is slightly different, decide what your goal is, to learn, or to win? They work in tandem like a regular truss with struts that connect the upper arches to the lower archs.

The results were surprising and counter to what I expected. Well, I needed glue for woodworking anyway, so when I went to Lowes jost buy the glue, I thought,"hey, why not buy several types -- and test them to see which one is the strongest! Enlisted here are a few common designs of bridges. In your project, however, you will be making the trusses by joining toothpicks. The numbers can help you decide which members to reenforce the most, and how to design the connections with the idea of compression or tension in mind. The way you design it is important because your bridge should have a proper balance while at the same time being sufficiently strong.

This was a very good choice. The train is an excuse to build buildings and do scenery. My dad had a large "HO" layout in the basement when I was growing up. Send Cancel.

Begin typing your search term above and press enter to search. Ingenuity, Integrity, and Intelligence. The K truss bridge design was a variation on another Pratt truss style, called the Parker truss. My current workplace, an OEM manufacturer, where I'm doing the first location, was a pre-fab type of metal building tacked onto an oil field galvanized metal over wood type building. The oil field power house is also a hodge podge of designs.

Search for:. What is important to learn is what makes a good design, and what are the 'weak points' in the design. Keep a few design blueprints handy so that you are equipped with a backup if one design fails to shape up according to your requirements. One thing to learn is to take advantage of every opportunity the rules allow.

What is Plasma Cutting? From the wear, or lack of, it obviously sat for most of the 30 years in a nice dry area. New Post. You had 10, I come up with 10, Nature's composite material.

Makes it easy when you can still walk out back with a camera, a sketch pad, and a tape measure and record the actual dimensions of each part. CR4 allows you to "subscribe" to a discussion so that you can be notified of new comments to the discussion via email. Lewis Posts: Good Answers: Students from two schools hundreds of miles apart had the same goals during events held as part of National Engineers Week : construction and destruction. My dad had a large "HO" layout in the basement when I was growing up.

Holde Name. Fine modeling, indeed. Concrete has very high compression strength, and an arch is almost entirely under compression instead of tension. Begin typing your search term above and press enter to search. A bridge is mainly comprised of girders, piers, towers, and perhaps cables. Rating Vote:. There are plenty of modelers out there who can't do this sort of thing.

The oil well jacks I do now would be impossible in N scale - at least the shallow well ones ttoothpick have here in NW Pa. Send this to a friend. Change Mode. Sponsored by local engineering societies, the contest was created as an outreach activity for local engineers who want to inspire students to get into math, science, and engineering. This turned out to be a very elegant solution. Wood See all. Even my cyclocross bike has mountain bike sized tires.

I am disappointed with the methodology of the bridge test. What is important to learn is what makes a good design, and what are the 'weak points' in the design. Starting to form a catenary. Earlier we had wooden trusses which have now been replaced by steel ones.

  • So I built another small layout devoid of scenery and saw that I really needed some. Truss bridges are considered one of the most expensive to build bridges.

  • The various designs of bridges can be tried to see which structure gives maximum support.

  • The Howe truss, patented in by William Howe, a millwright from Massachusetts, is very similar to its friend the Pratt truss; except that its diagonals face the opposite direction away from the centre. Learn More.

Now to assemble the parts. How to Build a Toothpick Bridge. Toothpick Bridges. Toothpicm, it's time for the post mortem on our bridge. This involve a little algebra. By laying waxed paper over that and using pins, we pinned the design and wax paper to a piece of 'foam core' get this at an art supply store. I am disappointed with the methodology of the bridge test.

A bridge typically has two abutments, one at each qeight. The K truss bridge design was a variation on another Pratt truss style, called the Parker truss. A bit tough to handle - heck - a bit tough to even see. Although I don't currently have a train layout, I was into "N" scale for quite awhile.

Yes - N scale. Comments rated to be "almost" Good Answers: Check out these comments that don't jolds have enough votes to be "official" good answers and, if you agree with them, rate them! READ: What 5 scientists contributed to the cell theory? On the totally fun side, I have a Mesa Runner frompowder coated bright orange and back dated to early mountain bike style with a bullhorn bar, friction shifters, and bright green cabling, pedals, and grips. My group's bridge held 54 pounds before breaking. It even had the original cabling which still worked.

Are there any specs on the toothpick bridge TPB? You must use a non-water based glue. Andrew Westman. This bridge was build more for fun than for an exact science. Doing many things to keep my mind off of other things, and I counted 10, 4 times.

It's not a classic or anything but it is pretty cool. I saw the weight of the original owner and thought this to be a smart move. I built it upside down and just used gravity. Yep, think to are right.

I saw the weight of the original owner and thought this to be a smart move. I do not want to test it any further! The remainder of bikes are my SOMA Double Cross cyclocross bike and older frames turned into a variation on a cyclocross bike, with off road tread and plenty of tire volume. I even sub-contacted to the local train store, in the area where I was located, to repaint and decal customer's trains for the store. I hope that you enjoy my new video!

That'sway too many. I have a mid range road bike from not sure of model that I rode for a while, but it is one size small for me and spray can painted. Interested in this discussion? I would like to wind my own fishing poles, noodle rods.

Bridge failures can lead to injuries, loss of life, and property damage on a scale equal to plane crashes, terrorist attacks, and natural disasters. I have one of those "stick shifted" ones, waiting for time to restore. Keep it up. We had to build it using only use two materials: toothpicks and glue.

  • On the totally fun side, I have a Mesa Runner frompowder coated bright orange and back dated to early mountain bike style with a bullhorn bar, friction shifters, and bright green cabling, pedals, and grips.

  • At the time, I tootgpick my dad's explanation of a catenary and I decided to look into that curve as a building block of the design. At that time, we designed and built the bridge, but in the interest of getting it built, we did not use the formula for a catenary, I think we simply dangled a chain like the ones the pens are attached to at the bank in front of a posterboard and drew the curve.

  • A truss is a structure made of triangles which make it very strong to withstand heavy weights.

These bridges are suitable for shorter spans. So, without further ado, I give you, the Starting to weej a catenary. While almost all bridges have the basic structure of a deck the horizontal surface you walk or drive on supported by piers vertical formations there may be pronounced variations in their patterns.

One lode before the contest, my son told me that his instructor was planning to use 'paving stones'. At that time, we designed and built the bridge, but in the interest of getting it built, we did not use the formula for a catenary, I think we simply dangled a chain like the ones the pens are attached to at the bank in front of a posterboard and drew the curve. I would like to hear about the rules for various contests and how the grading and testing is done. Luckily, it's on many hand-held calcualtors.

I did you get interested in scenery making? Their combination, their quality and their quantity, everything is crucial to make bridge strong. I have never tried that. Those bikes are the exception in my collection. Take a deeper dive from sky to ground with industry insights, trends, and innovations from our geospatial division.

Now, I know that late 's road bikes really aren't Schwinns, they are Panasonics badged hols Schwinns, but they still are nice to have. The oil field power house is also a hodge podge of designs. What is Plasma Cutting? Oh hi J! So, I have the ability to do such and don't really need help, although I'd choose styrene as the media and MEK as the glue. In our earlier article, Truss Bridges: Advantages and Disadvantages we looked at the merits of their design, cost, and versatility versus their disadvantages. Simply, Concrete, steel, and geometry.

A trip to RadioShack gets us an amazing ally in the fight for great glue joints. Something also occurred to me while doing the test. After adding some cross-bracing on the top, the span can finally withstand the weight of four bricks. In your project, however, you will be making the trusses by joining toothpicks. Start connecting the blocks Make longer pieces from the building blocks.

Toothpick Bridge Idea. Luckily I have other children who will benefit from our knowledge. Starting to form a catenary.

  • This turned out to be a very elegant solution.

  • While almost all bridges have the basic structure of a deck the horizontal surface you walk or drive on supported by piers vertical formations there may be pronounced variations in their patterns. The bridge held 3 pavers and then collapsed on the fourth.

  • My layout is about to move to a large garage out back of my house where the pesky critters have free range currently. Take a deeper dive from sky to ground with industry insights, trends, and innovations from our geospatial division.

The way you design it is important because your bridge should have a proper balance while at the same time being sufficiently strong. A school project, usually assigned uolds a physics class, or math class for junior high or high school students, The "Toothpick Bridge" problems tests the reasoning skills of kids and future engineers. The deck of this bridge is suspended from cables by vertical suspender cables. The numbers can help you decide which members to reenforce the most, and how to design the connections with the idea of compression or tension in mind.

  • That may be a good project idea for me!

  • Quest for the best While you're here, let me know what you think of this page in an email.

  • The small change simply means a change in direction of where the force is applied.

  • Comments Nikole says:.

  • That'sway too many. I decided to bend a ruler and trace to the formed arc.

Holsd in the refinery are from through the late 's. My oil field job worked out of a typical industrial cement block building with a newer pre-fab metal addition. The original arc shape was the hardest to get right. Maker could probably do it for you The remainder of bikes are my SOMA Double Cross cyclocross bike and older frames turned into a variation on a cyclocross bike, with off road tread and plenty of tire volume.

Truss bridges are a popular bridge style due to their versatility. Popular Now Week Month. You had 10, I come up with 10, It builds great bridges, easily shaped and of course the long thin strips form lovely planking that can be painted with acrylic paints. I asked the boys if they thought multiple pieces of spaghetti could hold more weight, and possibly even hold up a book. I live in a very rural area where the roads are posted 55mph, but should be lower, and red necks in pick up trucks prevail.

This one I ride quite often in summer. Machines4U February 22, My layout is about to move to a large garage out back of my house where the pesky critters have free range currently. Wood See all. Home Construction Construction Know-How.

You are now rechristened Andrew Rainman. Yep, think to are right. Lost your password? By the way, teh 10, June 14, I switched to HO very quickly when I decided detailing was the best I could do with the hour work weeks in the oil field, and little time to prepare for the yearly move.

So far I feel sufficiently humbled to have lost two toothpick bridge competitions for two trusting students. The catenary is curve made by nolds hanging chain. I would like to hear about the rules for various contests and how the grading and testing is done. You know, I really put these pages on my website as an experiment, but since so many people view the page, I thought I might try to resolve a question that always arises when defining this problem.

Toothpick Bridge Designs. More pins can be used to bend the long straight piece along the desired curve. To find this, one must use finer methods of testing. Egg in Vinegar Experiment. Toothpick Bridge.

Yes - that is a fine scale if you want maximum operational ability in minimum space, but for scratch building any structure, that would take a person with the abilities of a watch s. I have built some "N" scale bridges, what help do you need? A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. Originally, spaghetti was notably long, but shorter lengths gained in popularity during the latter half of the 20th century and now it is most commonly available in 25—30 cm 10—12 in lengths.

  • This one is in reality a Giant badged as a Schwinn. In this article, we explore the 4 basic types of truss bridge.

  • Use every bit of the weight if your goal is to win the competition.

  • Brave Sir Robin. Because the forces move quite substantially to different members or parts of the bridge depending on where the load is sitting, it is important to understand the kinds of traffic your Warren truss bridge will be subject to—and to compensate with stronger members in the relevant areas.

  • In our earlier article, Truss Bridges: Advantages and Disadvantages we looked at the merits of their design, cost, and versatility versus their disadvantages. The train struggled to get up the hill, so I had to make the climb more gradual.

  • To normalize the function, we needed to use a particular part of the curve to get the height we wanted, and then magnify it to the size we wanted. What are the strengths of the individual elements?

The train is an excuse to build buildings and do scenery. I made it solid for ease of build. May 6, The idea of the K truss is to break up the diagonal members into smaller lengths, in the hope of reducing their likelihood of buckling under pressure.

More than winning a contest, the motivation for building the best bridge should be learning how these useful constructions of daily life can be built with minimal materials but maximum strength. Think of each place where building blocks are glued together as 'rivets' in your bridge. The results were surprising and counter to what I expected. Since every competition is slightly different, decide what your goal is, to learn, or to win?

I keep forgetting the pictures when I get home in the evenings - my bicycle obsession takes over, as I have a couple of new frames to outfit and Originally, spaghetti was notably long, but shorter lengths gained in popularity during the latter half of the 20th century and now it is most commonly available in 25—30 cm 10—12 in lengths. Neat, right?!

Borders and Frontiers Looking for more? I kept the 5 speed freewheel, but had new rims and hubs built into a wheel set for this bike. I don't have a blinkin one here at work though. Interested in this discussion? Previous Article Does rubella affect a particular group? I built it upside down and just used gravity.

These bridges are suitable for shorter spans. Toothpick Truss Bridge. All in all, I am sure my son learned more with my help, than he might have without it. Toothpick Suspension Bridge. Use refined methods, like suspending a small plastic bucket from different points of the span to identify the weak points if any. Well, it's time for the post mortem on our bridge. A trip to RadioShack gets us an amazing ally in the fight for great glue joints.

Yes - N scale. I don't have a blinkin one here at work though. The oil field power house is also a hodge podge of designs. I need to get them to a flash drive to bring them here to work.

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