Scores

[Entomology]

I tried a K-truss before. It is an awesome design, my bridge held 37 POUNDS and wasn't even BOWING!!!!! The only thing is, they are pretty heavy. Mine weighed 42.5 g.

Did you use balsa, or bass? 42.5 grams is pretty heavy for a k-truss bridge. Mine was around 7 grams.

[Unome]

I tried a K-truss before. It is an awesome design, my bridge held 37 POUNDS and wasn't even BOWING!!!!! The only thing is, they are pretty heavy. Mine weighed 42.5 g.

Paraphrasing someone from a previous year's thread (I don't remember who), the ideal bridge is one in which all members simultaneously collapse at 15kg. Your bridge has a lot of dead weight.

[bernard]

I tried a K-truss before. It is an awesome design, my bridge held 37 POUNDS and wasn't even BOWING!!!!! The only thing is, they are pretty heavy. Mine weighed 42.5 g.

Paraphrasing someone from a previous year's thread (I don't remember who), the ideal bridge is one in which all members simultaneously collapse at 15kg. Your bridge has a lot of dead weight.

Also keep in mind what type of efficiency you want. The maximum efficiency a ~40g bridge can have is around 300. Do you want an efficiency of 1000? Then the most your bridge can weigh is 15000/1000 or 15 grams.

[brayden box]

Yeah, my score was really low on that one. It was my first bridge i had ever built, i built it two years ago. It was out of bass.

[brayden box]

Also, i made it way too big. It was about 3 inches longer than the minimum length.

[Unome]

It was my first bridge i had ever built, i built it two years ago.

That explains the score, then...

[bernard]

It was my first bridge i had ever built, i built it two years ago.

That explains the score, then...

Still impressive for a first. My first balsa builds, back when the event was Boomilever, were stuck at efficiencies of 200-300, anything above 500 was pure luck and wasn't going to happen again. For future bridges, try to lower weight. You might realize bass isn't necessary since even if it is stiff, it adds a lot of weight. And as someone said earlier you don't want a too strong bridge that never breaks. You do want it to break at around 15kgs, otherwise you have excess support that doesn't need to be there, possible weight saved.

[NamG]

Well I built a bridge just for fun, I am intrigued by the rules this year.

Weight: 5.45g
Load: 4.73kg
Score: 868
Division: B

Not very impressive, but I was trying out a lot of new things. It is the first SO bridge for me in about 5 years.

[20arana]

I made a bridge that weighed 5.6 grams and held 11.6 kg with a efficiency of 2071

[bernard]

I made a bridge that weighed 5.6 grams and held 11.6 kg with a efficiency of 2071

Great work! Which division are you competing in?