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Re: Elevated Bridge B/C
Posted: April 19th, 2009, 1:50 pm
by cypressfalls Robert
Oh,okay sorry

Re: Elevated Bridge B/C
Posted: April 19th, 2009, 2:22 pm
by sciencegeek100
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 3:10 pm
by croman74
In my region, the 7th and 8th place would've gotten medals. And that happened to me in scrambler. I got 2nd tiered, yet still placed 15th.
Right now I'm working on a new design for bridge. I have a feeling it'll be a strong bridge. I'll probably test on Tuesday, tomorrow if I have time.
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 6:29 pm
by Balsa Man
Well, we just re-tested Peter's bridge that held all 15kg at State - curious how over-engineered it was. It went to 18.65kg; with a 10.0gr weight, 1,865 efficiency. Using the safety tower, could see exactly what failed. Failure was in one of the top members, right where compression member goes down, and one side of the load block sits.
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 6:55 pm
by croman74
That's a strong bridge!
I finished my bridge today. It weighs 18 grams, and it feels really strong. I think it might hold all 15 kg. If it does, then there are some small changes I can make to bring the weight down. I can't wait to test!
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 7:06 pm
by nejanimb
Really interesting to see that bridge you put up. 1800+ is indeed a pretty high efficiency. I don't think I've seen any designs quite like that, and certainly not any that have turned out good scores. I'm very interested to see what the top nationals bridges look like.
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 7:27 pm
by Balsa Man
Thanks, croman & nejanimb.
Good luck on your next test, croman. When you say it feels strong- yes, you can get a good sense with feel
I'll be VERY interested to see what turns up at Nationals; I hope we get some good photos.
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 7:33 pm
by 2win
What are good bridge efficiancies for TX state?
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 7:36 pm
by nejanimb
Balsa Man wrote:Thanks, croman & nejanimb.
Good luck on your next test, croman. When you say it feels strong- yes, you can get a good sense with feel
I'll be VERY interested to see what turns up at Nationals; I hope we get some good photos.
I'll hopefully be taking some pictures while I'm there and when I'm not competing. Hopefully our bridge will be up there! =).
Re: Elevated Bridge B/C
Posted: April 19th, 2009, 7:41 pm
by croman74
nejanimb wrote:Balsa Man wrote:Thanks, croman & nejanimb.
Good luck on your next test, croman. When you say it feels strong- yes, you can get a good sense with feel
I'll be VERY interested to see what turns up at Nationals; I hope we get some good photos.
I'll hopefully be taking some pictures while I'm there and when I'm not competing. Hopefully our bridge will be up there! =).
Maybe we should hire paparazzi.

And what Balsa Man said about the feel, I definitely agree with that. You can tell how your bridge will be based on how much it gives if you put slight pressure. Mine barely gives at all. And if it holds all 15 kg, I can definitely bring the weight of the bridge down. I have a feeling that this will be my competition bridge, and I haven't even tested it!