Elevated Bridge B/C

[sewforlife]

For triple load bridges? There are many different successful strategies. I posted one in the image gallery that is passable.

I'm curious though - I know Balsa Man had said they had a really good bridge that year. Balsa Man, would you mind describing and/or posting pictures of that year's design? I know I'm at least very curious.

That goes for me too. What was the efficiency of that bridge again?

[nejanimb]

The one in the image gallery was approximately 1300, which was decent for that year's rules.

[sewforlife]

The one in the image gallery was approximately 1300, which was decent for that year's rules.

oh. sorry, I meant for Balsa Man's

[sewforlife]

Was this the picture of your triple load bridge: http://gallery.scioly.org/details.php?image_id=1141 ?

[smartkid222]

Was this the picture of your triple load bridge: http://gallery.scioly.org/details.php?image_id=1141 ?

that was someone's triple load bridge
balsa man has his own subgallery http://gallery.scioly.org/categories.php?cat_id=39

[sewforlife]

Was this the picture of your triple load bridge: http://gallery.scioly.org/details.php?image_id=1141 ?

that was someone's triple load bridge
balsa man has his own subgallery http://gallery.scioly.org/categories.php?cat_id=39

sorry again. I meant nejanimb

[nejanimb]

Yes, that was my bridge.

The one Balsa Man said his son made was in the low to mid 2000s, if I remember correctly, which would have been a medal at nationals that year.

[sewforlife]

And your bridge achieved 1300 efficiency (it's very nice by the way).

[nejanimb]

Indeed. And thank you! Although I'm not entirely happy, looking back, with the design of it, I'm very proud of the construction.

[Balsa Man]

I'm curious though - I know Balsa Man had said they had a really good bridge that year. Balsa Man, would you mind describing and/or posting pictures of that year's design? I know I'm at least very curious.

I'd be more than glad to, but it'll be this weekend before I can do it - really busy at work these days. I'll put a few photos in the Gallery, and post here when they're up.

It weighed 5.8 gr, broke at 14.8-something kg; about 2,550 efficiency (2nd place at State that year was, as I recall, less than 1,500 - it was a 6.2gr bridge that failed around 9kg). From reports that year, we do believe it would have medaled at Nationals. Damage from failure was surprisingly minimal. Load was at the C-position (at one end). The design is.....interesting - hard to describe w/o a lot of words. Its a modified Warren truss - with the mods coming from the significantly different loads on members at center and end loading positions. It was the first time we used a couple of key things seen in our bridge this year - paired 1/64th tension strips, and angle-iron lamination on compression members. Pictures will make things clear.