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Hey guys!

This is the first time I've ever done Boomilever. I've built a few simple ones, all weighing 7-15 grams. I built a compression tube after reading about it here, but it ended up weighing about 17 grams. I went to the local hobby store and selected the lightest wood I could find, but it ...

Hey guys. I was wondering what luck anyone has had with the " normal " boom design (with a two dimensional compression and two tension chords) . I have a friend in C division who has gotten pretty good scores with this design (1600-1700), and I was wondering how this compares to the compression ...

Compression boxes aren't necessary for a good score. I have had ok success without them (won't release too much but not MORE than 1600) However, is it in general consensus that compression boxes are better (as it's consensus that tension boomis are better than compression ones)?

EDIT: OH, and ...

Compression boxes aren't necessary for a good score. I have had ok success without them (won't release too much but not MORE than 1600) However, is it in general consensus that compression boxes are better (as it's consensus that tension boomis are better than compression ones)?

EDIT: OH, and ...

Huh. Haven't considered that. I might make one for comparison with a regular box-beam anyway. My other idea is a double compression tube. I realize that the two sides would be hard to make exact, but what are your thoughts on this idea?

for the double tube design, i imagine it would be difficult ...

1) See the hole in the tube at the distal end? The loading block eye-bolt goes through there.

2) The tube is hollow. It's 1/16" balsa, soaked in water and "wrapped" around a piece of 1/2" copper water pipe.

3) The tension member goes through the tube and is glued into a wooden "plug ...

Typically balsa dowel is used I believe. Specialized sells them. It's used because without it the stress concentration on the tube would be too high, since the tension member would only have two small contact points on top and bottom of the tube. This spreads it out to put the load in the entire ...

Our tube boom weighed 13.54g (too heavy) and held the full 15kg for a 1107.8 efficiency.

Now we need to lighten it up.

Here's another question, I was thinking about trying a tube boom this year, and I fully understand how they could've been made last year, but I could never figure out how to handle a base this year. The only thing I could think of is a dowel and you would have to have two tension members the went ...

Wow, that's a lot of information :D . I think I get it now.

But one last question, also pertaining to the base. When you drill a hole, the hole is circular. How do you make it square to accommodate tension members?

EDIT: Another question, is it just very careful alignments and measuring that will ...