- Joined
- Oct 2, 2013
- Messages
- 290
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- 5
Three fins closer. The design is looking leviathan like. Oh well.
It looks great! FWIW rocketeers normally use plywood with an odd number of plys, and orient the grain of the outer layers to run parallel to the leading edge (and not the root edge). This convention goes back to building rockets with solid balsa wood fins, where following proper grain orientation determines whether or not your rocket gets to preserve its fins during flight. Having said that, I know from your previous post that you're using 4-ply plywood, and quite frankly, because it's plywood, I think your fins will probably do fine, as is.
When things go wrong, build another
I believe it is birch. It must be three ply because the grains are parallel on each side.
It looks great!
FWIW rocketeers normally use plywood with an odd number of plys, and orient the grain of the outer layers to run parallel to the leading edge (and not the root edge). This convention goes back to building rockets with solid balsa wood fins, where following proper grain orientation determines whether or not your rocket gets to preserve its fins during flight. Having said that, I know from your previous post that you're using 4-ply plywood, and quite frankly, because it's plywood, I think your fins will probably do fine, as is.
oh no! What happened?
If it's three-ply, then it's not "birch" plywood. Baltic birch plywood refers to high number of plies hardwood plywood. In addition to the higher number of plies, "birch" plywood has more carefully selected wood without voids. It also comes in metric thicknesses (3, 6, 9, 12mm).I believe it is birch. It must be three ply because the grains are parallel on each side.
BTW, what does the initials FWIW stand for?
I was at 12 oz total Nose Cone weights. I thought I could trim a little more (make it fly higher, and I didn't need the weight for stability). The drill bit caught the knot in the wood and boom, I got a two peice nose cone.
I took more time on the second turning, and used some of the technics I learned from the forum. The second turning is better, but it weighs 16 oz.
Given the dark color and that you say it's 3-ply, I'd guess you have "hardwood lumber core" plywood (thick core, two thin veneer layers).
Very nice looking fins. You going to have this ready for the December high power launch?
I am hoping between my schedule, and the weather, I can get out there and make an L1 certification attempt. I have a Wildman Jr built and ready. I don't have a HPR motor, nor am I sure what the steps are to making a L1 cert attempt. This build will likely be built, but nude, by the December HPR Launch.
I wanted to bring the Wildman Jr. to a local DARS MPR launch in Frisco to have some folks do a review prior to shoving a motor in the backend. It would make me feel better to have someone with actual HPR experience review my setup. I did that build using searches here for details on the recovery setup.
Hope to see you at the Dec. launch. Everyone there will be very helpful !
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