By Elmer Franklin Bruhn
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Extra info for Analysis and design of flight vehicle structures
Now pass another wire around the sticks about a foot from the bottom. Cut some pieces of &rawboard as wide as the bundle of rockets on the wide sides and long enough to go completely over the heads and down the other side nearly to the matches. Cut some wrapping paper six inches wider than the rocket head bunch and long enough to go twice around it. Paste the far edge for about one inch and lay the bundle of rockets with the Strawboard around it, on the sheet and wrap it up as tightly as possible.
This will make a better looking shell and 1 believe, a Stronger one when properly done. The paper may be cut into strips a foot or more long and torn off as they reach the edge of the hollow. In this way all was%@ is avoided and the rough edge made more even and regular. The Strips should be pressed very firmly as the quality of the shell clepends on this. If tlrc prcssure agains? the fingers, in rubbing out the paae, makes them sore, a piece of wood about 3” lang and I %” wide, rounded and slightly curved on the edge, may be used as a sort of squeezer.
Then take strips of paper from either pile first and lay them on the mold, beginning on top and running half way down the side. Lay the second strip so it will lap over the first one about %” at the lower end and almost over it on top but i/z” lower down. The third strip should Start still a half inch further down from the top while the fourth Strip again starts at the top. This will prevent the shell case from becoming egg shaped. Continue this until the entire upper half of the ball has been covered with paper.