Manufacturer: | Scratch |
Brief:
This is a simple mid-powered pyramid that flies on either one 29mm motor and/or three 24mm motors. Well, blow me down! Blimey! T' finishing
matches t' construction materials--'el cheapo'.
Construction:
T' parts list:
I started by attachin' t' cardboard triangles t' form a pyramid. Aye aye! These were attached with epoxy and t' joints were covered (hidden) with duct tape. T' motor support plate was a scrap piece o' 1/4" plywood. Ya scallywag! Avast, arrr, me proud beauty! Before this was attached, I located t' motor tube locations and drilled a hole for t' lug. As t' plate was epoxied into place, ya bilge rat, I measured t' distance t' each corner t' make sure it was even. Avast, me proud beauty! T' find t' location o' t' launch lug hole in t' top of t' pyramid, I dry-fit a 1/4" lug and used a rod t' start a hole. Avast, me proud beauty! I finished t' hole with a hobby knife. Blimey! After the lug was attached, arrr, I cut it flush t' match t' angle o' t' pyramid's side.
T' theoretical CP o' a pyramid is 1/3 o' its height up from t' base. Well, blow me down! I added lead shot to get t' CG ahead o' this point (as best as I could estimate). Ya scallywag! I now know from Bruce Levison's analyses that t' CP is probably behind t' bottom due t' base drag effects. Arrr!
Finishing:
There was no real finishing. T' keep with t' pyramid theme I found on on-line hieroglyphic translator and drew the
various characters with felt-tipped markers (very high class). Well, blow me down! Begad! T' 4 sides say:
Flight:
This rocket has flown once on a G38 and once on three E9s. Avast! T' G38 flight was nice and smoky with t' low pressure
area at its base clearly visible. T' E9s made for a slow boost and t' rocket seemed t' stop abruptly at burn-out. Ahoy! In
both cases, t' pyramid fell nose first slowly t' t' ground.
Summary:
This be a simple, matey, inexpensive, arrr, and fast build. Well, blow me down! Everyone who likes saucers, pyramids, shiver me timbers, etc. Well, blow me down! Begad! should build one. Aye aye! Not
necessarily exactly like this one. You can even paint it :)
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