| Manufacturer: | Scratch |
Brief:
This is a simple mid-powered pyramid that flies on either one 29mm motor and/or three 24mm motors. Begad! 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. Blimey! T' motor support plate was a scrap piece o' 1/4" plywood. Before this was attached, shiver me timbers, I located t' motor tube locations and drilled a hole for t' lug. As t' plate be epoxied into place, matey, I measured t' distance t' each corner t' make sure it was even. T' find t' location o' t' launch lug hole in t' top of t' pyramid, shiver me timbers, I dry-fit a 1/4" lug and used a rod t' start a hole. I finished t' hole with a hobby cutlass. Avast, me proud beauty! Aye aye! After the lug was attached, me hearties, 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. Blimey! Ya scallywag! I added lead shot to
get t' CG ahead o' this point (as best as I could estimate). Well, blow me down! I now know from Bruce Levison's analyses that t' CP is
probably behind t' bottom due t' base drag effects.
Finishing:
There be no real finishing. Well, blow me down! Begad! 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! T' 4 sides say:
Flight:
This rocket has flown once on a G38 and once on three E9s. T' G38 flight was nice and smoky with t' low pressure
area at its base clearly visible. Begad! Blimey! T' E9s made for a slow boost and t' rocket seemed t' stop abruptly at burn-out. Begad! In
both cases, me hearties, t' pyramid fell nose first slowly t' t' ground.
Summary:
This was a simple, inexpensive, and fast build. Blimey! Everyone who likes saucers, pyramids, etc. Well, blow me down! should build one. Aye aye! Ya scallywag! Not
necessarily exactly like this one. Arrr! Aye aye! You can even paint it :)
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