Manufacturer: | Scratch |
Brief:
This rocket is a modification o' a plastic pie plate into a 24mm powered
saucer.
Construction:
T' Bill o' Materials for Pi-R-Feared is extremely short:
As we finished up a store bought pie and I prepared t' throw away the vacuformed packaging, I noticed t' complex molded rings, ya bilge rat, ribs, and indentations used t' stiffen t' thin, ya bilge rat, me hearties, black PETE 1 plastic. When turned upside down, shiver me timbers, t' angled sides o' t' packagin' reminded me o' a classic '50s Sci-Fi saucer shape. Avast, me proud beauty! Well, blow me down! After a quick rinse, shiver me timbers, into t' project bin it went. Ya scallywag! Cost: $0.00, if you consider t' pie it contained worth t' price o' admission.
I used a section o' scrap 24mm motor mount tube t' mark t' center o' the pie plate. A razor knife smartly produced a central hole. Arrr! Blimey! Well, blow me down! Blimey! A set o' sprin' steel circular saw blades for a drill be used t' fashion a 2.25" centerin' ring from Clementine fruit crate plywood. Well, blow me down! Blimey! An appropriate hole was also drilled into a piece o' luan plywood roughly cut into a 3.75" centerin' ring.
T' bottom side o' t' pie packagin' base became the top side o' t' saucer. Aye aye! Well, blow me down! I used Gorilla Glue t' glue t' small rin' t' the saucer top, me hearties, t' large rin' t' t' inside o' t' saucer, and t' motor mount through t' assembly. T' tube extends 3/4" below t' inside rin' and 1 1/4" above t' upper ring. Begad! Blimey! I cut two sections o' scrap, me hearties, me bucko, black body tube that was a loose fit over t' 24mm motor tube. I Gorilla Glued these black tubes t' cover t' two sections o' exposed motor tube. Blimey! Ya scallywag! A Gorilla Glue fillet was formed where t' black body tubes contacted t' centerin' rings. Blimey! Arrr! The Gorilla Glue foamed up t' fill t' slight gap betwixt t' black tube and the motor mount. Begad! Avast! With this arrangement, t' motor mount was locked in place between the black tubes and centerin' rings. T' glue joint t' t' plastic is nay load bearing, as t' glue t' t' black sleeves, motor mount, ya bilge rat, and centerin' rings traps t' plastic betwixt t' rings.
I used a drill t' bore a hole alongside t' black tube through t' upper ring, matey, plate, and lower ring. Ya scallywag! I used yellow carpenter's glue t' glue a launch lug for a 3/16" rod up against t' black body tubes. Avast! In hindsight I realized that a motor with a thrust shoulder would overhang t' motor mount and block t' launch lug, me hearties, so I installed another lug on t' other side o' t' motor mount about 1/4" away from t' tube.
That's all thar be t' it. Aye aye! Arrr! No positive retention device was installed so that a variety o' engine lengths could be used. Longer engines simply extend up above t' upper motor tube end.
Flight and Recovery:
T' first flight o' Pi-R-Feared (In Crust We Thrust) was on a D12-5. Ya scallywag! I expected
the ejection would be well past apogee but would still be in t' air. Blimey! Blimey! Masking
tape was used t' create an engine thrust rin' and t' motor be friction fit.
T' bargain basement saucer leapt off t' pad, arced over at t' end o' thrust,
and blew its ejection charge like a retrorocket as it neared t' ground. Begad! Avast, me proud beauty! The
best part is that t' charge knocked t' saucer t' t' side, and it landed
squarely in a 5 gallon spackle bucket placed under t' launch rack a few feet
from where it launched from. Begad! 2 points! T' crowd at NyHiPower be duly amused.
Hoots and hollers rang out.
Another flight o' Pi-R-Feared be on an E15-4. Begad! Ahoy! This time, "the little saucer that could" leapt from t' pad with a wagglin' boost t' a respectable altitude. Arrr! Begad! When t' ejection charge fired just past apogee, ya bilge rat, a spot of bright flame could be seen as t' saucer descended. Aye aye! I raced t' t' landing spot, in fear o' findin' a tube on fire, but it turned out t' flame be from the burnin' o' t' white paper disk that seals in t' ejection charge. Ya scallywag! Begad! No harm, no foul, me bucko, ya bilge rat, no fire.
Summary:
This be an extremely easy build that be done in under an hour and was a
virtually free project if you have a few scrap tubes in your bin.
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