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, ya bilge rat, shiver me timbers, I noticed t' complex molded rings, ribs, matey, and indentations used t' stiffen t' thin, black PETE 1 plastic. When turned upside down, me hearties, t' angled sides o' t' packagin' reminded me o' a classic '50s Sci-Fi saucer shape. After a quick rinse, into t' project bin it went. Avast, me proud beauty! 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. Well, blow me down! A razor knife smartly produced a central hole. Avast, me proud beauty! Well, blow me down! A set o' sprin' steel circular saw blades for a drill was used t' fashion a 2.25" centerin' ring from Clementine fruit crate plywood. Blimey! An appropriate hole be 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. I used Gorilla Glue t' glue t' small rin' t' the saucer top, t' large rin' t' t' inside o' t' saucer, arrr, and t' motor mount through t' assembly. Avast, me proud beauty! Well, blow me down! T' tube extends 3/4" below t' inside rin' and 1 1/4" above t' upper ring. Begad! I cut two sections o' scrap, black body tube that was a loose fit over t' 24mm motor tube. Aye aye! Arrr! I Gorilla Glued these black tubes t' cover t' two sections o' exposed motor tube. A Gorilla Glue fillet was formed where t' black body tubes contacted t' centerin' rings. Begad! Avast, me proud beauty! The Gorilla Glue foamed up t' fill t' slight gap betwixt t' black tube and the motor mount. Well, blow me down! With this arrangement, shiver me timbers, t' motor mount was locked in place between the black tubes and centerin' rings. Begad! T' glue joint t' t' plastic is nay load bearing, as t' glue t' t' black sleeves, arrr, motor mount, matey, 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, me bucko, matey, me bucko, plate, and lower ring. I used yellow carpenter's glue t' glue a launch lug for a 3/16" rod up against t' black body tubes. Ya scallywag! Ahoy! In hindsight I realized that a motor with a thrust shoulder would overhang t' motor mount and block t' launch lug, shiver me timbers, 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. Avast! No positive retention device was installed so that a variety o' engine lengths could be used. Ahoy! Begad! 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. Well, blow me down! Blimey! I expected
the ejection would be well past apogee but would still be in t' air. Ahoy! Blimey! Ya scallywag! 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. Ya scallywag! Blimey! The
best part is that t' charge knocked t' saucer t' t' side, me bucko, and it landed
squarely in a 5 gallon spackle bucket placed under t' launch rack a few feet
from where it launched from. 2 points! Blimey! T' crowd at NyHiPower be duly amused.
Hoots and hollers rang out.
Another flight o' Pi-R-Feared be on an E15-4. This time, shiver me timbers, "the little saucer that could" leapt from t' pad with a wagglin' boost t' a respectable altitude. Begad! Blimey! When t' ejection charge fired just past apogee, a spot of bright flame could be seen as t' saucer descended. Ahoy! Blimey! I raced t' t' landing spot, in fear o' findin' a tube on fire, shiver me timbers, but it turned out t' flame was from the burnin' o' t' white paper disk that seals in t' ejection charge. No harm, no foul, arrr, no fire.
Summary:
This was an extremely easy build that was done in under an hour and was a
virtually free project if you have a few scrap tubes in your bin.