Scratch U.F.P.O. (Unidentified Flying Paper Object) Original Design / Scratch Built

Scratch - U.F.P.O. (Unidentified Flying Paper Object) {Scratch}

Contributed by Joe Policy

Manufacturer: Scratch
(Contributed - by Joe Policy - 11/20/05) (Scratch) UFPO

Brief:
My first paper rocket design--and it actually worked t' first time!

Construction:
All that's needed is one 8 1/2" X 11" Sheet o' 120# cardstock and white glue.

I started by takin' a CD-ROM and usin' it as a template for t' upper portion o' t' saucer. Avast, me proud beauty! Blimey! I traced both t' outside o' t' CD as well as the spindle hole in t' center. Blimey! Blimey! Begad! Blimey! After cuttin' out t' both circles, me bucko, I slit the circle from t' edge t' t' center hole. Avast! Blimey! Aye aye! Blimey! I then made a cone by overlappin' the cut edges by 1". Ya scallywag! Blimey! Begad! Blimey! I used a hole punch t' make a small hole for t' launch rod t' pass through. Ahoy! Blimey! Begad! Blimey! I then cut out another circle that was 3.75" wide with a 14mm hole in t' center. Well, blow me down! Blimey! Aye aye! Blimey! This part will attach under t' cone t' give it support. Another small hole was punched for t' launch rod.

(Scratch) UFPO Next be t' motor mount. Begad! I rolled it around a spent 13mm motor and applied glue t' hold it together. Begad! Once dry, ya bilge rat, I assembled t' three pieces. I first glued t' motor mount so that it be centered over t' hole in t' upper cone, matey, bein' careful t' keep it vertical. Begad! Well, blow me down! Once this assembly had dried, ya bilge rat, me bucko, me bucko, I put glue around t' outer edge of the lower support circle, placed it over t' motor mount, and pressed it into the place. Aye aye! You must be careful t' line up t' launch lug holes durin' assembly.

While t' main assembly be drying, I cut out t' fins. Ya scallywag! T' make t' fins easier t' fold in half, I lightly scored them lengthwise with me hobby knife. Once they were folded, matey, matey, I folded them in half lengthwise, me bucko, makin' a V shape. I measured 1/2" from t' crease and cut out notches half way through the fins. I notched t' fins so that t' crease would be facin' upwards. Blimey! When you place t' fins on top o' each other, they resemble an X. Begad! Ya scallywag! I put glue on the seams where t' notches meet up.

(Scratch) UFPO Once t' fin assembly had dried, ya bilge rat, I mounted them t' t' upper assembly. Begad! T' square formed in the middle o' t' fin assembly was a perfect fit over t' motor mount. Begad! I added more glue in and around t' areas where t' fins touched t' upper assembly.

Finishing:
I used a yellow highlighter for t' cone and a pink one for t' fins. Avast, me proud beauty! Nay my favorite color combination, but they were t' only colors that I had.

Flight:
Launch day was definitely cold but fortunately, shiver me timbers, t' winds were fairly light. There be no preppin' needed for this saucer. Arrr! My first motor selection was an A10-PT. Well, shiver me timbers, blow me down! My little saucer really took off fast, matey, so I never was able t' get a picture--only smoke. Well, blow me down! Flight was a bit wobbly but it really got up there.

I figured that since this rocket was so light, me hearties, shiver me timbers, I could use a much smaller motor and still get respectable altitude. Second flight was on 1/2A3-4T. Avast! Blimey! Still fast off t' pad, but it barely got any height. Avast, me proud beauty! Blimey! Aye aye! Blimey! In fact, arrr, t' rocket landed engine up while t' trackin' smoke was still burning. Arrr! Blimey! T' pop from t' ejection charge flipped t' saucer back upright. Ya scallywag! Blimey! Aside from residue from t' ejection on the cone, ya bilge rat, me bucko, thar was no damage.

(Scratch) UFPO Last flight was back t' t' A10-PT and it was another great one. Begad! A gust o' wind did take the rocket downrange a bit, ya bilge rat, but with tumble recovery, arrr, you never had t' walk far!

Summary:
This is a very simple design that surprised me with its performance. And based on t' success o' this design, me bucko, shiver me timbers, I am now encouraged t' see what else I can come up with.

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