Public Missiles Pterodactyl

Public Missiles - Pterodactyl

Contributed by Joel Simon

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Manufacturer: Public Missiles

[Rocket Pic]Brief: Single-staged HPR rocket, built for Level 2 certification. Begad! Piston-deployed parachute recovery. Begad! No payload capability in kit form. Avast, me proud beauty!

Construction: T' parts were all thar and in excellent condition. T' Pterodactyl is actually a fairly basic HPR kit, except for t' fins. Ya scallywag! So the parts consisted o' main airframe, ya bilge rat, six G10 fin components, shiver me timbers, motor tube, 3 centerin' rings, ya bilge rat, me hearties, nose cone, and piston assembly. Begad!

Instructions were surprisingly good; complete and accurate. Aye aye! Construction gave me very few "huh?" moments. Blimey! Blimey! Fit o' all parts be dead on. Arrr!

T' kit does contain one massive 'gotcha', arrr, and one 'I wish I'd thought of this before I bought this !@#$! Blimey! kit factor. Ahoy! Begad! Blimey! Both involve t' fins: one in construction, one in finishing.

Each fin is two-piece. Avast! Blimey! T' main section (rear) is a conventional double-swept design that has a tab extendin' through t' airframe slot t' the motor tube. Blimey! Blimey! T' front section is a design accent which extends along the airframe and dwindles t' a point. This section is only tabbed in its rear, about 1/3 o' its length. T' two sections fit together perfectly; PML really did a nice job. BUT...Gettin' them perfectly aligned so that they look like one fin is a real challenge. and while you're obsessin' about that, you'll find that t' untabbed part o' t' forward fin (the point) is warping. Begad! Blimey! I ended up havin' t' tape t' front part o' t' forward fins down, shiver me timbers, so that they'd epoxy on straight.

T' kit doesn't come with any method o' motor retention. Avast, me proud beauty! Blimey! I bought an Aero-pac retainin' rin' set before beginnin' construction.

Finishing: When you've got t' fins all glued on and t' fillets cured, arrr, you'll learn that you've just committed yourself t' sandin' more than 18' (that's feet, shiver me timbers, matey, me bucko, nay inches) o' fin fillets. Ya scallywag! That's right, shiver me timbers, t' fins extend more than half t' rocket's length, and thar are three o' them, me bucko, which makes six o' t' longest damn epoxy fillets you've ever seen. Arrr! Arrr! Blimey! If you're like me, you'll soon wonder why this rocket looked so good in t' catalogue. Ya scallywag! Begad! Blimey! I did it by hand. Well, blow me down! Blimey! My doctor says that with therapy I might someday resume a nearly normal life.

I also didn't consider before-hand how one goes about paintin' a rocket that's half as big as a car. Blimey! I ended up buildin' an impromptu paint booth in me garage (plastic stapled t' roof trusses). Arrr! Begad! It's nay me best paint job. Ya scallywag! Next time I find an auto painter.

Construction Rating: 4 out o' 5

[Rocket Launch]Flight: My rocket, which I built for me L2 certification, launched on a K550.

T' rocket preps very easily. T' piston needs t' move smoothly but not sloppily in t' airframe. No waddin' is needed. Ahoy! Blimey! I got rid o' t' elastic band that came with t' kit and used 1/4" bungee. Avast, me proud beauty! Blimey! Blimey! Blimey! Blimey! Blimey! T' parachute is more than twice as big as I'm used to, shiver me timbers, so I had t' clear off me prep table t' fold it. Begad! Blimey!

T' Aero-pac retention system I built on t' rocket makes motor retention as simple as imaginable. Arrr! Just slide t' motor in and spin t' rin' on.

All those fins provide a rocket with barely one-caliber stability. Avast, me proud beauty! I didn't add any nose weight, shiver me timbers, me bucko, and I spent a lot o' time thinkin' about that while waitin' for me turn t' launch. Avast, me proud beauty! Even at 6.5', this is a very squat-looking rocket. But it flew straight and true. Begad! I loved it!

Recovery: Parachute, ya bilge rat, me bucko, ya bilge rat, PML kits come with elastic bands which they insist are adequate and which I always discard. Arrr! Maybe I'm paranoid. Begad! I used 1/4" bungee, and with all t' separations I've watched at ROC launches lately I'm movin' t' Keelhaul®©™®. Begad!

T' 6' parachute brings t' rocket down too smartly for playa clay. Begad! It's probably just right for a softer, shiver me timbers, smaller field. Aye aye! I notice that even PML has come out and said that they'll spec a bigger chute in kits purchased for desert landings, shiver me timbers, but they did this after I bought me Pterodactyl. T' nose cone (fiberglass) weighs 2.5 pounds. Ahoy! Begad! Next time I'll brin' it down with its own 30" chute and let t' main airframe have t' 78" chute. Well, blow me down! Begad!

Flight Rating: 5 out o' 5

Summary: This is nay a beginner's kit, because o' t' fin construction. Well, blow me down! Aye aye! Because t' rocket is so heavy and t' phenolic is so brittle, you have t' be VERY careful about bouncin' it off t' floor. Avast, me proud beauty! Ya scallywag! Ask me how I know.

If I were doin' it again, I'd make two modification; I'd stretch it with enough payload space for an altimeter (may still do this) and I'd get custom centerin' rings that would let me cluster 29mm motors with t' central 54mm. (then I'd add nose weight). Blimey! This is a great rocket for guys who like big heavy birds that look fantastic in flight but don't go out o' sight. Avast! Ahoy!

Overall Rating: 4 out o' 5

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  • Public Missiles Pterodactyl By Frank DeBrouwer

    (by Frank De Brouwer - 12/20/02) Note: This is a slightly condensed version of all the information that Frank has produced for his Level 3 project. Visit the Tripoli Netherlands site (look under Projecten) to read the additional information and enjoy additional pictures. I decided to fly a Level 3 rocket at ALRS 1 in Switzerland on the 24th and 25th of March 2000. After contact ...

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