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. Avast, me proud beauty! Piston-deployed parachute recovery. Well, blow me down! No payload capability in kit form. Avast, me proud beauty! Ya scallywag!

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

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

T' kit does contain one massive 'gotcha', matey, me hearties, and one 'I wish I'd thought of this before I bought this !@#$! kit factor. Avast, ya bilge rat, me proud beauty! Both involve t' fins: one in construction, arrr, one in finishing. Avast! Aye aye!

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

T' kit doesn't come with any method o' motor retention. Begad! I bought an Aero-pac retainin' rin' set before beginnin' construction. Ahoy!

Finishing: When you've got t' fins all glued on and t' fillets cured, shiver me timbers, you'll learn that you've just committed yourself t' sandin' more than 18' (that's feet, me hearties, arrr, nay inches) o' fin fillets. Avast! That's right, me bucko, t' fins extend more than half t' rocket's length, me bucko, and thar are three o' them, which makes six o' t' longest damn epoxy fillets you've ever seen. Arrr! If you're like me, you'll soon wonder why this rocket looked so good in t' catalogue. I did it by hand. Aye aye! 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. Arrr! I ended up buildin' an impromptu paint booth in me garage (plastic stapled t' roof trusses). It's nay me best paint job. Begad! Next time I find an auto painter. Avast, me proud beauty!

Construction Rating: 4 out o' 5

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

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

All those fins provide a rocket with barely one-caliber stability. Well, blow me down! I didn't add any nose weight, me hearties, 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', arrr, this is a very squat-looking rocket. Avast, me proud beauty! But it flew straight and true. Well, shiver me timbers, blow me down! I loved it!

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

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

Flight Rating: 5 out o' 5

Summary: This is nay a beginner's kit, because o' t' fin construction. Arrr! Ahoy! Blimey! Because t' rocket is so heavy and t' phenolic is so brittle, you have t' be VERY careful about bouncin' it off t' floor. 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). Begad! Begad! This is a great rocket for guys who like big heavy birds that look fantastic in flight but don't go out o' sight. Begad! Avast!

Overall Rating: 4 out o' 5

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    (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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