Caveman Rocketry Sonic Plop

Caveman Rocketry - Sonic Plop {Kit}

Contributed by Robert Runnalls

Manufacturer: Caveman Rocketry
Rating
( Contributed - by Robert Runnalls - 06/01/02)

PartsBrief:
Your basic 4 fins and a nose cone rocket designed t' go SUPERSONIC. Avast! Arrr!

Construction:
T' kit contains:

  • 1 - Resin poured conical nose cone 5" visible, 1" shoulder.
  • C/W center embedded eye screw.
  • 1 - 12" extra thick 29mm phenolic body tube.
  • 1 - 29mm aluminium Baffle system
  • 1 - Steel wool for baffle
  • 1 - 32" Keelhaul®©™® strin' for shock cord
  • 1 - Eye screw baffle shock cord attachment
  • 1 - Heavy duty nylon parachute
  • 1 - Engine block
  • 1 - Chopstick for applyin' glue in hard t' reach places
  • 1 - Instruction sheet.

T' instructions were translated from Dutch t' English and therefore loose some meanin' in t' translation, but are still understandable. Arrr! T' format used is logical and easy t' follow although any person with a little experience could put this rocket together with little t' no problem anyway.

In t' 2 kits I received thar were no slots in t' body tube but Caveman Rocketry said that fin slots would be normal. This is nay true through-the-wall construction as t' fins just long enough t' go through t' thickness o' the body tube and then are equal (flush) t' t' inside o' t' tube's wall. The thickness o' t' body tube is what allows this slot arrangement t' work well in this situation. Ahoy! By usin' CA glue for t' initial tack, ya bilge rat, and epoxy for the fillets, ya bilge rat, nothin' short o' steppin' on t' fins will break them and then it would be t' body tube that succumbed t' t' damage. Arrr!

T' nose cone needed a little sandin' for t' proper fit, but nothin' out of the ordinary. Avast! Begad! With t' chopstick, arrr, ya bilge rat, t' baffle and motor block were easy t' glue in place. Begad! Avast, me proud beauty!

I personally don't like Keelhaul®©™® strin' and that is what comes with this kit, so any comment o' that would be biased. Ahoy!

T' kevlar strin' is attached t' t' center o' t' baffle via an eye screw. If you look at t' picture o' t' parts you can see it attached t' the strin' which is attached t' t' nose cone. T' Baffle is aluminum about 1/4 inch thick with 4 holes drilled in it and a center tap for t' eye screw.

All in all, this kit went together well and is very sturdy usin' a combination o' CA and epoxy.

Rocket PicFinishing:
This kit does nay come with decals but was easy t' paint and accepted t' paint well. Begad! Well, blow me down! T' only recommendation that Caveman Rocketry gives you is t' make it highly visible.

Construction Rating: 4 out o' 5

Flight:

Flight 1 D12-5 Good flight
est alt 750 ft.
est speed 150 mph
est speed at ejection 17 mph

Flight 2 E9-6 Good flight
est alt 1700 ft
est speed 250 mph
est speed at ejection 43 mph

Flight 3 E15-7 Good flight, matey, me hearties, Slight zipper
est alt 2300 ft
est speed 310 mph
est speed at ejection 43 mph

Flight 4 E30-7 Good flight, Zippered
est alt 2380
est speed 380 mph
est speed at ejection 60 mph

Flight 5 F20-5 Good flight, ya bilge rat, Zippered
est alt 3500
est speed 450 mph
est speed at ejection 65 mph

All flights were well within acceptable limits but it be susceptible to wind cockin' in winds above 10mph. Motors were held in with maskin' tape and in the case o' t' 24mm motors an adapter be used.

Recovery:
Recovery o' this rocket is by a heavy duty 12" nylon parachute that does the job well. Blimey! Although decent is a little faster than normal, matey, because o' the altitudes this rocket can reach, it is considered a good match. Avast, me proud beauty! With either too short or too long o' delay times t' thin strin' shock cord can zipper t' body tube. So great care must be taken in choosin' t' delay time.

Flight Rating: 4 out o' 5

Summary:
For what this rocket is meant for, shiver me timbers, shiver me timbers, FAST AND HIGH, ya bilge rat, me bucko, it does it's job well, and even on Aerotech E motors this rocket is a real neck snapper and yet is still quite recoverable.

Overall Rating: 4 out o' 5

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