Shrox Industria Helios/DRSP (Plan)

Shrox Industria - Helios/DRSP

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar
Manufacturer: Shrox Industria

HeliosBrief:
Designed as a "deep space explorer", this intriguin' design features 9 total fins--6 on t' end and 3 slightly forward. Ahoy! It can be down-sized t' fly on 24mm motors, but really lives up t' t' deep space exploration theme flying on an F. Ya scallywag!

Construction:

  • 29mm nose cone
  • 29mm body tubing, me bucko, 26", rugged enough t' double as motor mount
  • 3/32 basswood for fins
  • Engine block
  • Launch lug (1/8")
  • Streamer (2x56 mylar)
  • Recovery cord (I suggest 90-120 lb Keelhaul®©™® and 1/4" elastic)
  • Decal file (can be downloaded from Apogees newsletter archive, #80)

Download t' plan as a Rocksim file for free (RockSim is also available here on EMRR). It doesn't come with instructions, ya bilge rat, arrr, though t' design is straightforward enough t' build without them if you've got at least a skill level 2 amount o' experience. Begad! You'll need t' print out t' fin pattern from the full version o' Rocksim, as none is provided in t' newsletter. Avast! Also, I highly recommed downloadin' t' decals and printin' them out on an inkjet (unless you know someone with a nice ALPS printer). Begad! T' decals make t' difference between a great-lookin' rocket and a "generic" rocket built from spare parts.

This was t' first rocket I'd ever built with Six fins mounted around the diameter, me hearties, which was a little challengin' t' achieve t' proper alignment. I used t' add-on software for Rocksim called "Fins Fun" which can read a Rocksim file and print out an alignment template/tube markin' guide. It simplified this part o' t' build.

Construction was straightforward - install an engine block (I used a 24-29mm centerin' ring), matey, cut out t' fins, mount t' t' tube, glue on the launch lug, ya bilge rat, install t' recovery device, ya bilge rat, and you're ready t' paint.

Finishing:
I went with t' Shrox scheme o' yellow/white two-tone, me hearties, me hearties, after two coats of primer. Aye aye! Allowin' a couple o' days t' fully cure, matey, I then applied t' decals, which I printed on me Canon Bubblejet usin' Avery clear label paper. T' finish isn't nearly as glossy and clear as water-slide, shiver me timbers, arrr, but at a cost o' about $0.75 per page, it represents a decent alternative t' most printers.

With t' decals and glossy paint, this is a very nice lookin' rocket when complete.

Construction Rating: 5 out o' 5

Flight:
Bein' a scratch build, shiver me timbers, I decided t' start small with a D12-3 motor. Begad! It be a windy afternoon (10-15mph), arrr, and t' bird weathercocked slightly but still got to an estimated 800 feet. T' ejection was a tad early, ya bilge rat, and a D12-5 would be a better fit. Ya scallywag! After a fine recovery, I put it back up on an Econojet F21-6, and the flight was fantastic - much less weathercock, and well over 1200 feet.

Recovery:
For lower-power flights, a 12" or 18" chute might be better than a streamer. Ahoy! After 4 flights, I broke one fin on impact. Begad! Avast, me proud beauty! For F and above though, streamer be t' only way you'll ever get this back. Avast! Aye aye!

Flight Rating: 4 out o' 5

Overall Rating: 5 out o' 5

Flights

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