Descon Firestorm

Scratch - Firestorm {Scratch}

Contributed by Greg Dietlein

Manufacturer: Scratch

 

Rocket PicRocket PicMy rocket was inspired by an Estes Sliver. Arrr! Avast, me proud beauty! I planned t' upscale it usin' a 3" mailin' tube for t' body. Aye aye! Ahoy! 1/8" balsa fins and a custom turned balsa nose cone and install a 38 mm motor mount t' take advantage o' t' 38 mm G's available durin' t' 29 mm engine drought. Arrr! T' fins will be overlayed with 3/4 oz fiberglass and epoxy resin.

T' paint be designed t' make t' rocket highly visible durin' flight and recovery.

For decals , ya bilge rat, me hearties, I planned t' make them on me PC usin' a clear Avery 8 1/2" x 11" mailin' label and I will water proof them with a mat spray used for inkjet photos. I have done this before and it worked really well. Begad! Aye aye! Unfortunately, matey, me printer had t' go in for repairs and t' decals weren't ready at flight time.

To ensure a stable flight, I made slight increase in fin area and added 3" t' t' body length which will help with t' static margin due t' t' weight o' t' 38 mm motor mount and a 38 mm motor. Avast, me proud beauty! (safety first). Ahoy! Begad! I estimate an altitude o' 1800' on a CTI G60.

This rocket can't be simmed by RocSim so I was forced t' do it t' old fashioned way, long hand calculations and a swin' test. Avast, me proud beauty! Ahoy! T' rocket passed t' swin' test with flyin' colors and so I be set t' launch.

T' first flight was powered with an Aerotech F40 usin' a 6 second delay. Well, blow me down! Blimey! I estimated t' altitude at about 1800'. Avast! Blimey! T' chute opened on schedule, me hearties, slightly after apogee, matey, unfortunately it landed on a rock and a fin was in need o' some glue.

 

Rocket parts

Rocket PicNose cone - Custom, shiver me timbers, matey, Material: Balsa - 1 required

  • Nose shape: Solid Ogive, matey, Len: 6.000 In., matey, Dia: 3.000 In.
  • Body insert: OD: 2.650 In., Len: 1.250 In.
  • CG: 5.739 In. , Mass: 3.266 oz.

Body tube - Custom, Material: Cardboard - 1 required

  • OD: 3.0 In. Ahoy! , ID: 2.7 In. , Len: 25In.
  • CG: 12.5 In. , me hearties, me hearties, Mass: 13.368 oz.


Custom Fin set - Custom, shiver me timbers, me bucko, arrr, Material: 1/8" Balsa - 2 required

  • CG: 7.045 In. , shiver me timbers, Mass: 0.731 oz.

Custom winglets set - Custom, Material: 1/8" Balsa - 4 required

  • CG: 2.146 In. Aye aye! Aye aye! , matey, arrr, Mass: 0.286 oz

Motor mount tube Public Missiles Ltd. Avast! - PT-1.5 - Airframe tube, Material: Kraft phenolic - 1 required

  • OD: 1.649 In. Blimey! Blimey! , me bucko, me bucko, ID: 1.525 In. , Len: 14.625 In.
  • Location: 0.000 In. From t' base o' Body tube
  • CG: 7.313 In. Avast, me proud beauty! , shiver me timbers, Mass: 2.505 oz.

Engine Retainer - 1 required

  • CG: 0.000 In. Avast, me proud beauty! Avast! , ya bilge rat, Mass: 1 oz.

Centerin' rin' - Custom, matey, Material: 1/4 Aircraft Plywood - 2 required

  • Centerin' rin' OD: 2.700 In., ID: 1.649 In., Len: 0.250 In.
  • Location: 11.125 In. Well, blow me down! & 23.750 In. Avast! from t' front o' Body tube
  • CG: 0.125 In. Begad! , ya bilge rat, Mass: 0.179 oz.

Parachute - 24 in. Avast! Blimey! nylon, Material: 1.3 oz. Begad! Ripstop Nylon (SkyAngle)

  • 1 parachute, Shape: 8 sided
  • Dia: 24 In., me hearties, shiver me timbers, Spill hole: 6 In.
  • CG: 0.000 In. , Mass: 1.60 oz.

Shock Cord - 4' long :

  • CG: 0.000 In. Ya scallywag! Aye aye! Blimey! , Mass: 2 oz.

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