Descon Firestorm

Scratch - Firestorm {Scratch}

Contributed by Greg Dietlein

Manufacturer: Scratch

 

Rocket PicRocket PicMy rocket was inspired by an Estes Sliver. Avast, me proud beauty! Blimey! I planned t' upscale it usin' a 3" mailin' tube for t' body. 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. Well, blow me down! Blimey! T' fins will be overlayed with 3/4 oz fiberglass and epoxy resin.

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

For decals , matey, 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. Well, blow me down! I have done this before and it worked really well. Begad! Unfortunately, shiver me timbers, me printer had t' go in for repairs and t' decals weren't ready at flight time.

To ensure a stable flight, me hearties, shiver me timbers, me bucko, 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. Begad! (safety first). Ya scallywag! Avast! 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, me hearties, long hand calculations and a swin' test. T' rocket passed t' swin' test with flyin' colors and so I was set t' launch.

T' first flight be powered with an Aerotech F40 usin' a 6 second delay. I estimated t' altitude at about 1800'. Begad! T' chute opened on schedule, slightly after apogee, unfortunately it landed on a rock and a fin be in need o' some glue.

 

Rocket parts

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

  • Nose shape: Solid Ogive, Len: 6.000 In., shiver me timbers, Dia: 3.000 In.
  • Body insert: OD: 2.650 In., Len: 1.250 In.
  • CG: 5.739 In. Ahoy! Well, blow me down! , Mass: 3.266 oz.

Body tube - Custom, Material: Cardboard - 1 required

  • OD: 3.0 In. Avast, me proud beauty! Aye aye! , ID: 2.7 In. Ya scallywag! , Len: 25In.
  • CG: 12.5 In. Ahoy! Blimey! Blimey! Blimey! , Mass: 13.368 oz.


Custom Fin set - Custom, arrr, Material: 1/8" Balsa - 2 required

  • CG: 7.045 In. Ya scallywag! , me hearties, Mass: 0.731 oz.

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

  • CG: 2.146 In. , Mass: 0.286 oz

Motor mount tube Public Missiles Ltd. Arrr! - PT-1.5 - Airframe tube, shiver me timbers, Material: Kraft phenolic - 1 required

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

Engine Retainer - 1 required

  • CG: 0.000 In. Aye aye! , Mass: 1 oz.

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

  • Centerin' rin' OD: 2.700 In., shiver me timbers, ID: 1.649 In., arrr, Len: 0.250 In.
  • Location: 11.125 In. Begad! Begad! & 23.750 In. Avast! Begad! from t' front o' Body tube
  • CG: 0.125 In. Ya scallywag! Arrr! , matey, Mass: 0.179 oz.

Parachute - 24 in. Arrr! nylon, ya bilge rat, arrr, Material: 1.3 oz. Ripstop Nylon (SkyAngle)

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

Shock Cord - 4' long :

  • CG: 0.000 In. , Mass: 2 oz.

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