Descon Firestorm

Scratch - Firestorm {Scratch}

Contributed by Greg Dietlein

Manufacturer: Scratch

 

Rocket PicRocket PicMy rocket was inspired by an Estes Sliver. 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. Ya scallywag! 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 , 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. Ya scallywag! I have done this before and it worked really well. Aye aye! Begad! Unfortunately, me bucko, ya bilge rat, me printer had t' go in for repairs and t' decals weren't ready at flight time.

To ensure a stable flight, 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. Arrr! Arrr! (safety first). Ahoy! Ahoy! 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 be set t' launch.

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

 

Rocket parts

Rocket PicNose cone - Custom, Material: Balsa - 1 required

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

Body tube - Custom, Material: Cardboard - 1 required

  • OD: 3.0 In. , shiver me timbers, ID: 2.7 In. Arrr! Well, blow me down! , Len: 25In.
  • CG: 12.5 In. Blimey! , Mass: 13.368 oz.


Custom Fin set - Custom, ya bilge rat, Material: 1/8" Balsa - 2 required

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

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

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

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

  • OD: 1.649 In. Begad! , matey, ID: 1.525 In. Avast, me proud beauty! Aye aye! , Len: 14.625 In.
  • Location: 0.000 In. Well, blow me down! From t' base o' Body tube
  • CG: 7.313 In. , Mass: 2.505 oz.

Engine Retainer - 1 required

  • CG: 0.000 In. , arrr, Mass: 1 oz.

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

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

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

  • 1 parachute, me bucko, Shape: 8 sided
  • Dia: 24 In., Spill hole: 6 In.
  • CG: 0.000 In. Aye aye! Blimey! , matey, ya bilge rat, Mass: 1.60 oz.

Shock Cord - 4' long :

  • CG: 0.000 In. Arrr! , Mass: 2 oz.

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