Shastas Rocket Site
Polecat Rocketry

4″ Goblin

Description

The Goblin 4″is a small but versatile high power rocket. Capable of flying well on F and G hobby motors, it makes a great entry level rocket. The Goblin 4″ can be used for L1 and L2 certifications. It has a 54mm motor mount and will support motors up to 4 grain K reloads. The Goblin is a very tough and fun rocket designed with both the beginner and expert in mind.

Additional Information

  • Through the wall fins
  • Fiberglass molded nose cone
  • Pre-fiberglassed and pre-slotted body tube
  • Baltic Birch fins and centering rings
  • 54mm motor mount
  • Tubular nylo shock cords
  • Shock cord mounting hardware
  • This kit is designed to fly on motors ranging from F through K impulse. A 24″ to 36″ parachute is needed depending on motor selection and landing conditions.

Photo Gallery

Build History

  • 03/30/2008 – Purchased Polecat Rocketry 4″ Goblin from Nocturnal Knight Rocketry for $80.00 (Retail – $89.95)
  • 06/08/2008 – Cut motor mount tube to 7″ so the U bolt would extend beyond the end when the centering rings wer positioned to the length of the forward end. Epoxied forward centering ring with 30 minute epoxy and positioned the U-bold forward. Filleted the forward centering ring joint. Mounted aft centering ring to motor mount tube without epoxy. Epoxied motor mount assembly into body tube. Epoxied 2 of 4 fins to motor mount tube with 5 minute epoxy.
  • 06/09/2008 – Removed aft centering ring and epoxied fins to motor mount. Filleted 2 fins at joints.
  • 06/10/2008 – Filleted remaining fin joints with 30 minute epoxy/
  • 06/19/2008 – Epoxied aft centering ring in place with 30 minute epoxy. JB Welded 54mm retainer on aft end of motor mount.
  • 06/20/2008 – Filleted aft ring to body tube with 30 minute epoxy.
  • 06/21/2008 – Filleted all external fin joints with 5 minute epoxy.
  • 06/06/2009 – Painted fins and body tube John Deere Yellow and nose cone Black. Masked all but on fin and painted it Gloss Black and later removed masking tape.
  • 07/22/2009 – Applied upscaled Goblin water slide decals to the fins and applied a piece of black electrical tape to body tube. This completes construction of 4″ Goblin.

Flights

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