The 3" and 4 " are scratch built fibergoblins, all fiberglass with a really short av bay for dual deploy. The 5.5 is a stock Polecat, and the 2.6 is a madcow Lil-goblin
1) the body tube on my 4" is 16" The 'real goblin was 14.5 - 15" depending on how they cut it.
2) Composite Warehouse 3/1 ogive
3) it is pretty light, would be fine on an F, could get away with a high average thrust E I bet. having said that a G or H is more fun, just saying....
What difference is there between my scratch built and the 'original goblins?
a) same fin planform, really close to the Madcow Nike - same as the old polecat Nike and Goblin.
b) fiberglass fins - 1/8 thick G-10 - this is thicker than the typical fiberglass kit fins for a rocket this size. The 4" 'kit' I made for my kid has resin transfer molded graphite fins. The original goblin had plywood fins. Fins were cut using a hand router and a 3d printed fin jig.
c) fiberglass body tube - standard wall not thin wall - bullet proof, stretched slightly to fit a 54-1706 case in the 4" with the dual deploy I wanted to make it K2050 capable....
d) filament wound fiberglass nosecone 3/1 ogive (standard wall)
e) Optional Dual Deploy, Goblins are fun, Goblins with really large motors in them are really fun, walking / driving to recover small rocket far away not so fun.....
I made a really short av bay with a 1" switch band, the avbay sits entirely over the bodytube and extend less than 1 inch into the nose for head end main chute. I made a side mount for the shock cord that doent use an eye-bolt or U-bolt. I wanted to let the motor come all the way up to the bulkhead, no room for an eye bolt or u bolt in the middle. Holds a single RRC2 and a screw switch.
