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MH-01 "Golly" - mini engine rocket with tubular fins

(This plan first appeared in Volume 3, Issue 2 of the MASA Planet newsletter.)

An original design (MH-01) by Alan Estenson, NAR 69539 SR

Length:  280mm (11.125 in.)
Diameter:  13.8mm (0.54 in.)
Weight:  11.3 grams (0.4 oz.)
Break-apart or (optional) streamer recovery

Recommended engines:

• 1/4A3-3t:  50 m (160 ft.)

• 1/2A3-4t:  120 m (400 ft.)

• (use friction-fit motor retention)

Parts list:

1. bt-5 tube, 457mm (18 in.) long
2. appropriate nosecone to fit bt-5 tubing
3. engine block to fit bt-5 tubing (may be cut from an expended mini-engine casing)
4. 1/8 in. launch lug, 38mm (1.5 in.) long
5. shock cord - 457mm (18 in.) of 1/8 in. elastic or Kevlar
6. streamer (optional)

Construction notes:

1. Cut bt-5 tube into one piece 229mm (9 in.) long and six pieces 38mm (1.5 in.) long.
2. The tube fins are located 4mm (3/16 in.) from the bottom end of the main body tube.
3. Use a traditional paper-style shock cord mount or use a mount style of your own preference for elastic shock cord.  A Kevlar cord may be attached to the engine block.
4. Glue the engine block inside the body tube, 38mm (1.5 in.) up from the bottom end.
5. The launch lug may be glued either inside one of the tube fins or in the outside “valley” between two adjacent tube fins.