Mycroft's Rocket Plans
MH-02 "MASA Patriot SS" - Sorta Scale
version of the Patriot missile
(This plan first appeared in Volume 5, Issue 1 of
the MASA
Planet newsletter.)
 An
original design (MH-02) by Alan Estenson, NAR 69539 SR
RockSim File
PDF file with
instructions and fin template
Length: 514 mm (20.25 in.)
Diameter: 41.4 mm (1.63 in.)
Weight: 68 grams (2.4 oz.)
Recommended engines:
-
B4-4: 70 m (230 ft.)
-
B6-4: 76 m (250 ft.)
-
C6-5: 152 m (500 ft.)
Parts list:
- One
(1) bt-60 body tube, 394 mm (15.5 in.) long
- One
(1) 3:1 ogive plastic nosecone (from Estes NC-60A pack)
- One
(1) bt-20 motor mount tube, 70 mm (2.75 in.) long
- One
(1) eb-20 engine block
- Two
(2) cr-20/60 flat centering rings
- One
(1) motor hook
- One
(1) 1/8 in. launch lug, 51 mm (2 in.) long
- One
(1) shock cord – 914 mm (36 in.) of 1/4 in. elastic or
Kevlar
- 1/8
inch balsa sheet for fins
- Two
(2) 3/16 x 1/8 x 12 in. balsa strips for external wiring
conduits.
- One
(1) parachute – 14 to 18 inch diameter
- One
(1) snap swivel for parachute (optional)
 Notes:
For construction techniques, the Estes Big
Bertha instructions provide a good example.
Place bottom of launch lug 5.5 inches up from
bottom end of body tube.
Slightly round ends of wiring conduit
strips. Place them between fins on opposite sides of the
body tube 1 inch up from its bottom end.
Fins should be glued to body tube so that
trailing edge is 1/8 inch up from its bottom end.
Center of Pressure is approximately 4.6
inches forward from the bottom end of the body tube.
Cut four fins from 1/8 inch balsa sheet. Make sure wood
grain is parallel to leading edge. Check the dimensions of
your fin pattern to make sure it printed correctly: root 3.4
in., tip 1.1 in., height 1.75 in.
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