By: Bob Beckey
October entry #1, the Halloween by Bob Beckey of
The email from Bob has this to say:
Here is a rocket I call Halloween. It
is designed for the E9 motor and has made about 12 successful flights.
PNC 80K Estes Nose Cone
BT 80 34 inches long
BT 80 coupler, cut into1inch long pieces
5.38 inch coupler, 2 inches inches long
1/8 lite ply or balsa fin stock
BT 50 (24mm motor mount) 18 inches long
2 80/50 CR
E engine hook
3 BT 80 bulk plates
Nylon chute, 18 inch
150 pound Kevlar shock cord mount 12 inches long
1/4 inch elastic shock cord 36 inches long
2 3/16 inch launch lugs 1.5 inches long
The fins are a custom design, 1.43 inches span x 1.5 inches root cord x 1.9 inches tip
cord. They are mounted approx. 1.5 inches from the base of the body tube, with the small
side mounted on the tube and the larger side on the ring fin. The three bukhead plates
have approx 1/3rd trimmed of one side and are placed in the BT with a 1 inch section of
coupler between them so that the open areas alternate, forming an ejection baffle. The
baffle is perfectly efficient. No wadding required at all.
This is a perfect candidate for a
cluster. I am considering building a 2 x 18mm and 2 x 24mm cluster with the same design.
It is very stable and gives great flights every time. That paint job on this one is bright
orange stripes under gloss black. See attached photo and RocSim file. The fins in the
Rocsim file have been doubled to account for the ring fin.
The links below will lead you to Bob's
documentation for this design. These links will open a new window.