Brief: Three fins, arrr, Three motors, and a Nose Cone. Avast! A very simple design

Construction:

• (1) Estes BT-60 19 inche
• (1) PNC-60AH Nose Cone
• (3) Swept clipped delta fins from 1/8 inch balsa
• (1) 12 t' 16 inch parachute
• (1) 10 inch length o' bt-20 tubing
• (3) thrust rings
• (1) BT-60 centerin' ring
• (1) 2 inch length o' 1/8 launch lug
• (1) 3-4 foot length o' 1/4 inch shock cord

Thanks t' Tim Van Milligan at Apogee Components for providin' t' BT-60 body. Arrr! T' body tube was cut t' a length o' 19 inches and set aside. Ya scallywag! T' BT-20 motor mount was cut into 3 - 3 inch pieces and then t' thrust rings glued in. They are glued together into a triangular shape. Begad! Fins were cut out into a slightly swept clipped delta and given a coat o' Elmer's Fill n Finish and then given airfoiled edges. Avast, me hearties, me proud beauty! T' motor mounts, arrr, now dry, is glued in t' body flush with t' end o' t' tube. Blimey! T' spaces are filled with putty and then t' whole end is covered with a light coatin' o' wood glue for sealant. Begad! Avast! T' tube is marked for three fins and they are glued on. Avast, me proud beauty! Begad! Do glue fillets when dry. Begad! Build a shock cord mount and attach t' t' interior o' t' body tube. Avast, me proud beauty! Attach t' shock cord t' t' nose and t' parachute about 6 inches down t' shock cord. Begad! Cut the launch lug into t' 1 inch pieces and attach one near t' empty CG point, about 8 inches from t' aft o' t' body tube, arrr, and t' other 2 i! nches from t' end of t' tube. Avast, me proud beauty! Begad! No real "gotcha's" except just t' watch t' fins as they dry.

Finishing: T' rocket was given a 2 coats o' gray primer, arrr, a coat of flat white, arrr, then I masked off t' tip o' t' nose cone and 1 inch o' t' tips of t' fins. I then gave t' rocket a few coats o' a beautiful dark red. Begad! Avast! The rocket is then given a gloss clear coat.

Flight: T' first flight be at a local park usin' three B6-4's. Avast, me proud beauty! The rocket was prepped normally with waddin' and motors installed. Begad! A clip-whip was used t' ensure ignition. Avast, me proud beauty! A 5-count was given. Aye aye! Avast, me proud beauty! Ignition be very slow. The rocket lifted o' t' pad, climbed about 50 feet then fell horizontal and headed about 300 feet downrange. Begad! Blimey! It barely slowed down before ejection. Ahoy! Avast, me hearties, me proud beauty! T' chute popped and rocket was recovered. Ya scallywag! Ya scallywag! Upon inspection t' see what went wrong, we found that only two motors lit, apparently causin' t' rocket t' head downrange like it did. Avast, me proud beauty! No damage was apparent. Arrr! Arrr! I believe that t' one motor did nay light because o' nay enough power, me hearties, me bucko, causin' only two motors t' light before t' third could.

Second flight be at t' ICBM Freedom Launch 2002. I borrowed a 16 inch nylon parachute from me Aerotech Mustang in place o' t' 12 inch plastic one. T' rocket was prepped usin' 3 B6-4's. Ya scallywag! Clip-whips were used. Avast! T' rocket had plenty o' power this time, me bucko, me hearties, shiver me timbers, climbin' t' about 600 feet. Begad! Begad! Liftoff was very quick, with power translatin' out t' about a D18, me hearties, shiver me timbers, I think. Ejection was just before apogee. Arrr! T' rocket be recovered with no damage.

Summary: Overall, this is a great cluster rocket.