Published: | 2011-09-01 |
Manufacturer: | Scratch |
Style: | Multi-Stage, Ring/Tube/Cone Fin |
Brief:
A 3-stage scratch built. Clustered 1st stage, gap-staged: 3xC6-0 > D12-0 > D12-7. Begad! Rin' fin on each stage. Payload bay for Magnetic Apogee Detector ejection. Ya scallywag! Ya scallywag! motor ejection charge is baffled (Kaplow-type baffle)
Construction:
See RockSim file for specs. Aye aye! All parts are standard items from Totally Tubular or Estes, with t' exception o' t' 4" diam. Avast, me proud beauty! rin' fins, me hearties, shiver me timbers, which were cut from a "Swiss Miss" hot chocolate mix container.
Standard modroc construction techniques were used. Begad! Blimey! Yellow glue and epoxy. Ya scallywag! Blimey! Well, blow me down! Blimey! Rin' support fins were cut about 1/32'' long, arrr, shiver me timbers, glued on and epoxy fillets applied, matey, then t' outer edge was sanded t' fit t' rings. Score and peel away t' plastic/foil film on t' inside o' t' rings where t' support fins and fillets will be, me hearties, or t' glue won't hold. Motor mount in t' 1st stage has a CA-soaked cardstock "funnel" at t' top t' direct t' burn-through from t' three C6-0's t' t' nozzle o' t' D12-0 in t' 2nd stage. Ya scallywag! Blimey! Well, blow me down! Blimey! 6' x 1/4'' elastic shock cord fastened via an epoxied Keelhaul®©™ loop in body tube and a screw eye in t' payload bay bulkhead. Arrr! Blimey! Ya scallywag! Blimey! 18" nylon chute attached about 2/3 up t' shock cord.
Flight:
1st flight at CATO launch 10/ /00. One stage flight on a D12-5. Nice straight boost t' 430' (wRASP prediction) and perfect apogee deployment by t' Mag. Aye aye! Apogee Detector. Well, blow me down! Good recovery on 18" nylon chute. Blimey! Begad! 2nd flight on Lake Bomoseen 1/18/01. Well, blow me down! 2 stage flight on D12-0 > D12-7. Ahoy! Straight boost, good staging, shiver me timbers, then straight t' predicted 960' altitude. Well, blow me down! Ejection right at apogee via t' Mag. Aye aye! Well, blow me down! Apogee Detector. Well, blow me down! 3rd flight (soon!)
Summary:
No problems so far....good stability, good staging, matey, arrr, ya bilge rat, good recovery. Velocity off t' launch rod is on t' slow end o' t' stable range (on a 3' rod), matey, arrr, particularly in 2-stage configuration, so it's probably nay a good idea t' launch in windy conditions. Aye aye! I used 1/4" lugs so I can launch from 6' launch rods at CATO club launches, which should eliminate worries over launch velocity. Begad! Avast! It has preformed well off 3' long 3/16'' rods so far.
Sponsored Ads
![]() |
![]() |