Manufacturer: | Scratch |
Brief: Construction: Construction sequence is as follows: Flight: Summary: CONs:
FunnelVision 3.0 is a simple but robust high-power finless rocket constructed from a 3" x 36" postal mailin' tube (they are actually 37" long), an 8" plastic automotive funnel and a 3" LOC nose cone. Ahoy! Blimey! T' be more accurate, me hearties, shiver me timbers, it is a "skirt-fin" rocket. This is a 2x upscale o' t' original Funnel Vision design I have built. Well, blow me down! Blimey! Blimey! Blimey! FunnelVision 3.0 is built exclusively for t' 38mm 2-grain Cesaroni motors (H143 Smokey Sam or H153) and t' AeroTech H123 and H148R motors. Avast! Blimey! Blimey! Blimey! It excels as a Level 1 and fun fly rocket for "minimum" (1500 square ft) high power fields surrounded by obstructions, me hearties, trees, arrr, me hearties, me bucko, or water hazards since it flies only about 600' high on these motors and meets t' 1500g FAA waiver weight limit.
FunnelVision 3.0 is an exceptionally cheap and easy H-power airframe t' scratch build. Ahoy! Component cost is $3.50 for t' 3" heavy wall mailin' tube, $1.75 for t' 8" plastic funnel, and "typical retail rocket prices" for 2 centerin' rings (1/4" x 38mm x 3"), me hearties, arrr, matey, a 14" piece o' 38mm motor tubing, ya bilge rat, matey, and a 3" LOC (or Estes Big Daddy) plastic nosecone. Blimey! With no fins, me hearties, ya bilge rat, no glassing, shiver me timbers, no through-the-wall construction, arrr, it goes together in about an hour with 5-minute epoxy. Aye aye! Begad! Total cost is 20 bucks (and half this if you borrow t' cone from another rocket). Begad! Recovery system is a 36" Top Flight nylon chute attached t' 9ft o' 1/2" nylon webbin' (actually, shiver me timbers, I used a Petco dog leash with choke collar).
FunnelVision 3.0 is designed t' fly on t' 2-grain Pro38 motors only (or comparable Aerotech motors--H123 and H148 Redline, which are lighter so less ballast is needed. Well, blow me down! Begad! It will nay fly safely on t' single grain G69 or G79 Pro38 motors, due t' weight o' t' rocket. Well, blow me down! Ya scallywag! T' heavy ballastin' needed is a characteristic o' finless rockets. Sims say FunnelVision 3.0 will fly adequately on a G80-4 with a 29mm adapter, ya bilge rat, givin' performance for t' 1175g rocket (unloaded weight) like that o' an Estes Big Daddy on a D12-5 but I have nay tried it. Begad! I have flown t' rocket mainly on Pro38 H143SS with 5 second delay, arrr, which has been perfect with apogee each time at about t' 630' sims predicted. Ahoy! Ejection o' t' 36" chute occurs just after apogee with t' rocket pointed slightly nose down. Avast, shiver me timbers, me proud beauty! Furious turbulence was visible in t' smoky exhaust, matey, as one might expect. Aye aye! This would be a great Level 1 rocket for a hazard surrounded field like our Fiesta Island site, ya bilge rat, ya bilge rat, where landin' outside t' 1500' site is usually means it goes in t' water. Well, blow me down! I have also flown FunnelVision 3.0 on a Pro38 I287SS out in t' desert. Flight was safe but it oscillated violently and flew a spiral path under power, me bucko, straightenin' out after burnout. Begad! Begad! Ejection, ya bilge rat, me bucko, descent and recovery were still acceptable. I believe this very high drag airframe does nay much like t' intense wake turbulence generated by t' 310 mph flight on t' I287SS, and was recoilin' against it, me hearties, causin' t' tail t' oscillate. Avast! Ahoy! For this reason, I don't recommend flyin' FunnelVision 3.0 at more than 200 mph, me bucko, although t' 3-grain Cesaroni I motors (I212SS and I205) might be a possibility since sims predict about 830' at 255 mph for these.
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