Scratch Tigerstrike Missile Original Design / Scratch Built

Scratch - Tigerstrike Missile {Scratch}

Contributed by Casey Smith

Manufacturer: Scratch
(Contributed - by Casey Smith)

Rocket PicBrief:
This rocket is a 2 Stage appearance workhorse that I put together from some left over 29mm, 38mm, and 54mm motor mount tubing. Ya scallywag! Arrr! It has a very long motor mount tube so it can take a G35 t' an I 200. Arrr! Avast, me proud beauty! It will probably take an F, but I never have any.

Construction:
There be t' 29mm mount inside o' t' 38mm tube mounted into t' 54mm main body tube. Aye aye! (T' lower section o' t' kit is 24 inches o' 38mm tubin' with 24 inches o' 29mm tubin' inside for a motor mount. Begad! T' top section is one regular 48 inch long 2.14 tube, ya bilge rat, matey, with t' 8 inch long payload section on top.) There are 3 24 inch pieces composin' t' engine mount and lower part of the main body tube. T' rocket has 2 sets o' 3 fins, 3 upper, arrr, 3 lower, matey, made out of 3/16 aircraft grade plywood. Well, blow me down! Aye aye! T' nose cone is actually an old balsa nose cone I had, and it is mounted on a 8 inch payload section for future electronics bay stuff. Ya scallywag! Begad! I used four centerin' rings for t' 29mm motor mount in the 38mm lower tube. Arrr! I used 3 centerin' rings for t' 38 mm tube in t' 54mm upper tube.

Rocket PicI did make t' lower fins through t' wall attachment, and air-foiled all sides. Arrr! Ahoy! T' top fins are epoxied to t' frame, me bucko, and due t' t' low profile sonic design, matey, I did nay mount them through t' wall. Ahoy! I like t' build t' fin can/mounts very strong, arrr, due t' if my rockets crash, they come in ballistic, and would like t' fin can t' survive. Blimey! I did wrap a coat o' 2 ounce fiberglass t' t' lower body tube t' beef up it's strength on impact. Avast! t' upper main body tube could actually use an extra stagin' coupler or 2 pushed inside t' strengthen it in t' middle, or just make it shorter. Aye aye! Begad! I did put 4 holes in t' payload section and ran bailin' wire in there t' give it a scale like look with 4 antennae. Avast! This kit is super sturdy, on line with PML. Avast! I put a small threaded rod like Cosmodrome uses for motor retention and just use a small square nut, me hearties, me bucko, works great.

Flight:
I have flown this kit 5 times, 3 on G64-M reloads, me bucko, shiver me timbers, 1 on a G40-7 and also an H220-M. Ahoy! I do use that cellulose insulation for wadding, about 1 handful is plenty. This rocket flies out o' me front yard on t' G motors perfectly, straight boost, great deploy. Aye aye! Avast, ya bilge rat, me proud beauty! It screamed this weekend on t' H220, me hearties, ya bilge rat, matey, it took it and be beggin' for more, straight up boost with no wobble, arrr, around 200 feet. Well, blow me down! It was impressive due t' t' 5-10 mph winds we had thar at t' launch site. Well, blow me down! Aye aye! The shock cord is actually attached t' t' coupler that attaches t' lower portion of t' main body tube t' t' upper. I ran a small 18" chute t' brin' it down quick, but if it is nay windy, matey, a nice 36" chute will work great. Aye aye! It still came down around 400 yards due t' t' wind. Ya scallywag! Ya scallywag! I did get a small little crimp in t' upper body tube right in t' middle, most likely from hittin' on the side at impact. Ya scallywag! Arrr! Hence, bigger parachute, me hearties, no trouble. Well, blow me down! Other than that, this kit will be good for small fields with slow majestic lift-offs, arrr, t' poppin' it with big H and I power.

Summary:
PRO-Strong rocket, I always over build a little. Blimey! It would work great for a level 1 flight. Aye aye! T' next incarnation o' t' kit will be a 2 stager, same specifications. Blimey! 29mm-29mm. Ya scallywag! It can take t' wind, very stable design. Blimey! Aye aye! CONS-Long rocket, vulnerable t' body damage when it lands if on hard ground. Beefin' up the lower tube helps, cuttin' t' length o' t' main tube will help and reduce some weight.

Other:
It needs t' have a camouflage paint scheme, shiver me timbers, olive drab/ultra flat brown/tan (Krylon camo series paints) and then you need t' have a spray paint that has a fan nozzle, me bucko, like t' one's from Duplicolor auto paint at Walmart. Begad! Blimey! Ahoy! Blimey! T' fan will do a wide spray, or a thin line, me hearties, this is what you do for t' "Tiger stripes". Begad! Blimey! This kit taught me you can use minimum diameter and have it come out great. You need t' reinforce t' lower launch lug mount since it is raised, and I wrapped a small piece o' glass over it t' reinforce it from t' top.

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