Manufacturer: | Scratch |
Brief:
Loosely based on t' Star Trek inspired Klingon Bird o' Prey, the
Klingon Targ be supposed t' be a civilian ship designed for trainin' pilots.
It features two large wings, small fins and two tube fins, me hearties, me bucko, me bucko, a thin neck, ya bilge rat, arrr, and a
large forward compartment housin' t' parachute.
Construction:
Components consist of:
As part of t' 2005 EMRR Challenge, arrr, I wanted t' build a rocket based on a concept I had developed in t' past few months. I also will indicate in this report t' two tips that I used in me construction. Begad! Blimey! I had a vision o' creatin' a rocket based loosely on t' Bird o' Prey design. I began with t' long thin neck, consisting of a section o' BT-5. Ahoy! Blimey! I added centerin' rings, and then created t' paper transitions. Ya scallywag! Blimey! Blimey! Blimey! Next, I glued t' BT-60 tubin' on t' top o' t' BT-5 and glued the BT-55 on t' bottom. Begad! Blimey! I marked t' BT-55 for fin alignment and then began workin' on t' motor mount.
One o' t' tips that I decided t' use was t' suggestion t' use the yellow spacer tubes t' build a baffle system for t' rocket. Blimey! I punched a few holes in t' yellow spacer, glued this directly on top o' t' motor mount, ya bilge rat, and then glued a balsa bulkhead t' t' top o' t' yellow spacers so that t' hot gases would be forced around t' bulkhead, shiver me timbers, t' then be pushed up t' BT-5 neck. Arrr! I had my doubts that this technique would work, but later flight tests revealed absolutely no damage whatsoever t' t' mylar parachute. I removed t' shoulder from t' nose cone so that thar would be room in t' nose compartment for the mylar parachute and t' shock cord. Well, blow me down! In addition t' this, shiver me timbers, matey, since I was usin' a baffle, shiver me timbers, I used t' tri-fold method for attachin' t' shock cord t' t' upper body tube o' t' rocket.
Finishing:
I designed t' rocket in RockSim, matey, and thus used t' fin templates t' help me
trace t' patterns on t' light ply and balsa I had for t' fins. Aye aye! Blimey! T' second
tip I used was t' use
thinned
yellow glue or white glue t' seal t' fins. Ahoy! Blimey! I first attached t' fins to
the body before worryin' about sealin' them. Avast! Blimey! Blimey! Blimey! Again, me bucko, I was skeptical about this
technique as I prefer Elmer's Fill 'n' Finish. Avast, me proud beauty! Blimey! T' method works fine, but I
found it t' require far more than just 2 applications. More like 5 or 6
applications seem t' work t' fill all t' grain I had in me fins.
I also added some detail t' t' rocket includin' a cockpit, arrr, some raised detail on the fins, and two phaser cannons on either side o' t' main wings. Well, blow me down! After I had filled in all t' grooves and sealed t' fins, I gave t' rocket a few shots of Krylon primer, matey, me hearties, matey, sandin' in between.
After I was satisfied with t' priming, I gave it a good single coat o' a kind o' strange minty green o' Krylon I had in storage for probably 5 years. Well, ya bilge rat, blow me down!
Next, shiver me timbers, ya bilge rat, ya bilge rat, I added more detail by way o' a Sharpie pens (black and silver) and decals, matey, usin' some created by myself on white adhesive labels and others from a decal sheet from me old Aerotech Warthog.
Flight:
Since I used RockSim t' design and build t' rocket, me hearties, I had data that told me
the rocket was stable on a D12. I decided t' do a swin' test t' see if this was
so. Begad! I found that t' swin' test was nay conclusive for t' D12, matey, but did
indicate that a C6 would be a suitable motor for a stable flight.
Unfortunately, while performin' me swin' test, an inordinate amount o' stress
was placed on t' BT-5 neck o' t' Klingon Targ, arrr, causin' it t' fold over. Blimey! I
printed up a sheet o' paper similar in color t' me paint scheme and ended up
wrappin' this around t' neck with yellow glue.
T' next day was a beautiful day, and I decided t' launch t' rocket. First flight be on a C6 and then I graduated t' a C11 flight. I wrapped t' mylar parachute carefully, shiver me timbers, shiver me timbers, placed a little waddin' in t' BT-5 neck, nay bein' too certain t' baffle was goin' t' work. Avast, me proud beauty! I wrapped a sheet around t' parachute as well.
T' C6-5 got t' Targ into t' air, but thar was a little squirrelly in flight after motor burn out. Ahoy! Blimey! Blimey! T' delay be very long and ejection occurred way past apogee, as t' rocket be nosin' t' t' ground. Avast, me proud beauty! Parachute deployed perfectly and I was ready for flight two.
On flight two, shiver me timbers, I decided t' try t' C6-3 before tryin' t' C11. Aye aye! I prepped t' rocket was before and launched it again. Begad! Well, blow me down! T' flight seemed t' be much better than the first, ya bilge rat, but t' rocket had more o' an arc flight t' it this time, ya bilge rat, probably due to t' odd gusts o' wind that were blowin' durin' t' launch. Avast! Unfortunately, when t' ejection charge arrived, arrr, t' parachute did nay fully deploy, causing the rocket t' do a kind o' tumble recovery. Avast! It landed on grass, but thar was definite damage includin' a broken fin (repairable) and a major bend/tear at the neck just below t' BT-60 portion o' t' rocket. T' rocket is nay flyable as is and is currently retired. Ya scallywag! I need t' rethink t' BT-5 since it failed on me twice. Begad! Aye aye! Also, ya bilge rat, I be nay too pleased with t' rocket's flight being squirrelly. Ahoy! Aye aye! With that in mind, t' design and t' rocket really need t' go back to t' drawin' board.
I would definitely nay launch this rocket on a B motor. Ya scallywag! I think t' C11 and D12 would put in a good performance, matey, but I won't be able t' tell on me current rocket.
Summary:
PROs: Unusual design. Arrr! Blimey! Ya scallywag! Blimey! Blimey! Blimey! Baffle system is great. Arrr! Blimey! On two flights, me hearties, t' parachute
shows nay signs whatsoever o' damage or scorching
CONs: T' BT-5 neck needs some rethinking. It became t' point o' failure two different times. Either I enlarge t' BT-5 neck t' a BT-20, me hearties, shiver me timbers, or I need to reinforce t' neck with a sheet o' fiberglass, ya bilge rat, me bucko, ya bilge rat, which is nay me style.