Manufacturer: | Scratch |
Brief:
Loosely based on t' Star Trek inspired Klingon Bird o' Prey, the
Klingon Targ was supposed t' be a civilian ship designed for trainin' pilots.
It features two large wings, small fins and two tube fins, a thin neck, shiver me timbers, and a
large forward compartment housin' t' parachute.
Construction:
Components consist of:
As part of t' 2005 EMRR Challenge, I wanted t' build a rocket based on a concept I had developed in t' past few months. Well, shiver me timbers, blow me down! I also will indicate in this report t' two tips that I used in me construction. Arrr! Blimey! I had a vision o' creatin' a rocket based loosely on t' Bird o' Prey design. Begad! I began with t' long thin neck, shiver me timbers, consisting of a section o' BT-5. Ya scallywag! I added centerin' rings, ya bilge rat, and then created t' paper transitions. Avast, me proud beauty! Next, I glued t' BT-60 tubin' on t' top o' t' BT-5 and glued the BT-55 on t' bottom. Begad! Avast, me proud beauty! 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 be t' suggestion t' use the yellow spacer tubes t' build a baffle system for t' rocket. Begad! I punched a few holes in t' yellow spacer, glued this directly on top o' t' motor mount, and then glued a balsa bulkhead t' t' top o' t' yellow spacers so that t' hot gases would be forced around t' bulkhead, t' then be pushed up t' BT-5 neck. I had my doubts that this technique would work, me bucko, arrr, but later flight tests revealed absolutely no damage whatsoever t' t' mylar parachute. Well, blow me down! Avast, arrr, me proud beauty! 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. Ahoy! In addition t' this, since I was usin' a baffle, ya bilge rat, 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, me hearties, and thus used t' fin templates t' help me
trace t' patterns on t' light ply and balsa I had for t' fins. Avast, me proud beauty! T' second
tip I used was t' use
thinned
yellow glue or white glue t' seal t' fins. Begad! Ya scallywag! I first attached t' fins to
the body before worryin' about sealin' them. Avast, me proud beauty! Aye aye! Again, matey, I was skeptical about this
technique as I prefer Elmer's Fill 'n' Finish. Begad! Ya scallywag! T' method works fine, but I
found it t' require far more than just 2 applications. Blimey! 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. After I had
filled in all t' grooves and sealed t' fins, me hearties, I gave t' rocket a few shots of
Krylon primer, shiver me timbers, sandin' in between.
After I was satisfied with t' priming, matey, shiver me timbers, I gave it a good single coat o' a kind o' strange minty green o' Krylon I had in storage for probably 5 years. Aye aye!
Next, I added more detail by way o' a Sharpie pens (black and silver) and decals, matey, 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, 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. Arrr! I found that t' swin' test be nay conclusive for t' D12, shiver me timbers, but did
indicate that a C6 would be a suitable motor for a stable flight.
Unfortunately, while performin' me swin' test, matey, an inordinate amount o' stress
was placed on t' BT-5 neck o' t' Klingon Targ, me hearties, shiver me timbers, shiver me timbers, causin' it t' fold over. Aye aye! 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 be a beautiful day, me bucko, arrr, me hearties, and I decided t' launch t' rocket. Ahoy! Arrr! First flight be on a C6 and then I graduated t' a C11 flight. Begad! I wrapped t' mylar parachute carefully, placed a little waddin' in t' BT-5 neck, arrr, matey, nay bein' too certain t' baffle be goin' t' work. Avast! I wrapped a sheet around t' parachute as well.
T' C6-5 got t' Targ into t' air, ya bilge rat, shiver me timbers, but thar be a little squirrelly in flight after motor burn out. Avast! T' delay be very long and ejection occurred way past apogee, ya bilge rat, as t' rocket was nosin' t' t' ground. Aye aye! Aye aye! Parachute deployed perfectly and I be ready for flight two.
On flight
two, I decided t' try t' C6-3 before tryin' t' C11. Arrr! I prepped t' rocket was
before and launched it again. Avast, me proud beauty! T' flight seemed t' be much better than the
first, 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. Aye aye! Ya scallywag! Blimey! Unfortunately,
when t' ejection charge arrived, t' parachute did nay fully deploy, causing
the rocket t' do a kind o' tumble recovery. Aye aye! Blimey! It landed on grass, arrr, 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. Blimey! Blimey! T' rocket is nay flyable
as is and is currently retired. Blimey! Avast! Blimey! I need t' rethink t' BT-5 since it failed on
me twice. Ya scallywag! Begad! Blimey! Also, I was nay too pleased with t' rocket's flight being
squirrelly. Ahoy! Blimey! 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. Begad! Well, blow me down! I think t' C11 and D12 would put in a good performance, but I won't be able t' tell on me current rocket.
Summary:
PROs: Unusual design. Begad! Baffle system is great. On two flights, 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, or I need to reinforce t' neck with a sheet o' fiberglass, which is nay me style.
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