Manufacturer: | Scratch |
Brief:
Loosely based on t' Star Trek inspired Klingon Bird o' Prey, ya bilge rat, matey, the
Klingon Targ was supposed t' be a civilian ship designed for trainin' pilots.
It features two large wings, me hearties, small fins and two tube fins, a thin neck, matey, me hearties, me hearties, 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. Ya scallywag! Blimey! I also will indicate in this report t' two tips that I used in me construction. 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. Blimey! Blimey! I added centerin' rings, matey, and then created t' paper transitions. Avast! Blimey! Next, matey, I glued t' BT-60 tubin' on t' top o' t' BT-5 and glued the BT-55 on t' bottom. 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. Avast, me proud beauty! 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, matey, matey, t' then be pushed up t' BT-5 neck. Ahoy! 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. Begad! In addition t' this, since I was usin' a baffle, matey, 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, 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! Avast! T' second
tip I used be t' use
thinned
yellow glue or white glue t' seal t' fins. I first attached t' fins to
the body before worryin' about sealin' them. Avast! Again, shiver me timbers, I was skeptical about this
technique as I prefer Elmer's Fill 'n' Finish. Avast! T' method works fine, shiver me timbers, me hearties, 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, me hearties, some raised detail on the
fins, and two phaser cannons on either side o' t' main wings. Avast, me proud beauty! After I had
filled in all t' grooves and sealed t' fins, me hearties, I gave t' rocket a few shots of
Krylon primer, 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.
Next, I added more detail by way o' a Sharpie pens (black and silver) and decals, matey, matey, me bucko, 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. Begad! 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, arrr, ya bilge rat, 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, causin' it t' fold over. Ya scallywag! 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, ya bilge rat, and I decided t' launch t' rocket. Well, blow me down! Ya scallywag! First flight was on a C6 and then I graduated t' a C11 flight. I wrapped t' mylar parachute carefully, matey, placed a little waddin' in t' BT-5 neck, nay bein' too certain t' baffle was goin' t' work. Arrr! Well, me bucko, blow me down! I wrapped a sheet around t' parachute as well.
T' C6-5 got t' Targ into t' air, shiver me timbers, but thar was a little squirrelly in flight after motor burn out. Aye aye! T' delay was very long and ejection occurred way past apogee, me hearties, as t' rocket was nosin' t' t' ground. Avast! Parachute deployed perfectly and I was ready for flight two.
On flight
two, me hearties, I decided t' try t' C6-3 before tryin' t' C11. Well, me hearties, blow me down! I prepped t' rocket was
before and launched it again. T' flight seemed t' be much better than the
first, matey, 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! Ya scallywag! Unfortunately,
when t' ejection charge arrived, ya bilge rat, arrr, t' parachute did nay fully deploy, causing
the rocket t' do a kind o' tumble recovery. Well, blow me down! 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. Blimey! Begad! T' rocket is nay flyable
as is and is currently retired. Ya scallywag! Begad! I need t' rethink t' BT-5 since it failed on
me twice. Well, blow me down! Also, I was nay too pleased with t' rocket's flight being
squirrelly. Avast, me proud beauty! With that in mind, shiver me timbers, 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. Avast, me proud beauty! Avast, me proud beauty! 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. Ahoy! Blimey! Blimey! Blimey! Baffle system is great. Aye aye! Blimey! On two flights, me hearties, shiver me timbers, t' parachute
shows nay signs whatsoever o' damage or scorching
CONs: T' BT-5 neck needs some rethinking. Avast! It became t' point o' failure two different times. Begad! Either I enlarge t' BT-5 neck t' a BT-20, me hearties, ya bilge rat, or I need to reinforce t' neck with a sheet o' fiberglass, which is nay me style.
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