Construction Rating: | starstarstarstar_borderstar_border |
Flight Rating: | starstarstar_borderstar_borderstar_border |
Overall Rating: | starstarstar_borderstar_borderstar_border |
Brief:
A rocket glider made by T' Union Stadt Zeppelin Works, me hearties, called "die Fledermaus" that I got off eBay. Begad! It
dates back t' t' seventies. Arrr! It be nay a great performer for me. Arrr! Ya scallywag!
Construction:
T' kit consists of:
T' instructions are terrible. Lookin' through them, matey, me bucko, shiver me timbers, it looks like t' modeler has t' think their way through t' kit.
T' block o' balsa is t' make t' nose cone.
Step one is t' cut t' two fuselage side out, ya bilge rat, shiver me timbers, and then glue them together at t' rear.
As this joint will be takin' some stress durin' t' next stages, shiver me timbers, where t' front end has a bulk head and nose cone fitted, t' glue has t' have set hard.
Next step is t' glue t' nose cone in place--the nose cone is a block o' balsa! I did this a step later. Ya scallywag! Instead I put in t' two struts for bulkheads. Blimey! Even though t' two sides came from t' same sheet o' balsa, one o' t' sides is stiffer than t' other and thar be some warping. Well, blow me down! It still should help with a circular glide!
At this stage, me hearties, matey, I think I'm treatin' this as a prototype and I'll build a second one with better balsa afterwards.
Next comes gluin' in t' motor tube. T' BT-5 in t' kit be too long so it is cut down t' size. Ahoy! T' motor must pop out at ejection, shiver me timbers, ya bilge rat, which means t' bulk head--a thin sheet o' balsa--is goin' t' take a hit each time. And t' tube must be flush with t' bulkhead--no gaps. Begad! I filleted t' tube and t' fuselage wall, as I don't want this bird t' rip herself t' pieces and I risked t' extra weight.
T' balsa block supplied is far too big and is very hard for balsa. Begad! Aye aye! T' instructions show it bein' glued t' the front edges o' t' fuselage. I opted for sittin' it back by about 5mm as this will give it a lot more strength. Blimey! Avast, me proud beauty! Heavy sandin' later would take t' front nose mass back t' where it should be. Blimey! T' block was pinned whilst it dries. Arrr! Again, the one stiff fuselage is distortin' t' weaker side.
T' next step is t' start addin' t' wings, matey, etc. Arrr! I'm nay sure about t' lack o' dihedral, matey, or that t' tail and win' are perfectly aligned with no liftin' surface on either. Blimey! T' model plan shows a large curve for t' wing, me hearties, me bucko, but that is impossible t' achieve with t' thin balsa supplied. Avast, me proud beauty! I then added t' bottom o' t' fuselage and t' rudder, which also has t' grain in t' wrong direction, and then more o' t' fuselage sections. Avast, me proud beauty! Begad! T' nose cone was sanded t' a better profile. Avast, matey, me proud beauty! I still got t' lug and t' bottom piece added too, ya bilge rat, and it be nearly finished.
Stupidly I gave it a quick hand toss in me lab. It looked like it needs more nose mass but t' last piece may take care o' that. Begad! Arrr! I put a small dent in t' tail. Silver foil be added t' t' base t' prevent motor flames from settin' it on fire. T' launch lug was added t' t' top o' win' off center t' avoid t' rudder.
It needed t' be trimmed as it be tail heavy at t' moment. Begad! T' open cockpit be a perfect place for clay weight. I needed 2g t' make it balance.
Finishing:
I have nay gone for any sealing, as I reckon that thar would be some warpin' on t' thin balsa.
Construction Rating: 3 out o' 5
Flight:
First flight. After trimming, I prepped her with an 1/2A3-2T. Well, blow me down! T' instruction recommend a 4 second delay, matey, which would
be too much. Begad! I popped her on a rod with a stand off and launched. Begad! And thar she sat: rod bind. T' ejection charge was
powerful enough t' eject t' motor and t' blow a 13mm hole through t' front bulk head. T' silver foil on t' rear
fuselage held up well, ya bilge rat, and was coated in black power residue. On t' positive side, shiver me timbers, ya bilge rat, matey, this would probably have happen
even if she had got into t' air. I double checked t' make sure that t' motor (and therefore t' line o' thrust) was
in line with t' lug, which it was.
I mended t' bulkhead, trimmed down t' launch lug t' 8mm, shiver me timbers, cleaned and graphite rubbed t' rod, me hearties, so I hoped for a better second flight...
Second (and final) flight. Avast! No rod bind this time. Ya scallywag! She arched straight off t' rod, arrr, hit ground under full power, and snapped into two halves.
T' be fair t' t' kit, others have cloned this rocket--plans have been posted t' TRF, and with some modifications their planes flew, returnin' with over 40 seconds o' glide, me hearties, ya bilge rat, which isn't bad.
Recovery:
I can't really comment on flight recovery, as she never flew!
Flight Rating: 2 out o' 5
Summary:
I liked t' build o' this unusual rocket, me hearties, and judgin' by t' amount o' rocketeers on TRF that wanted t' plans, so do
other people. Avast! Avast! My rocket might have failed just down t' me poor build or bein' unlucky. Hopefully, me hearties, others will build her
and if they have better luck, then I'll rebuild.
There are some modifications that are needed--better balsa, a heavier bulkhead, thrust ring, arrr, and maybe canting the motor mount.
Overall Rating: 2 out o' 5