Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Sep 11, 2012, 09:02 AM
Colonel Blink is offline
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So I'M meant to be in control?
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Another QQ..... how much throw would be needed on rudder & elevator? I was thinking about 10mm max on rudder and 5mm on elevator? Sizes can be seen in the photo. I'm hoping i wont need more throw than that, as due to my own poor design they start to foul one another.........whoops!
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Old Sep 11, 2012, 10:25 AM
Sundancer is online now
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Sounds about OK to me Colonel. Maybe set these (10 mm rudder and 5 mm elevator) as values for, say 60% rates then if you find they are not enough you could switch one of the rates out. But I honestly think they will be enough, my Witch has a very small rudder and only needs that much throw.

All this talk of control throws!! Getting exciting now!
Old Sep 14, 2012, 03:16 AM
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So I'M meant to be in control?
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I believe that it is time for me to make a project report to my seniors

Gentlemen (and ladies if there are any, or any who wish to be...); based upon my previous joblist, current position is as follows:
a) Cover the wing with mylar - done
b) Cover the wing with white tissue - done
c) Curse at the patchy finish - done
d) Remove warps in wing induced by covering - done
e) Decorate to choice - done
f) Attach tail feathers (these will need to be permanently affixed, so lets hope the incidence is OK) - done
g) Find servo fittings and attach servos - Have only found one set of fittings; though luckily I had already attached the operating arm to the other servo. So I'm only two of the tiny mounting screws short. There is only one place remaining to search - the ridiculously overflowing bin which is full of the detritus of the whole build and more. If that doesn't produce the fittings, then a blob of hot glue will be the fallback position
h) Add control horns - done
i) Make up pushrods and attach - Both pushrods made up, rudder one attached, elevator one to be attached when the glue holding the tail feathers has dried
j) Attach undercarriage
k) Add battery Velcro - done
l) Balance - A preliminary balance attempt indicates that weight distribution may not have gone in my favour!
m) Add noseblock - Made and covered; may attach using magnets to assist with balancing. I thought about twenty magnets should do it....
n) Set up R/E throws - Rudder throw currently 8mm each side, elevator to be set when pushrod attached (see point i)
o) Pray
p) Test glide & adjust
q) Fly
r) Congratulate oneself, or return to Post 1 of this thread
Old Sep 14, 2012, 04:14 AM
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I like real wooden aeroplanes!
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Wow! The tension is killing me!
Old Sep 15, 2012, 05:00 AM
Colonel Blink is offline
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So I'M meant to be in control?
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D'you know what..............????


............I think it's finished.
Old Sep 15, 2012, 05:57 AM
owlsabie is online now
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Fantastic Colonel!! God luck with the maiden.
Old Sep 15, 2012, 06:59 AM
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That is super Colonel, top job.

Since I was one of the original "gang of several" who applied pressure to get you started on this build I feel quite proprietorial about it, almost as if I had built it myself. I think the end result more than justifies the pressure applied!

Very best of luck with the maiden flight, but do wait for the right conditions!
Old Sep 15, 2012, 09:57 AM
rabidrue1 is offline
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Nice one blink should fly fine.
Old Sep 15, 2012, 12:01 PM
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OK now the bad bit.....


.....my idea of weight distribution went horribly wrong

It is significantly tail heavy (hence my interest in Harry D's 2g servos); and to get it to balance anywhere near the spar, I'm having to strap 14g of lead under the nose. Fiddling about shows that if I move the Lipo forward a couple of bays it will balance, but that would require ripping the covering off and some open fuz surgery. If it flies and it seems worth it, I will probably do that. But for initial proving it will be external lead and lakky band!

The good news is that even with the lead, AUW is c160g; 20g under my upper target. With a 6x3 GWS prop, the wattmeter shows 21W @ 3A and seems to have a healthy 'pull'.
Old Sep 15, 2012, 01:10 PM
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So even with the ballast it is still under 6 ounces. Your 21 watts equates to 60 watts/pound - should fly fine at that. The nose weight is sensible insurance for the first flight, but I wouldn't be at all surprised if you find out that you don't need all of it in the end.
Old Sep 15, 2012, 03:17 PM
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That colour scheme is just so 2012! Nice one.

I think your Ajax will be very successful at that weight and power level. My last FF version had a kp01 and flew quite well in very calm conditions.

Good luck.
Ian
Old Sep 15, 2012, 03:21 PM
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Lovely model, Colonel. Plenty of power and I'm sure she will be a fantastic flier, she's a K.K. model after all.
A minor surgery will be worth to get rid of the tail heaviness!
Old Sep 15, 2012, 05:45 PM
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Pictures


Thanks for the pictures Colonel and good luck with that first flight, test glide over long grass, as they used to say in the old f/f days. Brian M.
Old Sep 15, 2012, 05:47 PM
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Looks great. Well done.


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