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Old Feb 26, 2012, 02:26 PM
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if you sheet with balsa, you won't need FG. it's just needless added weight IMHO. if you want FG, I would cut a core, sand to shape, spackle, then FG. the problem with a cut core, is that you've got to hollow out sections for servos, flap recesses, aileron recesses, etc.. if it were me, I would do a built up wing using foam ribs, with balsa, hard wood and CF for stringers and spars. with a wingspan this large, I would be very suspect of the structural integrity of a foam core. if you look at super large scale builds, more often than not, they use a built up wing because A) it's lighter than a foam core, and B) it's stronger than a foam core of the same size. the bonus is that you can build everything right into the wing and not have to reverse engineer a cut foam core to make everything fit right.

this is your decision to make here, but thought I'de point out some pros and cons of foam verses built up. the obvious pro to a cut foam core, is the ease of manufacture. it's the easy way out, but not the best way out. there's lots of ways to do a built up wing, if you think it through and design it on paper, or computer.

Rich
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Old Feb 26, 2012, 03:13 PM
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Originally Posted by k.smith459 View Post
how about hotwiring my wing cores then sheeting the with balsa and give the top surface a coat of fibreglass
Keenan thats a great ideah if you Hot-wire the 225's wings & stabilizer & twin rudders your 225 build will be possibile, try and find a UK RCG member that has a Hot-wire you can borrow. I would also ask Pontious how he would build your An-225 he's great at making large Depron jets.
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Old Feb 26, 2012, 03:19 PM
ich bauen groß modell flugzeug
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ill ask arkum if i can borrow his
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Old Feb 26, 2012, 03:56 PM
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an even better option may be to do a built up center section and a hot wired outer section. the beauty of this solution, is that you can have remaovable outer sections that can be attached via aluminum tube. the wing essentially becomes a three piece and entirely removable. if I was going this route, I'de do the inner 4 engine pylons as a built up section and the outer portion with a single pylon on each section. to power this setup, you'de wire the inner pair of fans, the middle pair of fans and then the outer pair of fans. the outer pair of fans could be set up in such a way, that they draw their power off the same system as one of the other pairs, but they only draw power after the throttle is above say, 75% or 80% position. so, for flight, you run off four fans and for takeoff, etc., you are using all six. just a thought I was having to increase your flight time.

Rich
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Old Feb 26, 2012, 07:10 PM
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http://www.rcmovie.de/video/3387c7e3...ver-Duebendorf
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Old Feb 26, 2012, 09:02 PM
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Originally Posted by k.smith459 View Post
my plan is to have the batteries in the wingbox with the esc's 6" away with there heatsinks poking out of the wing and then the motor wires down to the motors ??

Keenan
Depends on how far your "wingbox" is from your ESCs. The idea is to keep the battery to ESC wires as short as possible. Motor to ESC wires are really not an issue. Jim
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Old Feb 26, 2012, 11:42 PM
clsink1128
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Can't wait to see this big bird come together. Best of luck. Post plenty of pics
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Old Feb 26, 2012, 11:48 PM
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it might be a good option to mount the ESC's behind each fan. since you aren't pushing a lot of power on 4S or 5S, you shouldn't be worried about wire length. on 4S, I ran a wire 22 inches from the battery to the ESC connector. the battery was slightly warmer than when it was the stock length, but not by much. ideally, you want the motor to ESC wires a bit longer, but at these power levels, it's not a big deal which wires you extend. if it were me, I'de mount the ESC's behind each fan and run the wires up into the wings. mount the packs in the wings if there's enough room, or further on into the wing root somewhere. just a thought.
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Old Feb 27, 2012, 07:56 AM
ich bauen groß modell flugzeug
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how about 3-4 inches from the root ? ??
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Old Feb 27, 2012, 07:56 AM
ich bauen groß modell flugzeug
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Can't wait to see this big bird come together. Best of luck. Post plenty of pics
Thanks Clsink
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Old Feb 27, 2012, 09:42 AM
ich bauen groß modell flugzeug
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how about if i kit this plane out with Power HD MG servo's all round

http://www.valuehobby.com/radio-syst...hd-1501mg.html


and at $12 per servo they should'nt burn a hole in my pocket (only using 9g servo's on the spoilers
My freinds airframe will have an assortment of his of his own servos
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Old Feb 27, 2012, 09:51 AM
ich bauen groß modell flugzeug
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Edited the first post
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Old Feb 27, 2012, 04:42 PM
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Originally Posted by k.smith459 View Post
how about if i kit this plane out with Power HD MG servo's all round

http://www.valuehobby.com/radio-syst...hd-1501mg.html


and at $12 per servo they should'nt burn a hole in my pocket (only using 9g servo's on the spoilers
My freinds airframe will have an assortment of his of his own servos
Not a Bad MG servo K, Hobbyking has something similar, They sell them for $10 a piece, just remember they weight of these servos adds up, if your not carefull you could wind up with a pound or more servos !
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Old Feb 27, 2012, 04:48 PM
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thats 10 servos weighing 600g in total

BTW do you have the link to the HK servo ?
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Old Feb 27, 2012, 05:43 PM
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Originally Posted by k.smith459 View Post
thats 10 servos weighing 600g in total

BTW do you have the link to the HK servo ?
Here Ye-Go Mate!

http://www.hobbyking.com/hobbyking/s...g_0_17sec.html

http://www.hobbyking.com/hobbyking/s...g_0_17sec.html

http://www.hobbyking.com/hobbyking/s...32g_0_15s.html
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