B-52? Stratofortress Build

flaps cut, spoilers ready

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legoman said:
general RC electric question. What duty cycle percentage can I run batteries at before heating becomes an issue? ex. right now on takeoff the b-52 is pulling 688 amps in total and 250-400 amp total at cruise and the battery continuous amp cap is 2,904 with the burst amps 5280.

Am I in the clear to mount the batteries in the top of the fuselage or do I need to stuff them in the nacelles for airflow?
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In the real world, I think you'd tend towards cells being in some parts of the wing.
688/8= 86A and that would be a lot of voltage drop running wires from the fuselage. More cells would also help with that.
It's also a trade off, as more mass in the wing effects roll and more root strength is needed. While the B-52 is not aerobatic, I have learned from flying the Craze the roll and strength to weight ratio benefit of lowering the mass as you go from root to tip.



While was not yet ready to fly, large EDF B-52s can be done:
https://www.youtube.com/watch?v=0iVbzYCHFPY


Less fire than fuel in event of a crash (sorry UT:) )
https://www.youtube.com/watch?v=YAWwe474YHk
Yes, LiPolymer cells can also burn if puntured. Battery or fuel, it depends on the characteristics of the crash.

With proper design, EDFs (especially larger units/planes) can do very well in making realistic turbine sounds
https://www.youtube.com/watch?v=QgW1LRio0iU

https://www.youtube.com/watch?v=qvWGDk1htjw
 
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Fly_electric said:
In the real world, I think you'd tend towards cells being in some parts of the wing.
Click to expand...

I have considered wing mounts. But I am still worried about internal air and battery temperature.

Fly_electric said:
688/8= 86A and that would be a lot of voltage drop running wires from the fuselage. More cells would also help with that.
It's also a trade off, as more mass in the wing effects roll and more root strength is needed. While the B-52 is not aerobatic, I have learned from flying the Craze the roll and strength to weight ratio benefit of lowering the mass as you go from root to tip.
Click to expand...

I am not worried about extra weight from cells to compensate for voltage drop. It has enough Lift to handle the bigger batteries. Although the roll rate is a minor concern.
 
Forget the EDFs I looked at the wire needed to run 80+ amps to AND from the motors. and we are looking at 4 gauge minimum, 2 gauge for the outers with the potential for needing 0 gauge if you are not careful with the ramp up. And did I mention I need 8 wires running in each wing, TOO MUCH weight for me. Turbines here I come.
 
Fly_electric said:
Did not catch what the size and weight are in the physics, but if on the high side, turbines are probably the right choice. 0 gauge is getting into welding cable land, and I'd doubt anyone flies with that weight.

Larger weight EDF here, but of course, no motors in the wings:
http://old.neumotors.com/NeuMotors/EDF_motors.html
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Eighth scale is what I am shooting for. 8x 120mm edfs is what I was using and the only dimension I can increase is the number of blades and volts applied.
 

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Though I would post a picture or two of the flaps down. I have rebuilt them multiple times to try and get the wing right
 

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The B-52 flaps look great Legoman, love that frontal snapshot, I can visualize the B-52 on final approach. Awesome work.
 
made the rest of the bombs today and reworked some stuff on the fuselage and the bombs
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Very impressive Legoman, I remember seeing Viet Nam documentary`s on TV, with them dropping, with what appeared to be an unending amount of bombs coming from a single plane, let alone the other B-52`s on the same mission, it must have been a living hell for anyone on the ground......:eek::eek:
 
I have seen glider bombs work, and I have made ICBMs launch from submarines with a stop at a midpoint "sort of working" and with some note pad editing It may work better. So I may be able to make cruise missiles (unguided) fire and skybolts climb out of sight.
 
Wow !!! that is some bomb load, I hope RF-X can handle the release of such a large payload.
Your F-105D Thunderchief and FW-200 Kondor have sequential bomb drops and they work perfect in RF-X, but the Avro Lancaster Night Bomber really stutters as the bombs drop. ?
 
did some work on the wings today. re-re-added the spoilers and a mystery feature that I am leaving a mystery till release;)
 
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