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500 Class Electric Helicopters 500 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


View Poll Results: Should you ground the frame?
Yes, its worth it to avoid glitches 38 33.04%
No, too much chance of shorting something out 39 33.91%
Not sure 38 33.04%
Voters: 115. You may not vote on this poll

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Old 03-27-2008, 02:46 PM   #41 (permalink)
 

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Quite funny indeed......

Make sure that 1K resistor is at least rated at 1/2 watt.......or it could fry if a ESC motor wire chaffs the frame.....
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Old 03-27-2008, 04:55 PM   #42 (permalink)
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Quote:
Originally Posted by Tailrotor Joe View Post
Quite funny indeed......

Make sure that 1K resistor is at least rated at 1/2 watt.......or it could fry if a ESC motor wire chaffs the frame.....

Good point:

I = E/R = 24v/1000ohms = 20 mA
P = IV = 20mA * 24v = .58 Watt

Better use a 3/4 Watt to handle a direct short of the battery.

Looks like resistors typically come 1/4, 1/2, and 1 watt. Maybe we could up the resistance a bit so 1/2 watt would be OK.


Rick
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Last edited by rdlohr; 03-27-2008 at 07:20 PM..
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Old 03-28-2008, 09:09 AM   #43 (permalink)
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just a few thoughts and questions.

Are we grounding the frame or are we grounding the motor to muffle the ESC and the frame is just incidental?
I want to say that the resistor idea is brilliant! however, won't any 2 wire simultaneous connection across the frame will negate this, such as the 2 lipo leads?
Why not take clear packing tape and wrap all of the edges where wires are going to be too. Its much less abrasive than a raw CF frame edge and it insulates too. Braided wrap is a good alternative also, but impractical on the big wires.

Will grounding the frame not cause more signal blockage to the stubby little antennas on the spektrum RXs were so fond of or is the fact that theres a conductor between the TX and RX sufficient to block the signal?

-Michael
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Old 03-28-2008, 09:13 AM   #44 (permalink)
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Quote:
Originally Posted by rdlohr View Post
Good point:

I = E/R = 24v/1000ohms = 20 mA
P = IV = 20mA * 24v = .58 Watt

Better use a 3/4 Watt to handle a direct short of the battery.

Looks like resistors typically come 1/4, 1/2, and 1 watt. Maybe we could up the resistance a bit so 1/2 watt would be OK.


Rick
Just parallel a pair 2.2K 1/2 watt resistors = 1 watt, 1.1K

They can also be considered expendable. Electronics engineers frequently install 1 ohm resistors of low wattage on circuit boards to act as a non replaceable fuse. In case of some other component short down the line, the resistor burns out and there is no fire and maybe, components up the supply line do not burn out as a result.
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Old 03-28-2008, 09:35 AM   #45 (permalink)
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Quote:
Originally Posted by michael503 View Post
Just parallel a pair 2.2K 1/2 watt resistors = 1 watt, 1.1K

They can also be considered expendable. Electronics engineers frequently install 1 ohm resistors of low wattage on circuit boards to act as a non replaceable fuse. In case of some other component short down the line, the resistor burns out and there is no fire and maybe, components up the supply line do not burn out as a result.
I was considering the higher resistance to conserve the weight required for a 1 watt resistor. You are right, these could be expendable like a fuse.

Rick
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Old 03-28-2008, 09:44 AM   #46 (permalink)
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Old 03-28-2008, 03:45 PM   #47 (permalink)
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Hi

I voted yes as all wiring should be clean and well insulated, I do like the idea of installing a fuseable resistor, this would solve the problem of shorting during a crash.

Alexe
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Old 03-29-2008, 08:03 PM   #48 (permalink)
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Does this only apply to CF frames or are GF frames conductive also?

PH
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Old 03-29-2008, 08:18 PM   #49 (permalink)
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Quote:
Originally Posted by PlasticHead View Post
Does this only apply to CF frames or are GF frames conductive also?

PH
I'm not sure what GF is made from. I've not heard people complaining about a problem with GF though.

Rick
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Old 03-29-2008, 08:52 PM   #50 (permalink)
 

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Quote:
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I'm not sure what GF is made from. I've not heard people complaining about a problem with GF though.

Rick
Glass fiber aka fiberglass
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Old 03-29-2008, 08:55 PM   #51 (permalink)
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Quote:
Originally Posted by chichiuno View Post
Glass fiber aka fiberglass
So it probably is not conductive. Take an ohm meter and check between some screws and/or on the edges.

Rick
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Old 03-29-2008, 10:00 PM   #52 (permalink)
 

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Quote:
Originally Posted by rdlohr View Post
So it probably is not conductive. Take an ohm meter and check between some screws and/or on the edges.

Rick
correct, non conductive.
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