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motor and esc question?

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elolz_Au View Drop Down
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  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Topic: motor and esc question?
    Posted: 08/Jun/2012 at 2:06pm
I have a RCtimer 50 amp ecs: specs below;
Continuous current:50A
Burst current:60A
BEC: 5V3A
PWM: programmable - 8/16K
Battey: 4-12 Ni-Mh/Ni-Cd or 2-4 Lipo

and a Turnigy 2836 2350kv motor
Max performance;
Voltage: 3-4S Lipoly
Prop: APC4.7x4.25
Thrust: 800g
Power: 480W

I want to know if it is okay to use this setup in a skyfun with a 6x4 prop.. would there be any problems?

any help would be very much appreciated :)
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 08/Jun/2012 at 5:40pm
Motor??
on 2 cell it would be great
on 4 cell it may be smoke
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  Quote speedy72vega Quote  Post ReplyReply Direct Link To This Post Posted: 08/Jun/2012 at 8:26pm
You would need to run a smaller prop in order for it to work on 4S, the larger prop will draw too much current. Looking at the specs, the 4.7X4.25 prop would probably be the biggest you can run on 4S.
It is .25" more pitch speed than the one you suggested, so the plane should still be plenty fast.
Uncontrolled contact with terrain is a bad thing.
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  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Posted: 09/Jun/2012 at 8:25am
Originally posted by airwave

Motor??
on 2 cell it would be great
on 4 cell it may be smoke


Yeah that is the motor i have.. If i was to use a 3cell with a 6x4 prop would it draw to much amps for the ESC to handle?
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 09/Jun/2012 at 6:23pm
No the ESC is fine. The 6x4 would be close on 3 cell.you would smoke the motor before the esc gave in.480 watts would be ~40 amps so you would have 10 or so to spare on the ESC.
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  Quote mabaa Quote  Post ReplyReply Direct Link To This Post Posted: 09/Jun/2012 at 9:22pm
This is what my programm shows.
There is a light at the end of every tunnel….just pray it’s not a train!.
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 09/Jun/2012 at 11:47pm
thats very good, you could even look at a prop that would load it a bit more.
maybe a 6x5 or APC 6x5.5 E as the planes speed increase the wats will come down.That must be what the programe you have shows??

what does it say for 14.4 volts(4 cell) are you up over the 425~450 watt mark??
that would put your amps ~ 31

Edited by airwave - 09/Jun/2012 at 11:50pm
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  Quote mabaa Quote  Post ReplyReply Direct Link To This Post Posted: 10/Jun/2012 at 5:25pm
For a 4 cell it shows 38.4 amp and a output of 425 watt with a 6x3 master airscew.
With the 3 cell and a 6x5.5 apc, 37.2 amp and a output of 291 watt.
Nice little freeware not every prop and motor is in there but
a good base for searching and testimg.


There is a light at the end of every tunnel….just pray it’s not a train!.
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 10/Jun/2012 at 5:42pm
If you were looking for more speed i would try the 6x5.5 apc,the amps will be the part that makes heat.I take the watt rating on motors with a grain of salt.480 watts may be max but for how long and what kind of cooling??a lot of times the wire will be fine but the type magnets that are used the heat can damage and can not be fixed.if they get to hot they get weaker.
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  Quote elolz_Au Quote  Post ReplyReply Direct Link To This Post Posted: 12/Jun/2012 at 1:39pm
I placed a RCtimer 400size heli motor on my skyfun and I'm using a 2200mah 20c 3s battery.. The motor is only rated for 3s batteries, Because i don't know much about C ratings if i place a nano-tech 45-90c would it make the plane faster?

I am using a 5x5 prop as a 6x4 prop makes the motor really hot :( 5x5 seems to be its sweet spot
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