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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Power robbing fan?
04-25-2009 08:19 PM  10 years ago
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jal250r

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Mankato, MN, US

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Power robbing fan?
I saw that compass has a newer 90 out that has a ESC ran cooling fan. Which lets you loose the engine mounted fan.

This made me think, just how much power does motor mounted cooling fan take from the motor?? Would a esc fan be worth it? Fell the power diff?
"Feed the Need to 3D"
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04-25-2009 09:02 PM  10 years ago
airdodger

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Johnston USA

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What happens when the fan stops, how do they handle the speed. When the engine speeds up the fan is in sync on an engine mounted. Next you have the additional weight of an electric motor, add to that the current draw, larger battery or more charging? Schlulter gave a power use of 15-18% of the engine in his books, bear in mind that was many years ago when engines only produced a little over one hp and fan design was not evolved.Chris
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04-25-2009 09:51 PM  10 years ago
jal250r

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Mankato, MN, US

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What happens when the fan stops, how do they handle the speed. When the engine speeds up the fan is in sync on an engine mounted
Good question maybe someone that has used one can answer that.
Next you have the additional weight of an electric motor, add to that the current draw, larger battery or more charging?
Maybe this is why its on the 90. It is a really small fan, there may be little weight diff, unsure?
"Feed the Need to 3D"
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04-25-2009 09:56 PM  10 years ago
altima1779

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Toledo, oh u.s

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I will have to take a look at that. Honestly when i flew nitro's i ran a gov. so the fan speed would not change that much. Maybe the fan already spins at a higher speed giving better cooling through out the entire throttle curve.

Things are bound to fail, you can look at any number of electronics on your heli and pray that they do not fail.

I know personally that i always just put my heli on a field charger after each flight so i wouldn't be worried about the extra draw from the fan.
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04-25-2009 10:13 PM  10 years ago
altima1779

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Toledo, oh u.s

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The video i watched said testing shows it pulls around 1.5amps. By the way it sounds it is a pretty high speed fan.
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04-26-2009 01:22 AM  10 years ago
holzback

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noblesville IN United States

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i dont understand how you would mount the fan with the shroud being there. a lot of helis need the shroud there to be built correctly
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04-26-2009 02:26 AM  10 years ago
Sillyness

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Little Rock AR

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Wonder how long it would take for the motor to cook if the fan stops working?
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04-26-2009 02:31 AM  10 years ago
fenderstrat

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Aston,Pa

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here are some pics of someone who modded a KNIGHT 50 with the ODIN fan and esc.I'll find the ODIN pics for anyone interested

http://www.runryder.com/t507602p1/
Compass helis Support Team
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Mini Titan/SE
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04-26-2009 03:00 AM  10 years ago
zaw

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Lebanon, NH - USA

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Electrics fans make a lot of difference in cars engines, I guess same goes here.

Never work with nitro engine or even seen one up close but make sense to have separate electric fans for cooling.

Now days, batteries are lighter and motor are more efficient. Motor not having to drive cooling fan it will have power to carry the battery and the fan. Also more RPM.
ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425
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04-26-2009 03:09 AM  10 years ago
fenderstrat

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Aston,Pa

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according to testing and reports from users,the fan draws around 200 mah per flightCompass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD
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