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Electrify 1/4 scale Super Cub

Old 07-16-2013, 08:43 PM
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silvernut
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Default Electrify 1/4 scale Super Cub

I have a Top Flite 1/4 scale Super Cub powered very adequately by a Laser 150. Wishing to go entirely electric I want to determine just what motor I will require in respect of Watts output. I have not so far succeeded in establishing the Wattage of a Laser 150 which will help when I do!
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Old 07-16-2013, 08:55 PM
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firemanbill
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I am flying a Pilot One 1/4 scale Piper PA-12. It has a 110" span and weighs about 7 lbs or so. I use the Cox 5030/18 Outrunner on an 8s Lipo's. (2x4s 5000mah in series). If I remember correctly I'm getting about 2500 watts out of it.

She has more than adequate power and flies like a dream.

[media]http://www.youtube.com/watch?v=1liIwTPCx9I[/media]
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Old 07-20-2013, 11:11 PM
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AEAJR
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Originally Posted by [email protected] View Post
I have a Top Flite 1/4 scale Super Cub powered very adequately by a Laser 150. Wishing to go entirely electric I want to determine just what motor I will require in respect of Watts output. I have not so far succeeded in establishing the Wattage of a Laser 150 which will help when I do!
Forget the wattage of the Laser 150 which I presume is a glow or gas motor. That is not a good approach.

What does the aircraft weigh, all up, loaded with fuel?

What kind of performance are you looing for. Gentle scale? All out aerobatics? 3D?

Read this:

EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT
http://www.wattflyer.com/forums/showthread.php?t=31368


Read the chapter on sizing electric power systems.
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Old 07-20-2013, 11:51 PM
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1geo1
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I am new here- (just registered today ) but you are asking one of my questions !
So forgive my noobness- but I love to build and want to undertake a 90"
n3- pup scratchbuilt- I enjoy the construction but the new power has me baffled....
When I left the hobby 20 yrs ago the pt- electric was the thing- how about that motor now- LOL- what i remember- overbuilt/ overweight/ overkill- for the time.
What I see according to todays standards with a new motor- pretty good- anyway
I will follow post and maybe get my answer, in the meantime just HELLO !
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Old 07-21-2013, 12:20 AM
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CHELLIE
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Originally Posted by 1geo1 View Post
I am new here- (just registered today ) but you are asking one of my questions !
So forgive my noobness- but I love to build and want to undertake a 90"
n3- pup scratchbuilt- I enjoy the construction but the new power has me baffled....
When I left the hobby 20 yrs ago the pt- electric was the thing- how about that motor now- LOL- what i remember- overbuilt/ overweight/ overkill- for the time.
What I see according to todays standards with a new motor- pretty good- anyway
I will follow post and maybe get my answer, in the meantime just HELLO !
Hi HELLO and Welcome to Wattfliers, here are some plans for the rc n3-pup plane with a 90" W/S, and a 60 to 90 size E Motor. Take care and have fun, Chellie

http://www.airagestore.com/plans/rc-...rs-n3-pup.html

here is a very good 60 to 90 size electric motor combo that wont break the bank for $99.99

http://www.graysonhobby.com/catalog/...0gsvvd2jcstir4
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Old 07-21-2013, 12:41 AM
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1geo1
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how sweet- thank you !
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Old 07-21-2013, 12:42 AM
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1geo1
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and, yes, I knew about the plans- was trying to find original article for flying weight, etc. think ill e-mail them- thanks again !!!



This just keeps getting better !
Finally my dream may come true

Last edited by 1geo1; 07-21-2013 at 12:44 AM. Reason: forgot info
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Old 07-21-2013, 01:52 AM
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kyleservicetech
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Originally Posted by [email protected] View Post
I have a Top Flite 1/4 scale Super Cub powered very adequately by a Laser 150. Wishing to go entirely electric I want to determine just what motor I will require in respect of Watts output. I have not so far succeeded in establishing the Wattage of a Laser 150 which will help when I do!
You will want about 100 to perhaps 130 watts per pound of airplane to take off and fly well. Might be able to fly on less power, but I'm one of those that likes to have more power than needed.

Years ago, I had a 1/4 scale Piper Cub that was powered by a geared brush type Astroflight 90 motor, and 38 nicad cells. The power system turned a 20X10 wood prop at about 5300 RPM. Yup, it was heavy, but that old plane would still take off in about 50 feet.

Nowdays, you've got those Lipo batteries that weigh perhaps 1/3 of what an equivalent Nicad pack would weigh. Plus those brushless outrunner motors that can and will run circles around those Astro brush motors.

I've got two giant scale models powered by those $$$$ Hacker motors. Both of them fly very well. (And they are NOT underpowered!)

Giant Scale Power System:
Battery Backup System
http://www.wattflyer.com/forums/showthread.php?t=63794

Carl Goldburg Extra 330 Electric Conversion
http://www.wattflyer.com/forums/showthread.php?t=59273

Giant Scale electric motors vs Gasoline Engines
http://www.wattflyer.com/forums/showthread.php?t=58035

Great Planes Giant Big Stick Electric Conversion
http://www.wattflyer.com/forums/showthread.php?t=65052

Giant Scale Cessna Model
http://www.wattflyer.com/forums/showthread.php?t=66414
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