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Old May 01, 2013, 08:00 AM
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United States, OH, Columbus
Joined Sep 2012
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Equivalent electric motor to a .061 gas engine?

Looking to switch my 1/2a model over to electric and wondered what electric motors people are using?
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Old May 01, 2013, 08:24 AM
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Canada, BC, Vancouver
Joined Sep 2006
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It depend which .061 engine, there is a big difference between a ASP .061 and a Fora/Profi/Cyclon .061! Here is the power in Watts of most Cox engines(.049/.09)
Beside equivalent power, electric and glow have different characteristic but any electric motor able to swing the same size prop as a .061 glow at equivalent rpm will do.
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Last edited by coriolan; May 01, 2013 at 08:31 AM.
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Old May 01, 2013, 08:58 AM
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USA, TX, Grapevine
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Usually it is something with a 350, 380, 400 to 480 size electric motor to match a .049 to .07 displacement type of glow engine. The brushless outrunner motors turn much larger props and the inrunner style motors tend to use the same size props that the glow engines use. A smaller lightweight1/2a plane would work with the 350, 380, 400 size motors and the high performance or larger 1/2a planes would use the more powerful motors or course. The battery would likely be a 800, 1000 to 1300 mah 3 cell Lipo. Depending on the motor a 10 to 20 amp or 30 amp ESC would control it.
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Old May 01, 2013, 11:10 AM
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United States, OH, Columbus
Joined Sep 2012
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Thanks the motor thats being replaced is a norvel .061. The motor will be going on this model.

So based on the info given some thing like this would be suitable?

That would produce 11,160 rpm at 12v.
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Old May 01, 2013, 11:12 AM
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South Africa, GP, Johannesburg
Joined May 2012
436 Posts
There are lots of choices, but I've had a lot of success using the very cheap red E-max CF2822 and CF2812 bell style motors (seach on hobbyking for FC28-22 or FC28-12...for some reason the letters are switched or try this link: https://www.hobbyking.com/hobbyking/...er_1200kv.html). Specs also attached. They have far more power than the old TD051, so should be a close match to the 0.061 (which was not much more powerful than the 051 if one added the silencer anyway!). At around USD7 each they are also dirt cheap. The 2812 turns a smaller prop (7" x 5" is a good match) at higher rpm than the 2822, so is probably a closer match to a glow engine and suitable for a faster plane. However, the 2822 allows an 8x6 or even 9x4.7 prop which is great for a trainer (I use one on my old Q-Tee and 6" glider and get great performance). They are also popular rewind candidates (see thread in electric motor section of RC groups)

The smaller Hobbyking Gold 28xx series would also work well - Try this one if you want loads of power and speed (https://www.hobbyking.com/hobbyking/...ner_Motor.html), this one for something inbetween (https://www.hobbyking.com/hobbyking/...ess_Motor.html) or this if being overpowered is not your thing: (https://www.hobbyking.com/hobbyking/...er_1450kv.html).
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Old May 01, 2013, 11:18 AM
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South Africa, GP, Johannesburg
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Just seen your last post and the model - E-max 2812 with a 7x5 or 7x6 prop and 25A ESC should be fine for that. Use the Hobbyking 2826/6 2200KV with a 6x4 prop and 30A ESC if you want a rocket!

Your proposed motor is much the same size as the first two hobbying ones, but I'd look for a higher KV version..930KV is better for a slow flyer and the model calls itself 'sport'.
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Old May 02, 2013, 10:38 AM
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United States, OH, Columbus
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Thanks for the info I will probably go with some thing in between having never even flown the thing before.

Right now I'm flying helicopter and multirotor.
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Old May 02, 2013, 11:12 AM
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Canada
Joined Nov 2000
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I've used this motor :
http://www.rctimer.com/index.php?gOo...3&productname=
And this motor:
http://www.hobbyking.com/hobbyking/s...or_1500kv.html
Both motors on 2 S happily spin a 7 x6 prop allowing Straight up verticals on a 7/8 ounce model.
3S battery is Fine to 10 ounces.
The slightly larger gold one is a bit more power but it's main advantage is that being heavier, it is useful as balance in a tail heavy model
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Old May 05, 2013, 09:05 PM
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A modern 80w outrunner will put out more RPM and Torque then a a TD 051.
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