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Old 12-09-2007, 12:09 PM   #1
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Great Planes Lancair electric

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I have a Great Planes Lancair, and I want to upgrade the stock motor and battery to a brushless motor and lipo batteries. It currently flys like a brick on the stock parts, and an upgrade will make fly better (I hope) I was talking to a fellow this past summer who had upgraded his Lancair. He mounted a Helimax motor, however, I lost the note that I had made of the model number. I guess my questions would be:
1. what size motor
2. direct drive, or gear box (stock?)
3. will this fit in the cowl?
4. lipo battery size

I'm just getting into the electric side of our great hobby, I flew a stick and tissue 1939 Dallier Sportster(I guess thats how its spell) on speed 400 and three channels over this past summer, and I had lots of fun with it , even in the wind.
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Old 12-11-2007, 11:41 AM   #2
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Unless you want to do 3D flying with this plane, a full brushless upgrade may not be necessary.

The ESC that comes with the Lancair is lipo-compatible (according to the GP site). Simply upgrading to a 3s lipo and adjusting the prop may give you the performance you want, for considerably less shell-out.

The Speed 400 motor that comes with the Lancair can handle about 10-11 amps... the stock setup would appear to be pulling less than 10A. Changing to a 3s lipo and a 10 x 8 prop will give you about a 50% increase in power.

Of course, these are just computer modeled figures, you'd have to test it a bit (just watch the motor temp). If you have a power meter, it'd be even better, you can fine-tune the power of the system much easier that way.
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Old 12-11-2007, 12:57 PM   #3
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ACtually, you do need a full upgrade, the supplied power system is junk. Upgrading with a 3S lipo will fry the motor in a couple of flights, mine lasted only one flight.

You need somthing close and similar to Park 450 and 3S lipo around 1300 to 1500.

If you fly off grass, the landing gear is not upto the task, however, with brushless upgrade, it can be hand launched easily, the plane flies and looks awesome in the air, but has to be flown fast, as it is a small wing area for the weight.
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Old 12-11-2007, 01:45 PM   #4
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I bow to actual experience.

I've never used the GP brushed motors... but you can get quite a bit of life out of a quality Speed 400 motor on 3s (Graupner, Kamdax, etc).

Unless the plane came with a mount for an outrunner, you might be able to put an inrunner in the gearbox. Working the calc again, a Park 400 4200 kV inrunner, geared 3:1 (stock gb) on a 6 x 5.5 prop, with a 3s 2100 will give you about twice the power you have now.
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