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Sep 17, 2019, 08:09 AM
Flying a Falcon or a 3D model.
fauconnier's Avatar
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Smal pattern motor

I bought a World Models Spot on 50, and I want to fly it electric. I like my 3D planes to fly at 200/250W per pound. What is the standard in F3A pattern flying ? Do you think 150 W/pound is enough ? 200 ?
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Sep 17, 2019, 02:17 PM
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I have been flying a 6 lb model on about 1100 watts which seems to be adequate. In some respects it depends on the sequence you would like to practice, the lower classes would require less power. I fly advanced and the model has adequate power to handle the sequence on a 6 lb airplane. I use an AXI 4120/18 spinning a 16x10 carbon Falcon prop. I use a 4000 mah, 5S pack for power. The intent is to keep things light.

The Spot On was no designed for electric so I think that you will have some work to do with the conversion.

Good luck,

Sep 18, 2019, 04:27 AM
Bo Edstrom, Sweden
I friend of mine in the RC club has a Spot on 50, with a Saito FA-56B 4-stroke.
It flies OK with this. I know (and have seen it with my own eyes) he had some wierd problems with rolls with his plane. If I remember it was just in one direction. It was repeatable. Sorry I do not remember more about this. But in general this plane flew great. The owner do not fly any F3A schedule with it, just some sport flying with some loops, rolls and such.
There is plenty of space in the Spot on 50 fuselage in the tank area, where a LiPo battery easily can reside if center of gravity permit. This can be seen in the manual:

Spot on 50 has a flying weight (according to manual) of 2650 gram / 5.8 lb.

If You do not need very good vertical performance I Think I would settle with 5 cell LiPo, and a "50-seize" electric motor (like Hacker A50-14S or similar) and about 4000-4500 mAh LiPo. And maybe APC 16x8E or 16x10E prop and a 70-90 amp ESC.
Here is the spec (kv. watt, weight, etc) of a Hacker A60-14S so You can see that and have something to compare with:

About 1100-1200 watt of Power on full throttle seems about good for such plane as Spot on 50. Then You have plenty of power, You do not need all that power of course for cruising around but if You fly a Schedule You want the extra power in more powerhungry vertical manouvres.

Good luck with any electric conversion of such plane.

Last edited by bossee; Sep 19, 2019 at 02:00 AM.
Sep 18, 2019, 06:51 AM
Registered User
AJ has a motor for the smaller Acuity i had in my Acuity and it was really nice. I flew 6s but it would still be plenty on 5s
Sep 18, 2019, 04:51 PM
Flying a Falcon or a 3D model.
fauconnier's Avatar
Thread OP
Thank you guys.

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