What size brushless motor should I use

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4 years 5 months ago #20935 by
So as it's raining thourght I get this plane ready for its first flight but unsure what motor I should use .. I do have a small selection please see the photos and feel free to leave your suggestions
Many thanks Dan
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4 years 5 months ago - 4 years 5 months ago #20937 by Phil Ford
Replied by Phil Ford on topic What size brushless motor should I use
Wingspan and estimated weight would help? You have two motors there (EFLM and a SK3) with 1250kv (750 watts) on 4 cells. Equivalent to a 0.25 glow engine. These would swing 10 - 12 inch props on three cells happily On four cell lipo you would be down to 8 -9 inch props. The model looks very light so a three cell powered motor would be about right. the other motors are in the 22 mm to 28 mm can size and would possibly do but the larger motors would help any CG balance issues.

The AXI is about 920 kv 3 - 4 cell. The little 2212-09 without knowing KV but around 2 - 3 cells max power approx 200 watts.
Last edit: 4 years 5 months ago by Phil Ford.
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4 years 5 months ago #20939 by 4Pedalsfly
Replied by 4Pedalsfly on topic What size brushless motor should I use
Dan - Adding a bit more info to Phil's posting.
Pic attached of now deceased Fokker D VIII - wingspan 48 in weighing 3ib 5 ozs.
This had a BRC hobbies motor A2814-8T , 1000 kv with a 3S 2,200 LiPo & a 11 x7 prop
gave 300 Watts which worked out at 87 Watts / Ib
If you aim for a setup which will give around 100 Watts / Ib max, it will be suitable for your model.

Colin.A
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