An 11 x 5 will put you right on the limit of the max amps, 21A but will give you 215 watts of power which would be good. You would need to limit your full power motor runs so that you do not overheat the motor but on a glider this is usually the way you fly them. Full power climbs up to height then a nice gentle glide down.
Aleleo, it depends a lot on the weight of your airplane and the speed you want to fly. I use a 8x3.8 SF prop and it draws about 6.5AMPS at full throttle on 3S. When I use a 8x5TGS the electric consumption goes to 12Amps on 3S lipo. with the 8x3.8 I get 37minutes of normal flight on a 2200mAh batter flying the Skywalker falcon wing (1340mm EPO wing, with flying weight of about 600g).
hi aleleo, you can use 8x4.5 prop with a 3s 1300 mah lipo.
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I have 3 of these total... two in a Multiplex TwinStar and one as a backup. They're fantastic motors for the price. I run 8x6 APC electric props on them (not the SloFly models, the standard electric props) and they always come down cool. 9x6 prop stressed them a bit. 8x6 was the sweet spot. Efficiency is awesome on these, too. I can fly for about 15 to 20 minutes and only use 1100mAh on my 2200mAh packs. Great stuff!
no problem yet. mine have 1.5h flight time now and still running strong. using lipo 3s 1300mah and a 9:6 prop, only need half trottle on my 1kg beaver.
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Tested this motor with a 10x4.7 slow fly prop, 30 amp esc and 3s 20c lipo battery. I was quite skeptical about this motor due to the bargin price. Anyway, here are my results:
180 watts and 18 amps
The motor gets warm at full throttle. Yet, I never need to use full throttle. This motor is powerful. It is also a smooth and quiet. My other motors aren't as smooth. My slow stick flies with a viciousness now. It gets up high in no time. The motor comes in a plastic case with a prop adapter, mount and information. The cost is under $8, yet it feels like a quality built motor which includes information. I curious to see the lifespan of this motor. Be certain to solder the bullet connectors on well or the motor will stutter like mine did. I had to re-solder the connectors again and it worked. I really like this motor!!