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Tug towing

It depends what diameter and length your 800kv motor is (ie 2836, 3548, 4240, in-runner or out-runner etc) and the min and max voltage ie 2cell, 3cell 4cell etc - (8v 12v 16v - for practical purposes) If you want to run a bigger prop use a lower voltage and a smaller prop, a higher voltage. Both in runners and out runners will get hot if you run them slow, and with both in boats (as DG mentioned previously) water cooling is really advisable. In-runners have cooling jackets and fans available and out-runners have water cooled front plates available. The larger the diameter and length of the motor generally the more torque is available (longer motor=more windings, longer rotor, more torque) bit like a 4cyl and 6cyl petrol motor. Your choices with electrics are endless. You should only need a 30A ESC (I use the Hobby King 30A car ESCs (these have a cooling fan output if you find you need one) in my HSL (2x 2845 2000kv brushless in-runners,- 1 ESC per motor on 2cell 2200mah LiPos ) and they don't even get warm (30mm 3 blade props with a high pitch - around 40mm I think - Chinese from AliExpress and very good AND cheap. Choice of prop size and pitch is also a matter of experimentation. No good running a large diam (say 50x20) prop at 16000rpm when you could run a 30x40 prop and get more thrust, (if you get my drift) better to run a at 5000 for eg. Hope there is something of use here. Have posted some eg s of cooling types (silver one is o/runner front plate cooler) and the 30A ESC mentioned.

5 years ago by jbkiwi