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How many watts?

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Glenn Stevenson10/04/2020 08:15:21
42 forum posts
3 photos

Ive got my old slowpoke out to see if I can improve its performance, when it was new it was pretty rapid but the esc burnt out one day and I havent managed to get it to go as well with any of the spare escs I have in my drawer.

With a 40amp esc that works in a foamy acrowot I can only get about 180 watts, The acrowot gives about 220, the acrowot weighs about a pound less than the poke so has much better performance.

Anybody got a poke that they can check the power output?

The plane is the durafly model with standard motor and 2200 3s lipo.

Thanks

Glenn

Denis Watkins10/04/2020 08:21:51
4322 forum posts
104 photos

HK have the flying weight at 3lb Glenn, thats 1380gm flying weight.

Is this similar to your Model weight?

Edited By Denis Watkins on 10/04/2020 08:22:17

Shaun Walsh10/04/2020 10:12:58
299 forum posts
49 photos

Took my Durafly Slowpoke into the garden and connected it up to a wattmeter.

On standard motor, as supplied Aerostar 40A ESC but with a 12x8 APCE prop (not the black/yellow item it came with) I got 250 watts. Even with 250 watts the performance is somewhat sedate.

I suspect the motor may need replacing.

Hobbyking say the motor is a 3648 700 KV and this was confirmed by measuring the motor in my model.

If you want to replace the motor I suggest something like the 4-MAX PO-3547-960. Dimensions look almost identical so it should be a straight swap and give a LOT more power, you will need a 50 Amp ESC on a 12x8.

I did a similar transplant in my Riot using a 4-MAX 3541 motor and the transformation was amazing, unlimited verticals on a fresh battery but of course reduced flight times if you use all the power. The original Riot motor pulled 27 amps WOT stationary, the 4-Max motor pulls 37 Amps with a commensurate increase in static thrust and yes, I did fit a 50Amp ESC.

Glenn Stevenson10/04/2020 10:36:48
42 forum posts
3 photos

Thanks just been playing with different props and a 13*6 gave me 250 watts, I tried a different motor (910 kv instead of 700kv standard) and got over 300 watts but it will need mounts modified to suit cowl.

I,l try it with bigger prop when i can get back to field, hopefully soon!

Cheers

Glenn

PatMc10/04/2020 11:28:32
avatar
4381 forum posts
524 photos

IMO a 700kv motor needs a 4s battery for a model like that. If necessary reduce the prop size to keep the current within the motor & ESC's limits.

PS you did re-calibrate the ESC when you replaced it, didn't you ? 

Edited By PatMc on 10/04/2020 12:06:12

Martin Harris10/04/2020 11:31:34
avatar
9262 forum posts
245 photos
Posted by Glenn Stevenson on 10/04/2020 08:15:21:

Ive got my old slowpoke out to see if I can improve its performance, when it was new it was pretty rapid but the esc burnt out one day and I havent managed to get it to go as well with any of the spare escs I have in my drawer.

With a 40amp esc that works in a foamy acrowot I can only get about 180 watts, The acrowot gives about 220, the acrowot weighs about a pound less than the poke so has much better performance.

Anybody got a poke that they can check the power output?

The plane is the durafly model with standard motor and 2200 3s lipo.

Thanks

Glenn

A couple of thoughts...

Have you retrained the ESC to the throttle channel and checked that the throttle channel is set to 100% on the Slowpoke transmitter programming? An ESC shouldn't limit the available power at 100% because it's a different rating (unless it's being operated above its rated power, when it won't last very long!)

Are you using the same battery in the Acrowot? The process of burning out the original ESC could have damaged the battery if it's a different one.

Glenn Stevenson10/04/2020 12:11:25
42 forum posts
3 photos

I will try it and see what happens, if it doesnt work well then there will be some swapmeets one day and it will get me a few bob to buy some lovely glow engines.

Electric is not that satisfying as banging a big engine in and having fun.

Keep safe everybody

Glenn

Martin Harris11/04/2020 20:59:20
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9262 forum posts
245 photos

Now you're talking!

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