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November 21, 2018, 06:38:18 AM

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Author Topic: Which is the correct set-up?  (Read 455 times)

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Offline cheddar-caveman

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Which is the correct set-up?
« on: October 27, 2018, 09:20:04 AM »
Bear with an 80yo please, this electric drive is all a bit confusing.

The plane I'm building is a park-flyer replica of one my son flies, an old L-18C Super Cub which will weigh in at around 2lb (I hope) when built.

The drive I have comprises a Turnigy D2826/6 motor - Specs: ila_rendered
Rpm/V: 2200kv
Shaft: 3.17mm
Voltage: 2S~3S (7.4v to 11.1v)
Weight: 50g
Watts: 342w
Max Current: 34A
ESC: 40A

ESC - ila_rendered

I've got three props at the moment and they give me the following readings when run with a 2S Lipo"

9 X 6 prop - ila_rendered
8 X 6 prop - ila_rendered
7 X 6 prop - ila_rendered

I'm thinking that the 8 X 6 prop would be the better set-up as it keeps everything well within spec. Is this correct please?


Offline Alan H

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Re: Which is the correct set-up?
« Reply #1 on: October 27, 2018, 10:05:45 AM »
Weight and type of model are starting points to assess what sort of power system is required. With a kv of 2200 you are right to be looking at a 2S LiPo. Guidelines for power are around 60W/pound for vintage types and about 75W/pound for sport types. For a park flyer I an thinking around 60 to 80W/pound would be OK. So for your 2 pound model around 150W would be fine. I think your 8x6 option is the right way to go.

Offline cheddar-caveman

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Re: Which is the correct set-up?
« Reply #2 on: October 27, 2018, 12:44:45 PM »
Cheers Alan - yes it's vintage so my 8 X 6 looks to be the correct way to go. Can always change later!


Offline FrankS

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Re: Which is the correct set-up?
« Reply #3 on: October 27, 2018, 13:49:34 PM »
Try the 8 x 6, but for a slow flying plane like the cub a 9 x 5 or even 10 x 4 could also be good options.

Offline cheddar-caveman

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Re: Which is the correct set-up?
« Reply #4 on: October 29, 2018, 08:44:27 AM »
Thanks FrankS, I tried a 9 X 6 and the max current was a tad high which is why I got the 8 X 6. The plane won't be "in a hurry" when flown so I'll now wait until built and I know the weight etc.


Offline FrankS

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Re: Which is the correct set-up?
« Reply #5 on: October 29, 2018, 14:32:19 PM »
Yes a 9 x 5 or 10 x 4 will draw around 25-27 amps.


 

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