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Some questions on changing battery size

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Old 05-18-2018, 09:30 AM
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phakur
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Default Some questions on changing battery size

Hi all-

I have a plane that seems a bit over powered. I have been using a 5S LIPO (5000mah) for this 60 inch wingspan stik, but find myself flying it 90% of the time below 50% throttle while doing everything I want to do. The other 10% is less than 75% throttle including take off. While this may sound like a good thing, I need to buy a couple more batteries and am wondering if it would be better to go to a 4S rather than a 5S.

If you think it would be OK, should I:
Stick with the 5000 mah---I'm getting more than enough flying time (over 12 minutes) or would 4000 mah be ok?
Change prop size, perhaps down one inch of diameter?
Any other suggestions?

I will certainly check CG if I do end up with a lighter battery. I t would also give me a bit more room up front.

Thanks-

Larry
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Old 05-19-2018, 11:08 AM
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Quorneng
 
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If you don't need the power changing to a 5000 mAh 4s would make sense.
You would be loosing 20% voltage so rather more than that in maximum power but you are also saving 20% battery weight so you won't need as much power to achieve the same performance.
With he reduced voltage you will also be drawing less current so you could fit a bigger prop (either diameter or pitch) to restore the desired performance. .
The only practical way is to try it and see.
This sort of experimenting is very interesting but I would strongly recommend you get a Watt meter so you can measure the actual current to make sure you are not over loading the motor, ESC and battery..
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