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  • June 13, 2025, 03:59:29 AM

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Author Topic: BA3515 vs BA3520  (Read 1068 times)

Offline frank williams

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BA3515 vs BA3520
« on: June 05, 2025, 07:12:33 PM »
What would be the advantage / disadvantage to running the 3520 instead of the 3515?
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Offline Brent Williams

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Re: BA3515 vs BA3520
« Reply #1 on: June 05, 2025, 10:16:05 PM »
The BA3520 is 5 more than the BA3515.  H^^

Both motors are very powerful.  It might come down to which timer system you are using and the weight of the model. 
I have heard some scuttlebutt of folks using the BA3520 with Igor's newest timer variant and a particular version of Igor's props. 

The BA3520 is ~8oz and the BA3515 is ~6.5oz.  A 1.5oz weight change at the end of the nose might be compelling enough to select one over the other as needed.
« Last Edit: June 05, 2025, 11:19:06 PM by Brent Williams »
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Offline Igor Burger

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Re: BA3515 vs BA3520
« Reply #2 on: June 06, 2025, 12:33:45 AM »
Quote from: frank williams on June 05, 2025, 07:12:33 PM
What would be the advantage / disadvantage to running the 3520 instead of the 3515?

Exactly the same difference as any other motors of the same type and different weight. Larger motor has more iron loses and less copper loses. Since they have to be equivalent for good efficiency, result is, that the larger is better at higher power and smaller is better at lower power.

Since we are overloading our motors, the larger is probably (depends on power you use) better, but you carry more weight (needs more power to fly  VD~ )
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Offline frank williams

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Re: BA3515 vs BA3520
« Reply #3 on: June 06, 2025, 07:06:12 AM »
Brent, Igor
Thanks for the reply /info.
I assume battery usage might be up too. ... but for a given plane it takes the same amount of energy to fly with one or the other .... just the internal losses being different...... straight and level flight, same prop, anyway.  Maneuvering flight, ....  maybe, the 3520, if the 3515 is stressed.
Frank
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