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Sep 29, 2019, 07:24 PM
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Functioning Tach




Time to check some motor prop combinations .

Brushed 8520 on the 450x wing .

30,000 rpm static Im calling it 30 , it went a little higher . So it should wind out more in the air .
Certainly explains why it's a little noisy .

1103 on the 450x wing (2s)
prop is a 3.8x3
And around 50% throttle I saw 12,000+ rpm
At full throttle ( motor cooks ) I saw a peak of 17100 rpm
For a 8000kv motor , this certainly explains why the motor is cooking ..

6A+ / 17100 rpm / 8000kv = Over proped !
If you do the math , Voltage x KV = RPM
4v x 8000kv = 32,000 rpm ( potentially on paper ) 20 something would be more realistic .
Oh man ! What was I thinking .. It's 2s ...
8v x 8000kv = 64,000 rpm ... So 40 something K would be more realistic ,
I have ordered more props , I think they are 3x2 or some such ( smaller anyways )
Will be cutting down one of the props included in the kit , I will cut and cut till I see a 5A peak .

It's good to have a functioning tach !

UPDATE

The 2nd 1103 just died !
Looks like no more 1103 for me ..
I ordered a 1105 and a 1106 ..
And I thought this Wing might be Budget , the budget is Blown !
Last edited by old4570; Sep 30, 2019 at 04:49 PM.
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