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F.s. (2) lehner lmt 3080lk 5 wind
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I would say in a larger mono, bigger than 40" a 455 or 460 would be a good choice. I had a 45" Hydro with both of those props and a 780kv motor on 10s. Anything smaller in hull size is overkill I think. I cant remember the formula to figure out the kv in WYE(STAR) vs Delta. I have it here somewhere. If I find it, I'll post it, or maybe someone can chime in. In any case, when changing from Delta to WYE(STAR) the KV drops to allow for more voltage.Comment
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Please someone correct me if this is wrong.
Delta KV divided by 1.73.
So 1050kv / 1.73 = 606.94....
14s = 3.7 x 14 =51.8v...
So 51.8v x 607kv= 31,643 rpm
or
10s = 37v
37v x 1050kv = 38,850 rpm
OR
depending on how you represent battery voltage
@ 3.7v or 4.2v (discharged vs fully charged battery)
14S = 4.2v X 14 = 58.8v
58.8v X 607kv = 35,691 rpm
or
10s = 42v
42v x 1050kv = 44,100 rpm
You need a VERY good speed controller.Last edited by jj2003; 01-08-2017, 02:01 PM.Comment
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Don't use 4.2 volts for this type of calculation, the motor never sees this voltage under load. 3.7 is a better average loaded voltage although a bit low. Kv x volts does not provide loaded rpm, this is heavily influenced by motor and ESC efficiency, and pack quality. IME a better formula for estimating loaded rpm with loads around 150 amps is:
Kv x 3.7 x 0.85 = loaded rpm
Again just an estimate, but more useful than Kv x volts
To leandre - if you want to run 10S to 12S the Delta wind is not the way to go. Wye wind Kv is about 600, so on 12S expect a loaded rpm around 23,000. An x460/2 should work well, as would an x455/3 on a correctly trimmed mono from 40-45" long.
.Last edited by Fluid; 01-08-2017, 04:04 PM.ERROR 403 - This is not the page you are looking for
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You do not run this motor in a 40-45 mono. Its to heavy...
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Oh and I know a guy who runs a single 3080/9 (583Kv) in a 67" mono turning an X470 on 12S2P...just to give an idea of what these motors are capable of.
mono_lmt_3080_113.jpgmono_lmt_3080_105.jpgComment
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Keep in mind too that Lehner's are rated "under load" for Kv bringing final rpm up noticeably.
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