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You're averaging 1410W and have a peak of 2742W? That 1515 motor of yours can take it I'm sure, but the Leopard 4082 doesn't seem so unrealistic anymore...
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And OSE even has a custom 4082 in the same 2200 Kv, Y-wind motor like you have now. See, I'm helping you spend money
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Yeah cheers
I probably will order it a bit closer to home though as I live in the UK and customs charges from OSE is pretty bad. I know a vendor who should be able to give me a good price on a new one.
Everything that has a beginning, has an End
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I bought a Leopard 4092 + free water cooler from OSE a few weeks ago & it was much cheaper than getting in the UK, i paid £94 in total inc shipping & didnt have to pay any customs. To get this in the UK was around £134, as it happens they didnt have the kv i wanted or the longer 68mm water cooler so i had no choice but to get from OSE. Glad i did in the end as its a fantastic service that Steven offers.Comment
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The 4082 - 2200kv my be a custom wind as Leopard dont list this motor the same as the 4082 - 1800kv that OSE sells.Comment
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Everything that has a beginning, has an EndComment
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I dont have the box as i threw it away so dont know what it said, i was just pleased i didnt have to pay anything on it.Comment
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That would be my guess too, as the last three motors he lists say:
1800 Kv/rpm per volt. Custom wound for OffshoreElectrics
2000 Kv/rpm per volt. Custom wound for OffshoreElectrics
2200 Kv/rpm per volt. Custom wound for OffshoreElectrics
So martin, what do you think of that motor? I know we're getting off topic here on the LiPo batteries, but it gives us something to talk about while Drax is doing more research on his problem.Comment
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One more thing, although minor, is that you might get a little cooler run on your motor if you back the timing off a bit. The default on the SeaKing is 15 degrees; I run mine at 7.5 degrees. I have not measured it so I can't give an exact number. But most forums and Neu/CC themselves say the same thing; you don't need a big timing advance on those motors. Maybe you did this already.Comment
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Ive not run the motor yet.Comment
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Well, that would explain why 15 is the default then.
In Drax's and my case (which is why I mentioned it), Neu recommends 15 degrees maximum on the Y and 10 degrees on the D. From the Neu web page FAQ with CC ESCs:
"For most uses the low advance setting is best—motors have better efficiency. “Y” wind motors can use medium advance for a little more power or speed. “D” wind motors should always use low advance as there is no improvement with higher advance settings."
If I can paste links in here from another forum's discussion, VintageMA has some really good points on why you don't need 15 degrees. At least on the 1515 motor anyway (I'd recommend reading the whole thread; it's not that long):
In reality, it'd be fun to have an Eagle Tree with temp sensor and GPS. Glue the temp sensor to the motor with Arctic Silver Adhesive; then try various timing settings to see if Neu is correct. That's too much work though, I'd rather be boating.
Last edited by Krusher; 05-15-2012, 01:17 PM. Reason: Added recommendation to read whole linked thread.Comment
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I read the whole thing. Sadly there is plenty of poor info in that thread. Boats are not cars. Any motor needs a certain amount of timing advance depending on the physical characteristics of the motor and the load placed upon it. BL motors and brushed motors are the same in this regard. Because boat motors virtually always pull a higher load than cars or planes, their timing requirements are different. The higher the load, the more advance required to maximize efficiency.
Advancing timing can increase performance and efficiency, on Wye winds at least. Of course there is such a thing as too much, but within limits set by load and design you can do better with more timing. Last Fall at the LA SAWs I was running a 1515/1Y in my Q cat. By advancing the timing from 15* to 20* I gained almost 4 mph with no noticeable increase in amp draw. That tells me the motor was running more efficiently with the advanced timing. At speeds over 80 mph, an additional 4 mph is not a tiny increase in power either. Of course I was pulling over 200 amps, running 20* advance in a 100 amp setup would be a very BAD idea. Again, timing advance has to match the motor design and load. Try different advance settings and see which is right for your particular motor and load. Too little can be as bad as too much.
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I'll agree with you on that; I'm not saying every application is the same and we should try different things to see what happens. I couldn't tell any difference in speed or temp on my 1415 from 15 to 7.5, but all I had was my GPS and a non-calibrated finger lol. I do like the Castle comment from the president however. It just basically says to take it easy and that more is not better unless you have a reason for it.
So FWIW, backing off the timing on Drax's setup will likely only make a significant difference if he is already over 15 degrees. Once I get my charger back I can do some experimentation myself (on top speed anyway).Comment
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