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-   -   Lehner 1950 KV Rateings? (https://www.rc-monster.com/forum/showthread.php?t=5803)

jhautz 02.22.2007 10:08 AM
Lehner 1950 KV Rateings?
 
How come the kv ratings for the 1950 motors are diferent on the RC-Monster store vs. the Lehner website? Anyone know which is correct? The lehner site has a slightly lower kv rating than the RC-Monster store.

http://www.lehner-motoren.com/ms19.php?la=en

http://www.rc-monster.com/proddetail...LMT1950&cat=20

Dafni 02.22.2007 10:43 AM
Looks like Lehner changed the numbers slightly. I remember them being the same as on Mikes site. I may be wrong, though.

Anyway, the loaded KV (at max efficiency) depends on a lot of variables, not the least being the ESC used. Regard them as a guidline, not a solid number.


PS: if you have a motor over- or underloaded, it might have a huge impact on the final rpm.
I hope to get the Brushless RPM Sensor from Eagletree soon, to see how fast they really spin at WOT. Should be interesting.

DAF

Procharged5.0 02.22.2007 11:05 AM
Quote:
Originally Posted by Dafni
Looks like Lehner changed the numbers slightly. I remember them being the same as on Mikes site. I may be wrong, though.

Anyway, the loaded KV (at max efficiency) depends on a lot of variables, not the least being the ESC used. Regard them as a guidline, not a solid number.


PS: if you have a motor over- or underloaded, it might have a huge impact on the final rpm.
I hope to get the Brushless RPM Sensor from Eagletree soon, to see how fast they really spin at WOT. Should be interesting.

DAF
Agreed! It would be very helpful if the parameters used for the "load" were specified. Otherwise it's not terribly useful other than for general comparitive reference.

Dafni 02.22.2007 11:59 AM
They are, somewhat. It says "at max efficiecy" and 30° motor timing.

Procharged5.0 02.22.2007 12:01 PM
True, but what is "the load"? I've yet to see it specified.

BrianG 02.22.2007 12:36 PM
Quote:
Originally Posted by Procharged5.0
True, but what is "the load"? I've yet to see it specified.

Somewhere between unloaded and stall. ;)

Dafni 02.22.2007 12:48 PM
They use big propellers, every motor-size has a corresponding propeller size. But that's all I know.

Procharged5.0 02.22.2007 01:44 PM
Quote:
Originally Posted by BrianG
Somewhere between unloaded and stall. ;)
Nice! :005:

Procharged5.0 02.22.2007 01:46 PM
Quote:
Originally Posted by Dafni
They use big propellers, every motor-size has a corresponding propeller size. But that's all I know.
I


I had read something like that. I think they use a particular prop size "Per Series".

Dafni 02.22.2007 01:53 PM
Yeah, that's what I wanted to say :)

Serum 02.22.2007 04:04 PM
I understood it reading the first post.. must be a foreign thingy.. :)

If you take a look at the www.bk-electronics.com site, the number are the same as Mike used on his site.

jhautz 02.22.2007 05:21 PM
I know its not alot different, but it just got me wondering why they had it rated differently in different places.

tallyram 02.22.2007 09:59 PM
lehner's kv numbers have been different from bk's and mike's numbers for a few months now. i thought everyone already knew that so i didn't mention it in a few posts, lol.


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