Lehner Motors

[ncornacchi]

My new hpr115 is shipping next week! I asked Hanspeter what would be a good powerlant for his boats, and he said that 6S is recommended with a Lehner 40/50 7-turn.....Does anyone know how to cross reference this motor to a Nue style motor?

[RaceMechaniX]

Probably a 1940 or a 1950 7 turn motor. A Neu cross reference would be aronud a 1515 to 1521 in the appropriate wind. Or a Castle/Neu 1518 to 1520.

Tyler

[ncornacchi]

Thanks Tyler, Do you happen to know the RPM stats on the 1940/ 1950? I've searched the lehner sites, but they are not in english....I thought it would have been more like the Nue 22-series

[blackcat26]

Here is the chart from their site.

[NativePaul]

The lehner website is in English too.
A 1940/7 is 2239KV weighing 290g
A 1950/7 is 1791KV weighing 350g
Neu motors are 4 pole instead of Lehner's 2 poles and as such they naturally have much bigger gaps between the KVs even using both Y and D winds and half turns, so there may not be any exact matches but they are both very good quality, very efficient motors and picking one with the same mass and close in KV should yield similar results even if the props needed are slightly different, the rough equivalents would be
A 1512/2.5d 2050KV weighing 280g
A 1515/2d 2050KV weighing 340g or
A 1515/2.5d 1650KV weighing 340g
The next size up is a 1521 which is a much bigger motor capable of a lot more power but weighing a lot more too, a 1521/1.5d is 1900KV weighing 480g.

You say a motor rather than motors,I dont know whether that was a slip of the finger, but I would guess Hanspeter's suggestions are for a pair of motors in twin drive configuration based on the size of the motors vs hull, if you are after a single a 1527/1.5d 1500KV 618g motor would be more suitable.

[johnson22456]

I'm going to run neu 1521 1.5d motors in mine. Old man has this setup in a hpr 115 on 6s and x477 props and it runs in the 80's.

[ncornacchi]

It will be twin screw.....Thanks for the input guys.....Good cross reference Paul! I'm running 1515 1Y in my UL's and they are bullet-proof...but, I didn't think they'd have the punch, but of course, I'm moving up from 4S to 6S....I wonder if Lehner also carries water jackets or if I'd have to match up the dia to a Kintec or OSE jacket

[RaceMechaniX]

Lehner does carry jackets for their motors. The 19xx series use a 36mm can which can also be found on t OSE. The 22XX series uses a larger cooling jacket.

TG

[Skipster]

thanks to NativePaul

my favorite Lehner a 1930
went belly up this summer
cogs like crazy with several ESCs

You website will prove most excellent

I also lost a LMT ESC I used with that motor
maybe they will service both?

Has anyone from the states sent them an item for repair?

[ncornacchi]

OK, So I've decided to go Lehner....This boat deserves it....It looks like the 2250 5-wind was the better fit on 6S, but Hanspeter did suggest 1940 or 1950........Do you think I'd be heading in the wrong direction in thinking 2250? Also, the LK version looks much better than the Hi-Amp version, should the LK still be water-cooled? I thought that Lehner had internal cooling, but maybe not....It's a big investment to me, but I want to do it right, any input from you guys is appreciated...

[Gerwin Brommer]

2240/8 on 6S and Andy Browns Octura's X447, and you'll smile from ear to ear !!
LK's always are High Amps !
Yes, watercoolingcans are needed !

[ncornacchi]

Thanks Gerwin,,,I was hoping you'd chime in.....been watching closely the other threads and you have been giving sound advice...You seem to know the HPR's very well...would love to spring for shultze's, but I think the castle 240HV's would handle the 2240's

[Steven Vaccaro]

Thanks Gerwin,,,I was hoping you'd chime in.....been watching closely the other threads and you have been giving sound advice...You seem to know the HPR's very well...would love to spring for shultze's, but I think the castle 240HV's would handle the 2240's

Wait for the hydra ice to come out. You and I wont see much moving water for a couple of months anyways.

[ManuelW]

Hello,

LMT 1940/7 as well as LMT 2250/5 are in my eyes WAY too much for you. I use the LMT 1940/7 in my own HPR06 and even on 5S it runs >90mph. For SAW use I ran it with 1x 6S on both motors with a best heat of 97.5mph. This year I might try again a run with 2x 6S Lipo and I'd expect it to run over 105mph and thats a lot I think. Also this motor is quite small and light, you have to be aware not to exceed the limits.

Overall me and my friends from the PBS Passau ran more than 10 HPR06 with different setups, what I can recommend is LMT 1950/7 on 6S, Gerwins propose of LMT 2240/8 on 6S is even better in my eyes but we have not testet this combination yet. With both setups and X447 props from octura you'll be able to expect top speeds around 90mph.

LMT (Lehner Motoren Technik) offers nice "hardware" for the motors, this includes water jackets as well as the so-called "Aufschwinghalterungen". I'd recommend them especially for the LMT 1950 series with air cooling. Also the air-cooling is a feature which I'd recommend but use a watercooling as well. Only air cooling is not sufficient for these motors.

Best regards,
Manuel

[ncornacchi]

Thanks for the input Manuel......What are you using for controllers? What is "Aufschwinghalterungen" ?