Help, 1527 1Y vs 1717 1Y

[Cooper]

Hey guys I need some help determining what motors I want. Question for me is what is the difference between a 1527 and 1717?

Neu 1527 1Y 1250kv, 4500watts, 38mmx100mm
Cc 1717 1Y 1580kv, 4650watts, 49.9mm x 85mm

Would the 1717 be more capable of higher rpm due to shorter rotor length? Oblivious there is a difference in kv, I just wanted some opinions between the two, these are going into a saw cat. I'm assuming they are built similar.? Materials, bearings, rotor wrap? These are going to be stretched to their limits and beyond possibly. Would the longer can with a longer jacket be capable of more cooling? Or irrelevant ? Just want some opinions.

[Heaving Earth]

I would think the 1527 would be capable of higher Rpm being longer. Have no idea tho. My thinking is the longer smaller diameter can will have a longer smaller diameter rotor, thus having less centrifugal Force on the rotor as opposed to a larger diameter can with larger diameter rotor having more centrifugal force. Of course I'm prolly way off. I'm just guesssing here. Sorry to clog your thread with nonsense if I'm not correct

[Cooper]

Any input is appreciated. I was thinking a longer can having longer rotor magnets will be more prone to "comming unglued" as a shorter set of polls. Alot of centripital force on the wrap and magnets as well as centrifugal forces.

[Heaving Earth]

Well if you take a tire from a Honda civic, then take a tire from a monster truck, and spin them at the same rpm, I would think that the od of the monster tire is gonna have much more force trying to pull it apart

[Heaving Earth]

I have always understood that larger dia motors have more trouble with higher rpm

[Cooper]

Between these two I was thinking the length was more relevant to high rpm than the diameters. As the failing point in a high rpm being magnets comming loose, broken wrap, glue letting loose.

[TristanJones]

I would think the quality and construction of the bearings would surely have as much if not more baring on the life span at ultra high rpm. I realize the rotor is under a lot of stress also, though I thought more affected by temp than rpm (could be way off here).
Id go for the lighest, highest KV option being a SAW boat, but I have never built or raced one.

[Heaving Earth]

Very true. Personally I would go for the Neu

[keithbradley]

The 39mm motor is rated at 60k RPM, the 45mm is rated at 45k.
All things equal, the smaller diameter motor will always being higher RPM capable. A 200lb man can stand in the center of a spinning merry-go-round with little effort, but even a 100lb man will have a difficult time on the perimeter. The same is true with motor magnets.

[oscarel]

I've run both in a Whiplash on 6s. With the 1717 I was getting low/mid 60's with an X450 and was barely able to finish a 6 1/2 lap heat with 6600mah TP . With the 1527 1Y I can run X457 or ABC 2116 which puts me in upper 60's and can finish a heat with a little more breathing room. I may have eagletree graphs for both I can post later.

[jkr]

Depends where you want to put it and what you want from it.
Bearrings isn't much of a problem.you can change the a i always do with ceramics.
Only one thing is shure for the 1527.You can spin very high rpms.

[Cooper]

Have you ever run any up to 60k? If so, was it just once and done? Couple passes? Or continued use?

[Cooper]

Thank you , I was hoping to get some input from someone having first hand knowledge. I have always been leaning towards the 1527. Were you inside either one? I'm assuming they are built same?

[jkr]

For 60k neu is the way to go.

[keithbradley]

Are you planning on trying for a record Cooper or just for personal use?