The best motor for heavy Savage - RC-Monster Forums

virusss · **The best motor for heavy Savage -** 01.04.2006, 05:27 PM

Hallo boys I wanted to ask to you which motor I can use on mine savage (6,5kg)best of BK 9XL, lehner the 1940 clearly offer an increase of the performance?Or that motor advised to me?

captain harlock · 01.04.2006, 06:43 PM

You can go for the 1940 or the 1950 motors, but make sure to choose one with a low turn which can pull your truck at ease and deliver you satisfying speed.

Serum · 01.04.2006, 06:49 PM

on 20 cells a 10XL or 11XL would be my choice.. (or a 1950, in the same KV range)

captain harlock · 01.04.2006, 07:04 PM

If there is a motor of a short rotor and another one of a long rotor and both of them are identical in the kv range, what could be the difference?

Serum · 01.04.2006, 07:07 PM

torque.

captain harlock · 01.04.2006, 07:08 PM

You mean the short might get hotter than the long using the same gear ratio and no. of cells, right?

01.04.2006, 07:12 PM

yep i think thats right, longer=more torque

captain harlock · 01.04.2006, 07:23 PM

My biggest concern is that I want to pull my maxx to hi 40s or mid 50s with a rotor between the length of a 1930 and 1940. The kv is around 1300.

RC-Monster Mike · 01.04.2006, 09:38 PM

That is a lot to ask of a fairly small motor(can do it, but it is working pretty hard). 1940/1950/Wanderer xl motors would be the best choices IMO.

captain harlock · 01.04.2006, 09:41 PM

You mean my chance of reaching such velocity with a 59mm long 35 wide motor is minimal?

GriffinRU · 01.04.2006, 10:24 PM

Quote:

Originally posted by captain harlock
If there is a motor of a short rotor and another one of a long rotor and both of them are identical in the kv range, what could be the difference?

small block - big block
short stroke - long stroke

small block, short stroke - 6-turn short can (ex. feigao 6S)
small block, long stroke - 26-turn short can (ex. feigao 26S)
big block, short stroke - 6-turn long can (ex.feigao 6XL)
big block, long stroke - 26-turn long can (ex. feigao 26XL)

Maximum motor power can be achieved either at max RPM or at max torque, but its value is constant at the same motor can size. (ex. Feigao S size rated around 600W, L size 800W and XL 1200W.)
Good compromise (Torque vs. RPM) is in between and based on application and driver preference.

Fuel efficiency goes toward electrical efficiency
Performance follows as well.

And with extra cell's you do the same thing as you do with turbo or super chargers, bigger injectors, better filters ... :)

Artur

RC-Monster Mike · 01.04.2006, 10:30 PM

Oh, you can get the speed, but you get heat with it, as it is working the little motors quite hard.

GriffinRU · 01.04.2006, 10:47 PM

Quote:

Originally posted by RC-Monster Mike
Oh, you can get the speed, but you get heat with it, as it is working the little motors quite hard.

Efficiency is the key, when it goes down heat goes up.
For a example with 80% (very good numbers, unrealistic ones but...) motor efficiency with 600W load you need to dissipate 600*.2=120W with 60% - 600*.4=240W. Now based on can size you can easy find out which one has more thermo-mass and bigger cooling area.

But with the rest, you correct, it is always possible to push it harder, especially for short periods.

Artur

P.S. Thank you for new ESC.

captain harlock · 01.05.2006, 12:13 AM

What about the segmented motors like..say a kontronik FUN600 or a Lehner 1930? would they tolerate heat? with a heavy alum. truck
BTW, the kontronik motors have only three segments while the lehners have much more seg. than the Kontroniks. would that make much of a difference in performance and effeciency and so forth?

SpEEdyBL · 01.05.2006, 08:18 PM

You might want to try a lehner 2230 or 2240. They have a bigger rotor diameter than the 19xx series.