Which 17.5 for Slash?

[fastbaja5b]

Hey guys I am wanting to run a 17.5 motor in my Slash behind a MM Pro ESC

Now I want to be able to run 2s for race and maybe 4s for bashing (geared down of course)

Any ideas what Roar legal 17.5 motors would be capable?

I have a Fantom Ion 17.5 at the moment (rebadged Trinity Duo) but the email I got back from Fantom Racing suggests it's not designed for anything over 2s lipo and would most likely die if I attempted it.

I looked at the Hacker Roar legal motors and emailed the same query to their customer service gurus without response.

Any ideas?

[MetalMan]

Just this past weekend I acquired a Novak 17.5 (the regular one, forgot what they call it) at a really good price for my Blitz, which is currently running a Sidewinder. On 2s with HPI's recommended gearing my truck was about the same speed as with the stock Blitz motor but it had more torque. The 17.5 never broke about 90 deg F and the Sidewinder didn't get above ambient.

Last night I bumped it up to 4s, same gearing. It was fun and decently fast but still had good torque that was easy to control. Cogging became an issue with the Sidewinder but I too am planning on a MM Pro for the future.

As for the 2s limit, if their 17.5 shares the same construction as a motor with a lower turn (like a 7.5 or lower) then there's no reason you can't run 4s. 17.5 motors have a kv around 2200-2400 so on 4s they likely won't exceed 36,000 RPM. At that RPM I'd say it's pretty ideal.

[lincpimp]

Given my testing with the "roar" legal junk, they are not worth a crap with a decent load. I tired a 13.5 novak on 3s lipo in a pede and unless i geared it for 30mph it would overheat very quickly. Maybe 4s would be better, but I still doubt the 380 S size internals are capable of much. Now the 13.5 is in my cr01 crawler on 2s, geared for 13mph. Works fine with that load.

I have not been very impressed with the 2 pole slotless motors from novak. I put them on par with the feigao 380c motors, and almost have to give the nod to the feigao. No comparison to a 540 S can, and certainly nothing compared to a 1506.

Hopefully CC will come out with a properly designed motor to go with the MMPro in a bunch of winds. I have read plenty about the novak 2 pole motors, and most in the know do not think much of them. Only reason they are popular is cause of Roar.

I do run a 3.5/GTB setup in my tamiya M03 fwd car. Pretty pathetic if you consider the fact a M03 chassis weighs next to nothing and this is not really overpowered (not like a 1521 on 6s in an lst). I guess for racing power is not all that necessary... But this is the most powerful setup novak sells, and I have it in a tiny, light car geared for 55mph, and it is still not very impressive.

[SpEEdyBL]

If a motor is going to be roar legal and a of a specific turn, its not going to vary much from any other roar legal motor. That's what makes it "roar legal," meaning it will have very similar construction, thus similar kv and rpm limit. So i would say, go ahead, run that duo on 4s. Trinity is just giving you crap as usual.

[fastbaja5b]

It was actually Fantom Racing that said 4s was a no no, but yeah their motor is a rebadged Trinity.

I might gear it for around 40mph and try it on 4s Lipo with the eagletree and see what that gives me :)