Brushless Hyper st pro Build

[MetalMan]

KB-45 10XL with HV-110 in a custom center diff Savage on 5s2p and 10s2p A123 here... That's one powerhouse of a motor. It's been holding up to abuse that broke a Feigao 12XL's magnet...
I'm currently replacing this KB-45 10XL with one of the Hobby City KD36-74 1200 kv motors, because the KB-45 is too large of a diameter to allow me to use the 3rd disc brake, and it will also allow me to use a smaller pinion.

[Pedebeater]

Please let me know what you think of that motor when you get it Metalman, I am desperate to find out the quality/preformence.


Thank you

[lincpimp]

Originally Posted by MetalMan

KB-45 10XL with HV-110 in a custom center diff Savage on 5s2p and 10s2p A123 here... That's one powerhouse of a motor. It's been holding up to abuse that broke a Feigao 12XL's magnet...
I'm currently replacing this KB-45 10XL with one of the Hobby City KD36-74 1200 kv motors, because the KB-45 is too large of a diameter to allow me to use the 3rd disc brake, and it will also allow me to use a smaller pinion.

I guess let us know how that kd motor does. Similar to a 14xl feigao. I have had good success with the 14xl on 8s lipo in my savage. I did put a rcm heatsink/clamp on it, and that seems to keep the temps around 140f. Even after 30 mins it is still around 140. I am geared for 42mph is memory serves me right. And I still use the stock tranny with the 2 speed, in fact that savage is about as stock as it gets.

[MetalMan]

Originally Posted by Pedebeater

Please let me know what you think of that motor when you get it Metalman, I am desperate to find out the quality/preformence.


Thank you

I've had the motor for a couple weeks, but I'm just now tearing down my Savage to accept this motor. By Sunday night I should have a report on it .

Originally Posted by lincpimp

I guess let us know how that kd motor does. Similar to a 14xl feigao. I have had good success with the 14xl on 8s lipo in my savage. I did put a rcm heatsink/clamp on it, and that seems to keep the temps around 140f. Even after 30 mins it is still around 140. I am geared for 42mph is memory serves me right. And I still use the stock tranny with the 2 speed, in fact that savage is about as stock as it gets.

Any idea how much your truck weighs? I would estimate mine at ~12lbs with 10s1p A123, although that is merely an estimate.

[Pedebeater]

Are both ends on the motor clamped like the feigao's were?

[MetalMan]

As far as I can tell they are, but it's possible they're screwed on like the KB-45 motors. I still have to grind a flat spot on the shaft, also.

[Pedebeater]

ok cool. Atleast those screw-on endbells can be thread locked.

[lincpimp]

Originally Posted by MetalMan

I've had the motor for a couple weeks, but I'm just now tearing down my Savage to accept this motor. By Sunday night I should have a report on it .



Any idea how much your truck weighs? I would estimate mine at ~12lbs with 10s1p A123, although that is merely an estimate.

I would say that my truck should be similar weight to yours. You have a heavier battery, but lighter tranny, and i am the opposite. I can weigh it tomorrow and we will see..

[Finnster]

I don't think that the kb45 motor would be terrible, but I think its just not the right motor for the app. 2300kv is too high for a 5S setup, esp w/ a cheap motor. I'd be looking at ~1600-1700kv. I can't imagine that thing wouldn't have to be babied to not overheat.

Also, usually larger diameter motors spool up slower, but have more TQ. That would be a great motor in an MT where you want tons of TQ for climbing and bashing, for a truggy I would want something with a faster spool up so its more responsive. Also, its a PITA if the thing has too much TQ as you don't want to either be: a) popping wheelies on the track b) diffing out badly in the F or c.) have to put really hvy oil in the CD to stop diffing out badly and F'up the turning capability

My 1st revo was a wheelie monster. It was a lot of fun for a while, but got to be a pain. I had to let off the throttle just to turn as the wheels barely ever touched the ground and it was hard to accel fast as it would just pop the F end up. It was like driving a big block '72 Impala when the hyper St is more of a porsche.

Not only that, it sucks having to stop and let the motor cool whenit gets hot, or worry about not being able to drive however you want for fear of overheating. "Long grass? Uh oh... I better go easy so I don't fry my motor..." My last revo was a 1515/2Y (1100kv) on 8S. Really good power but never got warm. I could drive and do anything I wanted and temps never budged. Perhaps I've just gotten spoiled, but its just liberating to be able to drive w/o worry. Hill climbs used to torture and fry lesser motors.

So I guess it all depends on what you plan to do with it. If its just for bashing about and doing spd runs then its not going to matter too much. If you plan on more racing I would go with a better suited motor, or at least a lower kv, higher V setup. 5S isn't too bad tho. Like arct1k, I don't see the point of dropping all this money on a nice trugg, $200 ESC, nice batts, then low ball the powerplant. Its a tempting thing to do, and I've certainly done it before, but it seems like you end up having to spend quite alot in the end to make it work right (clamps, heatsinks, fans etc) or just end up buying a good motor in the end. Even the Medusa 60mm motors sound like a great deal, Neu-like performance at only ~$100. And made in USA. The 60mm 2000kv motor geared high should be pretty snappy, quick and reliable, or even the 1600kv on 6S should be good. Else go cheap, be easy, and wait for the 70mm medusas to come out or the CC neus for a reasonbly priced option.

Wow.. that was a long post...and all just my humble opinion. :)

[Pedebeater]

Thank you very much for that long and thoughtfull opinion.

This is not going to be a race truggy unfortunatly. There is nowhere around here to race. So it will be just for bashing and speed runs. Should go well with takedowns upcomoming MBX5T. I am most likely just going to use this motor untill I gewt around to purchase a medusa. And the motor I am getting now is 1900kv, so it should be well fitted for 5s.

[Takedown]

I sure hope we will be able to build at the same time as each other. Have a double truggy conversion build thread. We'll call it "MBX5T & Hyper ST Pro Build/Conversion".

What do you think?

[Pedebeater]

Sounds like a killer idea Takedown! I am really lookihg forward to how they compair.

[Takedown]

I sure am looking forward Building them side x side and comparing build difficulty and overall looks and final preformance of both. Wont be able to run mine for a little while after I get it built tho seeing that I need an ESC after that yet.

[Pedebeater]

I am right there with you. I should be getting most of the things for the truggy at the same time. But I will have to wait to buy the MMM.

[Takedown]

Same issue... Have to wait to get the MMM.