brushless 1/5 4wd conversion about to begin! couple questions.

[Unsullied_Spy]

Aww, those 22** motors sound awesome! Great vid, it was worth the wait!

[Ryu James]

Originally Posted by kulangflow

Video is up!

http://www.youtube.com/watch?v=Zgx-ySspOhk&fmt=22

Unfortunately, YouTube audioswap killed the beautiful brushless sounds, but you can just imagine them. lol

wow Brian! the video turned out great. love the HD. you seriously have a talent for filming and editing. Props to Kulangflow for providing the vid. you make my truck look like the poster child for the Castle website or something. lets do it again sometime but with a little golf course action. i hit up the GC by my house today again and had a blast.

and my extended hubs came today so now i can get my disc brakes installed this week. its gonna be a lot more fun to drive once i have the brakes on. i havent been able to control my pitch off jumps without brakes. cant wait.

[redshift]

Great job with the slo-mo sequences kulang!

Ryu you're driving it like you had more than a few days with it... not babying it much are we?

That front end jump shot was killer!

Nice work both of you

[Ryu James]

Originally Posted by redshift

Great job with the slo-mo sequences kulang!

Ryu you're driving it like you had more than a few days with it... not babying it much are we?

That front end jump shot was killer!

Nice work both of you

thanks redshift. kulang did a great job. i need to invest in an onboard cam sometime and get some vids like yours one day. i recently watched a bunch of your vids. great stuff.

[redshift]

Glad you enjoyed man, if you guys like I can start a thread on OBV. I spend some time on the AP forum on RCGroups, always looking for better equipment. HD is still has a bit of an issue for high speed motion but we are getting closer.....

[kulangflow]

Thanks for the comments on the video, gents. I enjoyed the filming/editing.

Ryan, we'll definitely have to hit the golf course next week. Let me know what day works well for you.

Good times.

that vid was sweet, thanks for sharing!!!

[aqwut]

Sweet *ss video man.... Excellent Job on the editing.... !! Will be looking forward to more V D Os

[Bondonutz]

Ben following both builds from the start and I'm impressed with what I've seen and read. The end result of the fruit of your labors are spectacular and I'm envious of you both, great jobs. The video was great, nice shots and awesome editing A++.

[florianz]

wow, fantastic!! great video! and I love that build (and those wheels!)

[Ryu James]

thanks all. the vid is great thanks to kulangflow and the truck has been fun. here is my new body since my first got destroyed. the new body makes it look much larger. i took it to the park yesterday and shredded! it was a blast. hauling across the grass on two wheels half the time. i did an end-over-end flip about 30 ft coming off of a grass hill jump. kept on trucking. one problem though. i checked temps when done and motor was 170* and esc was 110*. esc is fine obviously but that motor temp was totally unexpected and in the danger zone. everything is fine but i like to keep things at 150* or less. i thought i was safe since i had been checking temps every five minutes the first few days of running and never saw it get hot once. i was really running it hard but what do you guys think caused it? geared to high? geared to low? i have a 17t and 18t pinion i could try. should i try those and go higher? based on esc temps isnt it most likely geared too low? and actually i dont know how hot the esc was. by the time i got to it to check it was only like 80* but had the fan on it and the motor had cooled 30* in the time period to get to the esc so i am just guessing the esc was about 110*. it could have been cooler.

broken body:




new body:

[redshift]

IF gearing is producing the torque/speed you want, then it's time to reconsider your motor mount. The motor mount, while open, is still thick. I don't think you have one-quarter of the fan that motor needs... and the mount may be acting as an insulator more than a heatsink. You have enough of a hole to use a larger fan, and I would consider one on either side (if you have the room) blowing inward, so that the top is just an exhaust. The fins can't do their job in a semi-enclosed mount like that IMO.

If you have to make more relief for air around the inside, it won't show. But it could be a big help.

Or just wait for colder weather lol... won't be long!

[Ryu James]

Originally Posted by redshift

IF gearing is producing the torque/speed you want, then it's time to reconsider your motor mount. The motor mount, while open, is still thick. I don't think you have one-quarter of the fan that motor needs... and the mount may be acting as an insulator more than a heatsink. You have enough of a hole to use a larger fan, and I would consider one on either side (if you have the room) blowing inward, so that the top is just an exhaust. The fins can't do their job in a semi-enclosed mount like that IMO.

If you have to make more relief for air around the inside, it won't show. But it could be a big help.

Or just wait for colder weather lol... won't be long!

hmm....yeah i like the gearing as far as performance and speed. its definitely fast enough....i dont think its the motor mount though....although it looks beefy it is not thick. the face is only .15", just enough to allow for a flathead screw, and the sidewalls are only .10" thick, a couple millimeters literally. the corners are the thickest. i could chamfer those but felt it was unnecessary.......but i do have a larger 60mm fan that i had planned to use but just threw the 40mm on cuz i didnt have to drill any holes. i had considered mounting the 60mm fan so that instead of sitting square on the flat part of the mount it would actually sit so that half the fan blades are over the hole to cool the can of the motor and the other half is over the front endbell to provide air to those holes in the endbell allowing the motor to breathe better and perform better....and most likely be cooler. and i have compared the 40mm and 60mm fans and teh 60mm definitley blows much more air. i will give it a shot but i would rather eliminate the cause of the heat (gearing, weight, kv, etc) rather than just strapping on bigger and better fans.

i am gonna put in an order for a Neu 2220 2y 550kv motor next week. not necessarily to fix this issue (although i will try it in the ramp) but to prepare for the baja conversion and i wanted to get it first to run it in this rampage to see the performance difference over the 2215.

like this:

[redshift]

Ok James, it does look thicker than it is apparently. I have to cauton you about "splitting" the flow with these little fans. They load up and will themselves run hotter, if there is obstructed flow.
You can try it, just hold one while it's running and cover up a small part and you'll hear it bog.

So my suggestion would be a venturi setup for smooth flow between the fan dia. and the square hole. A piece of modified tupperware, something like that.

Certainly not as clean as what you had, but if it keeps that big dollar motor happy for now.... :)

[redshift]

Ok that's twice I forgot to mention, new body looks way cool!

Me likes.

Alright... sleep time for me.