RC-Monster Forums - View Single Post - On-road BL project

BrianG · 08.16.2006, 08:43 PM

It's finally done! :027:

I got the 4600 package in the other day and also got a pinion. I have it all hooked up now and I must say I am quite impressed! I haven't done any speed runs but I know it's fast and the torque is crazy. I had to adjust the torque curve to keep from spinning out on startup.

The Mamba Max ESC is tiny and is easy to mount. I had to shorten the motor wires 4" total to keep it neat and tidy. The USB interface and software couldn't be better IMO. Sure beats programming with the Tx only. Cogging is VERY minimal and only at extremely slow speeds under load (trying to go over something). I'd say it's equal or better than the Quark for cogging. The only problem I have is that the ESC gets to about 130 degrees, which is a little too hot for my liking especially since I haven't run it hard yet. I am using the built-in BEC so that makes a difference. To test how much of the heat the BEC causes, I ran the steering servo (85 oz-in Spektrum servo) back and forth continuously without running the main motor and the heatsink gets to about 90 degrees. So, I think I'll get a digital UBEC to keep the heat load off the ESC, especially since I'm thinking of going 3s.

I brought the Jato to work and played around for about 15 minutes, then brought it home and played around in my basement for another 30 minutes on a makeshift "track" consisting of various boxes and other obstacles. The thing literally turns on a dime. I then charged the e-moli 2s2p (6Ah) pack and only put 2.6Ah in it. That's less than half discharged for 3/4 hour of runtime. Not too bad. That equates to an average current draw of about 3.5A. Seems a bit low, but I was also running about 1/2 throttle tops in spurts. I'll be happy to get 40 minutes of parking-lot bashing time or 30 minutes race time, which I think is easily attainable.

The whole Jato is 2166g (4.78lbs), and 400g (~1lb) of that is the batteries. If I go with 2s1p setup, I can get the weight down to 4.3lbs. I'm using 54T/22T gearing for a total reduction of 9.64:1. The weight distribution keeps the front-end down to tame wheelies, so I'm not sure how it will do at jumping. I didn't design it for that, but I'm curious.

Overall, it's a blast to drive. It's lighter to carry around than the Revo, easier to charge, and smaller (easier to drive in smaller areas), so I can see myself playing with the Jato more than the Revo. I may take it to the track at my LHS (HobbyHaven) sometime before I wear the tires down to slicks. :)

	(#81)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	08.16.2006, 08:43 PM It's finally done! :027: I got the 4600 package in the other day and also got a pinion. I have it all hooked up now and I must say I am quite impressed! I haven't done any speed runs but I know it's fast and the torque is crazy. I had to adjust the torque curve to keep from spinning out on startup. The Mamba Max ESC is tiny and is easy to mount. I had to shorten the motor wires 4" total to keep it neat and tidy. The USB interface and software couldn't be better IMO. Sure beats programming with the Tx only. Cogging is VERY minimal and only at extremely slow speeds under load (trying to go over something). I'd say it's equal or better than the Quark for cogging. The only problem I have is that the ESC gets to about 130 degrees, which is a little too hot for my liking especially since I haven't run it hard yet. I am using the built-in BEC so that makes a difference. To test how much of the heat the BEC causes, I ran the steering servo (85 oz-in Spektrum servo) back and forth continuously without running the main motor and the heatsink gets to about 90 degrees. So, I think I'll get a digital UBEC to keep the heat load off the ESC, especially since I'm thinking of going 3s. I brought the Jato to work and played around for about 15 minutes, then brought it home and played around in my basement for another 30 minutes on a makeshift "track" consisting of various boxes and other obstacles. The thing literally turns on a dime. I then charged the e-moli 2s2p (6Ah) pack and only put 2.6Ah in it. That's less than half discharged for 3/4 hour of runtime. Not too bad. That equates to an average current draw of about 3.5A. Seems a bit low, but I was also running about 1/2 throttle tops in spurts. I'll be happy to get 40 minutes of parking-lot bashing time or 30 minutes race time, which I think is easily attainable. The whole Jato is 2166g (4.78lbs), and 400g (~1lb) of that is the batteries. If I go with 2s1p setup, I can get the weight down to 4.3lbs. I'm using 54T/22T gearing for a total reduction of 9.64:1. The weight distribution keeps the front-end down to tame wheelies, so I'm not sure how it will do at jumping. I didn't design it for that, but I'm curious. Overall, it's a blast to drive. It's lighter to carry around than the Revo, easier to charge, and smaller (easier to drive in smaller areas), so I can see myself playing with the Jato more than the Revo. I may take it to the track at my LHS (HobbyHaven) sometime before I wear the tires down to slicks. :)