Various Baja 5b questions and a possible new project

[lincpimp]

Originally Posted by What's_nitro?

I'm a huge fan of the Sentilon ESC's. It ran my GTP with a 1515/1y, 6s, and 30/40 gears better than a MMM. The slow startup will help the drivetrain last longer- and I assume you are using mechanical brakes since you're looking at the HV110. If you have the batteries (haha) for the 10s/dual 1521 setup then that is what I would do. With 10s there is plenty of headroom on the Sentilons, and 100A would be more than sufficient because the running load is split between two motors/ESC's. On top of that I bet Neil would put you on his Awesome RC's page!

10s... I can do that with the cells I have. I may have to give this a try. Lets see what I can do to actually get my hands on the 5b. 50mph sounds like fun. Hopefully the lipos can handle it...

[lincpimp]

Hey WN, did you ever get the Sentilon to startup well? I just went back and read the thread you had. You gearing was steep...

Looking at the baja 5b it has a 17t pinion so the stock motor must do something like 15k rpm max. With the 1521 motors on 10s I am getting 28k rpm, so I think 2 of them with 12t pinion will do the job.

Heres the calc, eyeball it and see if I got it right???

Differential Ratio: 1
Transmission Ratio: 2.4000000000000003
Other Ratio: 1
Spur Tooth Count: 57
Pinion Tooth Count: 12
Total Voltage: 37
Motor KV: 780
Tire Diameter (inches): 6.6875
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.025
Spur/Pinion Ratio: 4.75 : 1
Total Ratio: 11.4 : 1
Tire Circumference (inches): 21.01 inches (533.64 mm)
Total Motor Speed: 28860 RPM
Vehicle Speed: 50.37 mph (80.91 km/h)
Effective KV Value: 780
KT constant: 1.73 oz-in/A