RC-Monster Forums - View Single Post - Various Baja 5b questions and a possible new project

lincpimp · 03.18.2009, 01:07 AM

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

	(#7)
lincpimp Check out my huge box! Offline Posts: 11,935 Join Date: Aug 2007 Location: Slidell, LA	03.18.2009, 01:07 AM 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 Alot of Savage parts for sale!!!