Savage project idea. Please read have many ?'s!

[BL_RV0]

Ok, so you're saying that a 22/45/3 is a batter choice with 12s than a 22/45/2 with 10s?
EDIT: I would like to have softer start to save my transmission and differentials.

[othello]

It really depends what gearing options you have. Crunch some numbers using BrianGs speed calculator. If you can reasonably gear a motor with 40000rpm. Go for it, but it might run hotter then a motor revving at 30000-35000rpm. If you want more runtime and lower temps go with the higher wind version. Either on 10s or 12s A123.

Wheight depends on how much does a savage roller wheigh? Wheight of your electrical components is easily calculated. Wheight of your desired tires really can make a difference in wheight. I never converted a savage, so i can't tell you.

[BL_RV0]

I've been using his calculator alot. I'll use the /3 wind, plus in some numbers, and see what it spits out.

[BL_RV0]

Here is what I got:


Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.5833333333333333
Other Ratio: 0.967741935483871
Spur Tooth Count: 49
Pinion Tooth Count: 14
Total Voltage: 39.6
Motor KV: 1000
Tire Diameter (inches): 7
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3.5 : 1
Total Ratio: 17.73883 : 1
Tire Circumference (inches): 21.99 inches (558.58 mm)
Total Motor Speed: 39600 RPM
Vehicle Speed: 46.49 mph (74.68 km/h)
Effective Speed Rate: 1.17 mph/V (1.89 kmh/V)
Estimated Adjusted Speed: 44 mph (70 km/h) - 6% loss
Effective KV Value: 1000
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

[othello]

You have to reduce total voltage to 32-36v (with 12s under load at full speed). A heavy truck sucks 800-1500 Watts at those speed levels (above 40mph) depending on the surface you run it. Meaning you will need up to 45A. At this amp level voltage of A123 cells drops down to 2.8v per cell.

So 33v will give you a more realistic speed and rpm under load.

[BL_RV0]

Alright. This seems like my setup, just have to sell a few things before i start buying.

[othello]

Good luck with it. Will be interesting to follow up and see how the components behave in a heavier truck.