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

[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.

[lutach]

I have the Mega ACn22/30/2 in my truggy and it runs nice and cool. I have a 14T pinion and 49T spur. The diffs are from the buggy so they are 3.3 ratio. I tried a Feigao 7XL with 4S and it ran hot. You will be amazed on how a well geared Mega will run.

[BL_RV0]

Hopefully it will all work out. I am working on pricing right now.

[othello]

@lutach
Hmm ...interesting. Such a light and small motor in a truggy and no temp probs. This really sounds amazing. I never would have considered such a light motor in a truggy. I thought a Neu 1512 is already some kind of a light wheight in a truggy. it performed very well in my truggy but was more on the hot side when compared to the Neu 1515. Those Mega 22/50 seem to be tempting for bigger projects.