How to compare gasengine size to outrunner ?

[What's_nitro?]

When in doubt, 1527. Oh and your link doesn't work because you have an extra "http" at the beginning. That motor should do OK though. They say 8s LiPo max so I'd be careful if you expect to run it on 10s.

[stum]

Differential Ratio: 1
Transmission Ratio: 8.382
Other Ratio: 1
Spur Tooth Count: 57
Pinion Tooth Count: 26
Total Voltage: 22.2
Motor KV: 1577
Tire Diameter (inches): 6.88
Tire Ballooning (inches): .5
Motor Current Draw: 80
Motor coil Ω: 0.008
Spur/Pinion Ratio: 2.19 : 1
Total Ratio: 18.37592 : 1
Tire Circumference (inches): 24.76 inches (628.8 mm)
Total Motor Speed: 34000.12 RPM
Vehicle Speed: 43.38 mph (69.68 km/h)
Estimated Adjusted Speed: 41 mph (66 km/h) - 6% loss
Effective KV Value: 1531.54
KT constant: 0.86 oz-in/A
Motor Torque: 0.36 ft-lbs
Final Torque: 6.57 ft-lbs
Final Power: 1776 watts (2.4 HP)



Differential Ratio: 1
Transmission Ratio: 8.382
Other Ratio: 1
Spur Tooth Count: 57
Pinion Tooth Count: 20
Total Voltage: 29.6
Motor KV: 1577
Tire Diameter (inches): 6.88
Tire Ballooning (inches): .5
Motor Current Draw: 80
Motor coil Ω: 0.008
Spur/Pinion Ratio: 2.85 : 1
Total Ratio: 23.8887 : 1
Tire Circumference (inches): 24.76 inches (628.8 mm)
Total Motor Speed: 45669.92 RPM
Vehicle Speed: 44.82 mph (71.99 km/h)
Estimated Adjusted Speed: 42 mph (68 km/h) - 6% loss
Effective KV Value: 1542.9
KT constant: 0.86 oz-in/A
Motor Torque: 0.36 ft-lbs
Final Torque: 8.54 ft-lbs
Final Power: 2368 watts (3.2 HP)

Differential Ratio: 1
Transmission Ratio: 8.382
Other Ratio: 1
Spur Tooth Count: 57
Pinion Tooth Count: 26
Total Voltage: 22.2
Motor KV: 1500
Tire Diameter (inches): 6.88
Tire Ballooning (inches): .5
Motor Current Draw: 80
Motor coil Ω: 0
Spur/Pinion Ratio: 2.19 : 1
Total Ratio: 18.37592 : 1
Tire Circumference (inches): 24.76 inches (628.8 mm)
Total Motor Speed: 33300 RPM
Vehicle Speed: 42.48 mph (68.24 km/h)
Estimated Adjusted Speed: 40 mph (64 km/h) - 6% loss
Effective KV Value: 1500
KT constant: 0.9 oz-in/A
Motor Torque: 0.38 ft-lbs
Final Torque: 6.9 ft-lbs
Final Power: 1776 watts (2.4 HP)


Differential Ratio: 1
Transmission Ratio: 8.382
Other Ratio: 1
Spur Tooth Count: 57
Pinion Tooth Count: 25
Total Voltage: 29.6
Motor KV: 1250
Tire Diameter (inches): 6.88
Tire Ballooning (inches): .5
Motor Current Draw: 80
Motor coil Ω: 0
Spur/Pinion Ratio: 2.28 : 1
Total Ratio: 19.11096 : 1
Tire Circumference (inches): 24.76 inches (628.8 mm)
Total Motor Speed: 37000 RPM
Vehicle Speed: 45.39 mph (72.91 km/h)
Estimated Adjusted Speed: 43 mph (69 km/h) - 6% loss
Effective KV Value: 1250
KT constant: 1.08 oz-in/A
Motor Torque: 0.45 ft-lbs
Final Torque: 8.62 ft-lbs
Final Power: 2368 watts (3.2 HP)

[What's_nitro?]

I'd definitely go 8s with the 1521/1y. Lots more torque at the wheels with that gearing. Speedy, those motors are nice and they will get the job done, but they are $65 for a reason. If they get pushed too hard they pop, fizz, etc. You should save your money and get better stuff because you'll be happier in the end. On the other hand, try the outrunner. If it blows up then w/e- it was cheap!

[What's_nitro?]

I don't think the KB45 would be enough if some are saying that the 1521 wouldn't cut it. The Sentilon HV controllers are very nice though. That would be my choice for an "inexpensive" controller. You might want to consider the CC HV110 as well.

[What's_nitro?]

Oppressor, the Sentilon line of controllers are probably better quality than everything else on the Hobby City site. I have used one of those 100A controllers and it was great! As long as the truck is reasonably geared there will be no issues with cogging. They have a large heatsink as well, but mine never got much above ambient. I was using it in my Ofna GTP on 6s with a Neu 1515/1y geared for about 76mph (using mechanical brakes of course). I could light up all 4 tires (foams) at will.

[Oppressor]

Originally Posted by What's_nitro?

Oppressor, the Sentilon line of controllers are probably better quality than everything else on the Hobby City site. I have used one of those 100A controllers and it was great! As long as the truck is reasonably geared there will be no issues with cogging. They have a large heatsink as well, but mine never got much above ambient. I was using it in my Ofna GTP on 6s with a Neu 1515/1y geared for about 76mph (using mechanical brakes of course). I could light up all 4 tires (foams) at will.

That's good but it doesn't change the fact that 12s and 100 amp seem too little to me for an 1/5 and 40+ mph...

[What's_nitro?]

Well, then I guess an HV110 is in order. But I don't think he wants to spend that much....

[SpeedAssault]

I liked reading this info but was a little tough to follow.
I'm just trying to learn about high power brushless for a 1/5 build I'm starting at the bottom low budget at till I can afford it

Thank you for this subject

Keep us informed and the outcome

[BrianG]

I agree. Better to do it right the first time than to do it twice.

A smaller motor can push it, but as others say, it will get too hot too fast. For something that large, you need torque - and that requires a large motor. I too would look at the 1527 at a minimum, but the 2215 probably would be more optimum.

Once you get your motor choice squared away, use high voltage to keep current levels manageable. Even on 10s, I would expect large current spikes on startup simply because of the size/weight. For something like this, I would like a 200A ESC @ 10s (or 12s), otherwise the ESC will be working hard IMO. I don't think the Sentilon will like this setup unless you can have someone parallel 2 or 3 of the FET boards, but then you are at ~$300. At that point, might as well get an MGM or something. Contact Castle - they might have a recommendation for you (they have a large HV/200A ESC in their special projects page). They may be able to custom build you a super-HV110 by adding one or two more FET PCBs, but that will cost more.

No matter what, pushing a 25lb vehicle to 40mph speeds is not gonna be cheap.

[lutach]

Originally Posted by BrianG

I agree. Better to do it right the first time than to do it twice.

A smaller motor can push it, but as others say, it will get too hot too fast. For something that large, you need torque - and that requires a large motor. I too would look at the 1527 at a minimum, but the 2215 probably would be more optimum.

Once you get your motor choice squared away, use high voltage to keep current levels manageable. Even on 10s, I would expect large current spikes on startup simply because of the size/weight. For something like this, I would like a 200A ESC @ 10s (or 12s), otherwise the ESC will be working hard IMO. I don't think the Sentilon will like this setup unless you can have someone parallel 2 or 3 of the FET boards, but then you are at ~$300. At that point, might as well get an MGM or something. Contact Castle - they might have a recommendation for you (they have a large HV/200A ESC in their special projects page). They may be able to custom build you a super-HV110 by adding one or two more FET PCBs, but that will cost more.

No matter what, pushing a 25lb vehicle to 40mph speeds is not gonna be cheap.

He could use a Jeti SPIN200? I do have 3 of them .

[speedracer1129]

Here is a thread you might to check out if you really want to know what you are getting into: http://www.hpibajaforum.com/forum/sh...ad.php?t=13998