Save My Insanity!! - RC-Monster Forums

RC-NUT · 10.31.2010, 09:55 AM

Nice! Thank you. I just spent some time on the Castle site reading about those motors. Your right I can't beat that price.

If I were to stay with 4s can you tell me what the difference would be between the 1518 / 1520 / 1717? I'm guessing the 1518 you suggested would be a little faster because it has the highest Kv rating. I'm also guessing the other 2 motors would shine better with 5s or 6s?

Am I in the ball park? The 1717 is also physically larger so I wonder what effect that has?

thzero · 10.31.2010, 11:42 AM

On 4S? I'd go with a 1515 which is effectively what the Flux runs. A 1520 or 1717 you'd really have to gear up to get speed out of them on 4S. 1518 is probably a compromise as it requires less gearing but it is still closer to the 1520/1717 than the 1515. Run the numbers though Script Asylum's rc calc (http://scriptasylum.com/rc_speed/_top_speed.html) and see what the rough numbers come out too.

Quote:

Originally Posted by RC-NUT

Nice! Thank you. I just spent some time on the Castle site reading about those motors. Your right I can't beat that price.

If I were to stay with 4s can you tell me what the difference would be between the 1518 / 1520 / 1717? I'm guessing the 1518 you suggested would be a little faster because it has the highest Kv rating. I'm also guessing the other 2 motors would shine better with 5s or 6s?

Am I in the ball park? The 1717 is also physically larger so I wonder what effect that has?

RC-NUT · 10.31.2010, 12:25 PM

Man that 1717 is a beast. I was just watching some video's on 6s.

I may have to buy the 1717 as well as something else.

RC-NUT · 10.31.2010, 12:43 PM

Castle 1518:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 49
Pinion Tooth Count: 18
Total Voltage: 14.8
Motor KV: 1800
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.72 : 1
Total Ratio: 9.00427 : 1
Tire Circumference (inches): 17.28 inches (438.88 mm)
Rollout: 1.92:1
Total Motor Speed: 26640 RPM
Vehicle Speed: 48.41 mph (77.76 km/h)
Effective KV Value: 1800
KT constant: 0.75 oz-in/A

RC-NUT · 10.31.2010, 12:45 PM

Castle 1717:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 49
Pinion Tooth Count: 18
Total Voltage: 14.8
Motor KV: 1580
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.72 : 1
Total Ratio: 9.00427 : 1
Tire Circumference (inches): 17.28 inches (438.88 mm)
Rollout: 1.92:1
Total Motor Speed: 23384 RPM
Vehicle Speed: 42.49 mph (68.26 km/h)
Effective KV Value: 1580
KT constant: 0.86 oz-in/A

thzero · 10.31.2010, 12:48 PM

2 for 1. :)

Quote:

Originally Posted by RC-NUT

Man that 1717 is a beast. I was just watching some video's on 6s.

I may have to buy the 1717 as well as something else.

RC-NUT · 10.31.2010, 12:53 PM

Kershaw Designs is blowing out the 1717 for $179.00!!

I guess I can't argue with Castle for $70.00.

I have a feeling that speed calculator is not accurate for the simple fact I don't have the final gear radio of the KD direct drive tranny. They give the final ratios with a pinion and spur but not the tranny alone.

RC-NUT · 03:02 PM

Thanks for the help guys. After browsing the forum for a while I've decided to go with the 1518. I really like the 1717 due to it's size but from what I have read it's a power hungry motor. My 2s 35C 3800 packs probably won't do it.

Worst case I'll buy both but I'll most likely go with the 1518. I can always bump the voltage in the future.