Top speed race class - Page 4 - RC-Monster Forums

tashpop · 01.31.2008, 08:34 PM

here is a cheap 200amp esc to try out if you can find one instock anywhere.
http://www.himodel.com/electric/HiMo...200A-OPTO.html

BL_RV0 · 01.31.2008, 08:36 PM

make sure you get some flightpowers!

jzemaxx · 01.31.2008, 08:36 PM

So which motor setup and ESC do you suggest. The the dual 7L's with dual mamba's a good choice or something better out there???

jzemaxx · 01.31.2008, 08:38 PM

Won't the VXL3 from my Velineons support 200A cont. and 320A burst. I could always buy those again and the 7L's. But later I would like to go even faster with 4 or 5S but the VXL3's are limited to a retarded 3S.

BL_RV0 · 01.31.2008, 08:41 PM

if u got the cash, get a savage with dual 6xls, dual 3s 30c fp's and the 3 speed. or dual plett maxximums?

BL_RV0 · 01.31.2008, 08:42 PM

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.5833333333333332
Other Ratio: 0.967741935483871
Spur Tooth Count: 51
Pinion Tooth Count: 24
Total Voltage: 12.6
Motor KV: 3100
Tire Diameter (inches): 5.7
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 2.13 : 1
Total Ratio: 10.77001 : 1
Tire Circumference (inches): 17.91 inches (454.84mm)
Total Motor Speed: 39060 RPM
Vehicle Speed: 61.5 MPH (98.79km/h)
Effective Speed Rate: 4.88mph/V (7.84kmh/V)
Effective KV Value: 3100
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

thats with the maxximum if your wondering.

jzemaxx · 01.31.2008, 08:43 PM

Which ESC's though??

I already have a stock 3906 waiting for the upgrades.

BL_RV0 · 01.31.2008, 08:44 PM

mamba maxes maybe or quark 125's or mgm....

squeeforever · 01.31.2008, 08:53 PM

Why not read my post on page 3?? Dual MM 57 or 6900's or perhaps 1509s....

BL_RV0 · 01.31.2008, 08:54 PM

yea, i think the mambas would b good but my post of the 69's was shunned.

suicideneil · 01.31.2008, 09:03 PM

Quark = no, too prone to overheating and requires extensive modification to run cool.
MGMs = safe bet, reliable, and plenty of high amperage models to choose from.
MMs = maybe, but they really cant take a massive amp draw for long periods.

The V-twin idea is simplest since you already have the escs, but you have to concider that the motors only have very short magnets inside that long can, so they should ideally be replaced with a similar Kv feigao motor, the 7L is 3500 isnt it?

As for the stock truck, once its beefed up to 3.3specs then you can have a bit of fun with it- I assume this race series is an ongoing thing and not just a one-off event. It seems like the VXL escs have the best continuous amp rating of most escs currently available for cars, and they are well priced for their specs. You could experiment with different motors until you find something that pushes the esc and batts to their limits... a couple neu 1509 1ys (3600kv) would be interesting on 3s, and they could be geared higher than the feigaos without overheating as much- then you will find the true limits of the VXL escs.

jzemaxx · 01.31.2008, 09:21 PM

How about 2 1515 1D's?? Looking at them on Brian's calculator they seem to make great amount of power on 11.1's.

jzemaxx · 01.31.2008, 10:12 PM

According to the calculator as well the Feigao 6L's seem to be spot on with 11.1v's, but I thought the rpm limit on the 6L's was higher then 40K? I just compared it to the 1515 1D and they seem to be about identical, or am I missing something. Also the price is more then twice for each motor....wow.

SpEEdyBL · 11:45 PM

Two 5700s will will do it. If one 5700 is enough to push a 5bl truck to 65 mph, two 5700s will be able to push a 10lb to the same speed even easier since there is less than twice the wind resistance. The velineon motor btw is closer to a cm4600 motor, so that is not an alternative.

I recommend that you DO NOT get 6xls or 7ls or you will need twice as much batteries. Batteries supply the power. NOT the motor. Also you want to limit the rotational mass as much as possible.

Also, when you decide on batteries, try to get the biggest cells you can without having to put them in parallel. For example, two 3s1p 5000 mah packs would work better than two 3s2p 6000 mah packs.

jzemaxx · 01.31.2008, 11:55 PM

Here is the spec sheet... for the MM5700's of course 2 of them....

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 62
Pinion Tooth Count: 22
Total Voltage: 11.1
Motor KV: 5700
Tire Diameter (inches): 6.7
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 2.82 : 1
Total Ratio: 14.67839 : 1
Tire Circumference (inches): 21.05 inches (534.64mm)
Total Motor Speed: 63270 RPM
Vehicle Speed: 85.92 MPH (138.01km/h)
Effective Speed Rate: 7.74mph/V (12.43kmh/V)
Effective KV Value: 5700
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

Although I highly doubt that 85mph will be done with only 2-11.1V's....lol.

Here is the 6L's.....

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 62
Pinion Tooth Count: 22
Total Voltage: 11.1
Motor KV: 4096
Tire Diameter (inches): 6.7
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0043
Spur/Pinion Ratio: 2.82 : 1
Total Ratio: 14.67839 : 1
Tire Circumference (inches): 21.05 inches (534.64mm)
Total Motor Speed: 45465.6 RPM
Vehicle Speed: 61.74 MPH (99.18km/h)
Effective Speed Rate: 5.56mph/V (8.93kmh/V)
Effective KV Value: 4096
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

And lastly the 1515 1D's, which are $$$$.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.83
Other Ratio: 1
Spur Tooth Count: 62
Pinion Tooth Count: 22
Total Voltage: 11.1
Motor KV: 4100
Tire Diameter (inches): 6.7
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0025
Spur/Pinion Ratio: 2.82 : 1
Total Ratio: 14.67839 : 1
Tire Circumference (inches): 21.05 inches (534.64mm)
Total Motor Speed: 45510 RPM
Vehicle Speed: 61.8 MPH (99.27km/h)
Effective Speed Rate: 5.57mph/V (8.94kmh/V)
Effective KV Value: 4100
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

Quote:

Originally Posted by SpEEdyBL

Two 5700s will will do it. If one 5700 is enough to push a 5bl truck to 65 mph, two 5700s will be able to push a 10lb to the same speed even easier since there is less than twice the wind resistance. The velineon motor btw is closer to a cm4600 motor, so that is not an alternative.

I recommend that you DO NOT get 6xls or 7ls or you will need twice as much batteries. Batteries supply the power. NOT the motor. Also you want to limit the rotational mass as much as possible.

Also, when you decide on batteries, try to get the biggest cells you can without having to put them in parallel. For example, two 3s1p 5000 mah packs would work better than two 3s2p 6000 mah packs.