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-   -   Is this okay (https://www.rc-monster.com/forum/showthread.php?t=9766)

rchippie 01.25.2008 10:55 PM

Is this okay
 
Is the gear ratio okay ?. Lehner 1950 8t hi amp with fp lipo's


Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 18
Total Voltage: 14.8
Motor KV: 1634
Tire Diameter (inches): 4.43
Tire Ballooning (inches): 0
Motor Current Draw: 60
Motor coil Ω: 0
Spur/Pinion Ratio: 2.56 : 1
Total Ratio: 8.45299 : 1
Tire Circumference (inches): 13.92 inches (353.5mm)
Total Motor Speed: 24183.2 RPM
Vehicle Speed: 37.7 MPH (60.57km/h)
Effective Speed Rate: 2.55mph/V (4.09kmh/V)
Effective KV Value: 1634
Motor Torque: 0.26 ft-lbs
Final Torque: 2.19 ft-lbs

jhautz 01.25.2008 11:39 PM

looks great. whats it on? esc? batteries? a little more info would be usefull in an evaluation.

lincpimp 01.25.2008 11:44 PM

I would say 5s would be better, motor speed is a bit low. However if it is in a buggy it should be ok.

rchippie 01.26.2008 07:27 PM

LINC

I understand 5s would be better for the 1950 but im not sure 5s would fit under the body. I would rather have a 1940 but i cant find one i can afford :lol:.

Jhautz

The esc is a MM the lipo's are flightpower all of this is in my jammin buggy.

lincpimp 01.26.2008 07:51 PM

I am sure a 5s 4000 pack (or something like that) would fit, but I do not know your intended setup. If you have the motor, esc, battery, etc go ahead. I am sure that it will be fine, you have good equipment there!

rchippie 01.26.2008 08:19 PM

Quote:

Originally Posted by lincpimp (Post 144057)
I am sure a 5s 4000 pack (or something like that) would fit, but I do not know your intended setup. If you have the motor, esc, battery, etc go ahead. I am sure that it will be fine, you have good equipment there!


I was only asking about the gear ratio i posted for the 1950 8t hi amp. :lol:

jhautz 01.26.2008 08:24 PM

Gear ratio looks fine...even a little conservative. You could probably go up a few teeth and still be fine, but that shold be great for a track setup.

lincpimp 01.26.2008 08:33 PM

Quote:

Originally Posted by rchippie (Post 144067)
I was only asking about the gear ratio i posted for the 1950 8t hi amp. :lol:

Ok, your gear ratio is too high for that motor to run most effeciently.

rchippie 01.26.2008 10:55 PM

Quote:

Originally Posted by lincpimp (Post 144070)
Ok, your gear ratio is too high for that motor to run most effeciently.


I have a 15t on it know . what would you recomend ?. I got beat by a stinkin 9L last weekend :surprised: :lol:. We used GPS i topped out at 31.7 while skellyo's mbx5 & 9L went 41.3 .

skellyo 01.26.2008 10:57 PM

Quote:

Originally Posted by rchippie (Post 144087)
I have a 15t on it know . what would you recomend ?. I got beat by a stinkin 9L last weekend :surprised: :lol:. We used GPS i topped out at 31.7 while skellyo's mbx5 & 9L went 41.3 .

No, no, no...it was 43.4mph :mdr:

Although, I do believe the MBX5 is going to be torn down here shortly and donate its MM ESC to the CRT.

rchippie 01.26.2008 11:06 PM

Quote:

Originally Posted by skellyo (Post 144089)
No, no, no...it was 43.4mph :mdr:

Although, I do believe the MBX5 is going to be torn down here shortly and donate its MM ESC to the CRT.

there is no need to rub it in :lol:.

lincpimp 01.27.2008 12:20 AM

I would say that the motor should make plenty of torque, just gear it up until something gets too hot! Keep an eye on the temps and you should be ok. I see no reason why 18/36 will give you any issues. You just have to make up for the lower motor speed with higher gearing. Not the best way, but most certainly cheaper than a new esc and batteries. Now if you were trying to get 50mph out of that setup you may have issues, but 40mph sounds realistic and definately do-able.


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