I have 2 Atr willys jeeps built at the moment and just wondered which is more efficient and which has more torque ? . One has xl drive three24t in a row ,axle 12/20 and hub 8/24 .The other has xl drive 12/20/12/20 4t/4t hub 8/24. Thanks , Badger

Im not so sure I understand the gearing on your first Jeep but on the second one the final gear reduction is 1:8.337. It is easy to calculate the gear reductions from the Gear Calculator found on many Technic websites. I think that the gearing of your second Jeep would be very a nice climbing vehichle is the weight is distributed properly and the gear arent slipping. To answer your question I would just assume that the second Jeep Willys has more torque.

Im not so sure I understand the gearing on your first Jeep but on the second one the final gear reduction is 1:8.337. It is easy to calculate the gear reductions from the Gear Calculator found on many Technic websites. I think that the gearing of your second Jeep would be very a nice climbing vehichle is the weight is distributed properly and the gear arent slipping. To answer your question I would just assume that the second Jeep Willys has more torque.

Thanks , the first is 12/20 the 8/ 24 and the second the gearing is 12/20 4/4 (nob gears ) 8/24

Here are two excellent resources to determine gear "efficiency":

Nico71's TTools v2.0 on BrickTruckTrial.com .

Sariel's "Gears Tutorial" -- scroll down to paragraph 5 (Efficiency) 2/3 of the way down the webpage.

Edited June 8, 201113 yr by DLuders

The three 24t gears in the first Jeep, and the 4t/4t setup on the 2nd Jeep don't change your torque or efficiency much. If I'm reading your first post correctly, the second Jeep has an extra 12/20 set of gears, and therefore will product more torque than the first Jeep.

I thought TTools was developed by Nico71.

The three 24t gears in the first Jeep, and the 4t/4t setup on the 2nd Jeep don't change your torque or efficiency much. If I'm reading your first post correctly, the second Jeep has an extra 12/20 set of gears, and therefore will product more torque than the first Jeep.

But the 12/20 12/20 is just 1 set , not 2 (small to large small to large ) The middle one is useless . thanks :)

But the 12/20 12/20 is just 1 set , not 2 (small to large small to large ) The middle one is useless . thanks :)

Ah, ok. If all 4 gears are placed in a row, then your net result is equivalent to a single 12/20 setup. If that is the case, then both Jeeps should have pretty much the same torque.

Since both your Jeeps use a XL motor, the best way to determine which one has the most torque is to see which Jeep is slower.

Or you could just do a tug of war!

There is much more to efficientcy than just the gear ratios, for example, worm gears are not as efficient as the same reduction done using spur gears. The use of ujs or cv joints can also have an effect. Then there's the friction of the drive train with in itself can be affected by many things like twisting of the chassis. So if you really wanna know which one puts more of the power from the motor to the floor, just do a tug of war.

Edited June 8, 201113 yr by allanp

Or you could just do a tug of war!

There is much more to efficientcy than just the gear ratios, for example, worm gears are not as efficient as the same reduction done using spur gears. The use of ujs or cv joints can also have an effect. Then there's the friction of the drive train with in itself can be affected by many things like twisting of the chassis. So if you really wanna know which one puts more of the power from the motor to the floor, just do a tug of war.

Thanks man :)