Is there a recommended servo for rig weights that I could be enlightened on?
Thanks....
Not that this is the thread for that, but here's the general rule of thumb for figuring out if the servo will work:
1. Find out the oz-in torque rating that your winch does at the voltage your run. For example HS-645MG is 133 oz-in at 6.0V. I understand this rating means with a servo horn 1" long, it will move at most 133 oz of weight before the motor stalls out.
2. Convert oz to lbs, remember that there are 16oz in 1lb, so the HS-645 would have 8.3125 lbs of pulling force @ 1" from the center of the servo horn.
3. Determine your winch spool radius - for this, spool up the winch with as much winch line as you might need, then measure how far away from center this is. For example, my winch spool radius is 1/2".
4. This step might lose a few people, but makes the math work out. Multiply the Pulling force at 1" by the reciprocal of the spool radius. (Reciprocal means to flip the fraction, so 3/8 reciprocal is 8/3...) For example: 8.3125lbs x 2/1 is 16.625 lbs of force at 1/2"
5. As a winch spools out, the torque actually increases and linear speed decreases so, the above number is the minimum torque that your vehicle has. As long as this number is about 125% of the weight of your rig, you should be fine for anything where your wheels aren't wedged in anything.
The reason we are looking for the strongest (most scale) winch line is that even with a 10lb rig, and only 20lb servo torque, there are times when the wheels are wedged, or stuck in mud, or the vehicle slips back and tugs on the line, or the most common event; the winch line abrades and creates a weak point.
Hope the above helps a few people understand how to pick a servo for winch duty or not.