Gear ratios?

[matta757]

Hey guys,

Ok, I understand some physics, but I just need a little nudge in the right direction on this one

When selecting gear ratios for my motorized throttles, is there any type of advantage to having a larger gear on the throttle lever and a smaller gear on the motor? For instance, right now I am looking at a 3-1 ratio (approx.) with 35 teeth on the throttle gear and 11 teeth on the motor, simply because I have 10 rpm motors and that's the math that works out for getting the proper speed.

However, I can get motors with less RPM's (all the way down to 1 rpm) and looking at gears, I can save some money by using a smaller ratio, say 2-1 or even 1-1 because the gears are cheaper. But is using a ratio like 1-1 something that I shouldn't do? Again, I go back to my original question, is there an advantage to a larger ratio?

Any help would be greatly appreciated!

Matt

[Boeing Skunk Works]

If you use a larger gear on the motor with less RPM, the motor will have to produce more torque for the same amount of travel.

[Aerosim Solutions]

Mike is right, if you have a larger gear on your motor more torque will be required. It would be best to have a motor with higher RPM and a small gear on it driving a large gear on the bottom of the throttle lever. Matt I can make gears for your TQ levers any size and any ratio you require rather than trying to find a pair of gears that might do the job. I will be starting my own motorized B737TQ soon and will be following this path using geared DC motors. I can supply your gear sets for AUD$15.00 (per lever). The larger gears will only have to be partial gears probably, if you can draw what you need I can make it no problem, gears are easy!

Cheers Gwyn