Matching Drill and Chiaphua

[sanddrag]

If I want to design a drivetrain to have both a drill motor and a Chiaphua motor linked up, it would be very easy to match the no load speed of the motors. However, when under the same load, the motors would not have the same RPM because their torque speed curves are different. If under the same load the drill was spinning at 100 rpm and the Chiaphua was spinning at 50 RPM, Not considering a reduction, would the system average out and spin at 75 RPM? What I'm afraid of here is that even though the motors will be turning the system in the same direction, one being faster and the other being slower while both under load will cause them to fight. You cannot match RPMs from 0-max for all different load conditions so how should you match the RPMs. Where on the torque/speed curves should you gear the motors to match RPM?

In a nutshell, will adding the Chiaphua motors to a drill motor drive system have a significant increase in power over just the drills alone?

Also, if someone could address the first paragraph that would be very helpful to us all. Thanks.