RE: Need Basic Training!
You really can't do electric conversions without getting involved in the number-crunching game, unfortunately. It's not a matter of sticking a motor in that "looks right" like you do with a glow engine. Motors don't produce power, they HANDLE the power provided by the battery, and it's very easy to come up with a setup where the motor can't handle the power, or is handling too little to fly the plane. One thing you'll want to remember is that Volts are the "cubic inches" in electric flight.
To tell whether the electric motors you have will work with the planes you're trying to convert, we really need more information. Could you please list the specifications of both the Tiger Moth and Puddlemaster? Wingspan, wing area, weight (both empty and ready-to-fly), and anything else you think might be helpful. With this information, we'll see what we can do with the stuff you have and/or tell you what you'll need to get.
As a rule of thumb, 1/2A planes can generally be powered by Speed 400 motors and relatively lightweight 8-cell batteries. For a slow-flying Tiger Moth, adding a gearbox will convert more of the power into thrust instead of speed. A standard Speed 400 geared setup, which MIGHT work well on that Tiger Moth, is a Speed 400 6V motor, an 8-cell KAN1050 NiMH battery pack, a 3:1 gearbox, and a 10x7 APC Thin Electric prop. You'll also need an electronic speed control such as the Castle Creations Pixie 20.
"Turbo 550" motors, and other "550" motors are the same as the Speed 600 motor. These can sometimes be used in .15-sized glow planes with an 8-cell NiCd or NiMH battery.
The numbers are simple model numbers. They tell you nothing about the capability of the motor, similar in the way that "Chevy Tahoe" doesn't tell you anything about the vehicle. You only know the Tahoe is a large SUV because you looked at the specifications. Such is the case with electric motors...