Difference in opposite turning props

[supercub]

Aircraft equipped with contra-rotating propellers, also referred to as CRP,[1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston or turboprop engine to drive two propellers in contra-rotation (rotation about the same axis in opposite directions). Two propellers are arranged one behind the other, and power is transferred from the engine via a planetary gear or spur gear transmission. Contra-rotating propellers should not be confused with counter-rotating propellers—airscrews on separate shafts turning opposite directions.
I didn't know the difference, so looked it up. Thought I'd share this.
Brian

[FlyKidChris]

Re: Difference in opposite turning props

In theory, contra-rotating propellers are more efficient. However, theory doesn't always equal reality.

Obvious disadvantages to contra-rotating props is the extra weight and complexity.

Still, Precious Metal just looks awesome with one, doesn't she?