Hi Bill,
Only one airfoil to use.

I'm using the blades that you made which I have been flying on the other autogyro. I think the blades are 23 1/2" long. This gyro is much larger than the other one but it was built very light for electric and the Saito 70 weight about the same as the OS 52 4-stroke which I'm flying on the other one. The end result is they weight about the same. I'm heading for the field in a few minutes so we'll see how it goes.
Phil