If a old Quadra 80 motor turns a two-blade 24X10 prop, what size three-blade could it turn? And now the big question, who makes them?

Dan

Rule of thumb is you drop 1 size in diameter and increase one in pitch. There usually are no odd sizes in large props so you would go to a 22 x 12. variable pitch is ok! Try R & D for wood props that are on a metal hub, each prop is seperate. Or Desert Aircraft for Carbon like Meijlik.

I had always been told that you drop 1" in diameter and use the same pitch. I've used this rule on many engines with no problems. Bolly makes 3 bladed props.

Mendes is correct, change one or the other but not both. Dan, if you want a really beautiful prop call Tonaya, pronounced Tonya, at Fox and talk to her about a PK plus prop, I think she can get any size. I got a three blade 16x11 for my RCV .90, it's a work of art.

Menz makes wood 3-blade props, Mejzlik, Fuchs, Engel, Air-Models, Cleveland Cyclonics, and Bolly make carbon fiber 3-blade props.

For sources...Desert Aircraft, Aircraft International, Fox, TNT Landing Gear.

Dan, from an old Hal DeBolt article, he said that if you keep the same pitch then multiply the two blade diameter by 90%. This would be 21.6", therefore, a 22x10 three blade prop should turn about the same rpm.

Ken

Isn't RC Universe great! One day and I got my multiple answers.

Thanks everyone!


Dan