I have a 1/3 Spacewalker with an OS 300 twin for power - I have been flying it for 14 years - with a Dynatrhust 20x8 prop. So figure maybe 5 gallons of gas a year - 14 years - 70 gallons of fuel thru it with this evil Dynathrus prop and never a problem with the engine. I don't know what has been said about Dynathrust props, but after this much time and no problems - I can't say that it really is an evil prop.

Dan