Hmm,

I thought the Forum was "Extreme Speed Prop Planes"

Having the knowledge on how to properly operate high performance equipment with the minimum risk should be your goal.

Perhaps you can scan one of these so call manuals and stick it to the top so we can all see.

When you have engines that operate at RPM's exceeding 25K in the air and you want to break it in on a test stand at the same RPM or slightly above, you use a special test prop. Plainly, Duane made a near fatal mistake in his choice of test club. I was exposed early to people who knew enough about these procedures to show me the correct methods. They had designed, built and operated high RPM engines for decades. I also worked for a propeller manufacturer that made a rather large line of speed props starting back in the 50's, so I think that perhaps he knew a thing or two about the subject.

Putting a smaller diameter and lower pitch prop on an engine to achieve the high break-in RPM is not safe. Why? Because the hubs are not sized to withstand the loads. Cutting down a larger wood prop is. Cutting down a plastic prop is not.

I'm not too concerned about my racing buddies. They operate under a pretty tight rule structure developed with safety in mind. What does bother me is the extreme speed mentality that does not have much experience and sometimes rather poor judgement