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 I plan to put one in a Midget Mustang.

 Thanks,
 Jeff

The front main bearing (rear in the car) is fine for prop loads. The
problem is thrust loads.
Perry Mick destroyed the front thrust bearing in 650 hours with direct
drive ducted fan. It can be redesigned by doubling up on the needle
bearings. Minor mod.

The problem is the power to weight ratio is bad in direct drive at 3500
RPM  unless you spend big bucks
 on aluminum  end housings. The 16X would be better if it ever
appears. The 56 inch prop is also rather inefficient at low speeds.

Jeff, it would be cheaper to build or buy an RV4.

Paul Lamar

Anyone thinking of building a Midget Mustang better sit in one before
investing time or money in the project.  At 5' 10" my head hits the canopy
of my neighbor's MM.  BTW, it is a 200 hp stretched MM, with Constant Speed
Prop.

Tom Parkes
20B Lancair ES