Doc, since you are going to build your own dyno I suggest
a few modifications. I made the mistake of not thinking of
the balance with the engine and firewall forward package
on there. Here is my revised dwg.

The disk brake 3D looks like it will work but it is actually very
dangerous as red hot large truck disk brake rotors WILL explode
at 7500 RPM dissipating 250 HP or 186.5 KW. Just in case this
idea occurred to you.

Use a PSRU and some sort of prop load.
A stock prop will limit the RPM to static so consequently
static RPM will be the highest RPM you can measure the HP.
You need to measure the takeoff HP at 7500 eng. RPM so a smaller
diameter prop is called for.

I suggest making a smaller diameter test club out of a few
clear white pine boards as in the 3D. The tensile strength
to density ratio is more favorable than red hot cast iron
not to mention the RPM is one third.

Paul Lamar ...No rotor no motor.

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