Gary Wolf wrote:

Paul,
   I tried using a disc brake and caliper with bathroom scale many years
ago. It is difficult to modulate the pressure to get a stable rpm and the
pads don't last very long. Water spray only makes the modulation more
difficult. It is not something I would recommend as a means of measuring
horsepower but it could make for an entertaining afternoon. I bought a
Stuska and feed it with a high volume regulated pump and it gives repeatable
numbers.

                                                        Gary Wolf

The cut down or variable pitch prop load is the easiest and cheapest.

Paul Lamar
 
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