That pic is priceless! Wish that I would have had it for the book Dyno Testing and Tuning!
Instead I used a pic of a real live prop dyno system when mentioning "prop dynos".
Note how the rear wheels are clamped? Guess all was well until it slips the contact patch?
However, it does reek somewhat of a certain proponent of propeller powered vehicles doesn't it? Perhaps from the same gene pool.
Regards,
HB2