Aeroguy,

Buddy if all you are looking for is to calculate Static thrust then why not put a spring behind the tail wheel.

I've been using it for years to test different prop efficiencies. A thrust to weight ratio of about 1.5:1 is a minimum for 3D aircraft, however 2:1 would be the ideal.

I am most likely to generate a lot of abuse regarding my simple method, but it has always worked for me.