Ok I have recieved the inline scale I purchased and have tested for static lbs of thrust that my 4hp johnson outboard provides on my sailboat. The scale is rated from 1 lb to 3000 lbs in 1 lb increments with a digital readout and is certified. I tested three times to make sure it was consitent. I also created a bridle from the aft deck cleats to tie the scale to so that thrust was measured by pulling on a line that ran down the center of the boat from the bow to the center of the transom.
at an idle 15 lbs of thrust +- 1 lb
at half throttle 60 lbs of thrust +- 2 lbs
at full throttle it varied by about 10 lbs ranging from 120 lbs of thrust to 130 lbs of thrust. This was not a variation from one test to the next but a variation within each of the three tests while at full throttle.
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