Their 6 hp engine produces approx the same output as a 4hp 2 stroke engine. My conclusions based on these tests is that Tohatsu/Mercury/Nissan all the names this engine is branded under are over reporting the power produced. The difference in 800 rpm on the thrust produced is large, 1300 is simply huge. This is still 800 rpm below the 5500 rpm nominal and 1300 rpm below rated max rpm. It will with the 6 pitch prop get to around 4700 rpm. On the water not tied to a dock the engine will produce a little more rpm. Unfortuanatly even with a 6 pitch prop the engine does not produce enough power to even match the manufactures specified nominal 5500 rpm.įor this engine to output 6 hp it has to be turning the prop at 5500 to 6000 rpm. The drop in pitch actually needs the engine to turn more rpms to maintain the same speed at the top end. However on the water this does not equate to better high end performance. With the 6 pitch prop this does produce more thrust at low rpm and in static tests. With the 6 pitch prop they both turn about 4300 rpm and produce an average of 165 lbs of thrust. Both engines with the 8 pitch prop could only turn 3700 to 3800 rpm and produce an average 124 lbs of thrust. The Nissan engine produced identical test results in RPM and thrust for the static tests with both the 6 pitch and 8 pitch props as my Tohatsu. I had assumed that there were problems with my engine but based on the test results I think that there is a much larger issue. I have been wanting to do this for a while as I have the same engine only marketed under the tohatsu brand and it has run weak since I got it. The scale is a 3000 lb loadcell scale accurate to the nearest 1 lb increment. The tachometer is a Sendec unit good to 7000 rpm in 10 rpm increments. We also did this with both the stock 8 pitch prop and a 6 pitch prop. I had the opportunity to work with a friend on his boat yesterday and I took the inline scale and a tachometer with me to test the performance of the engine in a static thrust test.
First Repairs to Sea Puppy after Buying Her.x Editorial Comments on Orphan Star by karen kimbrel.
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