pvanv
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HT Prop Pitch Update - 2009/04/29 12:41
Last season, I installed a new Nissan 9.8 on my 8,000-pound, 28-foot sailboat, rigged with the 5" pitch x 8.75" diameter, 4-blade HT prop. The factory tach showed max RPM's in excess of 6,000, maybe up to 6,200 -- just below the rev limiter point. The correct WOT range for the motor is 5,000 to 6,000.
This season, I changed to the 7" pitch version of the HT prop, to lower the max RPM's. What's surprising is how MUCH it slowed the motor down. Now the tach only makes it up to barely 4,900 or 5,000 at WOT.
Seems my ideal pitch will be 6", which is not a stock, off-the-shelf prop. I'll see if my local prop shop can re-pitch one of my props to 6".
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