RPMs question

[pond monkey]

I have an Alumaweld Super- Vee ( 15'7" )with a 30 hp Honda and tiller control. The boat's heavy at 775 pounds with 10 degree vee bottom.....I do love the boat...<br />The original prop (a 12 pitch )was too steep at high elevations (4,500')........going to a 10 pitch made a huge difference and I don't think that top speed was hurt much at all even in lowe elevations.....<br />My question is ...It seems to be running a really high rpm.....possibly too much in the lower elevations at WOT. I would like to install a tach but was told that the motor has built -in over rev protection and not to worry.....fyi...the boat does 28mph in lower at 500 ft....haven't check it at 4,5000 ft.<br />If I purchase a tach...any suggestions?<br />Also could some one explain the difference in tilt and trim? Thank you......P.M.

 

[JB]

Re: RPMs question

Howdy, PM.<br /><br />You need a tach. Only a tach can answer your prop questions.<br /><br />"Tilt" is a 2 position function. . .up or down.<br /><br />"Trim" is a fine adjustment of the engine angle when down.<br /><br />Good luck.

 

[pond monkey]

Re: RPMs question

Thank you....P/M.