prop diameter

[dhammann]

I have a 3.0 alpha I which runs a 14x19 prop. I recently changed to a 14.8x19 and now I am thowing arooster tail, it is only 1/4" from hitting the trim tab and the trim tab extends down about 1.5" lower then the blades. Do I have a problem? The boat seems to run fine.

 

[Spidybot]

Re: prop diameter

Hey,<br /><br />It sounds as if it's too close to the tab (and other parts?).<br /><br />If the boat performs you may ignore it - on the other hand, any energy spend on roosters or other gimmicks are signs of power being used for other purposes than driving the boat.<br /><br />I'd suggest you read about props and more, in theoty and practise: Wisdom of propellers

 

[Bob_VT]

Re: prop diameter

Mercruiser sells a modified trim tab for oversize props and on some occasions the tab is eliminated completely.<br /><br />As long as your prop turns without interferance you are okay. Did it change your speed or rpms??? <br /><br />Bob

 

[dhammann]

Re: prop diameter

Thanks guys, My cruising speed & rpm's are about the same. I haven't tried wot yet. I'll let ya'll know next week. I will try removing the tab, it was broken off one time and I did not notice any difference. I replaced it for corrosion protection only.

 

[dhammann]

Re: prop diameter

I tried WOT this weekend, hit 40mph at 45k rpm. About the same speed as the old 14" prop but 150 rpm's less. All ist klar! (everything is OK)

 

[Spidybot]

Re: prop diameter

Sehr Gut! Aber... 45k rpm... 45000? Is it a turbine?