Underpropped 280 regal ????

[crazy charlie]

I have a 280 regal with a 10ft beam.Its a big cruiser,twin 5.0lx mercr.,with alphas.weighs around 9-9500 lbs.Factory props are 141/2 x 17 and the boat cruises nicely with them.If it is choppy and I trim the drives up,they cavitate before they trim up much.I know I am not trimming them up too much because it cavitates so quickly and the drives are still way down.Could I be underpropped????? Charlie

 

[crazy charlie]

Re: Underpropped 280 regal ????

Cmon guys,Im dying here,any help?????????

 

[Northern Eclipse]

Re: Underpropped 280 regal ????

Got a couple of questions Charlie... are your props aluminum or SS.. what's WOT rpm..what type of Drives do you have Alpha, Bravo with this info I may be able to give some helpful feedback

 

[Northern Eclipse]

Re: Underpropped 280 regal ????

Sorry Charlie I see that you did mention you had alpha drives.. I just thought of one more thing are the props cupped?

 

[crazy charlie]

Re: Underpropped 280 regal ????

Thanks for the reply Northern Eclipse.The props are new ,alum. and I assume they are cupped.I have to check the wot,the boat is new to me and I have not really nailed it yet.Twin 5.olx mercr. i/os with alphas.It is a wide and heavy boat,I cruise nicely at 32-3400 rpms with plenty left to go.I just cant trim it up,as soon as I trim up a little I can hear the sound of cavitation. Charles