HP-SS Prop

[excalibur-oc]

I hope I am in the correct forum, this time.
I had recently discovered these forums & cannot believe they exist - I am amazed that this kind of spirit still exists.
Anyhow in Maint & repair regarding fuel effic. I was sent here I think here, to discuss my set options with regards to prop. by texas mark

forums.iboats.com/bbBoard.cgi?a=viewthread;fid=28;gtid=1151712
There are some pics on the above thread.

Ok here goes
The motor is an 81(thanks Em) 175hp John with a michigan 19" prop. 3 blades not sure what style is
The boat is a wellcraft 185 sport airslot with 2 inboard 60litre tanks
WOT she pushes 38mph (GPS) 2 adults 1/2 capacity fuel - lake like glass
RPM's were in the 5800 range before my cuurent issues - see thread TACHOMETER RACES HIGH

Only once 4 yrs ago have i cavitated her at the top of trim.
I do know that I have no more capability to lower engine - on last hole

We (actually You guys) found the fix for my tach & it appears to be ok now so I will be able to monitor any changes while I adjust the set up.

Tks Ex

 

[excalibur-oc]

Re: HP-SS Prop

I just reread my post & I did not really specify what I need advice on.
I calculated my slip to be 25% - that I would like to improve.
Hole shot is not overly important to me seein' how i mainly pull a tube for water fun.
Fuel consumption is a major concern.

Any advise is welcome

Tks Ex

 

[walleyehed]

Re: HP-SS Prop

if you drop pitch to lighten the load on the engine for pulling, your fuel milage will improve.