Spacing between prop and rudder

Leviathon
Aluminum Star
Posts: 117
Joined: Mon Jul 14, 2014 10:04 am

Spacing between prop and rudder

Postby Leviathon » Tue Jun 05, 2018 6:06 pm

So moving to a larger prop and shaft and it seems the prop is aweful close to the rudder, maybe an inch? Is there a minimum distance that is preferred. Could not have been too much more than that with the old set up.

Steve
Steve and Mary Levi
1973 32' Marinette Fisherman
Twin Chrysler 360's
El Ohssa
St. Joseph, Michigan

EWRice
Royal Aluminum Star
Posts: 258
Joined: Thu Feb 04, 2016 12:37 pm

Re: Spacing between prop and rudder

Postby EWRice » Tue Jun 05, 2018 7:27 pm

My 32 has just enough room to sneak the prop off, if you tip it just right. That is original as far as I know. The 32 that I just re powered with 1.250 shafts was about the same. It had a little more room but only because the shafts were set up for castle nuts where mine are jam nuts. The castle nut shafts are about .500" - .750" shorter from rear of prop hub to end of shaft.
Muskegon Lake
1972 32' Express flybridge
"AL13"
Twin 318s
On board air & prime 920
1963 Thompson Super Sea Lancer
Graymarine 327
1961 Alumacraft 12'
'55 10hp Johnson

Joe
Tin star
Posts: 65
Joined: Wed Jul 16, 2014 6:43 am

Re: Spacing between prop and rudder

Postby Joe » Tue Jun 05, 2018 8:45 pm

In theory, the space between the back of the prop and the cutless bearing should not be more the twice the diameter of the shaft.
1988 sedan flybridge. Black / White. 318 240 hp Aluminum aft deck hard top. Louisville Ky . Tartans landing. " KNOCKEFELLERS"


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