Hello 36'ers
My 1989 C36 #1015 is on the hard this week since the first time we bought her in San Diego almost 2 years ago.
The issue is that my Martec 2 blade folding prop is done. The holes are worn out and the thing looks like its been used as part of the sacraficial metals chain under my boat (bad pitting).
.The current prop numbers are RH16X10 - 10P 3
I can motor all day (and all night) at 2800 rpms making about 5.5 kts. It just seems to me that she should motor well over 6 kts. I am not sure if I have the M25 or the M25XP. I have a call into catalina to see if they can help with the HIN # to determine which is which.
Has anyone gone to a 16x10 12P?
If so how did the motor behave?
at 2800 to 3000 I have no smoke (indicates lugging) from the engine whatsoever.
Any suggestions comments appreciated.
thanks in advance
Capt Bill
Maverick
#1015 std rig Fin keel
Martec Folding Prop
Tue, 03/24/2015 - 13:31
#1
Martec Folding Prop
Have you checked to see if your tac is correct?
Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1
Bill,
I second the suggestion by Bill Miller. Check your tach. I'm guessing you are motoring at an RPM far less than 2800.
The M25XP was first seen in 1987 model C36's, so if you have a three cylinder Universal, it is most likely the M25XP.
Prop sizing is generally labeled as (direction) diameter x pitch x bore, so there is no such thing as a 16x10, 12 pitch. It would be a 16x12. It seems like your prop was stamped by the Office of Redundancy Office :-) Also I'm wondering what the 3 is. A three bladed prop? If so, you've got the wrong prop. A 16x10 two blade is a fairly large prop for the M25XP (another reason I think your tach is off). Most C34s and C36s came from the factory with either a 15x9 three blade or a 15x10 two blade prop. A 16" prop would not be recommended by many because of prop tip clearance with the hull. A 16x12 prop would be overkill with the M25XP. You would not be happy with it. I'd suggest checking the tach first. Hope this helps.
Tom Sokoloski
C36/375IA Past Commodore
Noank, CT
Folding prop replacement project update with photos
I have decided to stay with the 16X10 spec prop that came off the boat. This should be ready late next week from Martec.
Removing the very corroded shaft was easy with a large cutting wheel. The prop shaft came out easy in 3 pieces.
The coupler is in good shape so that's one less thing to buy.
The packing gland is green and I am going to take it to the wire wheel and loosen the nuts to see if it can be saved.
The cutlass bearing is ordered as well.
I use catalina direct for parts because it has been my experience that they have a great working knowledge of catalinas in general and I know that I will get the right part for my boat the first time around.
I have sent along photos of the parts removed and the back of the transmission.
One bonus here is that the shaft log is in great shape!
Capt Bill
hull #1015
std rig fin keel