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Propellers for Yanmar 1GM10

 

I am interested in what props you with Yanmars are using. I have always had
a 14x10 which it really too long as there is only about 1/4 inch between the
top of the prop and the hull. I can run about 6.5 Knots at 3400 RPM or
cruise at a little over 5 at just under 3000. Not sure I could do much
better but I am thinking about a 1000 mile river trip in a year or so.

Mark
Nashville
#15
Mark Swart
 

I just bought a 12 X 10 Martec folding but it's not installed yet. Most of what I found pointed to a 13 X 9 as the recommended size, but I don't do much motoring and found a good deal on this one. My main priority was the folding aspect.
 

Hi Mark,

I measured my prop last weekend. It is 12" (can't find a pitch marking). and leaves about 1-1/4" clearance to the hull. I max out at about 5.5 knots, so you may already have the highest output setup. Over the course of 1000 miles, I bet you'll appreciate it.

Bob
MarkS
 

I had my first run last weekend with my 12 X 10 Martec two blade this weekend. Pushed it right up to 5.5 knots, might be able to squeak a little more but wouldn't want to run the engine that hard for long.
Less reverse thrust than the three blade it replaced, but the extra sailing speed is worth it : )

--- In s227classassociation@..., Bob Taylor <woodwork@...> wrote:

Hi Mark,

I measured my prop last weekend. It is 12" (can't find a pitch marking).
and leaves about 1-1/4" clearance to the hull. I max out at about 5.5
knots, so you may already have the highest output setup. Over the course
of 1000 miles, I bet you'll appreciate it.

Bob
jr_cann
 

--- In s227classassociation@..., "MarkS" <mark_swart@...> wrote:

I had my first run last weekend with my 12 X 10 Martec two blade this weekend. Pushed it right up to 5.5 knots, might be able to squeak a little more but wouldn't want to run the engine that hard for long.
Less reverse thrust than the three blade it replaced, but the extra sailing speed is worth it : )
Marc,

The important question is what RPM were you able achieve @ full throttle? (BTW, often tachometers maybe off by 10-15% and need calibrating with a strobe). Ideally you should be able to get max RPMs.. at least 3400 at full throttle. AND! There should be no black exhaust smoke after running full throttle for 5-10 mins. If you cannot achieve 3400-3600 RPM and/or there is black exhaust smoke, there is too much pitch. <this assumes a clean bottom> An over-pitched situation, leads to carbon deposits in the exhaust elbows and other internal parts. Yanmar mechanics I know suggest running at 3000 RPMs plus as a rule to reduce carbonization.

I would expect that you should be able to achieve about 6 to 6.6 knots.
 

Mark,

We have a MaxProp folding 3 blade on our S2-27. 12x9.2 set at a 22 degree pitch if the documentation I have is still accurate. We have a 2GM20 in our boat not the 1GM10. I haven't checked the speed lately, but when I got the boat and took it up the Neuse River to get it hauled out I recall we were making ~6kts at ~3000 rpm according to the GPS. We'll have to get together to compare our two boats.

--- In s227classassociation@..., "Mark" <Mark@...> wrote:

I am interested in what props you with Yanmars are using. I have always had
a 14x10 which it really too long as there is only about 1/4 inch between the
top of the prop and the hull. I can run about 6.5 Knots at 3400 RPM or
cruise at a little over 5 at just under 3000. Not sure I could do much
better but I am thinking about a 1000 mile river trip in a year or so.

Mark
Nashville
#15
MarkS
 

I was out yesterday and did a full throttle run -- it revved to 3600 with no issues and GPS was showing between 6 and 6.5 (my onboard knotmeter doesn't work). No smoking problems. I think the 12 X 9 is fine, I don't know what the 13 X 9 advantage would be, unless it provided a little more thrust in reverse.

--- In s227classassociation@..., "Brian" <bsmokler@...> wrote:

Mark,

We have a MaxProp folding 3 blade on our S2-27. 12x9.2 set at a 22 degree pitch if the documentation I have is still accurate. We have a 2GM20 in our boat not the 1GM10. I haven't checked the speed lately, but when I got the boat and took it up the Neuse River to get it hauled out I recall we were making ~6kts at ~3000 rpm according to the GPS. We'll have to get together to compare our two boats.

--- In s227classassociation@..., "Mark" <Mark@> wrote:

I am interested in what props you with Yanmars are using. I have always had
a 14x10 which it really too long as there is only about 1/4 inch between the
top of the prop and the hull. I can run about 6.5 Knots at 3400 RPM or
cruise at a little over 5 at just under 3000. Not sure I could do much
better but I am thinking about a 1000 mile river trip in a year or so.

Mark
Nashville
#15

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