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Prop Size for 22 foot Angler with 115 Yamaha 4 stroke
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jmcknight00



Joined: 01 May 2009
Posts: 10
City/Region: Juneau
State or Province: AK
C-Dory Year: 1990
C-Dory Model: 22 Angler
Vessel Name: C-Lyin'
PostPosted: Fri Jul 01, 2011 6:09 pm    Post subject: Prop Size for 22 foot Angler with 115 Yamaha 4 stroke Reply with quote

Just wondering if anyone has a similar setup. I just got the motor installed and am in the middle of the break in right now. I just ordered a doel fin to put on it as well. Thanks for the help!
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Sea Wolf



Joined: 01 Nov 2003
Posts: 7733
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
PostPosted: Fri Jul 01, 2011 7:32 pm    Post subject: Reply with quote

jmcknight00-

I only have a 90 hp Yamaha on a heavier CD-22 Cruiser, but my boat is over proped with a 17 inch by 13.5 inch diameter prop, and finds a 15 inch pitch prop more satisfactory.

With your Angler, lighter weight, and 115 hp Yami, you should be able to use the 17 inch pitch prop to the fullest and into the ideal rpm range from 5500-6000.

The prop diameter should stay at about 13.5 inches.

All bets are off if you carry a lot of extra fuel, camping gear, crab pots, passengers, dogs, and coolers full of ice, beer, and fish! Laughing

Have a great weekend!

Joe. Teeth Thumbs Up

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Sea Wolf, C-Brat #31
Lake Shasta, California

"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous
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Jeff & Mimi



Joined: 07 Jan 2010
Posts: 33
City/Region: Vancouver
State or Province: WA
C-Dory Year: 1987
C-Dory Model: 22 Angler
Vessel Name: Kristen Rose
Photos: Kristen Rose
PostPosted: Fri Jul 01, 2011 8:37 pm    Post subject: Reply with quote

We also have a 90 HP Yamaha on our 22FT. Angler and we are useing a 13.5 x 17 Prop and is perfect match for are boat. Fully loaded for a two week trip We have found that when we can run at about 3800 RPM, 16 MPH, we get our best fuel economy.
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Jeff, 1987 C-Dory 22FT. Angler The Kristen Rose
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jmcknight00



Joined: 01 May 2009
Posts: 10
City/Region: Juneau
State or Province: AK
C-Dory Year: 1990
C-Dory Model: 22 Angler
Vessel Name: C-Lyin'
PostPosted: Sat Jul 02, 2011 7:37 pm    Post subject: Thanks guys Reply with quote

Thanks for the help, I really appreciate it. What are your thoughts on 4 blade versus 3 blade and stainless versus aluminum?

James - Juneau, AK
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thataway



Joined: 02 Nov 2003
Posts: 11508
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Thisaway
Photos: Thataway
PostPosted: Sat Jul 02, 2011 8:10 pm    Post subject: Reply with quote

3 blade works well for this application. SS is less flex, better if you are going thru mud/sand. But for most applications Aluminum is satisfactory. I had the 115 on a boat which was slightly shorter and about the same "factory weight"--less real weight. It was a great engine, with excellent economy.

I like the Doelfin for smaller engines and smaller boats such as inflatable boats. For the bigger boats I perfer the Permatrim-larger and aluminum. Minimal flex. Both the trim tabs and a Permatrim are the best combination.

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Bob Austin
Thataway
Thisaway 2006 22' CDory November 2011
Caracal 18 140 Suzuki
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
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Home port: Pensacola FL
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Sea Wolf



Joined: 01 Nov 2003
Posts: 7733
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
PostPosted: Sat Jul 02, 2011 8:30 pm    Post subject: Reply with quote

In addition to Bob's correct assessments, I'll comment about the 4-blade prop.

It has more surface area than a three blade, hence a little more drag, and you'll also notice that it slips less with a better bite.

The result is a little less top end speed (more drag), and less flexibility in terms of speed range (since it won't slip as easily).

However, it's really better in very heavily loaded boats, like big cruisers, houseboats, workboats, tugs, and the like (better bite).

It also vibrates less with 4 blades turning rather than 3 at very slow speeds where you can feel and hear each blade turn in the water, like below 1000 rpm. Jim Gibson pointed this out to me years ago at a winter get-together in the California Delta. I drove his boat, and bought a similar prop!

Generally, then, Solas 15 inch pitch 13.25 inch diameter prop is a good alternative for a CD-22 Cruiser, particularly if you travel heavily loaded and often at higher altitudes, but probably not necessary with 115 hp!

As usual, it's a guessing game, and YMMV (Your Mileage May Vary)! Laughing

Joe. Teeth Thumbs Up
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Zricky



Joined: 25 Mar 2010
Posts: 46
City/Region: Costa Mesa
State or Province: CA
C-Dory Year: 2004
C-Dory Model: 16 Angler
Vessel Name: Spunky
Photos: Spunky
PostPosted: Tue Aug 09, 2011 12:10 am    Post subject: speed Reply with quote

so what kind of cruise speed are you getting with the 115?
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jmcknight00



Joined: 01 May 2009
Posts: 10
City/Region: Juneau
State or Province: AK
C-Dory Year: 1990
C-Dory Model: 22 Angler
Vessel Name: C-Lyin'
PostPosted: Tue Aug 09, 2011 4:05 pm    Post subject: Re: Speed Reply with quote

Well, I just left the same prop on there. It is a three blade aluminum 13.25 inch 15 pitch. I only have 9 hours on it so far, but I've been pretty happy. Fully loaded I cruise about 25 mph on the gps at 4,500 rpm. I did put a doel fin on the engine and that enables me to get up on step even at 12 mph, which is nice when it's choppy (which it frequently is in Juneau, AK). I pegged it out at about 5,800 rpm for a minute or so and we were going about 38 mph. It wasn't quite WOT, but I didn't really want to max it out. I haven't figured out my mpg yet, but it looks like it will be considerably better than my old 85hp Yamaha. I think the prop is going to work out quite well. As far as the engine size, I am happy I went with the 115 so far. It is a little heavier, but not enough to be a detriment and it's nice that I don't have to run at 5,700 rpm anymore. Thank you for all who helped!
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tpbrady



Joined: 07 Feb 2005
Posts: 879
City/Region: Anchorage
State or Province: AK
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Bidarka II
Photos: Bidarka
PostPosted: Tue Aug 09, 2011 8:18 pm    Post subject: Reply with quote

38 is fast for a 22. How was the stability? My 25 becomes a little "squirrelly" above 32. The 22 Cruiser I had was the same above 30. I've had the 25 up to 35 knots and that was way fast.
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22 Cruiser Bidarka 2004-2009
25 Cruiser Bidarka II 2010-
38 Trawler Mia Terra 2012-
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jmcknight00



Joined: 01 May 2009
Posts: 10
City/Region: Juneau
State or Province: AK
C-Dory Year: 1990
C-Dory Model: 22 Angler
Vessel Name: C-Lyin'
PostPosted: Thu Aug 11, 2011 1:14 pm    Post subject: Too Fast Reply with quote

Yes, felt a little too fast. Didn't feel real squirrelly, but still didn't want to do it very long. I like cruising about 25. Comfortable speed, and the mileage is still pretty good.
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baensch-ak



Joined: 13 Jan 2008
Posts: 34
City/Region: Prineville
State or Province: OR
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: HARMONY
Photos: G. S. Lollipop
PostPosted: Fri Jun 22, 2012 4:23 pm    Post subject: Reply with quote

Hello, prop men (or women),

We have a prop question for the Lake Powel/Yellowstone, high altitude experienced crowd.

WHAT IS THE RIGHT PROP PITCH FOR THOSE VENUES, please?

Cape Cruiser 23' with 115 Yamaha. Present prop for sea level: Michigan Wheel
stainless steel three bladed 13 3/8" diameter by 15" pitch, which works fine, sea level to 3000".

Typical load: 2 modestly dimensioned adults and long-term supplies on board.

Thank you for your feed-back, Al & Karen (HARMONY)

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Previously owned C-D 16' URSA MINOR, C-D 22' PEGASUS, Island Packet 380 FRIENDSHIP, C-D 16' G.S. LOLLIPOP, in that order. Bought 2006 Cape Cruiser 23 in 6/2010 and named her HARMONY. Looking forward to more cruising and making C-D meets! Al & Karen
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Matt Gurnsey
Dealer


Joined: 11 Nov 2008
Posts: 1530
City/Region: Port Orchard
State or Province: WA
Photos: Kitsap Marina
PostPosted: Fri Jun 22, 2012 7:21 pm    Post subject: Reply with quote

The Yamaha spec for the 115 is a WOT of 5000 to 6000 RPM. If you're hitting 5800 the you're dead on where you want to be. I wouldn't change a thing.
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Matt Gurnsey
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www.kitsapmarina.com
360-895-2193
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baensch-ak



Joined: 13 Jan 2008
Posts: 34
City/Region: Prineville
State or Province: OR
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: HARMONY
Photos: G. S. Lollipop
PostPosted: Sat Jun 23, 2012 10:31 am    Post subject: Reply with quote

H, Matt,

Thank you for your reply. I am happy with the way the boat/motor performs on the Sound and even at modest altitudes like the Prineville Reservoir or Lake Billy Chinook here in Central Oregon. My concern was primarily for Lake Powell, which is, as far as I have been able to find out, at just under 3,700 feet elevation, another 2,000 feet higher than our lakes here. I have also heard from a Lake Powell visitor that he could not get C-Dory 25 on plane until he got a prop with a lower pitch.

Is there a formula that can be used to estimate power loss versus altitude and relates that to pitch reduction to maintain RPM/power? There ought to be one I would think, but I have looked all over the i-net and not found one. My guess is that reducing pitch from 15" to 13" would work for me, but it is only a guess.

Thank you, Al
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colbysmith



Joined: 02 Oct 2011
Posts: 602
City/Region: Madison area
State or Province: WI
C-Dory Year: 2007
C-Dory Model: 22 Cruiser
Vessel Name: Midnight Flyer
Photos: Midnight Flyer
PostPosted: Thu Jun 28, 2012 11:14 pm    Post subject: Reply with quote

I've got the C-22 crusier with a Mercury 115 EFI 4-stroke. The current prop is a stainless 13 3/4 x 13. I would like to switch to an aluminum prop. I think the current one seems to be running ok, but wondering what others with this boat and engine are using for props. Thanks. Colby
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thataway



Joined: 02 Nov 2003
Posts: 11508
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Thisaway
Photos: Thataway
PostPosted: Fri Jun 29, 2012 2:30 am    Post subject: Reply with quote

On our first C Dory (90 hp Evinrude 2 stroke)--we used a 17" seal level, 15" powell, and 13" at the highest elevation. Dropping at least 2" is advisable.

Mercury puts out a chart showing HP loss at altitude. About 10% at 3500 feet and 20% at 7,000 feet. So a 90 would be close to 81 at 3000, and about 72 at 3500 feet. A lot depends on loading, type of prop, cupping etc. So far our Honda 90 carbonated runs well enough at Powell, that we are sticking with the 15" on the 2006 boat. If I was to pick up a second prop, I would go with 13".

On the 25, we finally ended up with an 11" pitch (down from 15) on Powell. But that boat was under powered with the Honda 130 and also loaded. The engine was badly lugging with the 15" prop.
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