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What Prop for Mercury 115 Command Thrust on 22 Cruiser

 
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primative



Joined: 16 Mar 2004
Posts: 161
City/Region: Portland
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: Primative
Photos: Primative
PostPosted: Mon Oct 18, 2021 11:57 pm    Post subject: What Prop for Mercury 115 Command Thrust on 22 Cruiser Reply with quote

I now have a Mercury 115 Command Thrust motor on order for my 22 Cruiser. Iím wondering what is a good prop size to use?

Thanks,
Tom

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jennykatz



Joined: 15 Dec 2003
Posts: 1665
City/Region: naples
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: Little Treasurer
Photos: Jennykatz
PostPosted: Tue Oct 19, 2021 6:01 pm    Post subject: Prop Reply with quote

We have a cc23 venture which weighs at least 700-800 lb more we have the Mercury 115 CT we use a SS 14 3/4 by 17 pitch it takes it up to 5800 rpm. And about 33-35 mph My old engine was a Yamaha 115 with a 13 1/2 by 15 pitch You will be pleasantly surprised how well this engine (Merce)will work around the marina /dock etc
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retired 8/08 from UAL, still working pt tm
Duck c-22 cruiser sold 6/23/08
06 Venture Cruiser with merc115CT
00 cd16 cruiser honda 40 sold 3/12
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colbysmith



Joined: 02 Oct 2011
Posts: 3543
City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
PostPosted: Tue Oct 19, 2021 8:37 pm    Post subject: Reply with quote

Midnight Flyer, my past 22, had the Mercury 115 4-stroke EFI. I ran an aluminum 4 bladed prop, 13 1/4 x 13. I believe the 3 blade aluminum was a 14 x 13, but I'd have to go find some old records to double check. Colby
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primative



Joined: 16 Mar 2004
Posts: 161
City/Region: Portland
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: Primative
Photos: Primative
PostPosted: Wed Oct 20, 2021 4:22 pm    Post subject: Reply with quote

Thanks everyone for your responses,

Jennykatz the 700-800 LB more for your Venture might be like my 22 with 5 people onboard if 150 lbs each = 750lbs, or other equivalent of gear for heavier loads on my boat. Sounds like the SS 4 blade works best for your motor and boat. Interesting, the different size props between your 115CT and the Yamaha 115. When you said your Merc works well around the marina and dock, I take it that it has better control for docking and close quarter situations ó that sounds nice.
Did someone recommend the prop you use, or was it trial and error to get the right size?
What brand did you go with for your prop?

Colbysmith, was the former Merc 115 you had on your 22 a Command Thrust model? Just checking to compare apples to apples.

Interesting that one C-dory and Mercury dealer recommended I start with a pitch of either 19 or 21 inches (3blade). He said you probably want to be around 5200 to 5500 rpm for a C-Dory.
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colbysmith



Joined: 02 Oct 2011
Posts: 3543
City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
PostPosted: Wed Oct 20, 2021 8:07 pm    Post subject: Reply with quote

I don't think my Merc 115 was a command thrust. As for RPM's, I think it best you go with what the outboard manufacturer suggests for WOT when you test out your prop.
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DSigmond



Joined: 09 Apr 2016
Posts: 9
City/Region: Bainbridge Island
State or Province: WA
PostPosted: Mon Nov 15, 2021 8:30 pm    Post subject: Can a prop kill a motor? Reply with quote

I've had an '07, 22 Cruiser for 3 years -- Great Boat! C Brats great as well. But the Yamaha 115 died with 500hrs. Always easy to start, smooth idle, ok power, no oil use, regular 100hr maintenance, for 3 years anyway. Then the engine saver engaged and the oil light came on. Dry dipstick! Filled and changed oil ... She starts and idles well, still no oil slick, but ate two quarts in 1/2 hour at speed. Compression: 50, 75, 100, 150. Oil out the exhaustk two plugs with burned off tips. Not worth repair.
Ouch.
She came with a 13x19 aluminum three blade, and was never to get past 5,200rpm. Mechanic thought maybe a lugging engine wore it out, but really didn't know. When it starts, they can go to hell in no time.
Thoughts?
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DSigmond



Joined: 09 Apr 2016
Posts: 9
City/Region: Bainbridge Island
State or Province: WA
PostPosted: Mon Nov 15, 2021 8:31 pm    Post subject: Can a prop kill a motor? Reply with quote

I've had an '07, 22 Cruiser for 3 years -- Great Boat! C Brats great as well. But the Yamaha 115 died with 500hrs. Always easy to start, smooth idle, ok power, no oil use, regular 100hr maintenance, for 3 years anyway. Then the engine saver engaged and the oil light came on. Dry dipstick! Filled and changed oil ... She starts and idles well, still no oil slick, but ate two quarts in 1/2 hour at speed. Compression: 50, 75, 100, 150. Oil out the exhaustk two plugs with burned off tips. Not worth repair.
Ouch.
She came with a 13x19 aluminum three blade, and was never to get past 5,200rpm. Mechanic thought maybe a lugging engine wore it out, but really didn't know. When it starts, they can go to hell in no time.
Thoughts?
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jennykatz



Joined: 15 Dec 2003
Posts: 1665
City/Region: naples
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: Little Treasurer
Photos: Jennykatz
PostPosted: Thu Nov 18, 2021 4:46 pm    Post subject: Cc venture Reply with quote

I would buy a SS 3 blade 14. 3/4 or 15 in diameter by 17 pitch should give you 6000 rpm at full speed as you load it down your rpm and speed will come down
Our cc23
4000 rpm =20 mph
4500 rpm =25 mph
5400 -5800 rpm = 34 mph

Have fun the venture sweet spot is 4200 rpm at 22 mph
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primative



Joined: 16 Mar 2004
Posts: 161
City/Region: Portland
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: Primative
Photos: Primative
PostPosted: Thu Nov 18, 2021 6:39 pm    Post subject: Reply with quote

Thanks for your prop data, Thumbs Up
My motor just arrived at the dealer. Took about 3-4 weeks, I consider myself lucky.
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jennykatz



Joined: 15 Dec 2003
Posts: 1665
City/Region: naples
State or Province: FL
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: Little Treasurer
Photos: Jennykatz
PostPosted: Sat Nov 20, 2021 8:15 am    Post subject: Prop Reply with quote

You will love the engine
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