Propeller specification 12 Meter
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- Dutchman59
- Registered user
- Posts: 12
- Joined: Sun Dec 13, 2020 1:18 pm
Propeller specification 12 Meter
Hello, thanks for letting me joint the group. I recently bought a 1988 Trojan 12 Meter International Flybridge with twin 6-71 @ 450 HP.
The Boat was sitting for a couple of years due to the owner passing away as a result I have no history on anything. We surveyed the boat and it did well for the age. One of the issues I have is with the RPM. Currently, I can not get much over 2000 RPM (=24 knots). I am cruising the boat @ 1800 RPM what gives me 20 to 21 knots.
The Tachs are new, and I am aware that the governors could be limiting. The boat came with 2 sets of propellers (24 x 26 with a cup installed) and a spare set 26 x26.
I am wondering if anybody in the group would know the proper factory spec for this set up.
Thanks in advance
The Boat was sitting for a couple of years due to the owner passing away as a result I have no history on anything. We surveyed the boat and it did well for the age. One of the issues I have is with the RPM. Currently, I can not get much over 2000 RPM (=24 knots). I am cruising the boat @ 1800 RPM what gives me 20 to 21 knots.
The Tachs are new, and I am aware that the governors could be limiting. The boat came with 2 sets of propellers (24 x 26 with a cup installed) and a spare set 26 x26.
I am wondering if anybody in the group would know the proper factory spec for this set up.
Thanks in advance
- prowlersfish
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- Joined: Sat Nov 05, 2005 6:56 pm
- Location: Lower Chesapeake Bay ,Va
Re: Propeller specification 12 Meter
Is the bottom clean ? I would get a photo tach and check the rpm first. Do you check the no load rpm in neutral ? Under load you should turn 2500-2550 .
It should be in your manual . If you don't have one and no one post the size contact Bob Beacon marine he can tell you . Also You can get the manual from them .
Got the info 26x27 3 blade From the factory
Sweet boat
It should be in your manual . If you don't have one and no one post the size contact Bob Beacon marine he can tell you . Also You can get the manual from them .
Got the info 26x27 3 blade From the factory
Sweet boat
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
- prowlersfish
- 2024 Gold Support
- Posts: 12664
- Joined: Sat Nov 05, 2005 6:56 pm
- Location: Lower Chesapeake Bay ,Va
Re: Propeller specification 12 Meter
No load wide open rpm should be about 2650 . Engine should be warmed up . And tach checked
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
- Dutchman59
- Registered user
- Posts: 12
- Joined: Sun Dec 13, 2020 1:18 pm
Re: Propeller specification 12 Meter
Thanks for the info, will look for a manual
- prowlersfish
- 2024 Gold Support
- Posts: 12664
- Joined: Sat Nov 05, 2005 6:56 pm
- Location: Lower Chesapeake Bay ,Va
Re: Propeller specification 12 Meter
Since you are slightly under the factory size , (26x27 3 blade ) Are you 3 blade ? I would check the Tachs . you can get a photo tach cheap on line .
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
- Dutchman59
- Registered user
- Posts: 12
- Joined: Sun Dec 13, 2020 1:18 pm
Re: Propeller specification 12 Meter
Yes have 3 blade propellers, Tachometers are new and calibrated proper.
- prowlersfish
- 2024 Gold Support
- Posts: 12664
- Joined: Sat Nov 05, 2005 6:56 pm
- Location: Lower Chesapeake Bay ,Va
Re: Propeller specification 12 Meter
Has the the no load wide open rpm been checked ? This will tell you how the gov is .
Some boats need to be a few inches under spec on the props , almost all need to be a inch under as a min.
Some boats need to be a few inches under spec on the props , almost all need to be a inch under as a min.
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat
- Dutchman59
- Registered user
- Posts: 12
- Joined: Sun Dec 13, 2020 1:18 pm
Re: Propeller specification 12 Meter
No testing right now, boat on the hard for the winter
Re: Propeller specification 12 Meter
Wow, awesome boat! It looks brand new...