F36 tri-cabin speed
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Re: F36 tri-cabin speed
I have the same 20x17 but 270 crusaders so with less power the best speed ever was 22 mph I think with a tail wind and rpms maxed at 3500. I agree with paul, I am sure I will need less pitch and or less diameter.
I am really wanting to know what speeds our tri-cabs get at WOT and 4400 pms.
Once I finish this book I may know a reasonable answer to achieving it.
I am really wanting to know what speeds our tri-cabs get at WOT and 4400 pms.
Once I finish this book I may know a reasonable answer to achieving it.
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- prowlersfish
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Re: F36 tri-cabin speed
WayWeGo wrote:Pretty sure -- I have the Prop Scan sheets from Black dog on them.prowlersfish wrote:Unless you both have the same engines and gears any comparing is useless . Big difference between a 440 turning 4000 and a 350 turning 4400 Waywego your boat calls for 20x21 or 20x20 are you sure of the prop size ?
Seem small but if they where 4 blade w/some cup I could see it
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
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Re: F36 tri-cabin speed
3-blade with no cup, which seems strange to me as well. The engines are not over-revving at full throttle and everything else seems to be OK.prowlersfish wrote:Seem small but if they where 4 blade w/some cup I could see itWayWeGo wrote:Pretty sure -- I have the Prop Scan sheets from Black dog on them.prowlersfish wrote:Unless you both have the same engines and gears any comparing is useless . Big difference between a 440 turning 4000 and a 350 turning 4400 Waywego your boat calls for 20x21 or 20x20 are you sure of the prop size ?
Maybe the boat is heavy with too much junk aboard? Have never had it on a travel lift to see what their scale says.
1975 F-36 Convertible
Twin Chrysler 440's
Twin Chrysler 440's
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Re: F36 tri-cabin speed
Way we go, What speed does she go at WOT and 4k rpm?
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- WayWeGo
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Re: F36 tri-cabin speed
I never paid that much attention, but about 24-25 mph by gps, as best I recall. Once the fuel flow sensors go in, I am going to test and record data...
1975 F-36 Convertible
Twin Chrysler 440's
Twin Chrysler 440's
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Re: F36 tri-cabin speed
thanks, Mine is way too slow.
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- WayWeGo
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Re: F36 tri-cabin speed
I agree with prowlersfish that your situation is quite different from ours. Your boat has a greater displacement and smaller engines, making direct comparisons difficult.larryeddington wrote:thanks, Mine is way too slow.
Maybe some of the folks with tri-cabins can be of more help...
1975 F-36 Convertible
Twin Chrysler 440's
Twin Chrysler 440's
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Re: F36 tri-cabin speed
larryeddington wrote:I have the same 20x17 but 270 crusaders so with less power the best speed ever was 22 mph I think with a tail wind and rpms maxed at 3500. I agree with paul, I am sure I will need less pitch and or less diameter.
I am really wanting to know what speeds our tri-cabs get at WOT and 4400 pms.
Once I finish this book I may know a reasonable answer to achieving it.
Larry are your gears 2 to 1 ?
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
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Re: F36 tri-cabin speed
Paul I think they are 1.91 to one but will check next time at lake, it is on the tranny tag
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- prowlersfish
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Re: F36 tri-cabin speed
Larry , running some numbers a few inches less pitch is called for . But I would think about going 1" , reason being is as you go up in rpm the engine will be able you pull harder and give you even more rpm . Like to se a HP graph
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
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Re: F36 tri-cabin speed
I am going to do the calcs per this book which according it can be pretty accurate. I agree less pitch for sure, however these props are spendy so cannot just try one after the other. The bigger diameter the proper the more efficient if you have not over pitched it. I am pretty sure when it is said and done it will be 15 or even 14. But not presupposing. Will run the calcs at weight, draft, L of water line and width at water line and HP at 4400 RPM.
Understand I am not trying to make this waterborne boat a speedboat but trying to get her max when desired.
Which I had 671s but not going to happen.
Understand I am not trying to make this waterborne boat a speedboat but trying to get her max when desired.
Which I had 671s but not going to happen.
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- prowlersfish
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- Joined: Sat Nov 05, 2005 6:56 pm
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Re: F36 tri-cabin speed
I would re-pitch what you have now . Remember the results are only as good as what you put it .larryeddington wrote:I am going to do the calcs per this book which according it can be pretty accurate. I agree less pitch for sure, however these props are spendy so cannot just try one after the other. The bigger diameter the proper the more efficient if you have not over pitched it. I am pretty sure when it is said and done it will be 15 or even 14. But not presupposing. Will run the calcs at weight, draft, L of water line and width at water line and HP at 4400 RPM.
Understand I am not trying to make this waterborne boat a speedboat but trying to get her max when desired.
Which I had 671s but not going to happen.
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
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- Joined: Mon Sep 28, 2009 5:08 pm
- Location: Canton, TX Boat on TEXOMA
Re: F36 tri-cabin speed
Can only go up or down 2 inches pitch. See what the cslc says.
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
- prowlersfish
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Re: F36 tri-cabin speed
If you want to go with 4 blades Mitch just sold his F36 and is selling his spare set https://minneapolis.craigslist.org/dak/ ... 29869.htmlWayWeGo wrote:Pretty sure -- I have the Prop Scan sheets from Black dog on them.prowlersfish wrote:Unless you both have the same engines and gears any comparing is useless . Big difference between a 440 turning 4000 and a 350 turning 4400 Waywego your boat calls for 20x21 or 20x20 are you sure of the prop size ?
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
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- 2024 Gold Support
- Posts: 1871
- Joined: Mon Sep 28, 2009 5:08 pm
- Location: Canton, TX Boat on TEXOMA
Re: F36 tri-cabin speed
Paul I do not think the 4 blades would help as they are 20x19 if I take 2 inches pitch out I am at 20x17 with 4 blades. Me thinks would be worse than now.
Larry Eddington
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink
1984 F-36 Tri Cabin "The Phoenix II"
1978 F-28 "The Phoenix"
Fish Master 2350 Bay Boat
9.5' Dink