Original Props?

[kboette1]

Hey guys,
I have the original manual etc, but no where does it say what the original props were. I have an F36 with twin crusader 454's 350hp. Also what are you guys using now? 3-blade, 4-blade etc. I'm just curious. I have a buddy with a 33 Bertram and I can see propwash moving water as soon as he flicks it into gear. and I sometimes have to give gas to get the movement I need. Thanks in advance.

[prowlersfish]

Your buddy could have diesels or be idling faster

Many F36s are running 20x20 or 20x21 3 blade ( what it came with ) . If your going 4 blade you'll have to drop pitch (19 ?)

I am running 22x22 with a 1.5 to 1 gear but I am running diesels

[LandVF36]

As usual, Paul is spot on. Our 1973 Sportfish has GM 454s with 1.91:1 gears turning a set of 3 blade 20 x 20 props. (I have a set of 20 x 19 4 blade props that I've never tired). In the spring, when the bottom is perfectly clean, and I have not loaded her up with tons of gear, water, and fuel, at 4000 RPM the GPS shows 30 MPH. She's 40 year old, so I don't make a habit of running that fast and have not tried it in the past 3-4 years. Most of the time, a fast cruise for me is at about 3400 RPM and depending on gear and people it runs about 20-24 MPH. Most of the time, I just puts arond at about 1100-1500 RPM.

[kboette1]

When I cleaned up the boat this spring for paint etc I forgot (we are new to the boat) to write down the prop size. It's either 18 x 19 our 19 x 18. Either way it looks like w we might be undersized. My buddy with the Bertram has the same engines as I do. What is the harm in undersized props other than lack of speed?

[prowlersfish]

What harm is under size props ? None . What is the gear ratio? as it could have been changed .

[gettaway]

interesting thread and it brings to mind a policy we have adopted at work, which is to photograph everything. It is easy to transcribe numbers wrong or in the incorrect place, numbers such as VIN's, serial numbers , tire size, HP Family and Serial numbers, and once you write it down, you have to keep track of the piece of paper... you can always go back and find a photo and see the numbers ..( smart phones are great for this!)

When I hauled our boat at purchase, I photographed just about everything in which I could get a decent shot

[kboette1]

I did the same thing, except never got a close up of the prop. I'm so bummed about it. I'm planning to do a little diving in a month or so but I am also curious as to what everybody else is running. They seemed a little slow to respond. I'll get the gear ratio when I go down on Friday. Thanks guys!

[larryeddington]

Notice prop nuts big one, little one then Cotter key.

[gettaway]

Notice prop nuts big one, little one then Cotter key.

and...

boats a 1984 and the props are still there !

[prowlersfish]

Notice prop nuts big one, little one then Cotter key.

and...

boats a 1984 and the props are still there !

And they are on wrong

[larryeddington]

All that said they do have the final stopper, DA COTTERPIN!

[gettaway]

yes !

[kboette1]

Fyi if this helps... Big nut, then small, then cotter pin.... The right way... Lol it's amazing where that discussion shows up!

[prowlersfish]

Fyi if this helps... Big nut, then small, then cotter pin.... The right way... Lol it's amazing where that discussion shows up!

Small nut then big nut is the correct way

Heres a thread and poll we just did on this ,


http://www.trojanboats.net/wforum/viewt ... f=1&t=8374

[kboette1]

I finally have the information on the transmissions... I think they are 1.88:1. The guy 2 boats over from me has a 1988 F36 just line mine with 1.91:1. He is running 20x20 props. Anyone have any 20x20's for sale?? 1 3/8" shaft