Prop replacement

Rodman · Post by **Rodman** » Wed Mar 10, 2010 9:06 pm

I saw this prop on ebay. Do you guys think this one will work for me?

http://cgi.ebay.com/ebaymotors/Brass-Bo ... iesQ5fGear

foofer b · Post by **foofer b** » Wed Mar 10, 2010 9:26 pm

Price is right for sure. The pitting on the hub worries me. The prop looks like it has 14LH 9 originally stamped on it. with 10 stamped over it. That should do nicely for you. If it revs a little too high you can probably have another inch of pitch put into it.
Is your boat a LH engine/tranny? Did trojan make anything else in the F26
? Anyone out there know?

foofer b · Post by **foofer b** » Wed Mar 10, 2010 9:28 pm

Silly me, I revisited your prop pics so disregard my LH question.

Rodman · Post by **Rodman** » Wed Mar 10, 2010 9:45 pm

foofer b wrote:Silly me, I revisited your prop pics so disregard my LH question.

LOL

prowlersfish · Post by **prowlersfish** » Wed Mar 10, 2010 10:06 pm

If you can get it cheap go for it

rossjo · Post by **rossjo** » Wed Mar 10, 2010 10:38 pm

What shaft dia?

What Dia/Pitch do you have today?
Cupped?
Engine model/Torque/HP?
Boat Weight?

Rodman · Post by **Rodman** » Wed Mar 10, 2010 11:26 pm

F26 1 inch shaft.

rossjo · Post by **rossjo** » Wed Mar 10, 2010 11:44 pm

318 Chrysler?

Torque/HP?

Boat Weight?

26'?

Rodman · Post by **Rodman** » Wed Mar 10, 2010 11:47 pm

318 Chrysler? No 351 Ford W

Torque/HP? 240hp

Boat Weight? Unsure

26'?[/quote] F26 express 26ft

rossjo · Post by **rossjo** » Thu Mar 11, 2010 12:09 am

Gear ratio?

Need weight - approx 8,000lbs or what?

Rodman · Post by **Rodman** » Thu Mar 11, 2010 12:24 am

rossjo wrote:Gear ratio?

Need weight - approx 8,000lbs or what?

V drive 1.1 5400lbs

rossjo · Post by **rossjo** » Thu Mar 11, 2010 12:49 am

Per BoatDiesel.com (sign up for $25/year):

> Average Planing Hull
> 5400 lb
> 24' Waterline Length
> 1 engine
> 240 SAE HP
> 4,500 RPM
> 2,500 Cruising RPM
> V-Drive
> 1.1:1
> 3-Blade, Cupped
> 14" Diameter

RESULTS
MAX PERFORMANCE
Available Power: 232.8 SAE hp ( 173.6 kW) @ 4500 RPM
Max Speed: 32.2 kts
Fuel: 14 US Gall/Hr (typical)
CRUISING PERFORMANCE
Cruising Power: 48 SAE hp ( 35.5 kW) @ 2500 RPM
Cruising Speed: 14.6 kts
Fuel: 3 US Gall/Hr (typical)
RECOMMENDED PROPELLER
Diameter: 12.8 in. Pitch: 11.5 in.
Blades: 3 Cupped: Yes
Transmission Ratio Acceptable
PROPELLER BASED ON INPUT DIAMETER
Diameter: 14.0
Pitch: 10.0
Blades: 3

So, a 13x11.5 3-blade cupped is recommended, but a 14" diameters would be a 10" pitch.

I think you're engine is running weak - new points? Timing right? Good distributor? Carb opening? 4-BBL Carb? Motorcraft Carb?

foofer b · Post by **foofer b** » Thu Mar 11, 2010 7:55 am

Rodman, you shpuld probably add 1000 lb to your estimated weight.

foofer b · Post by **foofer b** » Thu Mar 11, 2010 7:59 am

Rossjo, will you please run my numbers up the flagpole and tell me what prop I need?

F26---6500lb clean bottom
Crusader 454 about 350 hp
Velvet drive 1:1 trans

rossjo · Post by **rossjo** » Thu Mar 11, 2010 8:23 am

Gentlemen,

BoatDiesel.com is a paid service (just $25/year), and you really should join to get these numbers. As a subscriber, you're allowed to run 25 of these calculations per year. Paul (2010 Trojan Boater of the Year candidate) is also a member.

Foofer - what is the max dia prop you can run on that F26?

My personal Prop Calculator software says you need a 14x11 or 14x12 3-blade for that.

It says 13x11 3-blade for Rodman's boat, which correlates with BoatDiesel.com's recommended calculation of 12.8 Dia X 11.5 Pitch. Telling it Rdoman wanted to use a 14" dia, returned a 10" pitch to compensate.