propeller dimensions

blgl2785 · Post by **blgl2785** » Fri Jan 26, 2007 2:30 pm

Hello, I'm currently restoring a 1977 convertible with the original Cummins 555 engines. Could anybody help me with the propeller dimensions/pitch ? Thanks, alan

IRGuy · Post by **IRGuy** » Fri Jan 26, 2007 2:54 pm

Alan... You have to know the HP and trans gear ratio before you can make a decision on props.. there is a great prop calculator on the Boatdiesel forum, which you can access if you are a member. If not, consider joining for the annual fee of $25.00.. it is probably the best money you can spend as far as diesel engine education is concerned. What props are there now, and what WOT engine speed can you obtain, and what is the engine rating RPM? Frank B - IRGuy@aol.com "Phoenix" 1983 FBC Wilmington, NC

Post by **dougl33** » Fri Jan 26, 2007 5:21 pm

Well, I have a Bertram spec sheet from 1984 back when the triple nickel was still an option on the 33's (rated @ 270hp) and 35's (rated @ 215hp). The gears and props for the 33 were: MG502 2:1 spinning a 22x26 inch prop on an 1-3/8" shaft The gears and props for the 35 were: MG506 1.97:1 spinning a 22x24 inch prop on an 1-3/8" shaft That being said, Frank B is correct. Its important to know what hp and gear ratio you have. At the very least, the gears should be labelled. Hope this helps. Regards, Doug L. 1986 33 Bertram FBC Queen Elizabeth Marblehead, MA [img]http://www.bertram33.com/photogallery/p ... sabeth.jpg[/img]

Capt. Ed · Post by **Capt. Ed** » Fri Jan 26, 2007 5:46 pm

Here is the link to Boat Diesel. Welcome aboard Alan. http://boatdiesel.com/

blgl2785 · Post by **blgl2785** » Wed Jan 31, 2007 10:47 am

Thanks for the information everyone! I'll obtain the required alan and get back to you. -alan