engine revs and pitch and prop size....

[LeonF]

Further to the previous postings re the above. I managed to get about 2800 revs from my Volvo 2010 in flat water yesterday. May have overdone the increase in prop from 12 inch two blader, pitch 10, to a 3 blade 13:11. Will have to live with it for while, but just wonder if at some time the pocket allows, what would be better.. a smaller prop with the 11 pitch, or the same size prop, 13, but reducing the pitch ? Shall never return to the two blader.. what is the trade off between size and pitch??

 

[SwedishLass]

Try punching numbers into this spreadsheet, it seems to have come up with the right numbers for me...

http://www.alberg30.org/maintenance/MechanicalPropulsion/Propeller/propcalc.xls
Grahame, Fairey Atalanta A65 Joann

 

[LeonF]

thanks John.. was going to try it, but can't open an excel file... do you have it in Acrobat pdf formate ??

 

[brianrunyard]

As it's an interactive spreadsheet it won't work in pdf.
Try Propcalc