"terry" skrev i en meddelelse
ps.com...
Thinking of changing to a 3 blade prop?
Westerly 26 foot about 7000 pounds when in the water and occupied.
Engine is a Volvo MD1B (9 HP) with maximum speed of 1800 RPM via a 1:1
forward reverse gear.
Reason for change is we need a new prop.
Also advice some years back from a couple who took a similar size boat
cruising the Caribbean and claimed that the 3 blade was much better,
while experiencing no increased drag under sail!
Would welcome any comments/advice.
Terry


A few years ago, we changed from a two blade Gori propeller to a three
blades Volvo propeller on a 30' Albin Ballad '73 model - priginally
calle a half tonner; roughly same weight as your boat; and almost same
old Volvo Penta (MD 6A) as well ...

Resulted in significant improvements in speed, maneuvrability, "braking
ability" i.e.: Much better control of the boat when motoring -
especially during harbour maneuvres ... Consumption of diesel did not
change as far as we could see... We could not feel or measure any
increase in drag when sailing - that is: Insignificant - not
noticeable - reduction in speed under sail ... and we did not experience
any change in vibrations ...

Should have done it many years ago ...

Recently the old Volvo was changed to a VP 2003 ... That is another big
step "forward": The consumption of diesel did not increase very much and
the "oil consumption" decresed a lot ... and the smoke and smell
disappeared ... and the sound and vibrations from the engine literally
also disappeared ... And the advantages from the three bladed propeller
became even more significant. Should also have done this uprade many
years ago!

--
Flemming Torp
was: Ballad D-251
now: X-342/DEN-61 ...