John, I think you have that backwards. Usually, you get more speed and less
vibration with a 3 blade prop. The trade off is more drag under sail. Because
a 3 blade puts more load on the engine, it has to have less pitch than a 2
blade. With a clean prop and bottom, you should be able to get 2800 to 3200
rpm at full throttle while under way. Less than that, you are over propped
(too much pitch) and not getting full potential of the engine. Over that, you
are under propped and again not getting full potential.
Don, #6293, M-18, Niceville, FL
[EMAIL PROTECTED] wrote:
I posted this several days ago and not sure it got out. Have not
received responses.
---------
List
I am considering changing the prop on Escapade.
I currently have a three blade prop on the boat - stamped on the prop,
"MI/Fed, MP/TP 12 RH 10". I have no qualms about this prop except I would like
that extra 1/2 knot (as I have been told) with a two blade prop. The PO left a
two blade prop in the locker, stamped on this prop is "Sailer Michigan, 12 RH
12". Based on its appearance this prop was probably used by a previous owner
before switching to the three blade.
Question. What are the pros and cons on using these props? Are they the
correct sizes for my engine? What alternative props should I consider? Not
sure I would like a feathering or folding prop. Could become fouled (and
expensive). I seem to remember Dr. Judy has a different looking two blade
(thought I saved the item but can not find it).
While under sail, how do you make sure the prop stops in the vertical
position, in line with the cutlass bearing support? Wouldn't this the optimum
position for less resistance and more speed?
Any thoughts, suggestions, advice, dialog, etc.
John Jennings
s/v Escapade
83 C-27, # 5267
Standard/Dinette
I/B Diesel, 5411
Middle River, MD
John Jennings
s/v Escapade ~~~ /) ~~~
83 C-27, 5267 ~~~ ~~~
Standard/Dinette
I/B Diesel, 5411
Middle River, MD
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
