Elica per Ericson 38.200 [Propeller for...]

Saverio

Member II
Buongiorno a tutti voi, vorrei cambiare elica su Ericson 38. 200. Mettere una tre pale oppure un'abbatibile, ripiegabile, 20200125_110956.jpgqualcuno ha fatto questo? Dite passo elica?
 

ChrisG

Junior Member
Folding props are getting popular, I still have the standard 2-blade myself. I would like a folding prop myself if for nothing else than to stop the shaft from spinning all the time while sailing.
 

Geoff W.

Makes Up For It With Enthusiasm
Blogs Author
Google translate gives me:

Hello to all of you, I would like to change propeller on Ericson 38. 200. Put a three-blade or a foldable one, has anyone done this? You say propeller pitch?
I'm excited about a new Maxprop 3-blade feathering prop I'm going to go back into the water with. It's 15" diameter and I'm going in with 20 degrees of pitch. The new Easy designs let you change the pitch in the water by replacement of a couple bolts, so if 20 degrees doesn't work, I'll try something else.
 

Christian Williams

E381 - Los Angeles
Moderator
Blogs Author
Chris, most of us put the transmission in reverse gear to stop the prop from spinning under sail. Although it is apparently true that a stopped prop is more drag than a spinning one.
 

Keith Parcells

Sustaining Member
Chris, most of us put the transmission in reverse gear to stop the prop from spinning under sail. Although it is apparently true that a stopped prop is more drag than a spinning one.
Christian,

I distinctly recall reading an argument that concluded that there was more drag to a freewheeling prop, not less. The reasoning was that freewheeling effectively gave a surface area equal to the entire circle being spun by the prop, but not so with a locked version. So I set out to find it. I didn’t find that, but these two compelling and data driven reports support your view.....less drag from freewheeling. One test done by Maine Sail.


 

Keith Parcells

Sustaining Member
Here is one report which may have been a source for the opposite conclusion. It was apparently published by a guy who was selling shaft locks. Just a bit of conflict of interest there!

 

nquigley

Member III
Chris, most of us put the transmission in reverse gear to stop the prop from spinning under sail. Although it is apparently true that a stopped prop is more drag than a spinning one.
Does any part of that practice (set in reverse) have to do with minimizing wear in the gearbox? I'd rather have more drag and less gearbox wear if that's the trade-off. Does the manual recommend putting it in reverse?
 

Loren Beach

O34 - Portland, OR
Senior Moderator
Blogs Author
Does any part of that practice (set in reverse) have to do with minimizing wear in the gearbox? I'd rather have more drag and less gearbox wear if that's the trade-off. Does the manual recommend putting it in reverse?
For the Hurth trans, yes it did.
 

nquigley

Member III
Thanks - that what I thought (don't have the manual with me right now)
I have a 2-blade prop. It's located too far aft of the keel for there to be a drag benefit from locking it vertically. But, it's quite close to the rudder - I wonder if there's better flow over the rudder in one orientation or the other. Probably minimal difference in any kind of a seaway.
 

Kenneth K

Sustaining Member
Blogs Author
From the Hurth HBW-50 manual (first page):
"CAUTION: DO NOT LEAVE GEAR IN FORWARD WHEN SAILING. GEAR MUST BE IN NEUTRAL FOR FREE WHEELING OR SHIFTED INTO REVERSE TO LOCK PROPELLER WHEN SAILING."

From the Ericson 32-3 Manual:
"To prevent excess wear on the transmission, shaft and strut bearing, and also to reduce drag for more efficient sailing, be sure to place the transmission in reverse after the engine has been shut down for sailing."

"NOTE: LEAVING THE TRANSMISSION IN THE "FORWARD" POSITION WHILE SAILING AFTER SHUTTING DOWN THE ENGINE WILL "GLAZE" THE TRANSMISSION PLATES AND CAUSE SLIPPAGE WHEN THE ENGINE IS RUNNING IN GEAR."



Also, an interesting note elsewhere in the Hurth manual:

"When running the engine to charge batteries in neutral, engage transmission for 1 or 2 minutes every 2 or 3 hours to lubricate all internal parts."
 

ChrisG

Junior Member
Thanks I didn't know I could lock the shaft by putting it in reverse, I'll be trying that this weekend :)

Please let us know how the folding three-blade works out.
 
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