Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-12-2004, 14:17   #16
Registered User
 
Tord's Avatar

Join Date: Dec 2004
Location: Gothenburg, Sweden
Posts: 1
Propellor efficiency

The fixed pitch propellor is most efficient at one speed, its design speed and design rpm. At all other speeds it is less effcient, but can still be more effcient than a reversible, as reversing
a propellor will always be inefficient, unless the
propellor is designed to be as efficient forward
as backwards, which in turn means the blades have no twist, thus are much less effcient than
a good fixed pitch propellor, when going forward.

The solution is of course to have vertical propellor shafts and 90 degree gearboxes,
to make your inboard act like a small outboard
without a reverse :-)!
__________________

__________________
Tord
www.aricraft.com/tord/tord.html
(note that only cellular phone #
is correct - since I wrote the text
I've moved and married :-)!
Tord is offline   Reply With Quote
Old 21-12-2004, 15:17   #17
Registered User
 
BC Mike's Avatar

Join Date: Jun 2003
Location: Gabriola BC
Boat: Viking 33 Tanzer 8.5m Tanzer 22
Posts: 1,034
Images: 5
Prop.

I will make my final decision at the Vancouver boat show in early February, a geared folding prop will likely be the best choice and the best price. I do not worry much about reverse, the folding Martec has always been sufficient. I intend to motor with the pointy end forward except the odd time exiting the marina.
Michael
__________________

__________________
BC Mike is offline   Reply With Quote
Old 22-02-2005, 20:00   #18
Registered User

Join Date: Feb 2005
Location: North Vancouver
Posts: 2
propellor

I realize that there haven't been any activity on this thread for a long time but I'm interested in getting feedback on a feathering prop.

I have a CS36 sailboat. Fin Keel, 15500 lbs, Westerbeke 30. Currently have a fixed 3-blade prop and am considering a Kiwi feathering prop.

If anyone is still monitoring this thread, your thoughts would be appreciated.
__________________
Jim Morris is offline   Reply With Quote
Old 23-02-2005, 06:44   #19
Registered User
 
Jon D's Avatar

Join Date: Sep 2004
Location: Ft. Lauderdale, FL currently CLODs [cruisers living on dirt]
Posts: 423
Images: 11
prop

Not familiar with the kiwi but have had maxprops on two different boats. You will love the difference.

On a 36' 11,000 lb racer had a two blade on the current 47' 30,000 lb have a 3 blade.

Of note is the three blade ones generally have lower harmonics when motoring. The PYI folks are very good at helping size and spec the correct prop.
__________________
Jon
S/Y Sirius
Moody 47
Jon D is offline   Reply With Quote
Old 23-02-2005, 08:26   #20
Registered User
 
BC Mike's Avatar

Join Date: Jun 2003
Location: Gabriola BC
Boat: Viking 33 Tanzer 8.5m Tanzer 22
Posts: 1,034
Images: 5
Propellor

I just ordered a two bladed geared folding prop from the same dealer as the Kiwi feathering prop. Norm Ross the owner is one of the nicest guys anywhere, I have known him for about twenty years. Phone is 604 506-2032 Fax 430-0309
email norm@WestByNorth.com We have a CS36 in our puddle but I do not know what prop he is using. The Beneteau 34 has a Kiwi feathering prop and it made a huge difference, it used to be a Beneslow. I think you will find the pricing from Norm attractive especially on the feathering prop. I have heard about props sticking in position but I do not know the whole story with respect to how clean the prop was. The Zebra mussells in the East are causing problems I have heard. I am trying to get the Tanzer 8.5 down to the big puddle later this year.
BC Mike
__________________
BC Mike is offline   Reply With Quote
Old 26-01-2007, 11:47   #21
Armchair Bucketeer
 
David_Old_Jersey's Avatar

Join Date: Oct 2006
Posts: 10,013
Images: 4
Anyone got any reports on the Kiwi Prop?

I am 99% certain to buy one (both from what I have read elsewhere and on price).........just that I thought with a load of Kiwi's here.............
David_Old_Jersey is offline   Reply With Quote
Old 26-01-2007, 11:52   #22
Registered User

Join Date: Sep 2005
Posts: 228
There is very positive report on Kiwi prop in February issue of Practical Sailor.
__________________
BambooSailor is offline   Reply With Quote
Old 26-01-2007, 12:06   #23
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
I have never seen one yet. But I have heard nothing but positive comments about them. Never one single neagative, apart from a prospective buyer that had a negative comment about the "plastic" blade.
It's not actually "plastic", but a very strong composite and I think if there were issues with them, we would have heard a great deal of negative comments buy now.
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 26-01-2007, 13:33   #24
Armchair Bucketeer
 
David_Old_Jersey's Avatar

Join Date: Oct 2006
Posts: 10,013
Images: 4
Quote:
think if there were issues with them, we would have heard a great deal of negative comments buy now.
I was thinking much the same............just thought with this having started in Kiwiland that folk down there may have been using the product longer than elsewhere.
David_Old_Jersey is offline   Reply With Quote
Old 26-01-2007, 18:17   #25
cruiser

Join Date: Mar 2004
Posts: 1,167
Try fairing the deadwood ahead of the prop to a point.
Brent
__________________
Brent Swain is offline   Reply With Quote
Old 27-01-2007, 05:07   #26
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,571
Images: 240
Maybe the problem lies in the Coriolis force being reversed on the nether-side ...
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.