Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rating: Thread Rating: 3 votes, 4.67 average. Display Modes
Old 07-12-2007, 08:52   #151
Registered User

Join Date: Feb 2007
Posts: 107
One thing everyone should keep in mind that with a deisel motor it is critically important that the motor will make at least 90 percent of its rated RPM with the props installed under normal conditions. If your engine will not do that you will do damage long term and void most engine warranties. If your engine is rated at 3000 rpm you must be able to attain 2700 minimum with your boat at its normal cruising weight as an example.
__________________

__________________
sailvi767 is offline   Reply With Quote
Old 07-12-2007, 16:07   #152
Registered User

Join Date: Nov 2007
Location: Maryland
Boat: Tartan 37C "Windgeist"
Posts: 108
Quote:
Originally Posted by fstbttms View Post
Goddam plastic screws on Autoprop zincs! Jeezus, what a poorly designed POS! I hope I never see another one (but I know I will.)

Why don't you tell us how you really feel

I am not sure what plastic screws your talking about on the zinc. There is one stainless nut that holds the zinc on which is over the zerk fitting???
__________________

__________________
Windgeist is offline   Reply With Quote
Old 07-12-2007, 22:18   #153
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Quote:
Originally Posted by Windgeist View Post
Why don't you tell us how you really feel

I am not sure what plastic screws your talking about on the zinc. There is one stainless nut that holds the zinc on which is over the zerk fitting???
Not on the Autoprop. The manufacturer provides 3 really sh*tty plastic machine screws (called "Anode Retaining Screws") to hold a pyramid-shaped anode to the end of the body of the prop. Worthless POS- see below:



There is an aftermarket adapter that will allow you to install a standard U.S.-style prop zinc. The fact that such a product even exisits is indicative of the crappy design of the Autoprop:



Autoprop Adaptor page
__________________
fstbttms is offline   Reply With Quote
Old 08-12-2007, 00:39   #154
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 would have thought it a better idea to use the same material the prop is made from. Plastic, hmmmm.
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 08-12-2007, 06:38   #155
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,054
Wheels-
I'm guessing that matching the exact alloy the prop is made from, could either be difficult or expensive--since screws aren't offered "stock" in many yellow alloys. OTOH with the great big gob of anode sitting there, any "reasonable" screw might be so thoroughly protected that it would suffice, including common stainless or galvanized varieties. Galvanize might actually have a dual advantage, being zinc jacketed, and having a rougher surface finish which helps it "stay stuck" better than stainless. (I only learned recently that stainless can sometimes be "too smooth" and require thread lock--where galvanized will simply stick from the higher friction.)

But I've got nothing against a properly chosen plastic. DuPont and GE and Phillips all have what they call "engineered plastic resins" and some of them are quote impressive--and expensive. Many of them compete with and exceed specs for metal parts, the only question is "Which plastic and was it properly chosen?"
__________________
hellosailor is offline   Reply With Quote
Old 08-12-2007, 12:33   #156
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 was thinking and refering to the prop manufacturers fitting the screws. They could easily machine scres made from the same material. Not particularly hard.
Galv coating doesn't work. The very thin surface of the Galv errodes away at the same rate as the rest of the Zinc. Bing so thin, it is not long before it is plain steel. Been there, done that, said Duh!
I don't thinK I would use SST when it is the only SST in a Bronze environment. The anode may protect, but the way I see it is, you only want to protect what you have to. Every additional Reactive combination you create, only serves to make the anode eat away faster. You want to have the anode last as long as you can, (in the restraints of correct voltage protection)
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 08-12-2007, 15:05   #157
Registered User

Join Date: Nov 2007
Location: Maryland
Boat: Tartan 37C "Windgeist"
Posts: 108
I am a idiot!

Quote:
Originally Posted by fstbttms View Post
Not on the Autoprop. The manufacturer provides 3 really sh*tty plastic machine screws (called "Anode Retaining Screws") to hold a pyramid-shaped anode to the end of the body of the prop. Worthless POS-
Yup...I am a idiot! We do not have a Auto Prop, its a Auto Stream like this one. Explains what I was thinking...



Google Image Result for http://www.westbynorth.com/images/_autostream.jpg
__________________
Windgeist is offline   Reply With Quote
Old 08-12-2007, 16:05   #158
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Quote:
Originally Posted by Windgeist View Post
Yup...I am a idiot!
There are so many different manufacturers of props and so many different brand names (in some cases, several marketed by a single manufacturer) that confusion is bound to happen. I can't keep 'em straight either.
__________________
fstbttms is offline   Reply With Quote
Old 08-12-2007, 17:10   #159
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,054
"They could easily machine scres made from the same material. Not particularly hard."
Wheels, you're right. And Westerbleake could easily put the hoses and belts on AFTER they paint the whole engine.

That doesn't mean it is going to happen. Some accountant probably said "Well, you'd need a lathe, and a parts bin, and that could take up thirty square feet of floor space, and then you'd need an operator, and rod stock...And it could cost you seventy grand a year. So if you use these here cheap screws and just order 'em by the thousand, you can save enough money to send your kids to college. Or buy that new BMW!"

Gotta get with the program, Wheels. [sigh]
__________________
hellosailor is offline   Reply With Quote
Old 08-12-2007, 17:43   #160
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Here's my other big gripe about Autoprop; look at the illustration. The only thing holding the prop nut on (and therefore the prop) is a tiny little set-screw. In a perfect world, the set-screw seats on one of the flat faces on the hex-head of the prop nut. But in reality this is sometimes not the case. In reality, the set-screw sometimes seats on the round, barrel body of the nut. In which case the installer must determine where this location will be on the nut and file or grind a flat spot on the body of the nut for the set-screw to seat on. Hopefully when the nut is re-installed, the flat spot on the now modified prop nut will be directly under the set-screw. This, of course, is a pretty much a crap shoot with no fail-safe way to tell if you hit the mark properly or not.





This scenario happens frequently enough that it is addressed by the manufacturer in the installation instructions.
__________________
fstbttms is offline   Reply With Quote
Old 08-12-2007, 20:05   #161
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 reckon that could be easily solved. By the manufacturer that is. I reckon a small backing plate that has a the hex hole to suit the nut could be easily fitted between the hub and the anode. This could have a series of bolt holes all the way around that would then mean you could tension the bronze nut till it lined up with a hole set and in go the three machine screws...that would be bronze also by the way.
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 11-12-2007, 06:11   #162
Registered User
 
Eleven's Avatar

Join Date: Sep 2007
Location: Southampton UK
Boat: Jaguar 22 mono called Arfur.
Posts: 1,220
Images: 3
Thanks for the comments on Broadblue with Brunton's.
I was worried about the props not being up to it but it seems the installed power may be a problem.
Mahe 36's take note that two ten HP's may not /will not drag you off a lee shore. Put it on your shakedown list. We had sea room, thanks to chance and the lord Neptune (who has more control of things than we do).
__________________
Ex Prout 31 Sailor, Now it's a 22ft Jaguar called 'Arfur' here in sunny Southampton, UK.
A few places left in Quayside Marina and Kemps Marina.
Eleven is offline   Reply With Quote
Old 11-12-2007, 09:42   #163
Registered User
 
Yachts66's Avatar

Join Date: Sep 2005
Location: In the Jungle, on an Island near the beach
Boat: Roberts 45 Mariah's Child
Posts: 654
Images: 15

WOW this has been a great thread....but I find myself just about as confused now as I was in the beginning! My refit will begin shortly and re-power and I'm still not sure which prop to go with. I was pretty high on Autoprops until this thread, but the Maxprop seems to have its own set of problems! What's a fella to do?

Regards,

TJ
__________________
Yachts66 is offline   Reply With Quote
Old 11-12-2007, 10:07   #164
Registered User

Join Date: Jan 2005
Location: Fiji
Boat: Westsail - CC - 42
Posts: 339
Prop Choice

When I was thinking I would have to return the Autoprop, my next choice was the Luke Feathing prop. Also if I had less than a 50 hp engine there is a prop with plastic blades that is getting a rather high following.

Fair Winds
__________________
Fair Winds
-Dave
http://www.svelysium.net/index.html
dkall is offline   Reply With Quote
Old 11-12-2007, 10:17   #165
Registered User
 
RaptorDance's Avatar

Join Date: May 2006
Location: On Board - Currently - Heading back to SF Bay from Mexico.
Boat: Valiant 50 - Raptor Dance
Posts: 196
Images: 2
Send a message via Skype™ to RaptorDance
Yachts66 - it all boils down to where you're planning to go and what you're planning to do.

In spite of some of the negative opinions of Autoprops in this thread. We love ours. Most of the opinions expressed don't translate to actual experiences by the Autoprop owners we've met cruising.

The plastic zinc screws aren't a problem because they only hold on the zinc and you get new ones with every zinc. The flat back of the zinc makes fine electrical contact with the prop.

The set screw on the prop nut isn't a problem since the prop shaft and prop are keyed, the prop always goes back on in the same place. Also, I haven't heard of any one losing the prop because the nut backed off (unlike most fixed props that are held on by just two nuts in series). I've heard of folks losing regular props, Max Props and others, but not the Autoprop.

What has been a problem is folks losing a blade. In every case I've examined, that's traceable back to a lack of maintenance, or improper rebuilding of the prop. Each blade is held on by two nuts, one big one that does the work and a second locking star nut that's reverse threaded. You then must bend over a tab on the star nut to lock with the big nut underneath.

The folks who lost blades didn't think they locked the two nuts together or just plain didn't maintain their prop (you're supposed to grease it at every haul out).

The other problems reported with a loss of thrust when pounding into head seas is a problem with all props. I notice little difference between our Autoprop and other props. Note, it would be better in such cases to have a great big fixed prop with large blade area, any other sailing prop will likely exhibit similar results to what we've seen with our Autoprop.

One other performance killer is growth on the prop. The Autoprop uses hydrodynamics to pitch properly. A bunch of barnacles on the prop can really mess things up. We anchored in Zihuatanejo last year our prop got so dirty we could only do 3 knots instead of our usual 7.5. We had to pull into Isla Grande anchorage to clean our bottom (it got real bad in only a week! Zihua bay is very nutrient rich - which is why I wouldn't dive on it before we left).

So keep it clean, maintain it and you should be happy with an Autoprop, like most of the other owners I know.

Note - I have no interest at all in any way with Autoprop, other than as an owner.

I do have a backup fixed prop, with nuts and a puller just in case. I figure I have that no matter what prop I normally use... However, I've so far, never needed it!

Regards,
Bill
__________________

__________________
SV Raptor Dance - Valiant 50 #107
Bill Finkelstein & Mary Mack
http://raptordance.com
RaptorDance 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Autoprop Propeller wunscot Classifieds Archive 7 16-01-2010 13:16
Autoprop - Used Value Conch Cruzer Monohull Sailboats 4 30-07-2009 18:11
Used Autoprop For Sale Conch Cruzer Classifieds Archive 0 27-05-2009 05:15
H5 AutoProp Hub markpj23 Classifieds Archive 0 08-03-2009 13:45



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:33.


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.