Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-01-2012, 18:42   #16
Registered User
 
avb3's Avatar

Cruisers Forum Supporter

Join Date: Jul 2010
Location: Florida/Alberta
Boat: Lippincott 30
Posts: 9,913
Images: 1
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by Nicholson58 View Post
Seaduction, If you really want that jointed shaft on the cheap, take an automobile transaxle half-shaft and modify for your use. We build dynamometers for drive trian subassemblies. A typical trans-axle has a universal (Cardan) joint on the outboard end and a CV joint on the inboard end. They are made to run in salt spray. A good machine shop can make adapters for you. The tech issue you need to address is that you will need a GOOD combination radial and thrust bearing to support the prop shaft designed to fit your vessel since this shaft can ONLY transmit torque and absolutely zero thrust.
Am I missing something?

The only thing the shaft can produce is torque, a rotational force. Only the propeller can produce thrust. As such, I don't understand your last sentence.
__________________

__________________
If your attitude resembles the south end of a bull heading north, it's time to turn around.
avb3 is offline   Reply With Quote
Old 24-01-2012, 18:50   #17
Registered User

Join Date: Jan 2010
Location: Narragansett Bay
Boat: Able 50
Posts: 3,058
Re: The couple across the dock from me invented something pretty cool...

You could get the same cresult by tying a bowline in the outer end of the mooring line and dropping it over the cleat as you pass. If the rope is soft and the loop collapses, tie the bowline through some plastic tube in order to hold the loop open.
__________________

__________________
savoir is offline   Reply With Quote
Old 24-01-2012, 18:53   #18
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by Seaduction View Post
I think the idea shows great "outside the box" thinking. I hope somebody comes up with the idea of "universal joints" for boat drive shafts just like automobiles have. That would take care of all the boatcrobatics involved with aligning the engine and shaft. I've rarely had to replace a U-joint in my vehicles. (hey, I'd like 1% of the profits here).
From seeing that connection on the first "real" boat I was on in the late 70s I always wondered the same thing.
__________________
Who knows what is next.
Therapy is offline   Reply With Quote
Old 24-01-2012, 19:08   #19
Registered User
 
cat man do's Avatar

Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
Images: 36
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by savoir View Post
You could get the same cresult by tying a bowline in the outer end of the mooring line and dropping it over the cleat as you pass. If the rope is soft and the loop collapses, tie the bowline through some plastic tube in order to hold the loop open.
Or if on a dedicated mooring line with sliced loop, why couldn't a piece of s/s or monel wire be pushed into the entire loop.?
Strong enough to hold the loop open, weak enough to straighten under load
__________________
"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising – It Is Possible on a Small Budget
cat man do is offline   Reply With Quote
Old 24-01-2012, 19:17   #20
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: The couple across the dock from me invented something pretty cool...

Aquadrive
Just one of the many...
__________________
DeepFrz is offline   Reply With Quote
Old 24-01-2012, 19:25   #21
Nearly an old salt
 
goboatingnow's Avatar

Cruisers Forum Supporter

Join Date: Jun 2009
Posts: 13,649
Images: 3
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by Seaduction View Post
I think the idea shows great "outside the box" thinking. I hope somebody comes up with the idea of "universal joints" for boat drive shafts just like automobiles have. That would take care of all the boatcrobatics involved with aligning the engine and shaft. I've rarely had to replace a U-joint in my vehicles. (hey, I'd like 1% of the profits here).
Halyard have had them for years ( aqua drives) CV joints for boats
__________________
Check out my new blog on smart boat technology, networking and gadgets for the connected sailor! - http://smartboats.tumblr.com
goboatingnow is offline   Reply With Quote
Old 24-01-2012, 19:29   #22
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by David M View Post
Clever idea, but all he has to do is to slow down and he would not need it.
I've been told the same thing about....

Oops.

Nevermind.
__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 24-01-2012, 19:29   #23
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Live aboard
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 3,466
Images: 83
Re: The couple across the dock from me invented something pretty cool...

That thing sort of reminds me of this game - can't remember the name. Something about some kind of toss. something to do with anatomy.
Attached Thumbnails
Click image for larger version

Name:	DSCF0233.jpg
Views:	133
Size:	441.1 KB
ID:	36421  
__________________
Nicholson58 is offline   Reply With Quote
Old 24-01-2012, 19:38   #24
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,576
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by Seaduction View Post
I think the idea shows great "outside the box" thinking. I hope somebody comes up with the idea of "universal joints" for boat drive shafts just like automobiles have. That would take care of all the boatcrobatics involved with aligning the engine and shaft. I've rarely had to replace a U-joint in my vehicles. (hey, I'd like 1% of the profits here).
But they have:



http://www.aquadrive.net/how-it-works.html
__________________
S/V Alchemy is offline   Reply With Quote
Old 24-01-2012, 19:42   #25
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,576
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by Ozbullwinkle View Post
Alchemy - I think it is a cool & simple solution for docks with cleats when one is on a high sided vessel , is shorthanded and especially when there is a crosswind blowing across the berth.
Yes, I was thinking that. Not for everyone, but for some, a useful tool. Like circlips pliers or a two-jointed rachet wrench adapter...you use 'em twice a year, but you REALLY need them when you do.
__________________
S/V Alchemy is offline   Reply With Quote
Old 24-01-2012, 19:59   #26
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,832
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by avb3 View Post
Am I missing something?

The only thing the shaft can produce is torque, a rotational force. Only the propeller can produce thrust. As such, I don't understand your last sentence.
Axle shafts transmit torque to the wheels.
The suspension takes all the sideways forces such as cornering etc.
The axle shafts have splines to absorb suspension movements.

On a boat, the torque from the engine is transmitted to the prop.
The prop's thrust is transmitted back up the shaft and in most installations, is actually PUSHING the engine and transmission forward which drags the boat along with it via the engine mounts.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 24-01-2012, 20:09   #27
Registered User
 
avb3's Avatar

Cruisers Forum Supporter

Join Date: Jul 2010
Location: Florida/Alberta
Boat: Lippincott 30
Posts: 9,913
Images: 1
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by senormechanico View Post
Axle shafts transmit torque to the wheels.
The suspension takes all the sideways forces such as cornering etc.
The axle shafts have splines to absorb suspension movements.

On a boat, the torque from the engine is transmitted to the prop.
The prop's thrust is transmitted back up the shaft and in most installations, is actually PUSHING the engine and transmission forward which drags the boat along with it via the engine mounts.
Gotcha, now why didn't I think of that! Duh!!!
__________________
If your attitude resembles the south end of a bull heading north, it's time to turn around.
avb3 is offline   Reply With Quote
Old 25-01-2012, 04:02   #28
Armchair Bucketeer
 
David_Old_Jersey's Avatar

Join Date: Oct 2006
Posts: 10,013
Images: 4
Re: The couple across the dock from me invented something pretty cool...

Nice idea .

Probably works quite well on own dock (with cleat in the right place), but not so sure about in other places......personally I would have gone for a simple loop (inside a piece of hosepipe) on a stick / tube....available soon at USD41 .
__________________
David_Old_Jersey is offline   Reply With Quote
Old 25-01-2012, 06:36   #29
Guest

Join Date: Nov 2010
Posts: 433
Re: The couple across the dock from me invented something pretty cool...

Quote:
Originally Posted by DeepFrz View Post
Aquadrive
Just one of the many...
DANG!! Too late again!
__________________
Noname is offline   Reply With Quote
Old 25-01-2012, 08:42   #30
Registered User
 
denverd0n's Avatar

Join Date: Jun 2008
Location: Tampa, FL
Posts: 3,953
Images: 6
Re: The couple across the dock from me invented something pretty cool...

Interesting idea, and kudos to them for being able to make and market this product.

Still, I have to agree with the person who said they wouldn't need it if they weren't coming into the dock way too fast (at least in that video).
__________________

__________________
denverd0n 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
Dock Walking sarafina Our Community 24 04-10-2011 09:07
Cairns to Perth Part 1 Bartlettsrise Sailor Logs & Cruising Plans 1 11-09-2011 00:38
Dock Lines on Avon 340 RIB ? twistedtree Auxiliary Equipment & Dinghy 6 03-08-2011 07:09



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:28.


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.