Reply
 
Thread Tools Search this Thread
 
Old 31 May 2005, 08:25   #1
Member
 
Country: UK - England
Town: Surbiton,Gt London
Length: 5m +
Join Date: Nov 2003
Posts: 437
Prop guard

I have been looking back at some old posts on prop guards not very positive. As the kids have now got some toys to tow this summer the wife thinks we should look at installing one. Has anyone been useing one or have any experance with them they could pass on.
__________________

__________________
Neal
Remember It is only possible to live happy-ever-after on a day-to-day basis
Neal is offline   Reply With Quote
Old 31 May 2005, 08:39   #2
Member
 
Richard B's Avatar
 
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
I guess that your search threw up a potential performance loss...

Probably worth looking at the very well finished stainless steel guards that Thundercats use - obviously they want to minimise their performance loss!
__________________

Richard B is offline   Reply With Quote
Old 31 May 2005, 08:41   #3
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
The Royal Navy diving club has a couple of Mariner 40s with them on. They turned a perfectly good planning inflatable boat into a 6 knot disaster. Huge loss in performance and they cost a fortune from Barrus (doesn't everything)

Understand your concern with the kids but in 20 years of diving I haven't seen a problem yet. A smokey 2 stroke tends to persuade individuals to stay away from the back of the boat before they get anywhere near the prop.

Run the engine out of the water and show the kids the prop moving round.

Pete
__________________
.
Ribnet is best viewed on a computer of some sort
Pete7 is offline   Reply With Quote
Old 31 May 2005, 09:03   #4
Member
 
Country: UK - England
Town: Kent
Boat name: Cygnet
Make: Humber
Length: 5m +
Engine: Suzuki 70hp 4* outbo
Join Date: Apr 2004
Posts: 205
We had 2 made up from stainless steel for our dive boats, they both run slower than before, and then one hit an underwater obstruction on the Thames while training new members. The result was the prop guard rapped itself round the prop breaking the gear casing, causing the inflatable to drift down the Thames in the fast running water.
Then a couple of years a go we got one of those plastic oneís that they advertise as improving performance. At low speed it did seem to be more directional but we didnít see any improvement at higher speeds. Unfortunately we suffered another gearbox casing fail allowing salt water to get in & seize the gearbox.
Needless to say we havenít fitted them since.
__________________
Swanley Sub-Aqua Club
Jackwabbit is offline   Reply With Quote
Old 01 June 2005, 12:59   #5
Member
 
Country: UK - England
Town: Surbiton,Gt London
Length: 5m +
Join Date: Nov 2003
Posts: 437
Thanks all, looks like no real improvements in this matket. Think more training for the kids better option for now.
__________________
Neal
Remember It is only possible to live happy-ever-after on a day-to-day basis
Neal is offline   Reply With Quote
Old 01 June 2005, 14:33   #6
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
We had a prop guard of the tunnel/shulz nozzle type fitted, it was about £100 I think. It was smashed to pieces on rocks with only minor damage to the prop.

It did knock a lot of performance off. As as been previously discussed jets offer the ultimate in safety, a number of options exist for retro fitting a jet lower unit, however, one must bear in mind that a jet will lose 1/3 of its hp the Yam 80 is in fact the 115 or 100hp prop unit esteemed fora memebers will no doubt be able to recall this better than myself.

They also perform very differently in some sea states. If the benefits/features outwieghed the risks then possibly the RNLI would use jets they do not and do have rather a good record in rescue.
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 02 June 2005, 12:01   #7
Member
 
Country: USA
Town: San Diego.California
Boat name: Bayshots
Make: XS-550
Length: 5m +
Engine: Suzuki DF90
Join Date: May 2004
Posts: 876
RingProps

Hi Neal,
was looking at the same issue ,as my kids also love their donuts !
I also read negative feedback on guards and then came across this product.

http://www.westmarine.com/webapp/wcs...productId=1501

Supposedly the ring eliminates the "filleting effect" of conventional props and would seem to help in seaweed (big Kelp beds here).
Would seem to be a good compromise and claims"better performance'(of course)

Anyone had experience of these ??

cheers Dal
__________________
limeydal is offline   Reply With Quote
Old 02 June 2005, 19:59   #8
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by limeydal
Hi Neal,
was looking at the same issue ,as my kids also love their donuts !
I also read negative feedback on guards and then came across this product.

http://www.westmarine.com/webapp/wcs...productId=1501

Supposedly the ring eliminates the "filleting effect" of conventional props and would seem to help in seaweed (big Kelp beds here).
Would seem to be a good compromise and claims"better performance'(of course)

Anyone had experience of these ??

cheers Dal
Yes I have seen these as well - looks a pretty good idea but wonder how well iit will work???
__________________
codprawn is offline   Reply With Quote
Old 03 June 2005, 00:40   #9
Member
 
Country: USA
Town: San Diego.California
Boat name: Bayshots
Make: XS-550
Length: 5m +
Engine: Suzuki DF90
Join Date: May 2004
Posts: 876
Havn't seen them advertised for larger engines though and wonder if the ring just adds to the potential balance problems.
Seems you could get away with a small ding in a standard prop, but a twist or nick in the ring and the added mass on the outer edge could cause exagerated effects.
cheers Dal
__________________
limeydal is offline   Reply With Quote
Old 03 June 2005, 03:13   #10
Member
 
Country: UK - England
Town: Surbiton,Gt London
Length: 5m +
Join Date: Nov 2003
Posts: 437
Dal I am going to RIBEX over the weekend will report back if I find further information.
__________________

__________________
Neal
Remember It is only possible to live happy-ever-after on a day-to-day basis
Neal is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 -5. The time now is 16:09.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.