Hobie Cat Forums

It is currently Mon Sep 22, 2014 8:20 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 11 posts ] 
Author Message
 Post subject: Turbo fin problem
PostPosted: Mon Mar 16, 2009 3:29 pm 
Offline
Site Rank - Old Salt

Joined: Fri Nov 21, 2008 3:39 am
Posts: 863
Location: Bairnsdale, Victoria Australia
I may have a problem developing with my turbo fins after only two outings. Mickey is on his sabatical so I took off solo today down our Mitchell River. Though the wind was 10 to 15 knots, it fluked down the river in a most haphazard fashion and I got to pedal for about 3 hours total with not a great deal of help from the wind at times.
Anyway had a great day but when I returned to the ramp and was packing up I noticed one of the mast ends is starting to tear through the rubber fin at its extremity. I was careful not to hit anything so am having trouble explaining it.
The turbos only went on a week back and Mickey and I were very careful to ensure the masts were screwed in all the way home.

AxelH already stated this in another thread:
That sounds exactly like the problem I mentioned in this thread.
For me it looked like a constructional problem or an issue based on the material used, therefore I brought the fins back to my dealer and used the standard fins (the black ones). Of cause pedaling now is a little bit slower and I enjoyed using the turbo fins, but I also don't wanted to waste my money more than reasonable.

I have repeated this as it got buried in another thread.
Have other had this problem or is mine just a bad batch and is there a simple cure?.... Pirate


Top
 Profile  
 
 Post subject:
PostPosted: Mon Mar 16, 2009 5:17 pm 
Offline
Site Rank - Captain

Joined: Sat Oct 27, 2007 5:47 pm
Posts: 84
Location: NW FLorida Panhandle
Mine developed a tear but only after hitting several logs and bending the mast. After straightening the mast it still used to frequently slip and poke through the hole that tore in the fin In an effort to keep from buying new fins I tried tightening the fin to the mast with the brass knurled nut at the top of the in. They don't have as much flex now but I haven't had an issue with it after that and haven't seen any performance issues with them being that tight. (I've put at least 200 miles of pedaling on them since.)

My situation is a little different because I hit something but, to make a long story short- maybe too much flex or slack in the fin makes it susceptible to tearing. If it's all ready torn, I'd try cranking them down on the mast before you go out and buy new ones.

It worked for mine.

Mike


Top
 Profile  
 
 Post subject:
PostPosted: Tue Mar 17, 2009 12:51 pm 
Offline
Site Rank - Captain

Joined: Tue Jun 03, 2008 7:23 pm
Posts: 60
Location: Ft Lauderdale FL
After a year of abuse in the everglades and the oyster bars of Chokoloskee I had the fins tear on the leading edge. It sometimes happens when the tips of the fins are just kissing the bottom and you can hardly tell while you are pedaling. Anyway I ordered a new pair and while waiting I remounted the old pair and covered the affected areas in a generous coating of plumbers good. Six months later they are still going strong and they are the fins I give to newbies when I take them out.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Mar 17, 2009 1:41 pm 
Offline
Site Rank - Old Salt

Joined: Fri Nov 21, 2008 3:39 am
Posts: 863
Location: Bairnsdale, Victoria Australia
quirkster wrote:
After a year of abuse in the everglades and the oyster bars of Chokoloskee I had the fins tear on the leading edge. It sometimes happens when the tips of the fins are just kissing the bottom and you can hardly tell while you are pedaling. Anyway I ordered a new pair and while waiting I remounted the old pair and covered the affected areas in a generous coating of plumbers good. Six months later they are still going strong and they are the fins I give to newbies when I take them out.


Thanks for that. Plumbers Good is??......Pirate


Top
 Profile  
 
 Post subject:
PostPosted: Tue Mar 17, 2009 4:11 pm 
Offline
Site Admin

Joined: Tue May 27, 2003 12:44 pm
Posts: 9025
Location: Oceanside, California
Tear-aid as shown in the catalog.

According to roadrunner this works.

http://www.hobiecat.com/community/viewtopic.php?t=11754

_________________
Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


Top
 Profile  
 
 Post subject: Fin Protector
PostPosted: Tue Mar 17, 2009 6:23 pm 
Offline
Site Rank - Old Salt

Joined: Fri Sep 19, 2008 4:07 pm
Posts: 400
Location: CLEARWATER, MN
I have some wide waterproof fibreglas tape. Would placing about
six inches on the leading edge of the fin help to protect from
'strike/mast punctures'? I have used it on paddle cracks as
a temporary fix and it never came loose.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Mar 17, 2009 11:32 pm 
Offline
Hobie Approved Guru

Joined: Sat Nov 12, 2005 10:46 pm
Posts: 2407
Location: Escondido
Pirate, sorry you're having a problem.

The fin can ride up and down the mast a small amount if if it has the room to do so. Presumably your wear is at the tip of the mast, not slightly further up the mast where it would be more indicative of striking something (here the fin frequently stretches first before any hole is made).

Check your mast tip and make sure there are no burrs chewing out your fins, especially from the screw slots. You might also flush your fins well and make sure everything is nice and clean inside.

Finally, a bit of silicon spray can help them rotate freely if appropriate.

If everything else looks good and this is just happening with one fin, I would suspect the possibility of a a thin spot from an air bubble in the molding process (haven't actually heard of it happening though). :?


Top
 Profile  
 
 Post subject:
PostPosted: Wed Mar 18, 2009 7:42 am 
Offline
Site Rank - Old Salt

Joined: Tue Jun 19, 2007 6:14 pm
Posts: 1886
Location: South Florida
Pirate,

On our recent "Attack of the rudders" camping trip, I ruined my ST Turbo fins. I think it was the way Quirkster suggested. As I headed into East Clubhouse to replace my rudder pin, there is a wide stretch of muck (Everglades cement) extending out from shore, before the water gets deep enough to use the fins. I'm afraid I was finning the muck on approach to shore w/o knowing it--maybe just an inch or 2 (25-50 cm). That may have been enough for each mast to break through at the tip.

I've hit oyster bars w/ only scratches and cuts. Unknowningly finning on a shallow bottom may spell disaster for Turbo fins.

I'll definitely be much more careful next time in shallow situations.

Keith

_________________
I sail: Biscayne Bay, Everglades to Cape Romano, Ft Desoto, Cedar Key

"Any intelligent fool can make things bigger and more complex ... It takes a touch of genius and a lot of courage to move in the opposite direction." A. Einstein


Top
 Profile  
 
 Post subject:
PostPosted: Wed Mar 18, 2009 3:52 pm 
Offline
Site Rank - Admiral

Joined: Thu May 25, 2006 5:17 pm
Posts: 203
Location: Ettalong Beach, Central Coast, Australia
I inspected my turbo fins yesterday, and one of them has a 6 mm split, right near the top (hull). This is very unlikely to have been caused by contact other than the fins hitting the hull on the stoke end.

Geoff.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Mar 18, 2009 4:55 pm 
Offline
Site Rank - Captain

Joined: Sat Feb 09, 2008 4:04 pm
Posts: 74
i used cable ties to fix up an old pair of st fins and they worked well for ages. thread through fin and around mast


Top
 Profile  
 
 Post subject: Re: Turbo fin problem
PostPosted: Fri Apr 17, 2009 2:55 pm 
Offline
Site Rank - Captain

Joined: Thu May 08, 2008 3:29 pm
Posts: 142
Location: Dublin, Ireland
I launch from an inlet surrounded by rocks full of barnacles. On occasion, if the swell is particularly difficult, it is possible to scuff one or two of the rocks. Normally, it's not a problem.

I had the ST Turbo fins only a few days and managed to hit one of the rocks tearing the side of both fins. Ordering a spare wasn't that easy and so I had to try to figure a fix. I managed to straighten the pins and then I carefully applied a series of masking and electrical tape. To my amazement, the fins have worked perfectly ever since and that was one year ago. Luckily, I have managed not to hit any other rocks.

_________________
Better to be a live donkey than a dead lion!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group