Hobie Cat Forums

It is currently Fri Oct 24, 2014 6:53 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Better Ama Rentention
PostPosted: Sun Mar 17, 2013 5:44 pm 
Offline
Site Rank - Old Salt

Joined: Tue Jul 19, 2005 6:29 pm
Posts: 2092
Location: High Point, NC
I've read a bit about the Island Ama bungees proving to possibly be problematic under certain extreme conditions. I know my Amas will pop up and down on high wind, rough water days. Some have reported using double bungee set ups to help in this regard. Others have reported failures. I think there is a better way to attach the Amas to the Akas.

Considering that Aka arms extend all the way down through the Amas, the bungees can be dispensed with entirely. If you remove the plastic end cap on the Aka end, and epoxy a nylon lock nut in place inside the opening, then reinstall the cap into the Aka, you can use a bolt/screw to hold a washer (I used a nylon washer trimmed to mimic the teardrop shape of the Ama underside opening) against the bottom of the Ama, which effectively pins the Ama to the Aka under any and all conditions. No slop, no drop, no loosening and provided you did a good job reinstalling the Aka end cap, a virtually fool-proof attachment.

In fact, if Hobie had the desire, they could mold in a little recess on the Ama bottom to accommodate a specialty fastener there, which I believe would be vastly superior to the bungee system currently in play.

I'm taking mine out this weekend and will report back with photos.


Top
 Profile  
 
PostPosted: Sun Mar 17, 2013 6:06 pm 
Offline
Site Rank - Old Salt

Joined: Fri Jan 05, 2007 9:21 pm
Posts: 2238
Location: Maui, Hawaii
I've thought of it too. Sounds good, but it has no give. So if the ama/aka connection gets overstressed, what's the next piece in line to give or to break?

I do look forward to your tests.

_________________
Image
http://KayakingBob.com - - - - - Hobie Island Sailing since 2006 - - - - - 2011 & 2012 Hobie AIs and a 2012 TI


Top
 Profile  
 
PostPosted: Sun Mar 17, 2013 6:12 pm 
Offline
Site Rank - Old Salt

Joined: Tue Jul 19, 2005 6:29 pm
Posts: 2092
Location: High Point, NC
The real pressure on the Ama is "up," not down. The collar already prohibits the Ama from moving up on the Aka. The bungee is only there to keep the Ama in place when its own weight would otherwise cause it to drop off the Aka. There is no real stress in that direction, so a positive attachment there shouldn't cause any undue stress or problems. All the force lies with the Ama pushing up against the Aka. That's why a bungee, under most conditions, is sufficient to keep the Ama on the Aka ends. There isn't anything other than the weight of the Amas themselves, trying to pull the Amas off the Akas. The real pressure or force, is upwards, not downwards.


Top
 Profile  
 
PostPosted: Sun Mar 17, 2013 6:28 pm 
Offline
Site Rank - Old Salt

Joined: Sat Nov 05, 2011 1:58 am
Posts: 1528
Location: Forster, NSW, Australia
Sounds like a great idea Tom, and there is nothing to stop you also leaving the bungees on for belt-n-braces redundancy.

Also, looking at this subject as covered in the Watertribe thread nearby, this method has no negative effect on folding the amas in like doubling the bungee strength etc. This would seem to be almost a compulsory mod for EC competitors, or indeed anyone tackling serious weather. It really is such a simple answer. Top job mate!

Show me the photos! :mrgreen:

PS. of course this is not such a good idea for those who need to dismantle their Island for transport...

_________________
Tony Stott
2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


Last edited by tonystott on Sun Mar 17, 2013 6:35 pm, edited 1 time in total.

Top
 Profile  
 
PostPosted: Sun Mar 17, 2013 6:33 pm 
Offline
Site Rank - Old Salt

Joined: Tue Jul 19, 2005 6:29 pm
Posts: 2092
Location: High Point, NC
Actually, there are fasteners that can be employed that would allow you to drop the Amas off just as quickly as you can with a bungee.

Assuming this is an area that could be improved, Hobie could do it very simply with a system that is just as quick yet far more reliable than the use of bungees.


Top
 Profile  
 
PostPosted: Sun Mar 17, 2013 7:45 pm 
Offline
Site Rank - Old Salt

Joined: Wed Oct 19, 2011 6:02 am
Posts: 325
Location: Cape Coral, FL
Image

Still flexible enough to fold, had it this way for a year now.

_________________
2011 Golden Papaya TI with a 250 square foot spinnaker!
also a more manageable 100 square foot spinny...
&
the TI3 rear ama mod


Top
 Profile  
 
PostPosted: Thu Mar 21, 2013 10:08 am 
Offline
Site Rank - Captain

Joined: Mon Sep 24, 2012 6:12 pm
Posts: 41
Tom, you should have titled this “ No More Freaking Loud Rattly Amas!” Which is my biggest complaint with the setup. I am putting this on the list of mods. Oh Lord, finally a quiet sail! Seriously the things are noisy. I nominate Tom to the book of world records with the best Ama retention device ever! :D

_________________
2012 Mango Tandem Island


Top
 Profile  
 
 Post subject: Re: Better Ama Retention
PostPosted: Thu Mar 21, 2013 10:32 am 
Offline
Site Rank - Old Salt

Joined: Tue Jul 19, 2005 6:29 pm
Posts: 2092
Location: High Point, NC
It's going to get better in about 30 minutes. Check back for the latest.


Top
 Profile  
 
PostPosted: Thu Mar 21, 2013 10:51 am 
Offline
Site Rank - Old Salt

Joined: Tue Jul 19, 2005 6:29 pm
Posts: 2092
Location: High Point, NC
I'll refine this a bit more as I go along, but am stopping here for now while I look at a lower retention system as I had originally planned.

http://www.youtube.com/watch?v=C6f5GUUSFg0

By the way, if you're worried about losing the hitch pin, attach it to the retention clip via a small hole and a plastic wire tie.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 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