TI aka failures, amas collapsing, etc.

Yes, multiple Threads on the same issues makes info hard to find.

For instance, "deformed rudder line entry", is a new one to me, haven't checked it, nothing I can do anyway.

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Fair Skies, Max.

My wife and I have been out three times (Lake Winnipesaukee, NH) on our 2015 TI. We like it a lot.
We would like to install Bob Fusioneng's TI stiffener lines. We are in our 70s and do not want extra lines along the outside or through the cockpit. How about a 48" firm bungie or 1/4" nylon line from the bow padeye back to the forward aka at the same position as where the diagonal crossbrace is attached to the rear aka? This way we would have no extra lines running through or beside the cockpit.

Thoughts?
Rob

Another brand new 2015 AI Hullied in Queensland recently whilst being sailed in moderate winds and no waves the Shear Pin suddenly broke.
It took the middle-age occupant 20 minutes to right it again, they had not read about the issue previously so had not modified against this design fault.

I am afraid to use my new AI with out making these safety mods, I understand how to do Bob's anti-unplug line but still a bit confused about the anti--AKA-fold line. Is there a reason why a line cant be simply run from Bow padeye to outboard-front of forward AKA ?

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Fair Skies, Max.

It is all right there.

There is no reason you can't run a line from the bow back along somewhere on the ama. If it is a strong nylon line, you then have a rigid system which may suffer other damage in a collision of some sort. My keep-out lines are designed as shock absorber lines--they have a strong, flat bungee cord section and a long nylon line section. The bungee cord provides give in case of a collision so that the shear pin can break, but after that initial shock (shear pin breaks, bungee stretches), the keep-out line will prevent the ama/aka from folding. I have tested the "keep-out" aspect of these lines at 8 mph. You can see the test here:



Keith

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2015 AI 2, 2014 Tandem

"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

"Less is more" Anon

I think running from the bow padeye to the forward aka would work fine. However, the farther out on the aka that the attachment is, the better the mechanical advantage (i.e. less stretch on the line if the akas collapse). If you need to fold the amas frequently (I do as I dock frequently), you could modify the system I use http://www.hobiecat.com/forums/viewtopic.php?f=69&t=54733&hilit=cleated+ama+safety&start=0). It also allows you to tension the lines easily.

Good luck.

I have a 2015 TI, and I have the tramps. In reference to a rigid system, when I release the diagonal brace that is supported by the shear pin, the Aka/Ama/Tramp is still a rigid system in itself. With my TI on the trailer I just now extended the Ama, installed the Tramp, and released the diagonal brace. It appears that it would take a lot of force to collapse the Ama, to the point that it most likely would cause other damage in the case of a collision. I'm not so sure in my case since I always use my Tramps that I don't just replace the shear pin with a stainless steel one? Without doubt the combination of Tramps and shear pin support is far stronger than just a shear pin alone for support. We launch our TI at a boat ramp with the front seat passenger climbing onto the tramp from the front to enter the front seat, because of this keeper lines are in the way, so I prefer not to have them. I would like to hear what others have to say. I'm not sure if this makes a case for or against the use of Tramps?

The only issue that the tramps wouldn't prevent from a collapse would be if the front aka we're to slip out of the connecting joint and thus allow the whole ama to collapse while breaking the back brace bolt, thus turtle the Island.
The safety lines running to the amas are doing two things, not just one.
I had the front aka brace pull out on a rough breaking surf and collapse the ama thus turtle the AI, yes the brace bolt snapped also. Did not have the safety lines in place. I do now, plus I don't try going thru 10ft. surf anymore with an island, lol.

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Mark
Tandem Island- 2013
2 - Sports - 2014

I run my "keeper lines" from the aka mounting points just behind the mast (tied the lines around the mounting blocks below the aka center tube) out to the ama handles. This puts the lines behind the front akas and underneath the tramps or hakas, nicely out of the way. Also easy to fold the lines and tuck them into the mesh pockets on either side when done.

Bungey sounds good so does Seaworthy idea, thanks.

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Fair Skies, Max.

This makes sense, but that is easily fixed with safety lines that hold the aka's together and they wont ever need to be removed unless your removing the aka's

A Sprayskirt will keep the front aka from coming out and a simple leash for each side rear aka.

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Hobie Island Sailing since 2006

The real danger in replacing the nylon shear pin with a metal one is its location, midway along the aka. It therefore follows that in the event of collision on the end of the ama, force will be DOUBLED at the location of the shearpin. If the pin can't breask, the aka will...

Replacing the nylon shearpin with a steel one should only be done by owners who are confident that they do not expect to hit anything.

Your trampoline will do a great job in preventing instant collapse of the amas, and also having the standard nylon in place is a good backup. If you don't have tramps, adding keepout lines offer lots of benefits for little outlay

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Tony Stott
2012 Tandem Island "SIC EM" with Hobie spinnaker

"Deformed Rudder Line Entry" may be referring to the spectra lines cutting into the flange on the end of the plastic tubing where the lines enter the hull. I noticed this on my brand new boat while unpacking it. During shipment the rudder pin is removed and the rudder assembly is packed on top of the stern. On my boat this caused enough tension in the spectra lines for them to cut into and leave permanent grooves in the plastic flanges for L&R control but not UP&down. I never bothered to repair it since it doesn't affect the inside diameter of the tubing and probably has a trivial effect if any on water entry.

Chris

Tony Scott Wrote:


Good point, any movement no matter how little, puts force on the aka at the location of the shear pin or mid way on the aka. with that being said I will now stick with the nylon shear pin. The tramps in combination with the shear pin are enough, but I will also add safety lines port to starboard holding the aka, preventing them from slipping out of the connecting joint, much like the green rope I see on Chekika's video.

Thanks for the comments guys, this was very helpful.

Thanks to all!
I now have a 48" firm bungie from bow padeye to front aka at about same position as rear aka brace attaches to rear aka. It is not strong enough to pull amas forward with aka brace disconnected.

Rob