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Old 05-03-2014, 14:31   #1
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Join Date: Oct 2011
Location: Portland, OR
Boat: Ericson 38
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'Eye' vs 'T' toggle turnbuckle differences?

I'm wondering what would drive the decision to use one of either 'Eye' or 'T' toggles? For example the TFB or the ETFB toggles from Hayn - Forged Bronze Turnbuckles by Hayn Marine. They both seem to offer two degrees of freedom, is one better suited for certain applications? If not... any thoughts on why both still exist?

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Old 05-03-2014, 15:15   #2
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Boat: csy 44 tall rig.
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Re: 'Eye' vs 'T' toggle turnbuckle differences?

I prefer the eye toggle, T Toggles are more prone to cracks, the eye toggle got better articulation , so far so good we replace a bunch of this T toggles for eye toggles each season, run away from T Toggles from ACMO brand ...
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Old 05-03-2014, 16:13   #3
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Re: 'Eye' vs 'T' toggle turnbuckle differences?

Geometrically they should articulate the same, but in practice there is more friction with the T setup, because strain on the wrapped sheetmetal outer element tends to squeeze it onto the fixed pin of the T, and because a wrapped element is not as geometrically perfect as a machined hole.

It doesn't help that the pin in the T setup is more exposed to salt aggregating, and there is twice the projected area under load.

According to classical friction theory, this extra area cancels out and does not give rise to extra resistance to articulation, due to lower contact pressure

But in practice, with rough surfaces or particulates present, the theory no longer holds.

The other factor is the severe stress concentration arising from the 'armpits' under the T setup's crossbar. Added to that is the severe coldworking implied in producing them, which sets stainless up to fail.

So it makes sense to me that, as neilpryde claims, the T toggles would crack more readily than the eye toggles.
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