Tost Ring Failure

On Tuesday, June 6, 2017 at 7:29:55 AM UTC-4, Dan Daly wrote:
On Tuesday, June 6, 2017 at 6:54:52 AM UTC-4, Tango Eight wrote:
http://www.tost.de/PDF/Arbeitskatalog_engl.pdf

Page 19.

Welded rings are long obsolete (or possibly counterfeit).

The right rings to use are easily identified.

It's pretty important to be using the right rings.

best,
Evan / T8

The manual also says that the standard dimensions should be checked and they are available from the factory. Does anyone in ras-land have them?

Received a pdf by e-mail; thanks, Glen from Aboyne.

On Tuesday, June 6, 2017 at 6:54:52 AM UTC-4, Tango Eight wrote:
http://www.tost.de/PDF/Arbeitskatalog_engl.pdf

Page 19.

Welded rings are long obsolete (or possibly counterfeit).

The right rings to use are easily identified.

It's pretty important to be using the right rings.

best,
Evan / T8

That is true for the small ring! They are seamlessly rolled or forged but the large ring has to get through it somehow, so it starts its life as a piece or 'wire' which gets formed and its ends are then joined by electric resistance welding (look up 'chain making' on YouTube).
Today, I inspected all the large rings of the double ring pairs I have with our winch and all of them show the tell-tale signs of a weld opposite of the stamped name 'Tost'. At least a close visual did not show any cracks. Maybe a simple 'dye-pen test is in order.

Uli
'AS'

That is true for the small ring! They are seamlessly rolled or forged but the large ring has to get through it somehow, so it starts its life as a piece or 'wire' which gets formed and its ends are then joined by electric resistance welding (look up 'chain making' on YouTube).
Today, I inspected all the large rings of the double ring pairs I have with our winch and all of them show the tell-tale signs of a weld opposite of the stamped name 'Tost'. At least a close visual did not show any cracks. Maybe a simple 'dye-pen test is in order.

Uli
'AS'


I seem to remember having read that the rings are made that way without any form of welding now. I suppose you could get the exact method used if you agree to pay for the technical norm:

http://standards.globalspec.com/std/...7/din-ln-65091

It's cheaper than ordering from the original German institute: http://www.din.de/en/getting-involve...din21:84399512

On Monday, June 12, 2017 at 7:14:35 AM UTC-7, wrote:
That is true for the small ring! They are seamlessly rolled or forged but the large ring has to get through it somehow, so it starts its life as a piece or 'wire' which gets formed and its ends are then joined by electric resistance welding (look up 'chain making' on YouTube).
Today, I inspected all the large rings of the double ring pairs I have with our winch and all of them show the tell-tale signs of a weld opposite of the stamped name 'Tost'. At least a close visual did not show any cracks.. Maybe a simple 'dye-pen test is in order.

Uli
'AS'


I seem to remember having read that the rings are made that way without any form of welding now. I suppose you could get the exact method used if you agree to pay for the technical norm:

http://standards.globalspec.com/std/...7/din-ln-65091

It's cheaper than ordering from the original German institute: http://www..din.de/en/getting-involv...din21:84399512

Correct. Any connecting rings meeting Aeronautical Standard (LN) 65091 can't be welded.

Tost connecting rings pairs are made from steel fine cast. The small ring and large ring are casted into each other. This casting is an elaborate procedure.

Rings with welding seam are not from Tost and do not meet the Aeronautical Standard.

Sean Franke

On Monday, June 5, 2017 at 9:45:05 PM UTC-4, Jock Proudfoot wrote:
]
https://forum.sac.ca/download/file.php?id=254
https://forum.sac.ca/download/file.php?id=253

btw... these pics aren't publicly accessible.

T8

Information
Vous n’êtes pas autorisé(e) Ã* télécharger cette pièce jointe.

Would some kind soul who really knows please tell us whether genuine Tost rings are ever(a) welded or (b) oval? Sounds more like bits of chains such as for those safety chains on trailers to me. Hence their being called earlier Toast rings(sic)!!






On Monday, June 5, 2017 at 9:45:05 PM UTC-4, Jock Proudfoot wrote:
Larry Morrow posted
Yesterday we found a toast ring with a fracture in the big ring. It
appears to completely through the ring. Has anyone else had this
experience? I have attached two image flies showing both sides of the
ring.
https://forum.sac.ca/download/file.php?id=254
https://forum.sac.ca/download/file.php?id=253

On Sunday, June 11, 2017 at 11:34:20 AM UTC-4, howard banks wrote:
Would some kind soul who really knows please tell us whether genuine Tost rings are ever(a) welded or (b) oval?

The correct rings are stamped LN 65091 on the big ring. The most recent production also have TOST stamped on them. The big ring is oval, the little ring is round.

30+ years ago, there was a different Tost ring set in use. It is not stamped with the LN 65091 designation. It is obsolete and should not be used.

best,
Evan Ludeman / T8

The failures I have seen are not in the tost ring pair at the glider end of
the
strop but the ones further down that connect the strop to the drogue or on

either side of the weak link (a circular ring that the strop is spliced to
and is
coupled to the oval Tost link with the quick release flat), as these are an

integral part of the quick release link I assume that they should be a
genuine
Tost part, but several I have seen are welded construction and don't have
any
visible markings on them. (This is in the UK)


At 15:52 11 June 2017, Tango Eight wrote:
On Sunday, June 11, 2017 at 11:34:20 AM UTC-4, howard banks wrote:
Would some kind soul who really knows please tell us whether genuine
Tost
rings are ever(a) welded or (b) oval?

The correct rings are stamped LN 65091 on the big ring. The most recent
production also have TOST stamped on them. The big ring is oval, the
little ring is round.

30+ years ago, there was a different Tost ring set in use. It is not
stamped with the LN 65091 designation. It is obsolete and should not be
used.

best,
Evan Ludeman / T8

On Sunday, June 11, 2017 at 1:00:04 PM UTC-7, Benedict Smith wrote:
The failures I have seen are not in the tost ring pair at the glider end of
the
strop but the ones further down that connect the strop to the drogue or on

either side of the weak link (a circular ring that the strop is spliced to
and is
coupled to the oval Tost link with the quick release flat), as these are an

integral part of the quick release link I assume that they should be a
genuine
Tost part, but several I have seen are welded construction and don't have
any
visible markings on them. (This is in the UK)


At 15:52 11 June 2017, Tango Eight wrote:
On Sunday, June 11, 2017 at 11:34:20 AM UTC-4, howard banks wrote:
Would some kind soul who really knows please tell us whether genuine
Tost
rings are ever(a) welded or (b) oval?

The correct rings are stamped LN 65091 on the big ring. The most recent
production also have TOST stamped on them. The big ring is oval, the
little ring is round.

30+ years ago, there was a different Tost ring set in use. It is not
stamped with the LN 65091 designation. It is obsolete and should not be
used.

best,
Evan Ludeman / T8


Tost Connecting Rings do not have a weld. Tost states that type certification stipulates that every Tost tow release must be operated only with a ring pair meeting the LN 65091 aeronautical standard. Connecting ring pairs must be stamped with the manufacturer's name and the standard number.

WELDED RINGS ARE GENERALLY PROHIBITED. Use of welded rings voids tow release warranties. Welded rings cause damage to tow releases. Undersized rigs can lead to tow release jamming.

Connecting rings must be visually checked and measured at regular intervals.. Rings pairs that deviate from standard dimensions must be replaced.

See a ring pair picture he http://wingsandwheels.com/aircraft-p...tow-rings.html

Sean Franke