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At 01:25 14 September 2016, BobW wrote:
On 9/13/2016 4:24 PM, Don Johnstone wrote: At 17:28 13 September 2016, BobW wrote: That said - and since a number of these hooks have been installed into the noses of German-built ships originally entering the USA with only a CG hook - owners of ships with these hooks SHOULD (and easily can) VERIFY the presence/absence of such a compression spring by checking to see if the pawl is positively forced against the rotating piece of the cable hook throughout its rotation range. Positive engagement = spring- present. Bob W. I am now confused by the "installed in German" part. Is the release you are talking about a TOST release? Sorry for any confusion. A number of "Applebay releases" have been subsequently installed in (on the fuselage bottom surface, near the front of the nose of) non-USA-built gliders imported into the USA with only a single, CG-mounted, release back by the wheel. This second cable attachment point provided "a nose-hooked aero-towing option." Many - not all - such modified ships were of German origin. FWIW, I've been privately informed by a fellow Zuni owner (of S/N 28) that his ship's release uses a(n easily visible) *tension* spring (not compression, as on S/N 2) to positively seat the pawl against the rotating/indented cable hook part...which is what my fallible memory kinda-sorta remembered from my own (not recently looked at) Zuni (S/N 3). In either case, any owner of a ship with an "Applebay nose release" can/should easily confirm the presence of such a spring by verifying the business end of the pawl is "somehow or other" positively forced against the rotating cable hook as it operates throughout its range of motion. The truly curious can disconnect it before operating their releases to get a better feel for what I sought to describe in an earlier post. Please do reconnect it...or YMMV! Bob W. Thanks for that. My ASW17 was fitted with a TOST winch hook near the nose for aerotow. There was a wooden block installed behind the back release ring to prevent it's operation as a back release function on an aerotow hook is undesirable. Back in the 60's we would tape up winch launch hooks to prevent the back release from operating when aerowtowing. |
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