[NSRCA-discussion] Motor Mount Bonding

[Michael Cohen]

Lets see how much traffic this e-mail generates. Oh well, I was bored lately 
anyway.....  :)

Mike Cohen

----- Original Message ----- 
From: "Mike Darr" <mdarr00 at comcast.net>
To: "NSRCA Discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, March 21, 2006 5:53 PM
Subject: [NSRCA-discussion] Motor Mount Bonding


> Merle Hyde asked me to post this on the discussion page for him.
>
>
> Subj:  Soft Mount Bonding
>
> "OH" really - so the adhesive is the final solution!!!!  If the rubber
> won't tear or fail first the bond is not sufficient.  I have tested the
> latest offering and it can also be pulled apart - peels off like a tougher
> "lemon"!!!!   Modelers really "NEED" a mount in a 2-20 thousand dollar
> aircraft that can and probably will fail!!!!
>
> Approximately 40 rubber fabricators have been contacted to mass produce a
> reliable rubber bond.  They will prototype for $200,000-$300,000 with no
> guarantees.  The genuine Hyde Mount rubber bond is a 4-6 hour direct labor
> process - with a proven life of over 7000 flights.   Upon disassembly of
> high time genuine Hyde Mounts it appears the bond would likely remain
> reliable for 14,000 flights or equal to the expected rubber life!!!!
>
> Hyde Mounts are so reliable that even the severe cantilever force loads
> imposed upon the rubber bonding of NO NOSE RING required Hyde Mounts have
> been proven to endure thousands of flights without pull apart or failure.
>
> Some have experienced problems and beam breakage with undrilled nylon
> composite beam Hyde Mounts offered several years ago.   Modelers often did
> not drill or install blinds nuts per suggestions provided.  Hyde Mount 
> nylon
> beams when properly drilled are designed to break at around 100 lbs. force
> load - or at around 50G's for a 2 lb. engine - aircraft snap at around 
> 15-18
> Gs.  Hyde Mounts now with pre-drilled beams and blind nuts installed have
> only been reported to break when crashed or impacted.  The deliberate 100
> lbs. force breakage point often prevents more severe damage to the
> engine/crankshaft/firewall/aircraft/mount.
>
> Salvage your hardware investment:   Reliable rubber bonding service
> available for the "do-it-yourself" mount builder or other brands.  Simply
> send your preferred hardware parts and rubber to:  Merle Hyde
>
> --------------------------------------------------------------
>
> Thanks - Merle
>
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