[NSRCA-discussion] Motor Mount Bonding
George Kennie
geobet at gis.net
Wed Mar 22 10:40:13 AKST 2006
Speaking of Monokote!,............I noticed some irregularities a
couple of planes back, but couldn't really put my finger on anything
specific, thinking it was probably some oversight in my application
technique (too little heat, too much heat?). Then I built an
Exceleron and decided to do a little trim scheme on the wheel pants
using Monokote as the trimming agent, which I had done many times in
the past (and I stress MANY).I used regular Monokote, (not the Trim
Strip variety) and cut out my design and ironed it on and it
appeared to be O.K. I set the plane aside and came back a couple of
days later only to find all of the trimming designs lying on the
floor beside the wheel pants.
I have had several instances since then where I had similar results
trying to get the stuff to adhere to any painted surface.
I just completed a small bird that I costructed quite lightly with
the nose of the aircraft being planked and everything from the T.E.
back being open structure.Due to the fact that I made the canopy out
of glass I decided to paint the forward part of the fuse and film
the aft portion. Everything went pretty much O.K. until I got to the
point of trimming. In the areas where the trim was applied over
MonoKote it seemed to be normal, but when the trim was applied to
the painted portion of the fuse I had difficulty making the stuff
stick, and indeed, I have re-ironed it down about 6 or 8 times since
it's original application. I have been toying with the idea of maybe
trying to use some Balsarite under the trim to see if I can get it
to stick to the paint, but have some apprehension about whether the
Balsarite might raise havoc with the paint (Concept).
The other thing that I've noticed is that it is now much easier to
lift Monokote film that you have previously applied by using a
little heat and the stuff comes up easily. In the old days, if you
tried to lift the stuff the color would be left behind and you would
have transparrent cellophane on your hands.
At the Wram's Show, I picked up a Quest from Eric and I noticed that
the covering material being used by this manufacturer is different
than either Mono or Ultra in that it appears to have a weave
structure in the backing. Almost looks like Coverite if you look at
the backside, but the front side is as glossy as Monokote. It's also
quite strong and stretchy if you try to pull it apart. The adhesive
appears to be quite strong as well. It is possible to lift it with
the application of heat, but it leaves significant color stuck to
the underlying surface.It appears, to me, to be a really good
quality film, not at all like the old "Chinese Shelf Paper." Maybe
Great Planes would be well served to do a little research?
Georgie
mike mueller wrote:
> I've recently switched from using El's mounts made in Canada to
> Budd mounts. The weight savings is 3 oz. over the Hyde type
> mounts. That's significant in anybody's book. Jerry also has
> excellent customer service and responds to emails which is
> refreshing these days. Seems to me that he has takin a totally
> proactive approach to fix a problem. Now the Monokote people are
> another story! Mike
>
> jeffghughes at comcast.net wrote:
>
> Seems like a little bit of a low blow, considering Jerry
> was trying to make things right with his customers.
>
> -------------- Original message --------------
>
> From: "Michael Cohen"
> <precisionaero at comcast.net>
>
> > Lets see how much traffic this e-mail
> generates. Oh well, I was bored lately
> ! > anyway..... :)
> >
> > Mike Cohen
> >
> > ----- Original Message -----
> > From: "Mike Darr"
> > To: "NSRCA Discussion"
> > 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 ca! n 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 f! ailure.
> > >
> > > 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
> > > n! ylon
> > > 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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> > >
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>
> > >
> >
> >
> >
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