REFLECTOR: dynafocal engine mount, fit---Catch 22

[Laurence Coen]

The mount takes the right shape with the weight of the engine on it but you 
can't mount the engine till it's the right shape.

Larry Coen
Been there, done that.

--------------------------------------------------
From: "Andy Millin" <amillin at sbcglobal.net>
Sent: Thursday, May 15, 2008 8:38 AM
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Subject: Re: REFLECTOR: dynafocal engine mount, fit

> The mount is conical.  The geometry is specific and will only work one 
> way.
>
> The first try for me was frustrating.  I was sure the guys who made this
> didn't quite know what they were doing.
>
> The issue is in the Barry mounts.  Of course they are some type of polymer
> and need to be compressed slightly for the whole thing to line up.
>
> The bottom of the mount is "open"  i.e. the two sides are not attached. 
> We
> got the top bolts in, but could only get one of the bottom.  Each new bolt
> that went in made it more difficult to put the next in.
>
> We needed to make it spread about 1/8" to open it enough to get the bolt 
> in.
> That was what the 2x4 was for; a big lever.
>
> Once the bolts are in and torqued, the geometry was realized.  Nothing to 
> do
> but stand back and say "yep, they did know what they were doing."
>
> I like the drift pin/bullet bolt idea.  Another one of those "doh" type
> ideas.  :)
>
> Andy
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Al Gietzen
> Sent: 05-15-2008 2:30
> To: 'Velocity Aircraft Owners and Builders list'
> Subject: Re: REFLECTOR: dynafocal engine mount, fit
>
> One used the 2x4
>> to
>> pry the mount open and the third slid the bolt in.  I don't know if it is
>> the same for the IO-360.  I know I don't want to have to take the thing
>> off
>> again.  :)
> I know zip about mechanical design but my gut-feeling about the stress in
> the engine mount
> joints if it was off enough to have to use a 2x4 to deform it is scary.
>
> I'd assume it is still within the elastic limit; but  wouldn't the idea be
> to drill the holes to fit the mount rather than stress the mount to fit 
> the
> holes?
>
> Al
>
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