3M Engines

[Dean Pappas]

Hi Wayne,
As you know ... vibration is much more interesting than that. (interesting ... that's code for confusing) Just think about the side to side loads due to the acceleration of the crankshaft counterweight at the same moment as the beginning of the engine's torque impulse. The calculations are all possible, and I refuse to do them! I did the experiment, it didn't take much time, and both two and four-strokes shook no more than I am used to.
Later,
	Dean


-----Original Message-----
From: wgalligan [mailto:wgalligan at cnbcom.net]
Sent: Monday, April 28, 2003 4:32 PM
To: discussion at nsrca.org
Subject: Re: RE: 3M Engines


By doing so you are increasing the the mass around the center of the mount.
Sure it will work but you are adding addition leverage by moving the engine off center. Increasing vibration or the force behind it.  Thinkof it as a lever principle.  The further out the lever(engine cylinder and prop) is the easier it is to move the load(mount).  Just my observation.  Any time you can keep the weight of the mass closer to the center of rotation the better you are.  You are also off setting the leverage point thus putting an uneven pressure on the mount disks. 

Boy finally got to use some of the geometry I studied 3O yrs ago.

Wayne

 > Hi,
> With the Hyde mount inverted, the engine mounting surface is about 1/2" > higher than the center of the hockey-puck. The whole mount moves down > the same amount ... so the firewall gets three new mounting holes. I > have had no problem with both an FZ a number of two-strokes in the > JEKYLL. You need a nose-ring, of course.
> Dean
> 
> -----Original Message-----
> From: wgalligan [mailto:wgalligan at cnbcom.net]
> Sent: Monday, April 28, 2003 1:51 PM
> To: discussion at nsrca.org
> Subject: Re: 3M Engines
> 
> 
> Why would you have to drill new hole in the firewall.   The 3M fits just > like an O.S. 1.40 to the dimension.  If you use the oring header and > already have an engine mounted the header coupler may hit.  This is > cured by moving the engine out to the end of the mount beams.  If the > engine mount is already set in the plane then a Karl Mueller header > willl work.  He makes one for us that fits great and will clear the > mount.  His headers are T&A  <VBG> or email me off list for the fix I > have and I'll send ou a photo.
> 
> WG
> 
>   thinking out loud. 
> > 
> > Would that not put the center of the engine off the center of the  > > mount? Like maybe 3/8" off center? Does it matter?
> > 
> > GW
> > 
> > 
> > 
> >   ----- Original Message ----- 
> >   From: Dean Pappas 
> >   To: discussion at nsrca.org 
> >   Sent: Monday, April 28, 2003 10:05 AM
> >   Subject: RE: 3M Engines
> > 
> > 
> >   The standard Hyde mount will accomodate the 3M or O.S. headers if it > > is inverted. This does require drilling new holes in the firewall.
> >   Regards,
> >   Dean P.
> >     -----Original Message-----
> >     From: Kenneth Velez [mailto:kvelez at rochester.rr.com]
> >     Sent: Wednesday, February 26, 2003 9:42 PM
> >     To: discussion at nsrca.org
> >     Subject: 3M Engines
> > 
> > 
> >     Hello everyone,
> > 
> >     I have a question to those using the 3M Mintor engines. I'm trying > > to figure out if the exhaust port bolt pattern is the same as in the > OS > 1.40 RX. I can not use the stock heather on my plane set up because > it > hits the engine mount and I was wondering if the Mac's heather for > the > OS will fit.
> >     Thanks in advance.
> > 
> >     Ken V.
> 
> =========================> ============
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> # discussion-request at nsrca.org
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