Neil Unger wrote:
Paul,
   The glastar requires the engine to be offset 1.8
degrees right and 1.5 degrees down.  I am assuming
that to measure this I can apply the 1 in 60 rule.
1 degree is 1 foot in 60 feet. Am I correct ??
 Neil.

The sin of the angle is the opposite over the
hypotenuse. If 1/60 = the sin of one degree than
that is correct. Believe it or not I have never
heard of that rule. :) 1/60 is .0166666
While the  sin(one degree) = 0.0174524064
http://www.google.com/search?hl=en&q=sin+of+one+degree&btnG=Search&aq=f&aqi=h1&aql=&oq=
Obviously 1 in 60 rule is incorrect if we
are being precise.

Usually a bubble protractor can be bought
to measure small angles.

Since you are obviously setting up
a motor mount it is more complicated than
that. What you need to know is the position
of the hole in the cowl. Do you have the cowl
now? It also helps if you have the gear box.

Usually the hole in the cowl is centered in the
cowl and a point at the center of the prop flange
is the pivot point. Now if you are sure that
is the case than we can proceed from there
designing the motor mount.

Is that the final goal?

The dwg I did for you did not have those angle
off sets so I will start over. Not much of a
problem and it won't take me long.

In general the motor mount should be the last item
fabricated.

Paul Lamar

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Hi
The one in sixty rule is a quick rule of thumb used in navigation it works
very well eg if you are one mile left of track in 60 miles then  you are one
deg  left of track , 3 miles in 60 then 3deg  and so on.

Paul m