subject line.
Hello Gary
The info on the data point can also be found in the Pilots Operating Manual
pg 3 and in Murphy's Technical Bulletin 041098rb both of which I believe can
be found on Bob Patterson web site. The info is a little hidden and easy to
miss i.e. First the manual says that 20% of the 60" cord is 10.85".
obviously 20% of 60" is 12". In order to find the correct datum point you
have to subtract the distance from the wings leading edge to the center of
the axle, or 12" minus 1.15" = 10.85". If for some reason the measured
distance from your leading edge to your axle center were different than
1.15", you would have to subtract that figure from 12" to find the datum
point, or move your axle. Hope this helps.
Charlie
----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <rebel-builders@dcsol.com>
Sent: Saturday, February 12, 2011 6:03 PM
Subject: Re: [rebel-builders] Question of Rebel Datum location/ Cof G range
Gary.. the axle center line is not ahead of the leading edge! It is indeed
AFT of the wing leading edge.
----- Original Message -----
From: "Gary Gustafson" <gargus@comcast.net>
To: <rebel-builders@dcsol.com>
Sent: Saturday, February 12, 2011 6:56 PM
Subject: RE: [rebel-builders] Fwd: Murphy Rebel baffles
I just finished re-measuring and weighing N52GG this past
weekend and after doing so, I decided to look at W&B emails
in the Murphy Rebel builders section. I came across the
following email which now bothers me from several days ago.
______________________________________________
On Date: 2/3/2011 4:33 PM the following email was posted by
Charlie E
Jesse
A couple years back I asked a similar question to MAM.
The answer I got from Darryl Murphy was:
Hello Charlie
I think the confusion is that the data point (center of axle)
is approximately 1.15" aft of the leading edge. 20% of 60" = 12",
12" - 1.15" = 10.85" A.O.D. (aft of datum).
Hope this helps.
Cheers Darryl"
_________________________________
The concern is that is 1.25" ahead of the leading edge of
the wing, not 1.15" aft of the leading edge. That is a difference
of 2.45". WOW. I had 2 certified aircraft mechanics doing the
measurements and they were done twice with almost (less than .2")
when the other person did his measurements. So did Darryl make a
mistake in his response??? My plane was built to the manual so
I do not understand that there could be that much difference.
Anyway this should promote an interesting discussion.
Gary G
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