The Murphy Builders Site

So Jason... I'm not being exact.. but I looked at my own amphib w & b....
nose wheel is 54 inches ahead of wing leading edge or there abouts...
suspect that makes the top front edge of the float deck around 57 inches
forward of the leading edge... so if Muphy's allowable c of g range is
stated as 7.7 to 19.7 (or if you want to use the newer one do so).. you'd
have a allowable c of g range of 64.7 to 76.7" aft of "datum", if your
front
edge of the float deck is now your datum point. Of course you need to use
your own numbers as you may have mounted them more aft or fwd than I did.

Wayne

----- Original Message -----
From: "Rebecca Brownell" <brownell@cottagecountry.net>
To: <rebel-builders@dcsol.com>
Sent: Sunday, February 13, 2011 8:32 PM
Subject: Re: [rebel-builders] Question of Rebel Datum location/ Cof G
range

Thats what I did today.Have all the weights and distances for both
datums(door post and the front of the top rail on the floats)It's a
question of how to do the math.Have to dig into the text books again I
guess.I left the battery unsecured till I know where I need to put
it.I'll be sure to do the mechanical test with the pipe to be sure.
Thanks
Jason
On 13-Feb-11, at 8:16 PM, Wayne G. O'Shea wrote:

As I alluded to before Jason.. Call your MDRA inspector.. they seem
to have
an issue with no negative numbers in your W & B calculations. I guess
Alexander can't figure out subtraction.....

If that is the case.. use your nose wheel or the end of the float
deck as
your datum so everything is postive behind it. Be sure to get an
accurate
measurement to the center of the door post or leading edge for when
you
switch to conventional gear and to convert the Murphy 7.7 to 19.7
(or what
ever the current spelled out) WING range to reflect your datum.. IE:
your
empty C of G range is now gonna be MAM's numbers PLUS the distance
from the
leading edge to the nose wheel or float deck end.

Wayne


----- Original Message -----
From: "Rebecca Brownell" <brownell@cottagecountry.net>
To: <rebel-builders@dcsol.com>
Sent: Sunday, February 13, 2011 8:06 PM
Subject: Re: [rebel-builders] Question of Rebel Datum location/ Cof
G range




-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------