The Murphy Builders Site

Hi Ted !

No builders have offered explanations, but one might be:

The W & B Samples in the manual are just that; "SAMPLES" -
- apparently, too many builders take the numbers directly from
the case loading samples and use them for their TC or FAA filings !!

According to the Moose POH, the baggage is 70" from
the main wheel axle, which is often used as the datum point.
It also says the C of G range is: 10.8" to 20.4" aft of that
datum point.

That was from the factory Moose POH - I gather you are
supposed to make up your own POH for your own Moose,
with your own actual weights, to be legal ....

I just checked - I can't find the Moose POH on the web site
anywhere !! Can you see it ??? If not, I will have to get a
copy of the PDF posted to the Moose Tech Support page ASAP !

--
......bobp
bobp@prosumers.ca
http://www.prosumers.ca/Ramble09

http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
http://apatterson2.ordermygift.com

-------------------------------orig.-------------------------
On Monday 02 March 2009 15:51, Bob Patterson wrote:

Hi Ted !

I suspect that '30 gallons' was meant to be '30 gallons per side',
for a total of 60 gallons - the original standard fuel capacity....

As for the 49" - I dunno ..... of course, it could be 49" from
SOME point - you CAN choose ANYWHERE as a datum, even somewhere
1 mile in front of the aircraft ! You would expect that all measurements
would relate to the SAME datum point, though ... ;-)
It would be very unusual to measure from an 'operational C of G' ....
a moveable point !

Maybe there will be an explanation forthcoming.

--
......bobp
bobp@prosumers.ca
http://www.prosumers.ca/Ramble09

http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
http://apatterson2.ordermygift.com

-------------------------------orig.-------------------------

On Monday 02 March 2009 15:15, Ted Waltman wrote:

In the Chapter 26 SR-2500 weight and balance section, page 2, they show
a sample weight table. In this table, the factory has a sample fuel
load of 30 gallons weighing in at 360 lbs! What kind of fuel weighs 12
lbs/gallon? Maybe I'm missing something here-someone please let me know
if I've overlooked something.



They also show the baggage arm at 49" in that same sample weight table.
I'm assuming the 49" figure is based off the "Operational center of
gravity" which is calculated at 12.4" on the previous page (49 + 12.4 =
61.4"). The baggage area moment is listed as 65.0" in a previous
figure. As this 65 is close to the 61.4" maybe this is what they are
doing in the table?



Perhaps someone at the factory will see this and issue a corrected page
/ table with better explanations in the technical support section of the
website.



Ted Waltman

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