Procedure for calculating weight and balance

In article ,
"Morgans" wrote:

"Orval Fairbairn" wrote

The POH will list the arms for each seat, fuel, oil, baggage, etc.

Are you sure you want to be answering this putz? I beg of you; reconsider.

He sounds like a precocious 12-year-old, so I can cut him some slack. He
DOES ask some pertinent questions, like this one.

An ATP friend of mine almost had W&B taught him the HARD way a couple of
years ago. We calculated his CG to be about 6 inches aft of allowable,
after he had a near incident.

I showed him how to set up a general program and opened his eyes. He
became a very strong advocate after that.

"Morgans" wrote in message
...

"Orval Fairbairn" wrote

The POH will list the arms for each seat, fuel, oil, baggage, etc.

Are you sure you want to be answering this putz? I beg of you;
reconsider.
--
Jim in NC

I think its you who should not get answers.
This is a good thread

Morgans wrote:
Are you sure you want to be answering this putz? I beg of you; reconsider.

Jim, some friends were reading this thread, and brought up a question.

If you really believe that not answering Mx is a Good Thing, then why
aren't you trying to get the prolific writers like TxSrv, BT, and
Thomas to stop answering him? Without their dozens of responses,
there'd be a lot fewer postings in his threads. I mean, a LOT. All
they do is give him more to reply to.

Is it because you think it's okay to waste everyone's time bashing him?
That seems pretty counter-productive. It doesn't make him go away.

Thanks,
Kev

FAA Advisory Circular AC 120-27E
Aircraft Weight & Balance Control

This is used by the builder to construct the W&B for certification, also
printed in the aircraft Type Certificate (TC)

FAA-H-8083-1 Aircraft Weight & Balance Handbook

Blanche Cohen writes:

FAA Advisory Circular AC 120-27E
Aircraft Weight & Balance Control

This is used by the builder to construct the W&B for certification, also
printed in the aircraft Type Certificate (TC)

FAA-H-8083-1 Aircraft Weight & Balance Handbook

Thanks! I've located and downloaded both. They should be very
helpful, particularly the latter.

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Mxsmanic opined

Neil Gould writes:

The calculations are simple math. Why would you need a pointer to anything
but an elementary math book?

I'm sure the calculations are simple, but I still need an explanation
of which calculations to perform.
__
\
\
arm * weight = (arm * weight )
aircraft aircraft / components components
/__





-ash
Cthulhu in 2007!
Why wait for nature?

No one places the loads to exactly so as to balance the airplane. The
elevator downward force is increased or decreased during flight to
balance the airplane for varying load conditions. For example, when a
passenger walks forward, the elevator downward force must be increased
to counteract that. The CG is calculated using the moments and arms to
make sure that it falls within the approved limits. If the CG falls too
far forward or too far backward, the elevator may not be able to
provide the force necessary to balance the airplane.
See he http://en.wikipedia.org/wiki/Center_...%28aircraft%29


Mxsmanic wrote:
The manual for my aircraft gives figures for MOM and ARM at various
stations, but it doesn't actually explain how to use these to
calculate weight and balance. I want to place the load so that the
aircraft neither pitches down nor pitches up. Can someone provide me
with a pointer to an explanation of the procedure on the Web
somewhere?

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Andrew Sarangan writes:

No one places the loads to exactly so as to balance the airplane. The
elevator downward force is increased or decreased during flight to
balance the airplane for varying load conditions. For example, when a
passenger walks forward, the elevator downward force must be increased
to counteract that. The CG is calculated using the moments and arms to
make sure that it falls within the approved limits. If the CG falls too
far forward or too far backward, the elevator may not be able to
provide the force necessary to balance the airplane.
See he http://en.wikipedia.org/wiki/Center_...%28aircraft%29

I didn't realize Wikipedia had an article on this. I'll take a look.

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also check faa.gov AC-61-238 "Pilots' Handbook of Aeronautical
Knowledge" will answer all your questions (I hope).


Mxsmanic wrote:
Andrew Sarangan writes:

No one places the loads to exactly so as to balance the airplane. The
elevator downward force is increased or decreased during flight to
balance the airplane for varying load conditions. For example, when a
passenger walks forward, the elevator downward force must be increased
to counteract that. The CG is calculated using the moments and arms to
make sure that it falls within the approved limits. If the CG falls too
far forward or too far backward, the elevator may not be able to
provide the force necessary to balance the airplane.
See he http://en.wikipedia.org/wiki/Center_...%28aircraft%29

I didn't realize Wikipedia had an article on this. I'll take a look.

Stubby writes:

also check faa.gov AC-61-238 "Pilots' Handbook of Aeronautical
Knowledge" will answer all your questions (I hope).

Section 12 explains the principles behind it, but it didn't actually
say how to calculate the center of gravity, or how to achieve neutral
trim (which nobody seems to care about except me).

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