Procedure for calculating weight and balance

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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Mxsmanic,

which nobody seems to care about except me)


Ah, time to take a clue, isn't it?

Why would "neutral trim" be important? For that matter, what would it
be?

What you get is a range of allowable CGs, which often depends on total
weight. This all has to do mostly with elevator authority. Trim (as in
the trim wheel) is not really important, trim is just a tool to relieve
the pilot. Trim as in weight distribution, well, see above.

Once you've figured this out, ponder why an aircraft will be faster or
consume less fuel if the CG is as aft as possible.

--
Thomas Borchert (EDDH)

Thomas Borchert writes:

Why would "neutral trim" be important?

It allows for maximum control movement in both directions.

For that matter, what would it be?

Neutral trim in cruise, usually.

What you get is a range of allowable CGs, which often depends on total
weight. This all has to do mostly with elevator authority. Trim (as in
the trim wheel) is not really important, trim is just a tool to relieve
the pilot.

Any trim adjustment has an effect on the remaining elevator authority
beyond the trimmed position.

Once you've figured this out, ponder why an aircraft will be faster or
consume less fuel if the CG is as aft as possible.

I'm not worried about speed or fuel consumption. I'm not in a rush,
and I generally take off with full tanks, at least in the Baron.

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Mxsmanic,

It allows for maximum control movement in both directions.

Maximum relative to what? What do you think the CG limits set forth by the
manufacturer are made for? Why would they matter in certification? Why would
a manufacturer and a certification authority consider them sufficient? How
much control movement do you "lose" when fully trimming to one side?

I'm not worried about speed or fuel consumption.

I know. You're playing MSFS, a game.

But if you where truly interested in these questions, then you'd find the
answer very educational. But again you show that you're not. You're an
imposter, bending the limits of your interest to maximize insult to the
pilots here. That's how you derive an "ego increase" from your visits to
this group. Pathetic! But interesting.

--
Thomas Borchert (EDDH)

Mxsmanic wrote in
news
Thomas Borchert writes:

Why would "neutral trim" be important?

It allows for maximum control movement in both directions.

hehehe....are you trying to avoid a building? small controll movements
are key to a smooth flight.

For that matter, what would it be?

Neutral trim in cruise, usually.

Neutral trim in cruse is not neccisarly good. read about it.

What you get is a range of allowable CGs, which often depends on
total weight. This all has to do mostly with elevator authority. Trim
(as in the trim wheel) is not really important, trim is just a tool
to relieve the pilot.

Any trim adjustment has an effect on the remaining elevator authority
beyond the trimmed position.

again, how much elevator do you need? small controll inputs... save up
some money and go take a discovory flight at least. It will give you an
idea of the fine cotrol one needs...and perhaps answer questions like
this.

Once you've figured this out, ponder why an aircraft will be faster
or consume less fuel if the CG is as aft as possible.

I'm not worried about speed or fuel consumption. I'm not in a rush,
and I generally take off with full tanks, at least in the Baron.


ok, then drive. or if your just intrested in seeing the world from
above, fly a balloon.

"Mxsmanic" wrote in message
news
Thomas Borchert writes:

Why would "neutral trim" be important?

It allows for maximum control movement in both directions.


It Does??? well... that is news to me

Changing the trim setting does not change the set screws (Stop bolts) that
limit the amount of Rudder, Aileron or Elevator travel.

BT

Mxsmanic wrote:

Thomas Borchert writes:


Why would "neutral trim" be important?


It allows for maximum control movement in both directions.



The trim doesn't affect the total control movements one iota.


Any trim adjustment has an effect on the remaining elevator authority
beyond the trimmed position.

It does no such thing.