Cessna 172 F Weight and Balance

[[email protected]]

My partners and I recently purchased a 1965 Cessna 172F.

The POH has weight and balance data that you would expect, except that
it focuses on moment only, gives no arm figure. Usually no big deal.
BUT, we recently bought a 396 and it will do the weight and balance
data for you if you enter the arm data to return a CG and determine if
it is inside the weight restrictions and inside the envelope.

Does anyone know where I can find full weight and balance data on this
airplane?

THanks,

Jamie A. Landers
PP-ASEL

[Mark Hansen]

On 9/21/2005 09:02, wrote:

> My partners and I recently purchased a 1965 Cessna 172F.
>
> The POH has weight and balance data that you would expect, except that
> it focuses on moment only, gives no arm figure. Usually no big deal.
> BUT, we recently bought a 396 and it will do the weight and balance
> data for you if you enter the arm data to return a CG and determine if
> it is inside the weight restrictions and inside the envelope.
>
> Does anyone know where I can find full weight and balance data on this
> airplane?
>
> THanks,
>
> Jamie A. Landers
> PP-ASEL
>

Weight * Arm = Moment

so ... Moment / Weight = Arm

--
Mark Hansen, PP-ASEL, Instrument Airplane
Sacramento, CA

[[email protected]]

Mark Hansen > wrote:
: > Does anyone know where I can find full weight and balance data on this
: > airplane?
: >

: Weight * Arm = Moment

: so ... Moment / Weight = Arm

Also, the operating envelope is in the TCDS downloadable from the FAA. Some
STCs (e.g. engine upgrades) may modify the TCDS... thus the POH and its supplements
(if any)

-Cory

--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

[Orval Fairbairn]

In article . com>,
wrote:

> My partners and I recently purchased a 1965 Cessna 172F.
>
> The POH has weight and balance data that you would expect, except that
> it focuses on moment only, gives no arm figure. Usually no big deal.
> BUT, we recently bought a 396 and it will do the weight and balance
> data for you if you enter the arm data to return a CG and determine if
> it is inside the weight restrictions and inside the envelope.
>
> Does anyone know where I can find full weight and balance data on this
> airplane?
>
> THanks,
>
> Jamie A. Landers
> PP-ASEL

To get the arm, just divide moment by the weight.

[[email protected]]

I think I probably mis-stated the question...I'm good with the math to
get the arm...the chart of the acceptable envelope is listed as a cross
of weight and moment...wondering if there is any way I could get a CG
chart...


Orval Fairbairn wrote:
> In article . com>,
> wrote:
>
> > My partners and I recently purchased a 1965 Cessna 172F.
> >
> > The POH has weight and balance data that you would expect, except that
> > it focuses on moment only, gives no arm figure. Usually no big deal.
> > BUT, we recently bought a 396 and it will do the weight and balance
> > data for you if you enter the arm data to return a CG and determine if
> > it is inside the weight restrictions and inside the envelope.
> >
> > Does anyone know where I can find full weight and balance data on this
> > airplane?
> >
> > THanks,
> >
> > Jamie A. Landers
> > PP-ASEL
>
> To get the arm, just divide moment by the weight.

[[email protected]]

wrote:
: I think I probably mis-stated the question...I'm good with the math to
: get the arm...the chart of the acceptable envelope is listed as a cross
: of weight and moment...wondering if there is any way I could get a CG
: chart...

The TCDS has all the data you need to make one. I did that for my plane,
although the POH had it in as well.

-Cory

--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

[Kobra]

> Weight * Arm = Moment
>
> so ... Moment / Weight = Arm
>
Ok...I'm down with this, but I have another question...from these figures
refresh my memory on how you get CG.

For example if the weight is 2740 and the moment is (296.03*1000) I know the
CG is 111.326, but how is the ciphered?

Kobra

[Newps]

Kobra wrote:
>>Weight * Arm = Moment
>>
>>so ... Moment / Weight = Arm
>>
>
> Ok...I'm down with this, but I have another question...from these figures
> refresh my memory on how you get CG.
>
> For example if the weight is 2740 and the moment is (296.03*1000) I know the
> CG is 111.326, but how is the ciphered?

Simple division. And based on your weight and moment your CG is not
111.326 but is really 108.04

[Kobra]

> Simple division. And based on your weight and moment your CG is not
> 111.326 but is really 108.04

Ooops...you are correct. I took the CG from my 296 GPS and I had the wrong
arm listed for the rearseat passengers set up. I took the moment off an
excel spreadsheet I was using to work the same problem and the arm for the
rearseat passenger was correct on that. Sorry for the confusion.

Kobra