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chris Sinfield
Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia
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 Posted: Sat Sep 12, 2009 2:27 am Post subject: Cof G - weight and balance |
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OK
I am thinking of the C of G movement aft on the envelope
Why does the fwd line move aft of 18% when above 1080lb up to 23.3% at 1320lb? what causes that?
Chris..
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sat Sep 12, 2009 6:45 am Post subject: Cof G - weight and balance |
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Probably because you might not have enough margin in elevator
authority in the region forward of that line. The higher the weight
and more forward the CG, the more elevator is needed to keep the nose
up.
On Sep 12, 2009, at 6:27 AM, chris Sinfield wrote:
| Quote: |
>
OK
I am thinking of the C of G movement aft on the envelope
Why does the fwd line move aft of 18% when above 1080lb up to 23.3%
at 1320lb? what causes that?
Chris..
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--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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chris Sinfield
Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia
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| Posted: Sun Sep 13, 2009 12:49 pm Post subject: Re: Cof G - weight and balance |
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Thanks Bryan
not many others responded with the answer, I wonder if they all have this reduction in C of G range in their flight manuals..
Maybe someone going to the Zenith get together could ask Seb?
Chris
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Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
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| Posted: Sun Sep 13, 2009 6:20 pm Post subject: Cof G - weight and balance |
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Chris
You raise an interesting point. The situation is bit more complex than a
simple reduction in CG range. A year ago, I found a W&B data sheet on
zenithair.com, called wb-xl-new.pdf, with the date 1/02 on it. I can no
longer find that document on the site. Of course that doesn't mean it's not
there. There's lots of stuff that I can't find on that site.
The 1st attached jpg shows a figure from that pdf.
Within that past year, I found an AMD POH dated 12/05 on the net which
contained that same diagram, see 2nd attach.
Those CG ranges are rectangles 20 to 30% of MAC.
The AMD POH that was referenced in Zodiac Update of 7/27/09, contains the
diagram shown in the 3rd attachment. I presume that shows the reduction you
are referring to. Looking at the front of the range, one can see that it
now extends forward of the former 20% (12 inch) envelope. But at a reduced
take-off weight. The reduced take off weight also applies between 12" and 14".
Bryan's explanation sounds plausible. You are right, somebody should ask
the Zenair folks what is going on.
Terry
At 01:49 PM 9/13/2009 -0700, Chris wrote:
| Quote: | Thanks Bryan
not many others responded with the answer, I wonder if they all have this
reduction in C of G range in their flight manuals..
Maybe someone going to the Zenith get together could ask Seb?
Chris
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| Quote: | >
>
>Probably because you might not have enough margin in elevator
>authority in the region forward of that line. The higher the weight
>and more forward the CG, the more elevator is needed to keep the nose
>up.
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Terry Phillips ZBAGer
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons
are done; waiting on the wings
http://www.mykitlog.com/N47TP/
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_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
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chris Sinfield
Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia
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| Posted: Sun Sep 13, 2009 8:03 pm Post subject: Re: Cof G - weight and balance |
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Spot on the money Terry
I wonder what gives.???
I have the older W&B forms as well and that is why I am asking about the changes..
Someone must know the reasons why the change in the AMD manual, how about all you AMD owners, what did they tell you ???
Chris
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Doug.Norman(at)sportaviat
Guest
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| Posted: Mon Sep 14, 2009 12:11 am Post subject: Cof G - weight and balance |
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As explained in a previous response, it has to do with elevator authority at
slower speeds during TO&L. Remember that the AMD airplanes use the O-200a
engine which is fairly nose heavy.
Doug
AMD CH601XL N601DN
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