Today's Message Index:
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1. 01:50 PM - Re: Cof G - weight and balance (chris Sinfield)
2. 07:20 PM - Re: Re: Cof G - weight and balance (Terry Phillips)
3. 09:04 PM - Re: Cof G - weight and balance (chris Sinfield)
Message 1
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| Subject: | Re: Cof G - weight and balance |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=262820#262820
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| Subject: | Re: Cof G - weight and balance |
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:
>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
>>
>>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.
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/
Message 3
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| Subject: | Re: Cof G - weight and balance |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=262890#262890
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