Today's Message Index:
----------------------
1. 01:28 AM - Re: Vne and flutter explained - Australian Flying (John Wighton)
2. 01:31 AM - Re: Lighter tailwheel (John Wighton)
3. 01:56 AM - Re: Vne and flutter explained - Australian Flying (clivesutton)
4. 03:36 AM - Re: Vne and flutter explained - Australian Flying (Remi Guerner)
5. 03:42 AM - Re: Vne and flutter explained - Australian Flying (clivesutton)
6. 06:29 AM - Re: Re: Lighter tailwheel (Richard Scanlan)
7. 07:44 AM - Re: Re: Vne and flutter explained - Australian Flying (D McFadyean)
8. 09:53 AM - Classic (MikeP)
9. 10:19 AM - Re: Classic (david park)
Message 1
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| Subject: | Re: Vne and flutter explained - Australian Flying |
Pete,
The article is 10 years old -a period which represents approximately 1/12 (or 8%
ish) since Wright Bros made their mark. Much can happen in a very short time,
primarily due to the predictive tools we (as aeronautical engineers) have at
our disposal.
Jim's excellent article does, however, still contain good information. The key
elements being that there is a significant factor between Vne and Vd (typically
1.3-1.4), and that flutter should not occur before 1.2Vd. Hence no sane pilot
should get anywhere near. But that also assumes an aircraft is in tip-top
condition.
A simple route is to always fly using IAS. Ensure you have calibrated your ASI,
hence you are effectively flying CAS.
This actually ignites a pet subject of mine - the LAA permit renewal flight test,
which requires us all to be Test Pilots for the day - reaching Vne. A little
bit like cycling toward the edge of Beachy Head but (skillfully) avoiding plummeting
over the edge. We congratulate ourselves we are still alive - and then
have to go and do it again next year..........
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498828#498828
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| Subject: | Re: Lighter tailwheel |
Not cheap by any means but a Ti leg and wheel is about as light as you will get.
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498829#498829
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| Subject: | Re: Vne and flutter explained - Australian Flying |
Hi Peter, thanks for posting this link to an excellent article - that explains
more clearly than i've ever seen anywhere, how Flutter is initiated and influenced.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498830#498830
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| Subject: | Re: Vne and flutter explained - Australian Flying |
Great article on this critical subject. It would be interesting to find out how
the Europa has been evaluated during flight testing of the prototypes, especially
at what max altitude the Vd testing has been actually performed.
BTW it is always instructive to look at certificated aircraft manuals and see how
they handle any issue. The attached page is from the Cirrus SR22T POH. It shows
how they handle the VNE/flutter issue at high altitude. The VNE IAS is reduced
linearly above 17500 ft. from 205 kts to 175 kts at 25000 ft. Very few Europas
are operated at such high altitudes, but it may be advisable for their
pilots to consider reducing their VNE as Cirrus do.
Surprisingly Cirrus also reduce the VNO above 17500 ft: obviously this has nothing
to do with flutter, so why?
Remi Guerner
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498831#498831
Attachments:
http://forums.matronics.com//files/v_limits_sr22t_120.png
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| Subject: | Re: Vne and flutter explained - Australian Flying |
Good points John.
RE: the LAA annual VNe dive- what is your understanding of the reasoning behind
this LAA (supported by the UK CAA), requirement?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498832#498832
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| Subject: | Re: Lighter tailwheel |
Hi John, can you give more details on this? Ti leg?
Sent from my iPad
> On 15 Oct 2020, at 09:30, John Wighton <john@wighton.net> wrote:
>
>
> Not cheap by any means but a Ti leg and wheel is about as light as you will get.
>
> --------
> John Wighton
> Europa XS trigear G-IPOD
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498829#498829
>
>
>
>
>
>
>
>
>
Message 7
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| Subject: | Re: Vne and flutter explained - Australian Flying |
I'm happy that my Europa is only cleared to 1300lbs MTOWA and therefore I only
have to Vne-dive to 150knts, leaving the XSs to explore the class-envelope at
a much higher speed!
Duncan McF
do not archive
> On 15 October 2020 at 09:28 John Wighton <john@wighton.net> wrote:
>
>
>
> Pete,
>
> The article is 10 years old -a period which represents approximately 1/12 (or
8% ish) since Wright Bros made their mark. Much can happen in a very short time,
primarily due to the predictive tools we (as aeronautical engineers) have
at our disposal.
>
> Jim's excellent article does, however, still contain good information. The key
elements being that there is a significant factor between Vne and Vd (typically
1.3-1.4), and that flutter should not occur before 1.2Vd. Hence no sane
pilot should get anywhere near. But that also assumes an aircraft is in tip-top
condition.
>
> A simple route is to always fly using IAS. Ensure you have calibrated your ASI,
hence you are effectively flying CAS.
>
> This actually ignites a pet subject of mine - the LAA permit renewal flight test,
which requires us all to be Test Pilots for the day - reaching Vne. A little
bit like cycling toward the edge of Beachy Head but (skillfully) avoiding
plummeting over the edge. We congratulate ourselves we are still alive - and
then have to go and do it again next year..........
>
> --------
> John Wighton
> Europa XS trigear G-IPOD
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498828#498828
>
>
>
>
>
>
>
>
>
Message 8
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Have just had one of the outriggers break, fortunately no damage.
Anyone in the UK got one or two after a tri-gear mod or just have a spare?
Thanks
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498837#498837
Message 9
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Will search garage tomo
Dave Park G-LDVO
> On 15 Oct 2020, at 18:07, MikeP <mpotts@clara.net> wrote:
>
>
> Have just had one of the outriggers break, fortunately no damage.
> Anyone in the UK got one or two after a tri-gear mod or just have a spare?
>
> Thanks
> Mike
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498837#498837
>
>
>
>
>
>
>
>
>
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