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> On May 15, 2019 at 10:29, <Pete (mailto:peterz=40zutrasoft.com)> wrot
e:
>
>
>
> --> Europa-List message posted by: Pete <peterz=40zutrasoft.com>
>
> Yes, i forgot to mention gentle landings would be required as that woul
d be the weak link from my understanding.
>
> I still however do not understand the increased spar bending moment due
to increased wing mass. Il. Have to start googling :)
>
> Cheers,
> Pete
>
> > On May 15, 2019, at 4:11 AM, Richard Churchill-Coleman <richard.chu
rchill-coleman=40sky.com> wrote:
> >
> > --> Europa-List message posted by: Richard Churchill-Coleman <rich
ard.churchill-coleman=40sky.com>
> >
> > John
> >
> > I won=99t speculate on the reasons for delay in certification
as I am too aware of the law of libel. However, my understanding of the m
ain issue with increasing the MTOW is demonstrating the landing gear is c
apable of withstanding the additional loads, potentially with prop cleara
nce issues on the mono in addition.
> >
> > RIchard
> >
> > Sent from my iPhone
> >
> >> On 15 May 2019, at 08:39, John Wighton <john=40wighton.net> wrote
:
> >>
> >> --> Europa-List message posted by: =22John Wighton=22 <john=40wig
hton.net>
> >>
> >> Quote:
> >>
> >> Here in Canada we can declare whatever gross weight we want (wisely
or
> >> not). Seeing that the added weight is itself in the wing and result
s in no
> >> increased stresses, I figure I could simply increase the gross with
long
> >> wings by the same 100lbs without penalty (assuming enough HP). No=3F
> >>
> >> It is true that inertia relief can be credited to mitigate loads an
d this gives a proportional benefit with heavy wings. But to assume the s
tresses do not change is incorrect. The MG wings generate more lift, henc
e the bending moments and shear forces on the root will be higher.
> >>
> >> I believe the spar depth was changed to increase 2nd Mt of area. Th
e goal therefore may have been to match the standard a/c stresses. I have
some of Jason Russell's work on file from many years ago, it is probably
worth taking a look at that and any other design data (at LAA=3F) to see
what the margins are.
> >>
> >> I suspect that the long delay in gaining approval for the MG versio
n stems from a reduction in structural margins. Perhaps someone can tell
the story=3F=3F=3F=3F
> >>
> >> --------
> >> John Wighton
> >> Europa XS trigear G-IPOD
> >>
> >>
> >>
> >>
> >> Read this topic online here:
> >>
> >> http://forums.matronics.com/viewtopic.php=3Fp=489233=23489233
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
>
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