Let's go back to ground school. To keep it simple, consider straight and
level flight: additional weight requires more lift to balance the forces,
but to generate more lift the wing's angle of attack must increase, and at
greater angles of attack more drag is induced. To overcome the additional
drag we have two choices (or a combination of the two): add power or accept
slower speed. Obviously things are not quite this simple because, for
example, if we let the speed decrease that increases the induced drag but
the parasitic and interference drag both decrease for a net reduction in
drag (except in slow flight where the total drag increases as speed is
reduced).
A practical demonstration of the incremental improvement from weight
reduction is provided by some airlines that go so far as to leave most of
the fuselage unpainted, not because they like the look of shiny aluminum but
specifically to decrease fuel burn at cruise (lower weight, same speed,
reduced power, lower fuel burn).
Best regards,
Rob Housman
A070
-----Original Message-----
From: owner-europa@post.aviators.net
Subject: Re: Realalistic airspeeds
Not at all contraire. Building light greatly improves T/O and climb but I
think has little effect on speed. Reducing drag increase speed but its hard
for me to see how Kim has acheived the sorts of reduction in drag necassary
to give the speeds that I have heard quoted. I didn't say he claimed to be a
deity, they never do, do they? He's clearly very talented and whilst his
acheivments may set admirable targets for mere mortals I think it would be
appropriate to make it clear that most builders (all that I know of so far)
fail to acheive anything like the figures acheived by Kim.
Jerry
LTS@avnet.co.uk
www.avnet.co.uk/touchdown
----- Original Message -----
From: "Rob Housman" <ROB-HOUSMAN@worldnet.att.net>
"Karp" <karp@montrose.net>; <europa@avnet.co.uk>
Subject: Re: Realalistic airspeeds
> Au contraire, the performance of Kim's aircraft is indeed relevant for the
> rest of us even if it is only as a benchmark.
>
> Although Kim's build philosophy may include a religious attention to
detail
> he makes no claims to being a deity, and no god-like powers would be
needed
> to duplicate his accomplishments. It's all a matter of attitude. N111EU
> was built light, and incorporates drag reducing modifications beyond the
> factory's speed kit, but any mortal builder could duplicate what Kim has
> done. His aircraft may be relatively Spartan (emphasis on relatively,
> because it is certainly not austere) compared to, for example, Dennis
> Vories' XS (whose interior could be compared to a Lexus) but that's
> essential to keeping it light. Since the proverbial free lunch still does
> not exist, each of us must choose to build light and go fast, or build
plush
> and sacrifice speed. Just because most builders seem to prefer to have a
> little more of the plush stuff that adds weight and decreases speed is no
> reason to exclude N111EU as a valid example of the Europa's performance.
>
>
> Best regards,
>
> Rob Housman
> A070
>
> ----- Original Message -----
> From: "LTS" <lts@avnet.co.uk>
> <europa@avnet.co.uk>
> Subject: Re: Realalistic airspeeds
>
>
> > I don't think looking at the performance of Kim Prout's aircraft is
> > particularly helpful, unless you're a god. Nobody else seems to have
come
> > near to the performance acheieved by Kim!!!!! I think this guy wants to
> know
> > what he can expect to acheive if he buys or builds a regular 914 Europa
> Tri
> > gear. There are several out there and we have sold props for at least
two
> > 914 trikes and one 914 mono. I am sure someone can give him typical
> actuals.
> >
> > Jerry
> >
> > LTS@avnet.co.uk
> > www.avnet.co.uk/touchdown
> > ----- Original Message -----
> > From: "Larry Graves" <larry@aircraftersllc.com>
> > Subject: Re: Realalistic airspeeds
> >
> >
> > > Although not a tri-gear, nor turbocharged, there is an excellent
> > performance
> > > evaluation of Kim Prout's Europa Classic at the following URL,
requiring
> > > Adobe Acrobat to open and read:
> > >
> > > http://www.cafefoundation.org/aprs/Europa%20APR.pdf
> > >
> > > Best Regards,
> > >
> > > Larry Graves
> > > AirCrafters Builder Assistance Center
> > > 140 Aviation Way, Watsonville, CA 95076
> > > Tel: 831-722-9141 Fax: 831-722-9142
> > > Website: www.AirCraftersLLC.com
> > >
> > > ----- Original Message -----
> > > From: "Karp" <karp@montrose.net>
> > > Subject: Realalistic airspeeds
> > >
> > >
> > > Hi Everyone,
> > > I am an experienced pilot who lives in the SW part of the United
States.
> > > I am very seriously looking at either Building or buying a completed
> > Europa.
> > > I am leaning towards the tri gear configuration.
> > > I would prefer to use the turbo 914 version from Rotax, being that
most
> of
> > > my flying would be around the mountains in the SW part of the US.
> > >
> > > If anyone on this list could give me some actual Airspeed and fuel
> > > consumption numbers, other then the factory printed information, it
> would
> > be
> > > greatly appreciated.
> > >
> > > Thank you,
> > > Stan
> > >
> > >
> >
> >
> >
> >
>
>
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