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1. 05:35 PM - Re: Re: of interest (Bud Yerly)
2. 06:45 PM - Re: Re: of interest (Pete)
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Chris,
Getting the leading edge profiled correctly was a bit of a problem in the C
lassic foam wing. It comes down to a good long block and a root and tip te
mplate and of course a good eye. Technique on rolling the leading edge by
rolling off the edge at a 45 gives a uniform leading edge. The XS is out o
f the mold pretty good. Though I=92ve seen wings built on saw horses that
were a bit wonky, but trimmed out OK. Good flat tables are the best wing s
kin gluing jig.
Attached is my LSA vortex generator testing I did for the Europa LSA. Spea
ks for itself. I like these Aussie VGs. Great results after moving them a
round the plane was acceptable as an LSA or for STOL ops.
Weight, CG, and wing smoothness are all essential for efficient cruising, b
ut so is cooling drag. Pay attention to sealing your cooling duct gaps. S
ee my Cooling discussions on my website. It is nice to get the benefit of
an increase in speed and cool better. Most of the drag on a light airplane
is cooling drag so make sure you follow the rule. Think like an air molec
ule that is pretending to be a naughty teenager looking to get out of work.
If there is a gap to escape work, they will rush to go through it, result
ing in low productivity, and drag. See www.customflightcreations.com<http:
//www.customflightcreations.com> for some of the other building and flying
articles.
Since the Europa wing is very well designed and up to 1450 pounds, has a re
asonable laminar flow and nearly perfect elliptic wing lift distribution, s
o aerodynamic gimmicks like wing fences, winglets, and VGs. I have not fou
nd it necessary to fly with the wings in the raw or just primed and sealed.
The stall of the Europa is slightly less abrupt than a typical series 6 a
irfoil due to excellent leading edge contour. The best stall taming is wit
h the POH recommended stall strips as it adds great pre-stall warning feel
prior to the actual break. You will find modifying the wing shape to impro
ve flow will be an exercise yielding nothing. I=92ve done tuft tests, and
the wing tends to have a nice span wise root to tip stall progression provi
ding the wings are built the same and square of course. The stall of an un
modified wing begins separation at the root, the downwash over the stab dec
reases, the nose drops and the root begins to fly, then the nose rises and
it repeats. (See stall on youtube: Europa 159HR Flight.) The POH stall str
ip allows a complete aft stick stall in most aircraft with the stick full b
ack and a gentle nose down rumble and shake. Don=92t let the nose wader as
it will rumble off opposite to the ball. Flaps down depends on the flap r
igging. The rumble begins only just prior to the stall and the nose drops
like any other large flapped conventional tractor aircraft. Adding VGs mad
e for an aircraft with excellent control but it sank like a rock at 40 KTS
with no low speed warning. Like Buzz Lightyear, I was, =93Falling With St
yle=94.
Many pilots have never flown a light aircraft with the center of mass so ne
ar the CG, so a little rudder, P factor, or a droopy flap really affects th
e yaw/roll in the Europa. Case in point, the nose is really pulled to the
left just at the stall break even at idle power! This results in a left wi
ng drop as one would expect. The stall strips give excellent feel approach
ing a clean stall power on or off.
Watch out for that old, I think I can make it better, which I found added w
eight, build time, and tweaking. Keep it light, maintenance accessible, an
d smooth, and you will be rewarded.
Get the family into the build, but don=92t be Captain Bligh, let them have
fun and help (well for an hour or two when you need an extra set of hands).
Remember, =93Ain=92t nobody happy unless Momma is happy=94!
Best Regards,
Bud Yerly
Custom Flight Creations, Inc.
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Window
s 10
________________________________
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of n7188u <chmgarb@gmail.com>
Sent: Tuesday, August 13, 2019 12:06:26 PM
Subject: Europa-List: Re: of interest
Good points Graham and will probably do the items you mention.
I am planning to paint only stabs, ailerons and maybe flaps white so I can
balance before first flight and not worry afterwards if I paint the whole p
lane. The rest will be primer and thin coat of sealer. This was a Lancair b
uilder center did with their planes (Evolutions) we had here at our field.
I used to fly a longEZ with VGs and it flew nice but I kept breaking them w
hen I handled the plane or cleaned it so my current one has none (and a GU
canard!). But my EZ flies great, very docile and the canard stalls at 58 kn
ts so no complains. yes, it will pitch down in rain (or not take off in rai
n and heavy) but I don't fly in rain often.
Regarding the wing LE, how can you ensure it has the correct profile? Are t
here coordinates for this airfoil? Even with the coordinates it sounds that
it would be challenging to ensure the entire span is accurate or do you ch
eck at some discrete span points and then ensure the thing is fairly smooth
in between?
Regards,
Chris.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=490843#490843
Message 2
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Great write-up Bud...... how does the XS do in heavier rain?
> On Aug 14, 2019, at 8:32 PM, Bud Yerly <budyerly@msn.com> wrote:
>
> Chris,
> Getting the leading edge profiled correctly was a bit of a problem in the C
lassic foam wing. It comes down to a good long block and a root and tip tem
plate and of course a good eye. Technique on rolling the leading edge by ro
lling off the edge at a 45 gives a uniform leading edge. The XS is out of t
he mold pretty good. Though I=99ve seen wings built on saw horses tha
t were a bit wonky, but trimmed out OK. Good flat tables are the best wing s
kin gluing jig.
>
> Attached is my LSA vortex generator testing I did for the Europa LSA. Spe
aks for itself. I like these Aussie VGs. Great results after moving them a
round the plane was acceptable as an LSA or for STOL ops.
>
> Weight, CG, and wing smoothness are all essential for efficient cruising, b
ut so is cooling drag. Pay attention to sealing your cooling duct gaps. Se
e my Cooling discussions on my website. It is nice to get the benefit of an
increase in speed and cool better. Most of the drag on a light airplane is
cooling drag so make sure you follow the rule. Think like an air molecule t
hat is pretending to be a naughty teenager looking to get out of work. If t
here is a gap to escape work, they will rush to go through it, resulting in l
ow productivity, and drag. See www.customflightcreations.com for some of th
e other building and flying articles.
>
> Since the Europa wing is very well designed and up to 1450 pounds, has a r
easonable laminar flow and nearly perfect elliptic wing lift distribution, s
o aerodynamic gimmicks like wing fences, winglets, and VGs. I have not foun
d it necessary to fly with the wings in the raw or just primed and sealed. T
he stall of the Europa is slightly less abrupt than a typical series 6 airfo
il due to excellent leading edge contour. The best stall taming is with the
POH recommended stall strips as it adds great pre-stall warning feel prior t
o the actual break. You will find modifying the wing shape to improve flow w
ill be an exercise yielding nothing. I=99ve done tuft tests, and the w
ing tends to have a nice span wise root to tip stall progression providing t
he wings are built the same and square of course. The stall of an unmodifie
d wing begins separation at the root, the downwash over the stab decreases, t
he nose drops and the root begins to fly, then the nose rises and it repeats
. (See stall on youtube: Europa 159HR Flight.) The POH stall strip allows a
complete aft stick stall in most aircraft with the stick full back and a ge
ntle nose down rumble and shake. Don=99t let the nose wader as it wil
l rumble off opposite to the ball. Flaps down depends on the flap rigging.
The rumble begins only just prior to the stall and the nose drops like any o
ther large flapped conventional tractor aircraft. Adding VGs made for an ai
rcraft with excellent control but it sank like a rock at 40 KTS with no low s
peed warning. Like Buzz Lightyear, I was, =9CFalling With Style
=9D.
>
> Many pilots have never flown a light aircraft with the center of mass so n
ear the CG, so a little rudder, P factor, or a droopy flap really affects th
e yaw/roll in the Europa. Case in point, the nose is really pulled to the l
eft just at the stall break even at idle power! This results in a left wing
drop as one would expect. The stall strips give excellent feel approaching
a clean stall power on or off.
>
> Watch out for that old, I think I can make it better, which I found added w
eight, build time, and tweaking. Keep it light, maintenance accessible, and
smooth, and you will be rewarded.
>
> Get the family into the build, but don=99t be Captain Bligh, let the
m have fun and help (well for an hour or two when you need an extra set of h
ands). Remember, =9CAin=99t nobody happy unless Momma is happy
=9D!
>
> Best Regards,
>
> Bud Yerly
> Custom Flight Creations, Inc.
>
> Sent from Mail for Windows 10
>
> From: owner-europa-list-server@matronics.com <owner-europa-list-server@mat
ronics.com> on behalf of n7188u <chmgarb@gmail.com>
> Sent: Tuesday, August 13, 2019 12:06:26 PM
> To: europa-list@matronics.com <europa-list@matronics.com>
> Subject: Europa-List: Re: of interest
>
>
> Good points Graham and will probably do the items you mention.
>
> I am planning to paint only stabs, ailerons and maybe flaps white so I can
balance before first flight and not worry afterwards if I paint the whole p
lane. The rest will be primer and thin coat of sealer. This was a Lancair bu
ilder center did with their planes (Evolutions) we had here at our field.
>
> I used to fly a longEZ with VGs and it flew nice but I kept breaking them w
hen I handled the plane or cleaned it so my current one has none (and a GU c
anard!). But my EZ flies great, very docile and the canard stalls at 58 knts
so no complains. yes, it will pitch down in rain (or not take off in rain a
nd heavy) but I don't fly in rain often.
>
> Regarding the wing LE, how can you ensure it has the correct profile? Are t
here coordinates for this airfoil? Even with the coordinates it sounds that i
t would be challenging to ensure the entire span is accurate or do you check
at some discrete span points and then ensure the thing is fairly smooth in b
etween?
>
> Regards,
> Chris.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=490843#490843
>
>
>
>
>
>
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>
> <LSA Europa Flight Test Final.pdf>
> <Vortex Generators for STOL-LSA Mod Version 1.pdf>
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