Click for further in formation in the same page.
You are my
th visitor, thanks !!
since 13th may 2000, when the counter last broke...
I am a student, then there is still
some articles for french reader only, excuse me...
- The Paoli wing.
It is a pure flying wing, without any
fin. Simple as it may seem, it works well, and the building is really
- Titine : a bungee
Here is a small flying wing, launched
with bungee, that flies on a soccer area field.
- The NicAile : a
performance flying wing, designed par Nicolas Quendez
During a training period at ONERA (french
research center for aeronautics), Nicolas quendez
studied aerodynamics optimisation applied to flying wings.
He defined some design rules concerning thoise tailless aircraft, that
practically verified through the building of the NicAile.
We both built a NicAile, and I felt in
love with the conccept.
- The Minus-Kiool MAV
This is not really a flying wing, but it
Here is presented the MAV we design in a
student team for the first MAV contest.
The result is a really Tiny
aircraft, whose weight is only 56gm with a camera onboard.
- Docs about flying wings.
I propose you some books dealing with
- Airfoils to be used on
Many flying wings airfoils does exist,
but they are not all as much well known
- My links about flying wings :
- A flying wing bible, the page Nurflugel is to consult without
- You want to know everything about flying wings on the
web ? The TWITT page (The Wing Is The
Thing) is the answer !
Links all around the world, articles and news are regularly updated.
- Everything about flying wing from Germany : see Toni
Bäuerle's page !
- From germany too, calculations and tips on flying wings
: see Aerodesign.de.
- Plans and articles from germany once again : Das
- The page of Martin Hepperle,
designer of MH airfoils, describes us the theory of flying wings.
- Andy Macdonald's flying wing page
: a lot of models, and many links.
- The page of Christophe LAUVERJAT, in french,
some of the main flying wings existing, for modelers and real one.
- Do you know the french flying wing builder Charles
- The famous performance flying wing, the SB-13, is widely exposed.
- Do you know the depron foamies ? L'aile ixir is one of them.
F3i : towed
F3i is a FAI rule for sailplanes with
span larger than 3500mm, that uses aerotowing to start. It is a "speed
- duration" event.
For me it's a project at school, too.
- Building Jade
Come to discover scale
Including : a list of 3-views drawing
and other docs, some unusual subjects, links...
- My ASK-13.
- A logo for
- Do you have
ever hear about Scimitar sailplanes ?
- The PW-5, world
- Links - Best
of sites for the scale sailplane addict...
- La Sitelle (the
I have designed my first electrical
powered glider. The building is quite simple and wholly inexpensive,
and the flight is efficient. Come and see !!
- Excepting the description of this glider, some tips
concerning electric flight are displayed.
Hang and cliff gliding.
I am from Normandy in France, and this
countryside is not famous for its sun and nice wether. Whereas there is
nice cliffs here, that are really flyable !
- The Excalibur.
We design a simple and cheap hang glider
in our club. It intends to fly
well and easily over our cliffs, and need to be very robust to land
safely on small places.
It is also able to fly thermics, thanks to removable wing tip.
I had already built a Slider and a
personnal model(Mostiko, plan encarté RCM n°190).
here is a large HLG,
for calm days at the slope.
It is here displayed ready to fly.
It can really fly into small and weak thermals, but it is quite lazy to
For checking the accuracy of my Excel
polar calculator, I computed
polar and L/D
ratio according to speed for this HLG, with S4083 airfoil. It
is quite realistic, even if a little bit optimistic.
2.Tips and technic
Kite towing : a windy
Have you ever tow a glider with
a kite ?
When two hobbies join together, you can
do interesting things.
You want to know more about this ?
Only one answer : read the page
This untranslatable term hides a simple
device which will allow you to trim your sailplanes more easily.
"Mean Aerodynamic Chord"
Programmed by Jean-Claude Etiemble, this
small soft will make your modelers life easier.
It computes for you the mean aerodynamic chord and the CG for wing with
up to 5 panels !
Both in metric and non-metric system.
genuine airfoil plotter
The state of the art, by Jean-Claude
This soft plots every *.dat airfoil, and
draws spar, leading edge and other features on the ribs.
It also plots template for foam cutting. It worths at least
"compufoil", but it is far cheaper !
NEW : buy tracfoil license online to
its author !
3.Aerodynamics / Flight mechanic
MIAReX, a program for
multi-airfoil wing calculation
Here is a very useful and interesting program, that compute
polar for multi-airfoil wing. The calculation method used is based on
lifting line theory, généralised to non linear
behaviour of airfoil section.
Flight dynamics :
eigen modes location.
AVL from Harold Youngreen & Mark Drela is an
aerodynamic (VLM) tool, but it also computes rigid eigen mode of a
A pair of models of glider were evaluated through this tools, allowing
to get some knowledge about what can be hoped, eigen mode speaking, for
a sailplane model.
Aerodynamic tuning of
a Nimbus 4D model.
I got my Nimbus as a second
owner, but I was really disappointed not to fly and trim it
properly at the first place.
I did some deep investigation, that leads
to some aerodynamic improvement.
this was successful since now it flies much better !
Xfoil is a code that allows calculation
with viscosity effects. Then the
polars are quite accurate for models aifoils.
Here are some result for different Re
F3I airfoils :
Typical F3B airfoils
Marcel Guwang's airfoils (F3F, 60 inches) :
- My airfoils :
||f3i, f3b, f3f with flaps
||f3i, f3b, f3f with flaps
||Scale sailplane (root)
||Scale sailplane (tip)
Olivier Bordes also plots
some polars, for
Speed flight : F3i,
F3b or F3f.
I made some calculation about
speed flight in glider event. At first according to energetical ideas,
did not fit really well. And then I studied Helmu Quabeck's book : "Design,
Leistung und Dynamic von Segelflugmodellen".
I took his ideas for the calculation, and I add some personnals ideas
It seems to give pretty close accurate
results, at least for F3i.
This is summed up into an excel sheet (in
french curently). Some parameters are taken into accompt :
- Sailplane : weight, Cd, Cl max, area.
- The flight path, to be set by user.
- Some external parameter : temperature, pressure, lift
(thermal or hang) (in project : parallelism problem according to ideal
air moisture, wind).
Here is display the calculation that
allowed to build this sheet (in french at the moment).
As usually, there are some restriction to calculation.
Hopefully those choosen are quite
accurate, but don't forget to keep CRITICAL in front of strange result.
DSing is quite widespread
today. It is an extraordiar way to fly faster and faster. It is even
quite magique, and I wanted to know from where all this energy comes.
So I made an excel sheet (once again...)
to compute this, and to understand
what are the main parameters for DSing. I had to make some
simplification, but you can have an idea
of the ideal path according to the glider and the wind.
Main hypothesys are :
- The pilot flies in such a way that the flight path is a
- Wind is zero under a separation line, and is parallele to
it over this line.
So the frontier between calm and windy areas is infinitely thin.
- Ground speed is continuous (mathematically speaking)
- Only wind gust is considered, not lift due to rising air.
Also some interesting links on DS :
Here at SUPAERO school, I am
calculate many things on plane. So I
apply this to all what worries me, and I make some excel sheets.
You have to keep aware that all those calculations have an "area of
accuracy". Don't forget to read instructions.
- Calculation of
I is quite simple to calculate lift, but
drag is much moire difficult.
Here is displayed some evalutation of Cd for sailplane, giving an idea
of glider's polar.
- Roll speed :
You can compare roll speed for a wing of a fixed area, in relation to
aspect ratio, for full span or classic rudder.
- Reverse polar speed to Cz-Cx:
One can easily find on Internet speed polar for full size sailplanes,
which give Vz according to
speed V. But seldom one finds the polar giving Cz according to Cx.
Thanks to this small sheet, you will be
able, while re-entering 10 points
on the speed polar, to very quickly obtain the Cz and the Cx of this
- That's all, folks (for the moment) !!!
Here are some adresses displying free CFD
3-language gliding terms vocabulary
Rather than a genuine dictionary, here
is displayed a short vocabulary. Terms are given from
english, to french and german, according to different topics.
Some pages I
surf on... Let me know wether they interest you as much as me ...