A SOURCE OF INFORMATION FOR AEROMODELERS
Try these links if you have an interest in tailless and/or unconventional aircraft:
We've had more fun with our Richter R/C Alula
than man was meant to have with a $45 investment. After flying our
original Alula with full span elevons for some time, we got the idea of
separating the control surfaces into outboard ailerons and inboard
elevator halves. While this modification mandates installation of a
third servo, overall weight can still be kept down to well below five
ounces, and the Alula turns into a real thermal soarer. The Alula2 PDF is about 2.3 MB in size and is a compilation of our three part series published in RC Soaring Digest magazine.
Since the original Alula, Michael Richter has gone on to design and
distribute several RC-DLGs, including the Alula TREK, Weasel TREK, and
the conventional tailed Libelle.
Aircraft Aerodynamics and Design Group, Stanford University
A complex website which includes reports
on the development of the high performance SWIFT tailless rigid-wing
hang glider and highly nonplanar lifting systems, among a multitude of
others, and a complete paper, Design and Analysis of Optimally-loaded Lifting Systems.
Andy MacDonald's Flying Wing Pages
Andy's pages have been up for some time. This is the premier site for information regarding
the models of Hans-Jurgen Unverferth, from CO2 through CO8. There are
pages devoted to vacuum bagging and construction tips, and there's also
a page filled with pictures of various tailless creations from around
the world. Certainly worth a visit!
- BW 05 02 09
- We've used Barnaby Wainfan's BW 05 02 09
airfoil on several projects now, always with great success. This
section has a positive pitching moment and is designed for "plank"
planforms. We've recently increased the number of points and smoothed
the contour using section printouts of 100 inch length. Andre Martins
put the new coordinates through XFoil, smoothing the contour by means
of the pressure distribution, and increasing the number of coordinate
points to 200. The coordinate table for this smoothed section is
available as a text download, and the five relevant pressure distribution plots are available as a PDF document.
Culver twist distribution
A mathematical method of determing wing twist for swept wings. The
resulting twist distribution creates an elliptical lift distribution
across the span. This link includes an explanation of the formula and a
spreadsheet template (Excel and Appleworks) written by Aaron Coffey.
Coordinates and basic aerodynamic data for the EH series of airfoils
are on this web site. The EH airfoils were developed by John Yost for
swept wing tailless aircraft. With near zero pitching moments and
excellent stall characteristics, the EH airfoils are highly recommended
for "flying wing" applications. Polars for the EH sections, as well as
the Eppler E182, E184, and E186, and the Selig S5010 and S5020 are
available through the UIUC Airfoil Coordinates Database.
A number of European, primarily German, sites devoted to tailless RC Sailplanes:
- Hartmut Seigmann's web site
- Robert Schweissgut's web site
- The NurfluegelTeam web site
- Reinhard Seilemann's web site
- The Zanonia Flyers' web site
- The Swiss Nurfluegel web site
- Web pages not available in English can be translated through use of any of the translation services available on the 'net.
Martin Hepperle's Model Aircraft Home Page
Martin Hepperle is the designer of the MH airfoils. This site includes
coordinates and polars for MH sections designed for tailless aircraft,
conventional sailplanes, and pylon
racing. Martin has also included a number of comprehensive articles on
this web site. Of interest to tailless enthusiasts is Basic Design of
Flying Wing Models.
Serge Krauss' "Tailless Bibliography"
Serge Krauss has announced a limited edition of his extensive
bibliography for subsonic tailless aircraft. This bibliography is an
excellent source of information, and can serve as either a standalone
reference or as a database for research. Further information can be
found on the tailless bibliography page.
Jim Marske home page
Descriptions of available kits (Monarch and Pioneer), the workshop
schedule, and articles are all part of the new Jim Marske site. There's
even a discussion group!
Steve Morris materials
- Steve Morris, instrumental in the design of the S.W.I.F.T. rigid
wing hang glider, flew an actively controlled unstable flying wing in
1987. This web page describes The Palo Alto Shipping Co. project in
some detail, complete with illustrations and links to GIF images of the
viewgraphs used inthe NASA presentation. The page also has a photo of
Steve's variable sweep oblique wing demonstrator and links to a couple
of other photos of the aircraft.
The Nurflugel Pages
- A site focused on full size tailless designs. Separate pages
devoted to Horten (includes a couple of theoretical papers translated
from the original German), Northrop and Lippisch. This is a growing
site, well worth a visit if you are interested in tailless aircraft
history and development.
Panknin Twist Formula
A mathematical method of determing wing twist (washout) for swept wing
tailless planforms. This link includes an explanation of the formula,
QuickBASIC programs for both Macintosh and IBM-compatible computers,
and an Excel spreadsheet template written by Joa Harrison. And Glyn
Fonteneau has added a winglet design function to Joa's template. The
applications contain functions to determine CG location and other
essential planform data, in addition to required geometric wing twist.
TWITT, The Wing Is The Thing
TWITT is a non-profit organization whose membership seeks to promote
the research and development of flying wings and other tailless
aircraft by providing a forum for the exchange of ideas and experiences
on an international basis.
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