Santa is on his way:
Christmas from contributor Neil Larson who after 40 years still
hand at painting.
[Ed: Thanks for the selections, Neil ! ]
soaring as a basis for the flight of petrels and albatrosses
(Procellariiformes) BY Colin J. Pennycuick (thanks
Lift December 2010
... builds during the month per send-ins from the hang gliding
world. Send comment on posted items or new topics.
Aeros movable CG announcement:
|Discussion open for
the variable-CG topic:
The elaborate mechanism of cords and block-and-tackle
used to operate the Vari-CG - may one day be replaced with a more
simplified pneumatic/hydraulic compressed-fluid system – perhaps
using the keel tube as a sealed cylinder with fluid loaded and
compressed. A flipper valve could be operated from the pilot's
control bar using a two-way flipper switch; a small amount of motion
from the simple movement of the pilot would be used to lever a tiny
compressor – filling a compression chamber. This pressurized fluid
would then be channeled back and forth--fore-and-aft--through
the main keel tube/compression cylinder, as the fluid can be
harnessed to operate a floor jack, or change the ballast of a
Very little pressure is needed to operate a 6-ton car
jack! A tiny hydraulic jack on a hang glider would replace the
series of ropes, pulleys, and tackle blocks.
The weight difference between a future “Vari-CG“ proposed idea
pneumatic apparatus and the pictured current working array of cords
and pulleys may be very close.
Otto Service Hydraulic Jacks? ~~ JoeF
CG optimizing? ~~ JoeF
Click image for full instruction.
- We are still working on Alex Morillo's joined-wing project coverage.
Lilienthal Glider full-scale flying model contemporary replica
built by Eddie Paul Industries.
Photo is from archive of Neil Larson, hang glider historian.
Francis M. Rogallo, filed instruction: Apr 29, 1963, which was
over a decade and a half after he already was aware of the same in his
earlier filed instructions.
Rogallo concentrating on boosters but realizing much more.
- Instructed in 1946 by
- Some echo from 1887 Beeson into 1946 with Spratt:
Spratt built and flew an echo of the control system that was also evident
in 1908 in Breslau
where was used hung pilot behind triangle control frame as is so common
today in hang gliding
and ultralights; these flying machines use a pivoting of the wing
relative to the the pilot's mass.
The Paresev hung-pilot gliders essentially used the pivoting of the wing
relative to pilot-mass.
http://www.marskeaircraft.com Pultrusion for making hang
Ride Like the Wind (only faster): Sad news in the world of DDWFTTW
- Complete (Historical)
Civil Rotorcraft Register of the USA (N3251 through N5019)
N3785C Bensen Gyroglider
used the TCF with weight-shift control for gliding, with pilot
tensionally hung from the airframe. 1954. The prior use of TCF was
aplenty; and we still use it on many hang gliders today.
Bensen also used the TCF in its morphed format as an inverted T, but
still with same function as the three-part regular TCF, sometimes
formatted as a single roundish device.
Sometimes the three parts of the triangle would be collapsed into a
single stick, but functioning as the 1908 Breslau TCF: See
http://www.tervis.fidisk.fi/firstgyroglider.html for Finland
situation with the TCF as collapsed to a single stick.
Coblitz in ornithopter in Czechoslovakia
Wingsuit Base Jumping
... video selection by roving/contributor Lift
reporter Neil Larson.
- HG lead: biplane joined wing?
Bells biplane circular-decks kite
A-frame for hang gliders to a flexible wing
hang glider with pilot hung from keel behind the A-frame or cable-stayed
control bar was exampled in a gliding club in 1908 in the territory of
Breslau. Photograph of the demonstration is in Stephan Nitsch
collection. That and the Flight magazine of 1910 feature on the
control system involved with the triangle control frame formed part of
the inspiration for others to use the system; indeed the basic TCF was
involved in one way or another in almost all aircraft as it morphed in
various ways as an undercarriage, holder of engines and motors, springs,
skids, etc. Igor Bensen used the hung pilot behind a small
triangle control frame or A-frame in his early 1950s kite-glider. Later
users in the 1960s included Barry Hill Palmer, Mike Burns, and then John
Dickenson and others. Thanks to the pioneers pre-1911, including Beeson,
Pilcher, Wenham and others who gave the foundations for the A-frame
control system most simplified by the Breslau 1908 exampling.