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Santa is on his way:     SHG       FatherFrostRussia       WithTwoDeers      Merry Christmas from contributor Neil Larson who after 40 years still has a hand at painting.   [Ed: Thanks for the selections, Neil ! ]

Gust soaring as a basis for the flight of petrels and albatrosses (Procellariiformes) BY  Colin J. Pennycuick   (thanks Steve C.)

Lift  December 2010                                         P2      P3     P4    P5    P6 
... 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 submarine.

Very little pressure is needed to operate a 6-ton car jack! A tiny hydraulic jack on a hang glider would replace the intricate
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.             ~~Neil Larson            2Dec2010

Otto Service Hydraulic Jacks?     ~~ JoeF            2Dec2010                   
CG optimizing?   ~~ JoeF   2Dec2010

Click image for full instruction.