Re: an interesting question. Please answer. Thanks.

gatt wrote:
"Dudley Henriques" <dhenriques@xxxxxxx> wrote in message news:WeSdnSLT7Yh6uybanZ2dnUVZ_vyinZ2d@xxxxxxxxxx
gatt wrote:
"Little Endian" <girish.pai@xxxxxxxxx> wrote in message

Bob uses the one roll maneuver where this is possible; it's a barrel roll; a 3 dimensional maneuver through 3 dimensional space. By keeping positive g on the airplane AND the controls perfectly coordinated with no slip or skid as the roll is flown, it is possible to keep the water (or tea in Bob's case) inside the glass on the glare shield.

Is that very hard for an aerobatic pilot to do in an airplane like a Commander? You can't judge the difficulty of something by watching Hoover 'cause he makes it all look trivial.




Barrel rolls are extremely easy to do. The Shrike obviously can perform one quite easily. If executed correctly, the roll is done with a steady positive g on the airplane throughout the maneuver. The initial pull from level flight or from a banked attitude lower than the horizon requires more than +1g, and as the roll is initiated above the horizon, the positive g can be varied to produce a tight or a loose roll axis.
In the classic sense, all barrel rolls are performed with a positive g on the airplane. It's this positive g that allows the tea to remain in the glass.
Basically, the way Bob does this roll, he's above 1 g all the way around through the roll recovery.
It's exactly like rolling the airplane around the outside of a coke can starting at the back, going inverted halfway around, then ending at the front of the can back in level flight.
There is a variation of the barrel roll that is used in ACM with fighters where positive g is used to initiate, then the airplane is unloaded to 0 g through the actual roll, then loaded again through the recovery. That is simply an unloaded roll through 3 dimensions and would of course spill the tea all over the cockpit :-)

--
Dudley Henriques
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