"Matt Whiting" wrote in message
...
john smith wrote:
Dudley, don't misunderstand me.
Hoover (an a limited number of others) are special circumstances.
Everything I have read stated that the Shrike was a stock airplane.
I don't recall that Hoover ever spins in the airplane.
The video of the roll while pouring a glass of water is sure a hoot,
though!
As I said in my post, in the right hands, some maneuvers not approve by
the manufacturer can in fact be performed safely.

I believe that Bob also said at one airshow that he never stressed the
Shrike beyond its certification load limits. As someone said earlier,
it often isn't the aerobatic maneuver itself that stresses the airframe,
it is the botched maneuver or the recovery from a botched maneuver where
the extra strength is needed. Obviously, Mr. Hoover doesn't have to
worry about that. :-)


According to Liefeld, Hoover's Shrike had just two modifications other than
its smoke system. An hydraulic accumulator in the baggage compartment held
hydraulic pressure so Hoover could extend the gear when the airplane was
upside down and the engines feathered. It also provided Hoover with
nosewheel steering following his deadstick landing and rollout.

The second mod was an automatic unfeathering system. Hoover would shut down
the engines by pulling the prop controls to Feather position while leaving
the throttles and mixture controls in place. To restart, he would advance
the prop levers, tripping microswitches on electric pumps that unfeathered
the props so they would windmill and restart.


Matt
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Matthew W. Barrow
Site-Fill Homes, LLC.
Montrose, CO