I measured the horizontal stabilitor and found that it was 1.5* NOSE UP
when the airframe is level. Are all Rebels built that way, or was mine
put together wrong?
On 8/22/2010 8:39 PM, skidaddy20000@hotmail.com wrote to rebel-builders-
d:
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-> This topic has had me thinking. I've summarized my thoughts below
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-> and toss them out for consideration and comment.
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->
->
-> 1) There must be some angle between the horizontal stabilizer and the
elevator
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-> at which the air flow separates from the under surface of the elevator.
Like when a wing stalls.
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->
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-> 2) When the air flow separates there must be a significant decrease in the
downward "lift" generated
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-> by the horizontal stabilizer/elevator assembly.
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->
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-> 3) If it happens in flight, this will cause the nose to pitch down and the
angle of attack of the
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-> wings will decrease dramatically.
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->
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-> 4) This change in the angle of attack of the wings will cause a sudden loss
of lift, and altitude, unless the
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-> airspeed is immediately increased to compensate.
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->
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-> 5) If in slow flight, close to the ground, as in landing, the plane may drop
in heavily.
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->
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-> 6) We should know that angle, and set our control stops so it cannot be
exceded.
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->
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-> 7) Vortex generators may increase the angle by a few degrees but there
will still be a finite point
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-> beyond which further elevating the elevator will result in less nose up
force rather than more.
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->
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-> Any thoughts?
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->
-> John
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-> Toronto
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->
->
-> PS One last thought:
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My Rebel gets 32 degrees up elevator. I wonder if the reason for its beautiful, easily controlled stall
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-> is that the wings don't actually stall, the tail does. This drops the nose, I
push the stick forward, re-establishing
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-> attached airflow over the tail, and fly on, thinking wow, only lost 50 feet,
and no wing drop.
->
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