[rebel-builders] Moose maneuvering speed
Posted: Sun Feb 19, 2012 5:21 pm
You could take the 1g gross weight stall speed and use the lift
proportional to speed squared formula to calculate the speed at which
the stall will occur at the max g that you wish to subject the airframe
to. Two times stall speed would be 4 g.
ie if you are below the maneuvering speed it will stall before it will
bend with ailerons neutral. Realistically I'd use a bit lower than that
number to account for control (aileron) deflection in turbulence. 4 g is
a bit lower than the 4.4 limit that is used for some airplane classes
IIRC so twice the stall speed may be a pretty good number.
Not sure but I think I just put the top of the green ASI band on a
number that I pulled out of the operating manual for the Rebel.
There is a very detailed flight test manual for amateur aircraft that a
fellow was selling in Toronto but I can't seem to find my copy right now.
Ken
Ted Waltman wrote:
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proportional to speed squared formula to calculate the speed at which
the stall will occur at the max g that you wish to subject the airframe
to. Two times stall speed would be 4 g.
ie if you are below the maneuvering speed it will stall before it will
bend with ailerons neutral. Realistically I'd use a bit lower than that
number to account for control (aileron) deflection in turbulence. 4 g is
a bit lower than the 4.4 limit that is used for some airplane classes
IIRC so twice the stall speed may be a pretty good number.
Not sure but I think I just put the top of the green ASI band on a
number that I pulled out of the operating manual for the Rebel.
There is a very detailed flight test manual for amateur aircraft that a
fellow was selling in Toronto but I can't seem to find my copy right now.
Ken
Ted Waltman wrote:
How does one determine best maneuvering speed when doing flight tests? I
see that AC 90-89a says (page 34) that it should be estimated at 2 x
estimated stall speed. That's it though, no suggested flight test profile
to fly to determine maneuvering speed. Manufacturer (me/Murphy) can't state
such since there are so many variances out there (wing tips, VG's, droop
leading edge, etc). Suggestions for determining this value?
I'm getting ready to fly soon-but no, not today.
Ted
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