On 12/14/2020 5:47 PM, brendan palmer via KRnet wrote:
If the belly board opens 80-90 degrees it may actually pitch the nose down
slightly as it mainly applies a drag force.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
OR, at 90 degrees you get a pressure build up ahead of the board and a
low pressure behind the board acting on the fuselage and it causes nose
up. My board (with 1" hole) goes down to 90 degrees and I seem to get a
nose up pitch from the initial deployment till full down. After about
half down I get a noticeable "rumble" from turbulence (drag) the board
is creating that I can feel in my seat and air frame "jitters". I
tested at altitude on the first flight and there is no loss of stability
in control, during turns and other landing maneuvers. If we had a wind
tunnel we could do some testing but for now we can only rely on what
works for others or do our own testing.
Larry Flesner
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