Okay, because this is a "discussion question", I am assuming that a KR
builder who is not yet a pilot can chime in.... note that I do have a
small amount of, non-aeronautical, engineering experience.
Note that the (basic/general) purpose of the horizontal stabilizer is to
keep the primary airfoil at the proper angle of attack based on other
forces being applied... this is why it has a "negative" lift profile. As
the aircraft gains speed during take off, and the primary airfoil (wing)
begins to generate lift, it applies sufficient force to "rotate" the
fuselage towards the horizontal.... fortunately, this speed is generally
sufficient to make the horizontal stabilizer/elevator effective so the
pilot can 'choose' when to move the angle of attack of the primary
airfoil so that the aircraft will "fly".
Note that if you recall your experience as a youngster, when you held
your hand out the window in the car to emulate flight, the forces
involve tried to force the front of your hand down and you had to
control the plane of "flight" by rotating your wrist to continue to
generate "lift". Might be a similar principal in play.
Again, just a non-pilot's engineering "gut" opinion. Keep the shiny side
up!!!! :)
Mark W
N952MW (res).
On 7/19/2022 8:40 AM, Flesner via KRnet wrote:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
As we have been discussing CG and tail weight I have a discussion
question for netters. "What is the primary force acting on your
conventional geared KR that raises the tail on takeoff". All opinions
welcome but only one right answer.
Larry Flesner
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