|Oct 25, 2011, 09:33 PM|
Joined Jun 2010
How do you feel that your plane is tailheavy?
Is there any way to "feel" that the plane is tailheavy? My CG is right, but it kinda feels like its a little tail heavy..:P
|Oct 25, 2011, 09:40 PM|
United States, NJ, Manchester
Joined May 2011
If you put your 2 fingers under the COG of the wings you can tell by that. If you are flying and you let of go of the sticks the plane will try and tilt back to climb. Nose heavy > tail heavy
Balancing it perfectly at CoG is what you want.
|Oct 25, 2011, 09:54 PM|
Tail heavy usually flys somewhat to VERY sensitive in pitch axis.
I once put too light a battery in my EZ Star (making it VERY tail heavy) and had about 30 seconds of excitement!
Very difficult to keep the plane level. The tiniest twitch on the elevator had a HUGE effect.
|Oct 26, 2011, 03:06 AM|
2) calculate the CG/MAC
3) age old adage, "nose heavy planes fly fast and poorly (like a brick), tail heavy planes don't fly long"
nose heavy planes:
stall nose down
(in LOS flying) are typically trimmed to fly level at 1/2-WOT, and decend with the AOA decreasing at lower throttle settings
tail heavy planes:
become very sensitive in pitch
can become snap happy at low speeds
when elevator throw is too much at any flying speed, can show a preference to stall one wing & cause a snap
severely tail heavy planes will simply try to backflip as speed decreases
obviously every plane is different, but many standard layout (wing in front, stab in back) mostly straight wing planes balance somewhere around the max thickness of the wing.
|Oct 26, 2011, 07:15 AM|
How to test for correct COG in flight.
!. Get as close to calculated COG as possible.
2 Fly it and trim elevator for level flight at cruise speed. (NOTE: ALL stabilization/gyros OFF)
3. Climb to sufficient altitude for an approx 2-3 second 45 degree dive.
4. Perform 45 degree dive and watch for plane to steepen the dive or begin to pull out without any stick input.
Increasing dive as speed rises = Tail-heavy
Steady 45 degree dive no change with speed = Ideal
Pulling out by itself = Nose heavy.
Hope this helps,
|Oct 26, 2011, 09:14 AM|
Joined Nov 2009
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