Thread
:
Playing around with the pitch phugoid
View Single Post
#
10
July 8th 15, 01:39 AM posted to rec.aviation.soaring
Mike I Green
external usenet poster
Posts: 55
Playing around with the pitch phugoid
On 7/7/2015 1:57 PM,
wrote:
On Tuesday, July 7, 2015 at 4:31:25 PM UTC-4, wrote:
Push aggressively to hold the airspeed; left to its own devices the airspeed will soon decrease rapidly. The glider is in roughly a normal glide attitude (or a bit more nose-down from that) but way above trim speed, so this is not a steady-state situation in any way, shape, or form. Left alone, the nose will rise dramatically as the flight path curves upward, and the airspeed will bleed away to far below trim speed-- you may even get a stall break.
S
I don't think the question can be answered with any degree of confidence if you don't know how the glider will respond hands off. If the CG is aft, it may well diverge and have a bigger change the next cycle due to less stability. If the CG is forward, it may well be damped and be better off left alone.
A very good reason to know the glider well.
Simply saying push seems to mean the writer is more worried about a stall than over speed.
UH
The first thing I used to do is contact the manufacturer and some pilots
I knew and respected and ask ask what is the recommended CG position.
When I was racing our Duo Discus, I would be changing the water in the
tail daily. It made flying a delight rather than fighting the stick
every flight.
MG
--
Mike I Green
Mike I Green
View Public Profile
View message headers
Find all posts by Mike I Green
Find all threads started by Mike I Green