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Wednesday, 01 September 2004 23:23 |
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Interesting dicussion on www.runryder.com
Definition:
Piro Flips with a rotating motion..meaning you would keep
executing the flip at a different point, i.e (12:00, 3:00. 6:00,
9:00, 12:00).
Credit to Augusto (www.)
"A good controlled sustained piroueting flip will
have the rotor disc flipping in the same direction while the
tail pirouettes around the main shaft axis.
Not too many people can do a good sustained piroflip. Most
people piroflip and kind of "catch it" over and
over so the disc is not flipping in the same direction.
Now a chaos is a sustained piroflip where the pilot purposely
and in a controlled manner does a maintained piroflip and
slowly rotates the flipping axis 360 degrees to a full turn
of the flipping axis.
The big deal about this maneuver is that it shows that you
have complete control of the sustained piroflip in any
orientation of the flipping rotation.
I have never seen anyone do a real chaos and Curtis told me
he either saw or performed a good one only once or twice.
Lately I'm practicing piroflipping rolling circles or maybe
simply called piruetting rolling circles as a way to practice
for when I try a real chaos. It will be the same as far as
orientations is concerned but without the translational
movement. Keeping it in a single place while slowly rotating
the direction of the flipping is pretty tough.
Regarding the circle, It's important to understand that in
the pirouetting flip the numbers of pirouettes per flip are
not related or set in stone. You can describe a full flip
while doing say 10 pirouettes or even a ful flip with say 6
pirouettes. Obviously given a certain constant pirouetting
speed the lower the number of pirouettes the faster the
flipping portion of the mainblades disc.
The factor that controls how fast the flipping happens is the
total amount of deflection away fom the center you apply. In
other words the larger the "stirring circle" the
higher the swashplate deflection hence the faster the
flipping rate. Doing very small "stirring circles"
in the cyclic will achieve slowly flipping piroflip that has
a relatively fast pirouetting rate. Conversely applying a
large deflection away from the center i.e. large
"stirring circle" will make it look like a pretty
fast flip with proportionally fast pirouettes.
What I call "piro-cheating" while piroflipping is
when people let it rest for a while while in the horizontal
disc portion of the flip whether it's right side up or
inverted for about two full pirouettes and then continue with
the piroflip. They let it rest a bit and then apply upwards
momentum so that they can do the piroflip while hanging
between upwards pushes. That makes the piroflip a lot easier
but also a lot uglier. Doing a piroflip where the flipping of
the disc has a constant rate of flip is a completely
different animal. It's obvious that there has to be upwards
momentum applied but people need to learn how to make it
happen without stopping the flipping portion to regain
momentum. There's a world of pitch management that happens in
that small amount of time.
Take a look at this clip and notice that the flipping stays
constant and there's no resting time when the disc is
horizontal. Also in this case the deflection circle is small
and as you can see there is a high number of fast pirouettes
for each flip. Notice also how the direction or orientation
of the flipping portion stays somehow constant throughout the
piroflip. The clip is not too good an example but it servers
the purpose of illustrating the mechanisms of what I'm
explaining.
"
Totally agree with Augusto's posts. Work on your timing first
to get the flips so the rotor disk constantly flips in the same
direction. Then you can work on rotating the flipping direction.
Other than increasing cyclic at a particular point to 'shift' the
pirouetting flip or the chaos in a certain direction, I find
thottle/pitch management important to be able to control the
whole manouver. After increasing cyclic of your desired
direction,depending on how far/fast I want to travel, I would
also add a little extra throttle to the flip but in the direction
I want to move. This is more important for when you do
piro-flippin' loops or fly around doing constant piroeutting
flips.
Piroflip and Chaos Practice
Credit to Pete Niotis
"PiroFlip Practice: Keep doing a repeated async
pirouetting loop in the same spot. Make smaller/tighten as
you progress...that's it!
Chaos Practice: A series of very small/tight Async
Pirouetting Loops where each complete little async
pirouetting loop keeps being placed/rotated in a different
location relative to the flight line. For example...spool up
heli side in (nose right for this example), climb to a
comfortable height let's say 10-20 feet and go right into a
tail stand, begin a constant pirouette dropping and forming a
radius within a few decending feet while pirouetting and
begin forming another pirouetting radius travelling to your
right as to make heli ascend knife edge while pirouetting
where now the outside of disc is facing right as you get to
the top, at the top or end of the climb start adding negative
collective while still pirouetting which leads you to the
same spot you started with the exception that now the inside
of disc is facing left side of field and here's where you
would drop to start another tight async pirouetting loop but
you would also add the necessary cyclic inputs to place next
loop at 12:00 or 6:00 position all dependant on which way you
prefer or which way of rotation compliments the flow of your
chaos. Keep in mind that placing each async pirouetting loop
90 degrees from last position will probably not be as good as
placing each 45 degrees from the last position. To simplify
understanding all this...practice these async pirouetting
loops bigger at the beginning and just keep tightening them
up and making them smaller as you progress and you'll soon
have a chaos."null
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