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ACRO E-mail Archive Thread: [IAC-L:1535] Re: Cross-Box Immelman

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ACRO E-mail Archive Thread: [IAC-L:1535] Re: Cross-Box Immelman


Thread: [IAC-L:1535] Re: Cross-Box Immelman

Message: [IAC-L:1535] Re: Cross-Box Immelman

Follow-Up To: ACRO Email list (for List Members only)

From: ACCassidy at

Date: Fri, 24 Oct 1997 09:00:47 UTC


 In a message dated 21-Oct-97 13:43:14 BST, jim Klick wrote:

<< A "Y" axis immelman? Can any judges tell me how they will score that?
 I want to start flying it to get the best score, not necessarily according
 to the Red Book. >>

1.  Pull up straight, wings level.

2.  Keep perfect heading during the roll.

3.  Be exactly in center box, so the judges see you head on.

4.  If you finish the roll heading toward the judges, a little bit of sink
will not be very noticeable, so you can finish with the nose a little lower
if you need acceleration.  If you finish the roll going away from the judges,
it will look like you are settling slightly even if you are flying level.  So
you need a bit higher nose position than when viewed side-on.

Judges will take off points for any time you are not wings level in the
pull-up or after the roll, if you go off heading or barrel the roll (which
they'll see more easily from this viewpoint), or if you have a noticeable (to
them) climb or sink after the roll.  They willhave plenty of opportunities
for downgrades, even if they can't really judge how round the half loop is.

The again, if you have a strong wind down the main axis, the figure is going
to drift downwind.  My interpretation of the rules is that this should not be
downgraded, but the real clever pilot will slip the loop into wind (aileron
into wind and opposite rudder) during the pull-up to keep it looking
straight.  You can have hours of fun and frustration working on this one.
 Its good for a Known sequence as it will still present challenges later in
the season after lots of contests.

And remember, you don't get good scores just because you fly accurately, you
don't get good scores because the judges see you flying accurately, you ONLY
get good scores if the judges THINK they see you flying accurately.

Alan Cassidy


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