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ACRO E-mail Archive Thread: [Acro] Re: 2003 proposed Knowns

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ACRO E-mail Archive Thread: [Acro] Re: 2003 proposed Knowns



                


Thread: [Acro] Re: 2003 proposed Knowns

Message: [Acro] Re: 2003 proposed Knowns

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

From: Brian Howard <BK at newattaero.com>

Date: Mon, 12 Aug 2002 20:13:34 UTC


Message:

  Frank,

>           FWIW, looking at the proposed Sportsman 2003 a bit closer.  Aren't
>figures 6, and 8 so similar as to be almost redundant?

To be sure, the initial pull to 45-degrees, half-roll and entrance to the 
looping portion will be flown the same in both figures. The difference, of 
course, is in the exit. In Figure 8 (reverse Half-Cuban), you release the 
back pressure to end the loop at the 5/8th point with lots of energy and 
maintain that energy into the full loop. Figure 6 (Goldfish) requires you 
to maintain the round loop until the 3/4 point (remember the looping 
portion in both figures should be wind-corrected to appear perfectly round 
to the judges), set a nice 45-degree up line for the judges to study, and 
then PUSH out to upright, horizontal flight with low energy. There is NO 
requirement that the two 45-degree lines in Fig. 6 be the same length, so 
you only have to draw the second line long enough to show the judges and to 
achieve the energy level you want for entry into the Split-S (Fig. 7). You 
will need rudder (right for Lycoming, left for Vedenev) as you push to 
horizontal (the slower you are, the more rudder you'll need). Because 
you'll be flying up a 45-degree line (P-factor) and finish slow and 
therefore nose-high at the end of #6, you'll also find maintaining heading 
to be a challenge. In fact, you could be considerably off-heading and not 
even realize it until you pull down for the Split-S. Heading control is 
much less of an issue with #8 because once you come over the top of the 
loop, you have the ground in sight throughout the remainder of the figure.

Timing the initial pull on both figures will be something you must work on 
so you won't go out of the box during the looping portion. Fortunately, 
there are only two figures on each entry line so positioning isn't too 
critical. However, be careful not to initiate #8 too soon or you may have 
trouble fitting #9 and #10 in the box (though any wind will help you with 
that).

Bottom line: yes, the two figures are similar, but hardly redundant. Each 
presents its own challenges and requires slightly different techniques.

Happy practice!

Best regards,


Brian Howard
Chairman, IAC Rules Committee


                


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