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Old 06-08-2017, 02:24 PM
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Here is the Basic Call sheet I hand out when someone asks about IMAC.

I would say that a good caller experience on your first time out can make a world of difference. Calling the manueuver, describing the maneuver, helping with little corrections and helping the pilot stay out of trouble.
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Old 06-08-2017, 03:02 PM
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I like that call sheet.

I dont like the "270 degree" i prefer 5/8 loop but that is preference .

The good thing about that is you put in enough criteria information in there without boring or bogging down the sheet.
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Old 06-08-2017, 03:11 PM
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A 270 degree loop.will drive you straight into the ground. A 5\8 loop is 225 degrees.
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Old 06-08-2017, 03:16 PM
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Quote:
Originally Posted by FGNewbie View Post
I've said this before...an immelman is a specific figure not a generic term for an half loop with roll elements. Calling an immelman and then describing something else can earn zeros.....
In my last contest I had a very experienced unlimited/invitation caller calling for me off of the generic aresti sequence no notes. He called the 3rd intermediate maneuver (half roll push half loop, 2 half rolls at the top) as a half roll entry immelman with 2 half rolls a the top. This was perfect for me, and the same as I call it. For this same reason I call a half cuban a half cuban, regardless of what elements are on the entry or down line, same with the reverse half cuban.

To me this is analogous to calling a cotton swab a Q-tip, and facial tissue, kleenex. I personally wouldn't/don't discourage people from calling a maneuver (on their own call sheet) whatever helps them remember it! When I was in basic, my caller and I always referred to a tear drop as an ice-cream cone because that's what worked for us.

That said to each their own.

A.J.
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Old 06-08-2017, 03:42 PM
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I actually know two Unlimited pilots who call Family 1.3.x (Three Lines in Aresti... usually referred to as "Bowtie") ....They call them "Fish Tail. And in addition, they call Family 7.3.x (3/4 Loops in Aresti... usually referred to as "Goldfish")... They call them "Fish Head".

THEY understand exactly what needs to be done when they call for each other.

Kinda funny what some pilots call these maneuvers.
W
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Old 06-09-2017, 10:40 PM
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Quote:
Originally Posted by wmat7039 View Post
I actually know two Unlimited pilots who call Family 1.3.x (Three Lines in Aresti... usually referred to as "Bowtie") ....They call them "Fish Tail. And in addition, they call Family 7.3.x (3/4 Loops in Aresti... usually referred to as "Goldfish")... They call them "Fish Head".

THEY understand exactly what needs to be done when they call for each other.

Kinda funny what some pilots call these maneuvers.
W
Don't forget the "Jamaican Eight"
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Old 06-10-2017, 05:22 AM
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or the dreaded 0 of 8!
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Old 06-21-2017, 09:17 AM
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Hi
I am a big fan of the scale racing biplanes such as the Mung Sport (Hostetler plans full tilt boogie)
Are these planes legal for upper classes as long as they are within 10% of scale?
Thanks
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Old 06-21-2017, 09:49 AM
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Straight from the Rule Book

Quote:
3.1.
The events accommodate aerobatic monoplanes and biplanes which are
replicas of types known to have competed in International Aerobatic Club
(IAC) competition, or replicas of types known to be capable of aerobatic
competition within the airspace known as the “Box.”
and

Quote:
6. Proof of Scale
6.1.
To prove that the model resembles a particular aircraft some proof of scale
is required.
6.2.
Proof of scale is the responsibility of the contestant.
6.3.
The general outlines of the model shall approximate the full size outlines
of the subject aircraft. Exact scale is not required. The model shall be
judged for likeness at a distance of approximately 10 feet.
Academy of Model Aeronautics
Competition Regulations | Radio Control Scale Aerobatics 4
6.4.
If the contestant presents no proof of scale material with the model, and
the CD can determine that the aircraft is a replica of a full-size aircraft,
then the contestant will be allowed to have his/her entry considered.
6.5.
Scale shall be determined by the wingspan. A change in wingspan will
become a change in overall Scale. Fuselage width, height and aircraft
planform or any other variations shall not exceed 10% of scale, with the
exception of airfoils and size/shape of control surface within the scale
outline rule.
I am not familiar with that plane. In basic you can fly anything. In the upper classes you must follow the rules I have quoted above.
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Old 06-21-2017, 11:41 AM
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I read this also, the phrase "known to be capable of aerobatic competition" gives a lot to the interpretation of the contest director. I think I will just build a Pitts then there will be no question.
Thanks
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Old 06-21-2017, 12:36 PM
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the scale requirement is a bit flexible. IMAC was flooded with Edge 540Ts before the real one had even flown.
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Old 07-11-2017, 06:31 AM
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Judging chair question?? Corollary

This is a question for everyone and anyone who has ever sat in the judging chair and yes, you guessed right, I am about to ask the question, again, about a snap???


OK

from a judge's perspective?

1st lets refresh everyone as to the IMAC definition of a snap:


8.9.3: Family 9.9: Snap Rolls (“Flick Rolls).
Snap rolls may be positive (pitch to the canopy) or negative (pitch to the wheels). Other than this difference, all judging criteria are the same for either type of snap.
Snap rolls are difficult to judge due to the speed of the snaps and
the variation in the manner in which different aircraft perform snaps. However, two things must
be present in order that a judge can decide that a snap roll has occurred. They are:

1. The nose must pitch in the correct direction as indicated by the ARESTI figure

2. Autorotation must be initiated.


Given the high energy nature of the snap, it is very difficult to tell if these two items are occurring simultaneously or sequentially. Therefore, there is no requirement that these two movements start simultaneously. They may occur simultaneously or sequentially in the order presented.


From a judging perspective, if you see the pitch departure in the correct direction, then one more requirement is the auto-rotation. Would it be safe to say, a corollary is, since it occurs so fast, that if you do not see a roll, then it is a snap?

meaning, if I set in my mind to look for "do I see a roll or not"
would this be a safe way to be able to look at it?

to Zero the snap,
you would have to be certain that:
1. No pitch departure in the proper direction
2. No pitch departure (in which case, the airplane would roll and not auto-rotate)
3. stopping the auto-rotation 90 degrees shy of where it should have stopped
4. If a line is drawn between pitch departure and then auto-rotation (delay), then a zero
5. no autorotation was done? When does a snap turn into a barrel roll?
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Old 07-11-2017, 06:45 AM
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Quote:
Originally Posted by orthobird View Post
5. no autorotation was done? When does a snap turn into a barrel roll?
When it looks like a barrel roll and not a snap. (wing not stalled, no acceleration)

Another hard zero is when yaw is in the opposite direction of roll i.e. a shoulder snap.
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Last edited by kwilson; 07-11-2017 at 06:50 AM. Reason: clarification
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Old 07-11-2017, 06:48 AM
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I have also seen many snaps where there is yaw and roll, but no pitch departure. These can be deceiving because they look snappy, but no elevator is applied. A key to look for in a positive upright snap is altitude loss. A properly performed snap will usually gain a little altitude, whereas one with no pitch departure will actually finish on a lower line that it started.
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Old 07-11-2017, 06:54 AM
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Quote:
Originally Posted by kwilson View Post
I have also seen many snaps where there is yaw and roll, but no pitch departure. These can be deceiving because they look snappy, but no elevator is applied. A key to look for in a positive upright snap is altitude loss. A properly performed snap will usually gain a little altitude, whereas one with no pitch departure will actually finish on a lower line that it started.
excellent, thank you! please keep them coming. Little clues like this help.
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