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United States, CT, South Windsor
Joined Aug 2015
91 Posts
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Discussion
IMAS Axial Roll
I'm a newbie in IMAC....
I'm going to my first competition in Basic. How should the axial Roll be done? Can it be a relatively fast roll (easier) or should it be more like a Slow Roll (harder)?? I've never been to a competition, so I don't know how other pilots do the maneuver. Thanks Don |
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hi, and congrats on giving IMAC a shot. The rate of the roll is not judged; what is important is that the rate be constant. That being said, really fast rolls don't look good and may wander at the exit drawing a downgrade, nor should it be a slow roll. Find some moderate rate that presents nicely. especially in basic you will see pilots popping the nose up before the initiating the roll - that's a no no.
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Go to youtube and search on imac. There are videos produced for each class for 2016
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Don,
Each plane has a nice roll rate ("cadence") that looks good and is easy to fly and judge. Faster rates are harder to stop exactly where they should. Slower ones are easier to stop precisely, but harder to do properly. The potential downgrades of the roll are, variation of track/heading (up or down, in or out), variation of roll rate, not being wings level at the start and not ending wings level. Each is subject to 1/2 point deduction per 5 degrees of variation (perfection). When practicing rolls, do them VERY slowly.....1/2 roll at a time. Focus on keeping the track, heading and roll rate consistent. A slow 1/2 roll to inverted, pause and then another slow 1/2 roll to upright. Once you get these down well, then remove the pause and practice the full roll....SLOWLY, taking the whole length of the flying area. In the actual competition use a roll rate that your comfortable with and can maintain and stop precisely. As in anything else, the more you do the better you'll get! |
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If you haven't put your plane through the attached trim chart you really need to. You will be surprised at how much better your plane will fly afterwards.
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Why are the spin and stall turns in the basic sequence a zero?
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United States, AZ, Mesa
Joined Nov 2010
173 Posts
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not being wings level is a downgrade not a zero unless the plane has rolled 90 degrees at the entry. the entry in the video is a bit strange but the zero is because there is no visible autorotation. properly executed the fuse autorotates around the yaw axis and in doing so, the inside wing should be "flying" backwards.
the stall turn is actually a wing over and does not exhibit any pivot |
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Quote:
DKSnyder1 and sutton4211, Please read the Scale Aerobatics Competition Regulations, if you haven't already, to learn the proper way to take deductions for errors in spins and stall turns. http://www.mini-iac.org/portals/0/do...fd4b194293.pdf There is no mention that wings have to fly backwards in spins. There is no requirement that the plane pivot at the top of a stall turn. There are specific deductions for the plane flying over at the top. If you have questions on judging please post them in the "Compete!" forum on the IMAC website. That will be the real answers from certified judging instructors. http://www.mini-iac.org/The-Hangar DK, have fun at your first contest!! ![]() |
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Dean, you might want to do the same. I read the rules before posting and a flyover as it is called in the rules is zeroed. as for the spin, maybe you can explain how an autorotation can be achieved without the inside wing moving backward against the airflow
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Quote:
The Scale Aerobatics rule book allows 4 full wingspans BEFORE a zero is given by a judge. On a 40% airplane with a 10' wingspan this would mean that a pilot would be zeroed after 40 feet of a "fly-over". Wayne |
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United States, AZ, Mesa
Joined Nov 2010
173 Posts
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Quote:
Mike Quote:
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