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

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.

Go to youtube and search on imac. There are videos produced for each class for 2016

Be careful about using the videos as execution guides....the iMac 2016 basic spin and stall turn are both zeros.

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!

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.

Originally Posted by FGNewbie

Be careful about using the videos as execution guides....the iMac 2016 basic spin and stall turn are both zeros.

The spin in the sportsman sequence is very close to a zero also. Peter Schmidt and I both need more practice with the spin!

Why are the spin and stall turns in the basic sequence a zero?

Originally Posted by JuStOnE

Don,

not being wings level at the start

What rule is that?

Mike

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

Originally Posted by azcrashpro

What rule is that?

Mike

Justone was referring to the roll not the spin and he said that a down grade is not being wings level... That is a down grade 1/2 point for every 5 degrees not wings level

Originally Posted by FGNewbie

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

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!!

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

Originally Posted by Dean Bird

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!!

I do agree with you, Dean.
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

Originally Posted by Carruthers43

Justone was referring to the roll not the spin and he said that a down grade is not being wings level... That is a down grade 1/2 point for every 5 degrees not wings level

I got that but the way he phrased it is not correct. the deduction is the line before the roll, not the start of the roll. The way he puts it I should deduct 2 points if the entry line was off 20 degrees on the line and another 2 because the wings were not level at the start of the roll. That is not correct.

Mike

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.