Posted by LarryC
IMAC planes are scale models of full size planes, 1/4 scale or larger, although in the beginning level of competition the plane can be smaller.

The above is not true as regarding the size of 1/4 or larger. While many planes are of this size or larger it is not a requirement. In the Basic category any plane can be flown. There is no scale outline requirement. I have seen everything from full blown pattern planes to 35% aerobatic scale models entered in basic and one J-3 Cub.There is a MINIMAC which does limit the size.

From the rules:The IMAC classification of aircraft is comprised of models
using engines of any size.

See the rules here: http://www.mini-iac.com/pages/rules/2002-2004_Rules.pdf

Posted by Shortman
Pattern - pattern is identical to IMAC only the planes they use are not scale and most look weird..

Pattern and IMAC both fly sequences. Pattern sequences are of a purely model type and generally are very smooth in nature of flying. IMAC on the other hand flies sequenced that are patterned after the full scale sequences (IAC >> the "M" is inserted for miniature meaning models). Each year the sequences are changed and most are at least somewhat based on the new season IAC sequences. As far as them looking weird I guess beauty is in the eye of the beholder. Watch a truly skilled pilot smoothly fly through a sequence and it becomes a thing of beauty (at least to me >> maybe not so much if I'm on the sticks <vbg>).

The full scale site is http://www.iac.org/

This information is provided as just that. Not trying to give a difficult time but just to clear things up a bit. I do fly IMAC and plan to try a few pattern contests this year. Hope this helps.

EXCAP232