TURBINE
Any Experimental Category aircraft with a turbine engine, unlimited SHP (Shaft Horse Power). Class winners in both Fixed and Retractable gear.

UNLIMITED
Any Experimental Category aircraft normally aspirated or with a turbo/super-charged (any forced-induction) engine with a displacement greater than 1,000 cubic inches. Class winners in both Fixed and Retractable gear.

SPORT CLASS
Any Experimental Category aircraft with a normally aspirated engine with a displacement of 1,000 cubic inches or less.

SPORT FX
Any Experimental Category aircraft with 540/550 cubic inch displacement normally aspirated with Fixed Landing Gear for F-1, EVO  Rocket, Harmon Rocket II etc.

SPORT FX-T
Any Experimental Category aircraft with 540/550 cubic inch displacement, forced-induction with Fixed Landing Gear for RV-10s, F-1 Rocket, Harmon Rocket II etc.

BIPLANE UNLIMITED
Any aircraft having two main lifting wings, to include a tandem configuration, factory or experimental, with an engine displacement greater than 1,000 cubic inches and can be turbo/super-charged (any forced-induction).

BIPLANE SPORT
Any aircraft having two main lifting wings, to include a tandem configuration, factory or experimental, using a normally aspirated engine with a displacement of 1,000 cubic inches or less.

BIPLANE Blue
Any aircraft having two main lifting wings, to include a tandem configuration, factory or experimental, with an engine displacement of 360 cubic inches or less, normally aspirated.

BIPLANE Red
Any aircraft having two main lifting wings, to include a tandem configuration, factory or experimental, with an engine displacement of 320 cubic inches or less, normally aspirated.

RG Blue
Any Experimental Category aircraft with an engine displacement of 360 cubic inches or less, normally aspirated, with retractable landing gear.

RG-T Blue
Any Experimental Category aircraft with an engine displacement of 360 cubic inches or less, turbo/super-charged (any forced-induction), with retractable landing gear.

RG Red
Any Experimental Category aircraft with an engine displacement of 320 cubic inches or less, normally aspirated, with retractable landing gear.

RG-T Red
Any Experimental Category aircraft with an engine displacement of 320 cubic inches or less, turbo/super-charged (any forced-induction), with retractable landing gear.

FX Blue
Any Experimental Category aircraft with an engine displacement of 360 cubic inches or less, normally aspirated, with at least two fixed landing gear.

FX-T Blue
Any Experimental Category aircraft with an engine displacement of 360 cubic inches or less, turbo/super-charged (any forced-induction), with at least two fixed landing gear.

FX Red
Any Experimental Category aircraft with an engine displacement of 320 cubic inches or less, normally aspirated, with at least two fixed landing gear.

FX-T Red
Any Experimental Category aircraft with an engine displacement of 320 cubic inches or less, turbo/super-charged (any forced-induction), with at least two fixed landing gear.

RV Gold
Open to any Van's RV-series aircraft powered by an engine over 360 cubic inches, normally aspirated.

RV-T Gold
Open to any Van's RV-series aircraft powered by an engine over 360 cubic inches, turbo/super-charged (any forced-induction).

RV Blue
Open to any Van's RV-series aircraft powered by an engine of 360 cubic inches or less, normally aspirated.

RV-T Blue
Open to any Van's RV-series aircraft powered by an engine of 360 cubic inches or less, turbo/super-charged (any forced-induction).

RV Red
Open to any Van's RV-series aircraft powered by an engine of 320 cubic inches or less, normally aspirated.

RV-T Red
Open to any Van's RV-series aircraft powered by an engine of 320 cubic inches or less, turbo/super-charged (any forced-induction).

SPRINT CLASS
Any Experimental Category aircraft with an engine displacement of 240 cubic inches or less, normally aspirated.

SPRINT-T CLASS
Any Experimental Category aircraft with an engine displacement of 240 cubic inches or less, turbo/super-charged (any forced-induction).

SPORTSMAN
Any Experimental Category aircraft using a VW or Corvair normally aspirated engine conversion

SPORTSMAN-T
Any Experimental Category aircraft using a VW or Corvair turbo/super-charged (any forced-induction) engine conversion