IMAA Giant Scale definition
Each year AMOS RC model club is pleased to hold this event at our club airfield. The one thing these planes are not is small! These are the big boys of the model aircraft world. Below is the definition of exactly qualifies under the IMAA Giant Scale rules (reproduced courtesy the IMAA website).
Article IV - Acceptable Aircraft
The purpose and goal of the International Miniature Aircraft Association, Inc. is to encourage and foster the building and flying of large radio controlled model aircraft. The term "Giant Scale" is also used by the Association to describe such aircraft. However, this term and the term "Large Scale Radio Controlled Model Aircraft," are in reference to the size of the model and not the full sized aircraft. The concept of "large" radio controlled model aircraft shall prevail over any other considerations in describing miniature aircraft. This concept of "large" is generally considered to apply to radio controlled model aircraft with minimum wingspans of eighty (80) inches for monoplanes and sixty (60) inches for multi-wing aircraft. Ducted Fan and Turbine aircraft with one hundred forty (140) inches combined length and width, measured from wing tip to wing tip at the widest point perpendicular to the fuselage and added to the length of the fuselage, excluding any protrusions. Autogyros with 50 inches for a single rotor, 80 inches for a dual rotor. Quarter (1/4) scale replicas or larger with proper documentation (minimum 3 view drawing of an actual person carrying aircraft) which do not fit the size requirements will be permitted. However, the concept does not encompass radio controlled model aircraft so large as to have the potential of carrying a human being. Giant Scale IMAA qualification also requires the RC model be a maximum weight of 55 pounds, with fuel – ready to fly. Models over this weight up to 100 pounds, with fuel – ready to fly (known as Experimental Radio Controlled Aircraft) may also qualify as IMAA giant scale provided they have a Permit To Fly signed by an AMA certified “Experimental Inspector”. These certified experimental models are listed on the AMA website under AMA documents, Permit To Fly list. Turbine aircraft will have the same combined length and width requirements as Ducted Fan Aircraft. In addition, each participant that will operate any model aircraft powered by a turbine engine will sign the AMA’s ‘Statement of compliance concerning Turbine Engine Operation’ and the aircraft must comply with the AMA’s ‘Safety Regulations for Model Aircraft Gas Turbines’.