Definitions of various indoor flying terms

Torque - 1 - A force acting to roll the plane along the longitudinal axis. It is a reaction to the propellers rotation and is greatest at the beginning of the flight when the model is launched. 2 - A measure of the energy in a wound rubber motor.

ROG - Rise Off Ground. A flight profile where the model has landing gear  and is launched with the plane sitting on the ground as opposed to a hand launch.

Cross Section of motor - A term that refers to the size of the motor (not the length). Generally most indoor planes are flown on a single loop of rubber and the currently available rubber has a nominal thickness of .042" so this term would refer to the width of the rubber used (i.e. .038", .054", etc.) in a single strand.

Propeller Pitch - A theoretical number that describes how far the propeller would move forward with a single rotation if there were no slippage. Higher pitches require greater motor cross section to turn them and generate more torque that the plane must counteract, but they also slow down the RPM of the prop possibly  allowing a longer motor run.

Tan I - A brand name of special rubber strip made specifically for model airplane flying that was produced in the late 80's and early 90's.

Tan II - A brand name of special rubber strip made specifically for model airplane flying that is currently produced and sold by FAI Model Supply.

Stab - The horizontal stabilizer of a plane.

Decalage - The difference in the angle of attack between the wing and the horizontal stabilizer. Generally the main wing will have a greater angle of attack than the stabilizer. The greater this difference is generally the more stable the airplane is in pitch and the quicker it will recover from a ceiling bump, but it will generally have more drag than a plane with a lesser difference.

Incidence - Another term for angle of attack.

A, B, C Grains - Descriptions of different cuts of balsa. Determined by the orientation of the surface of a sheet to the rays in the wood. Each cut exhibits different characteristics. 

Ambroid - A brand of glue frequently used by indoor fliers. It is based on acetate plastic dissolved in a solvent. normally diluted to a thinner consistency with acetone and frequently placticizers such as TCP and DOP are added to eliminate shrinkage.

Thrust Bearing - The fitting that holds the prop shaft to the plane.

How one can "Drill a small hole (0.016")" - By using very small drill bits. Commercial number sized twist bits are available down to .0135" for a #80. Smaller holes can be drilled by grinding the end of a piece of music wire to form a spade type drill bit.

45 degree station - A method of describing the pitch of a prop by giving the distance from the center of the prop to the location at which the prop forms a 45 degree angle to the plane of rotation. For a lower pitch prop this will be smaller (closer to the prop shaft) that for a higher pitch prop.