Assembly And Rigging Spokane Community College Airframe CFR

Assembly And Rigging Spokane Community College Airframe.

CFR 14 Part 23. 181 Covers stability CFR 14 Part 23. 201 Covers Stalls

23. 173 Static longitudinal stability • (b) The airspeed must return to within the tolerances specified for applicable categories of airplanes when the control force is slowly released at any speed within the speed range specified in paragraph (a) of this section. The applicable tolerances are-

23. 177 Static directional and lateral stability • (a) The static directional stability, as shown by the tendency to recover from a wings level sideslip with the rudder free, must be positive • (b) The static lateral stability, as shown by the tendency to raise the low wing in a sideslip, must be positive

So what helps controls lateral stability? (stability about the longitudinal axis) • Dihedral • What control moves the aircraft about it’s lateral axis? – Pitch

So what helps control longitudinal stability? (stability about the lateral axis) – Elevator Trim – C. G. • What control moves the aircraft about it’s longitudinal axis? – Ailerons

So what helps control directional stability? (stability about the vertical axis) – Vertical Stabilizer • What control moves the aircraft about it’s vertical axis? – Rudder What do they put on float planes to increase directional stability? (stabiity about the vertical axis) Ventral Fin Sometimes require a larger rudder

Washing? • Washing In? – Increasing the angle of incidence • Pick Up wing? Lower wing? Washing out? Decreasing the angle of incidence Pick Up wing? Lower wing?

Control Names • Rudder and Elevator = – Ruddervator • Elevator and Horizontal Stabilizer = – Stabilator Elevator, Horizontal and Vertical Stabilizer and Rudder = Ruddervatorizer! (just kidding)