Seaplane Dynamic

Question 1

Hydrodynamic Lift

Answer 1

the upward force generated by the motion of the hull or floats through the water

Question 2

Displacement/Idling Position

Answer 2

The attitude of the seaplane when its entire weight is supported by the buoyancy of the floats

Question 3

5 ways to determine wind direction and speed

Answer 3

1) classy bands - indicates windward side
2) waves - run perpendicular to wind
3) wind streaks - run parallel to wind
4) smoke, flags, external indicators
5) weather into the wind (on the water)

Speed:

• wind streaks form @ 8-14 knts
• white caps form @ 15 knts

Question 4

Four phases of a Spin

Answer 4

1) Spin entry
2) Incipient phase - initial rotation
3) Fully developed phase- full rotation; airspeed, vertical speed, rate of rotation are stabilized in a near vertical flight path
4) Recovery phase - rotation ceases and AOA of wings decrease below critical AOA
- Power to Idle
- Ailerons Neutral
- Full opposite rudder against rotation
- Positive, brisk, straight forward elevator (forward of neutral); drives aircraft toward unstalled state
- neutralize rudder after rotation stops
- Elevator back pressure to return to level flight

Question 5

What is a spin?

Answer 5

An aggravated stall which typically occurs from a full stall with an aircraft in a yawed state

• the outboard wing is less stalled than the inboard wing
• airplanes wings exceed their critical angle of attack with a side-slip or yaw acting on the plane