Dillman Gouge Flashcards
What are the 12 Vmc Items
critical engine inop
critical engine windmilling
sea level
max takeoff power
landing gear retracted
flaps in T.O. position
cowl in T.O. position
trim for T.O position
most rearward CG
max gross weight
sea level
no more than 5 bank toward op engine
definition of Vmc
minimum flight speed at which the airplane is directionally controllable with one engine inoperative
What is a critical engine
the engine whose failure most adversely affects the aircraft, i.e. the one with the shortest moment arm thus requiring less resisting force to maintain directional control
Which of our engines is our critical engine
we do not have one because of our counter rotating props
what is zero side slip
a small amount of bank and slightly uncoordinated flight to align the fuselage with the direction of travel and minimize drag
what is our zero side slip
half a ball
2-3 degrees
Which cylinders does the priming solenoid prime?
1,2, and 4
Why do we not prime cylinder 3
it is used to gauge cylinder head temperature
Engine system
2 180HP @ 2700 RPM direct drive horizontally opposed air cooled 4 cylinder engine
Propeller and its properties
propellers are connected directly to the crankshaft of the engine.
oil sends the propeller high rpm low pitch
no oil/ nitrogen gas sends the propeller low rpm high pitch unfeathering accumulator - helps unfeather our engine with nitrogen gas and oil
What is the difference between VMC and VS on the diagram and what does that mean to us as pilots
Vmc item maximum takeoff power
Vmc will increase with max takeoff power - lots of differential thrust
opposite - vmc decreases - differential thrust will be reduced
Vmc item inoperative engine windmilling
Vmc will increase with propeller windimilling - lots of drag created on one engine lots of thrust on the other = differential thrust
opposite - less drag created means less differential thrust which lowers vmc
Vmc item critical engine inoperative
Vmc will increase - one engine inoperative means that one wing creating lots of thrust and other wing creating none = lots differential thrust
opposite - both engines less turning forces less differential thrust
Vmc item at sea level
at sea level Vmc increases - denser the atmosphere better engine runs = more differential thrust
opposite - less dense atmosphere = engine not run as good = less differential thrust
VMC item gear up
Vmc increases with gear up - flat offers nothing for wing to move around = provides no directional control opposite- lowers Vmc because keel effect - allows more directional stability by the gear hanging down
Vmc item flaps in T.O position
NA - flaps move together and other than adding drag do not help or hurt us in with our differential thrust - effects vertical lift not horizontal
Vmc item Cowl Flap in T.O. position
NA - cowl flaps move together and do not add additional drag or lift and consequently do not effect thrust or weight. they do not change our differential thrust and do not effect our horizontal lift
Vmc item trim for takeoff
NA - trim effects our vertical component of lift not our horizontal component of lift. meaning that it will not help or effect our aircraft in Vmc
Vmc item CG most adverse condition (aft)
Vmc will increase - rearward CG will cause little arm and less effective rudder control - meaning it takes more rudder for the same control, meaning a higher speed will be our Vmc
Opposite - more forward arm will be more effective rudder lowering Vmc
Vmc item max takeoff weight
lowers with more weight - inertia will keep your plane from rolling and yawing because it is harder to displace more weight
opposite - lower weight means it is easier to be displaced (roll/yaw)
Vmc item up to 5 degree of bank into op engine
decreases with the correct bank - creates horizontal lift by using ailerons. Ailerons take part off the rudder which makes the rudder have more authority
opposite - not banked correctly adds 3 knots for every degree not banked correctly because you are taking away from your horizontal component of lift
