問題一覧
1
The reason for maximum rotor limitation for Max. Rotor rpm with power on, is to?
To protect the engine and transmission
2
What is the reason for Max RPM with power on?
To protect the engine and transmission
3
What is the reason for the following operational requirement for minimum rotor rpm with power on?
To prevent excess coning angle and over pitching
4
What is the reason for operational limitation of maximum rotor RPM with power off?
To protect the structural limitations of the blades and rotor hub
5
The reason for operational limitation for minimum rotor rpm with power off ?
Inertia not available, so will fall rather than glide
6
The reason for limitation of never exceeded speed with power on?
to avoid retreating blade stall
7
The raising for limitation of never exceed speed with power off?
To prevent the horizontal stabiliser from exerting an excessive output force on tail boom
8
What is the limitation of maximum sideways speed?
For aircraft controllability
9
The reason for limitation for maximum reward speed?
For aircraft controllability
10
The reason for limitation of maximum takeoff weight?
For successful takeoff, excessive weights will reduce performance
11
Reason for limitation for Max all up weight?
To prevent structural damage, limitation and or reduced performance
12
Raising for limitation for minimum operating weight ?
To prevent adverse handling characteristics at weights below minimum, the rate of descent in auto rotation may be sufficient to maintain a safe rotor rpm
13
The reason for Max positive and negative flight load factors?
To prevent structural damage and maintain controllability of the aircraft
14
What is Lisa’s magic number?
418.889
15
Arm definition
Horizontal distance from the Datum
16
AUW definition
Aircraft all up weight (aircraft gross weight)
17
Azimuth Area
Critical relative (to the aircraft) wind Azimuth area - 050 to 210 degrees
18
Datum definition
An imaginary plane from which all arms are measured from
19
F.S.
fuselage Station ; distance between Datum and weight
20
ground effect -
More pronounced in still air , strong wind equals no ground effect
21
Helicopter performance is reduced by
Hot, humid, heavy, and high conditions. (high temperature, high humidity, high weight, high altitude). Hella, hard to fly in hot humid, heavy and high conditions.
22
MTOW
maximum takeoff weight , the weight of the aircraft for takeoff
23
Moment-
Arm X weight (weight multiplied by the horizon distance from the datum)
24
OEW operating empty weight.
operating weight is empty weight + oil + operating crew + additional removable equipment required for the operation
25
Empety weight (EW)
Aircraft weight with fixed equipment for its operations (cargo hook,ect) as well as all unusable fuel and undrainable fuel
26
zero feul weight
Weight of the helicopter as configure for the flight, without fuel.
27
VNE
Velocity never exceed
28
Maximum rotor RPM power on
Engine speed limitations (engine, and rotor. RPM as synchronised, so an increase in RRPM will increase ERPM. ERPM limits are usually exceeded before rotor limits and blade tip speed limitations. (compressibility.)
29
Minimum rotor RPM power on
Coning angle increases, and total rotor thrust is reduced as RRPM decays. The rotor will proceed to stall, and the disc can blow back and sever the tail boom.
30
Maximum rotor RPM power off
structural limitations of the road head and blades due to excessive centrifugal loads.
31
Minimum rotor RPM power off
less available energy in the rotor system to reduce rate of descent. (I think of having low RPM after flaring in an autorotation. after levelling off, your rpm was low. You might not have enough energy in the rotor to cushion the landing effectively).
32
VNE power on
Retraining blades stole, and compressibility
33
VNE power off
keeps horizontal stabiliser from un-stalling. (designed to stall in auto.) which would cause an upward face on the tail boom the result would be the nose pitching down more and loss of RRPM.
34
Maximum sideways speed
Controllability issue . Excessive parasite drug.
35
maximum rewards speed
Controllability issue . Induces weather, caul Induces weathercocking, and can lead to exhaust gases been drawn into the cabin.
36
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