Help : Gyros

[Greystone]

Hi all,

What do you think about these following questions?
Here they are :

1- In a turn at constant angle of bank the rate of turn is :
a) independant of weight and inversely proportional to speed
b) dependant of weight and inversely proportional to speed

Would say a).

2- The flux valve of the RIMC gyro magnetic compass :
a) is pendulously mounted and remains aligned with the earth magnetic field.
b) is fixed to ans turns with the aircraft to create a field which is used to measure the angle between the aircraft and the earth magnetic flux lines.
c) is not subject to turning and acceleration error.
d) is pendulously suspended and is not affected by the vertical component of the earth magnetic field.

No idea, perhaps b).

3- In a slaved gyro compass system the output of the magnetic detector is fed to the:
a) annunciator
b) error detector
c) flux valve
d) precession amplifier

I'd say answer b). Annunciator is to measure synchronisation between magnetic indication & gyro indication. Precession amplifier, as its name says, is to amplify the precession signal. So i'm hesitating between b) and c), b) sounds a bit better though.

Thanks for your help guys!

[HAN]

Hi!

Question 1
answer a) is correct because
rate of turn omega = (gravity acceleration/ground speed).tang(bank angle)

Question 2
is pendulous mounted => OK
remains aligned with the earth magnetic fied => OK
because in fact it senses the projection of it on the banked aircraft when turning
=> answer a)

Question 3)
b) is correct because the error detector compares the gyro heading signal with the
magnetic heading signal provided by the flux valve (magnetic detector).

Good luck for year 2010

[pAolO]

Question2
Ye souis pas d'accord:
Il me semble me rappeller que c'est pendulaire, mais pas fixe par rapport au champ magnetique.
En fait c'est pendulaire en pitch et roll, mais pas en yaw.
C'est justement son angle au champ magnetique qui genere differents courants dans les 3 branches, et crée tout le tintouin derriere.
Je dit B! et c'est mon dernier mot.