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Yak 52 Mystery Box

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Scooter

Joined: 10 Jan 2006
Posts: 155

Posted: Thu Mar 02, 2006 11:36 am Post subject: Yak 52 Mystery Box

Anyone know what the gizmo is to the rear of the ADF selector panel on the right hand side of the front cockpit?  It has a (RF?) dial in the very center and some switches around it.

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gus.fraser(at)gs.com
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Posted: Thu Mar 02, 2006 12:09 pm Post subject: Yak 52 Mystery Box

This is the automatic compass compensation system. In the tail cone you will

see a thing that looks like a small bowl about 3-4 inches across with wires

coming out of it. This is the magnetic detector unit. This detector gives a

direction for the compass to point to. Well you have a gyro that maintains a

heading for you. If the earth stood still that is all you would need but as

we know the earth rotates and as a gyro points will rotate in a fixed plane

in space it needs to be processed to make it move. 



Now I told you all that so that this makes sense. What the dial is the

latitude that you are operating at. An eye ball value is good enough. Set

that and one of the switches that you can see selects a hemisphere N or S as

those guys in Aus need to tweak the gyro in the other direction. When it

operates like this, using precession and the flux detector it is in what is

known as slaved mode ie the compass is slaved to the flux detector. There

will be a switch also do de-slave the compass. In this position the compass

is just like any old gyro compass that gets fitted to a Cessna a dumb gyro

head.



There is if I remember correctly a switch that allows you to manually

presses the gyro. This works in both slaved and free modes but is intended

to work like the little knob on the front of the Cessna Gyro to reset the

compass heading.



Look at the compass rose on the panel you should see the symbols for north

and south. Look at the control head for the same symbols chances are that

that is the hemisphere knob, one down. With the compass turned on one of the

switches will have a center position but will allow for momentary switching

in two directions this is the manual precession switch and with power on you

should see the compass dial move when it is moved. The remaining switch is

the slaved switch. If your compass comes up and knows which way to point

chances are it is in the slaved position. If it does not know which way is

up move the switch and try again.



Hope this helps



Gus 



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Scooter

Joined: 10 Jan 2006
Posts: 155

Posted: Thu Mar 02, 2006 12:31 pm Post subject: Re: Yak 52 Mystery Box

Thanks, I really appreciate that.  I saw that in the POH that i downloaded but the drawing didn't look anything like it.  Makes perfect sense now.

 	  gus.fraser(at)gs.com wrote: 	
		  This is the automatic compass compensation system. In the tail cone you will

see a thing that looks like a small bowl about 3-4 inches across with wires

--

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