SR22 Systems ?

[siucavflight]

Looking for a little help here explaining to my student how the electronic HSI works in the SR-22 G2 version

The POH says that the HSI derives it information from both a Flux detector and an remote Gyro. But with this system you never have to initially tell the HSI your heading to start with. So I am not understanding how this works. What is a Flux dectector and how does it work together with a remote gyro to determine my heading?

Any help would be very appriciated.

 

[ROB-x38]

G'day siucavflight

The flux detector or flux valves are usually located in the wingtips or tail (away from most of the aircraft's magnetic fields) and sense the aircraft's heading relative to the magnetic field (remember those lines of magnetic force which stem from the magnetic poles and curve around the earth).

If the heading displayed in the aircraft differs to the one sensed by the flux detector an error signal is produced, resulting in a torque being applied to the gyro gimbals to realign it (just like when you manually realign the compass to DG).

The gyro uses its property of rigidity to maintain the new alignement (just like on the DG you have to adjust manually based on the compass heading).

That's the basic idea, hope it helps

 

[Iceman21]

Do you have the Sandel manual? It should explain the operation of the instrument in a bit more detail. If not, PM me.

 

[DenverDude2002]

Must be one rich mofo to be doing training in an SR22, wish I had that kind of money.....

 

[siucavflight]

Rob,


Thank you. Your info helped a lot. The only info I was able to get out of was from the POH was that there was a flux detector in the right wing. Also do you know why the flux detector would be hooked to an amplifier under the copilot seat. What does the amplifier do?

Again thank you for your help.

 

[Iceman21]

I would imagine you have a fluxgate and a gyro for redundancy and info checking, as Rob stated.

I think the reason for the amplifier is to increase and/or regulate voltage going to the sandel. Could be wrong, but that is what I gathered in my 5 minutes of searching the stuff on my HDD.

 

[ROB-x38]

Happy to help siucavflight

As you may know magnetism and electricity are closely related, and you can use one to generate the other (eg: alternator).

In the case of the flux detector the earth's magnetic field induces a tiny voltage or current in the unit which then needs to be amplified before it is sent to realign the gyro.

Cheers.