EFIS Gyros ??

[Guest Maj Millard]

In relation to an EFIS artifical horizon display, what drives it?...are there small gyros in the box, or is it done purely electronically....inquiring minds want to know !.......

 

 

[hihosland]

I think that most of them have a series of at least three acellerometers arranged in different planes.

 

There are different designs but some of these are essentially incredabily small tuning forks which when subjected to an acelleration flex a tiny amount and the electronics detect this flexing and translate it into the information that is displayed.

 

that is my rather limited understanding of how they work

 

 

[facthunter]

High tech.

 

That explanation is good enough for me. This stuff is marvellous. The advances that have been made in the last short while give this technology to us at a minute fraction of the cost of the mechanical gyro based inertial systems that we had 25 years ago. Nev..

 

 

[Matt]

From Dynon for thier gear:

 

The EFIS-D100 uses three angular rate (gyro) sensors, three accelerometers, three magnetic field strength sensors, and three pressure transducers in its sensing platform.

 

 

[skybum]

Do a Google on MEMS accelerometer design and take your pick. I found this one to have a pretty good explanation of how the mechanics work...including pages of calculus proofs...and a couple of simple diagrams that show how it works.

 

http://www-personal.umich.edu/~sjmoura/files/ME128_2.pdf

 

Basic premise is Hookes Law linked to Newtons Law. The force required to extend a spring of known mass= mass x acceleration. On a nanometer scale! and cheap as chips.

 

ENJOY:thumb_up:

 

 

[Guest Maj Millard]

Thanks everybody, now I know as much as you do, pretty interesting stuff, one more question: is all this new stuff instantanous, or is there a slight noticable display on screen ?.................

 

 

[Matt]

From what I've seen of the Dynon products, there is no delay in the screen presentation of what's happening outside. The processing capability within, and accuracy to which these instruments are developed is very impressive...although that being said, in this day and age, is really to be expected.

 

 

[Guest Maj Millard]

...Thanks Matt................

 

 

[poteroo]

Have had Dynons in several aircraft over last 4 years or so. I have so much faith that I've gone absolute cold turkey in my RV9A with D-180 EFIS/EMS - with absolutely no analog instruments at all. Huge weight saving plus not much difference in cost.

 

I have mine wired to a Garmin 296 GPS, which also is into the Nav side of a Trutrak Digiflight IIVS a/p. The GPS CDI is displayed low on the EFIS flight insts display, but you can also scroll up a great HSI display.

 

There are probably technically superior brands about - but look at their prices!! Dynon also run an excellent technical forum, and their backup has been vg.

 

Although not TSO'd, they are very easy to fly at night, and with the 'bright screen' option - they are OK in sunlight. But, some form of lip on the inst panel helps a lot, as does a sunscreen under the large expanse of perspex in an RV.

 

happy days,