How does a trutrac work?

[brianDG303[_2_]]

Anyone got a clue as to how the pictorial T&B works? I don't see how
they can get good data with just accelerometers.

[Darryl Ramm]

On Jan 23, 9:07*am, brianDG303 > wrote:
> Anyone got a clue as to how the pictorial T&B works? I don't see how
> they can get good data with just accelerometers.

Accelerometers? It will use a MEMS gyroscope. See
http://en.wikipedia.org/wiki/MEMS_gyroscope

(I'll repeat a concern I have about the TruTrak ADI - not the
Pictorial T&B that Brian is asking about. The ADI presents a "vertical
speed enhanced pitch indication". That worries me if you are sucked
into a CB with dramatic up/down drafts or enveloped in a lennie on a
strong wave day. I just don't want to be in a situation of having to
double guess whether to ignore a pitch indication while doing the
instrument scan. Has anybody checked out this behavior of the ADI in a
sailplane in practice?)

Darryl

[BT]

Would you believe that the "Aided INS" in the B-1 is just accelerometers?
It is "aided" in that present position updates were input into the system to
"adjust" the computed velocities based on a Kalman filter process. Of course
the Aided INS has changed since I retired with the advent of GPS into the
aircraft. But still the Aided INS driven by accelerometers and update able
by radar fixes still exists for that time that you have lost GPS lock.

BT

"brianDG303" > wrote in message
...
> Anyone got a clue as to how the pictorial T&B works? I don't see how
> they can get good data with just accelerometers.
>

[bumper]

"brianDG303" > wrote in message
...
> Anyone got a clue as to how the pictorial T&B works? I don't see how
> they can get good data with just accelerometers.
>

I think it must be magic. Flick on the power switch and it gives good info
in less than 3 seconds . . . even if you power it up while cranked over on a
wing tip. (I have the T&B, no pitch info).

bumper
zz
Minden