REFLECTOR: Where to put your AHRS

Hiroo Umeno humeno at microsoft.com
Tue Sep 26 11:13:15 CDT 2006


The "cheapest" I found so far is about $4K.

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of michalk
Sent: Tuesday, September 26, 2006 8:41 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Where to put your AHRS

I was hoping you found a cheap fiber optic gyro.

Hiroo Umeno wrote:
> Mine was purchased years ago when the prices were not very good.  I think the whole setup with two MFDs, AHRS, ADU, etc was about $30K.  I think you can get the same thing now for close to half that.
>
> It was made by (then) Sierra Flight Systems which is now Chelton.  Direct-To Avionics is their outlet for the experimental market.
>
> Now you get a lot more choices in the systems than back then but it seems that Chelton unit still holds some of the features edge (and the price to go with it, too).
>
> Hiroo
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of michalk
> Sent: Tuesday, September 26, 2006 7:20 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Where to put your AHRS
>
> Fiber Optic Gyro ...  Has the price come down?
> I already deleted the previous posts.  Who makes it?  How much does it cost?
>
> Hiroo Umeno wrote:
>
>>It seems that judging from much of the responses I got, many of you have units that has separate AHRS and magnetometer.  As it turns out, mine is an integral unit.  One black box that has inertial sensor, magnetometer, fiber-optic gyro, all built in.  I currently have the unit on top of the sump tank and I see the attitude reading drops off as I get above 40Kts or so.  During the flight, usually in turns, the reading would come back for a second or so but for the most part, they remain off.
>>
>>The manufacturer suggested it may be caused by magnetic interferance.  They told me that under the seat would be tricky since movement of the seats will affect the magnetic field.  They also told me to keep the unit close to the aircraft's rotational axis and away from major high-current wires.  Well, on a Velocity, that pretty much rules out the whole plane...
>>
>>Hiroo
>>
>
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