REFLECTOR: Speeds

[Scott Derrick]

Glenn,

I only mention it because I thought the airspeed indicator was good to 
go on my plane and somebody told me how to check it and it was pretty 
far off. a couple hundred feet which also changed my airspeed by about 
10 knots at cruise.

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Speeds
From: Glenn Babcock <glennbabcock at roadrunner.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 06/06/2012 08:59 PM

> Scott,
>
> You are correct, I meant static inspection. I take your point, and realize that the static test is "static". :-)
>
> I've done a lot of work to get my static system accurate in flight, but as I said I've never tried your dynamic test. I do think that there is value in cross checking GPS speeds and known winds with the TAS on my EFIS.
>
> I'll definitely try your test and let you know. Thanks!
>
> Regards,
> Glenn
>
> On Jun 6, 2012, at 9:10 PM, Scott Derrick<scott at tnstaafl.net>  wrote:
>
>> Glenn,
>>
>> I'd be glad to apologize if proved wrong, but...
>>
>> There is no pitot-static inspection for VFR or IFR, just static. And all that verifies is that your altimeter and encoder report the correct "BENCH" test altitude.  I too had a current IFR static sign off when my static system was 250 ft off at 150 kias! Static sign off means absolutely nothing about the accuracy of it in flight.
>>
>> You could have 10 GPS's on board and you still may not know your TAS! Not to belabor the point but I also fly with an IFR Approach Approved GPS.  Certainly doesn't mean any thing about the in flight accuracy of your static or pitot system, or your TAS.
>>
>> Scott
>>
>> -------- Original Message --------
>> Subject: Re: REFLECTOR: Speeds
>> From: Glenn Babcock<glennbabcock at roadrunner.com>
>> To: Velocity Aircraft Owners and Builders list<reflector at tvbf.org>
>> Date: 06/06/2012 06:04 PM
>>
>>> Scott,
>>>
>>> I'd be glad to take you up and listen to your apology. I have an IFR bird with a current pitot-static inspection and 3 GPSs including an IFR certified unit.  I regularly fly 500+ mile trips using those airspeeds. My numbers are accurate.
>>>
>>> Regards,
>>> Glenn
>>>
>>> On Jun 6, 2012, at 6:48 PM, Scott Derrick<scott at tnstaafl.net>   wrote:
>>>
>>>> Richard,
>>>>
>>>> I think your doing very well at 170 KTAS..
>>>>
>>>> I haven't seen a Std RG any faster when comparing TAS.
>>>>
>>>> I don't have much confidence when I hear somebody reporting faster speeds than that with an STD RG. The longwing STD's are 5-10 knots slower than the orig STD.
>>>>
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-- 
While I see many hoof marks going in, I see none coming out. It is 
easier to get into the enemy's toils than out again.
Aesop