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pwmac(at)sisna.com
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 Posted: Fri Sep 22, 2006 5:39 am Post subject: Can someone share experience tuning static port? |
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True. Just look at any spam can that has a pitot/static. They stick
out ahead of the leading edge. Not to far. Correct location is a no brainer.
Paul
==============
At 03:55 AM 9/22/2006, you wrote:
| Quote: |
If the static port was installed well away from the airframe, so it
was actually sensing the free stream static pressure, if probably
would be quite accurate. But, the original poster is putting the
static port near the wing. Wings by design cause an increase in
pressure below them, and a decrease in pressure above them. It is
very difficult to find a location near a wing where a static port
will read correctly over the whole range of airspeeds and flap
angles. Thus the desire to tune the static port with O-rings.
Kevin Horton
On 21 Sep 2006, at 23:59, PWilson wrote:
>
>
>My fluids book uses a static probe for wind tunnel testing that has
>multiple holes. This allows the pitot/static unit to operate with
>better accuracy at various angles to the wind stream. Like 10
>holes. The book also specifies the diameter. No suggestion for o-
>ring to be accurate.
>Regards. Paul
>================
>
>At 10:22 AM 9/20/2006, you wrote:
>>
>>
>>I have a Europa XS Monowheel, it has the static port under the
>>wing, it is
>>a tube with a closed nylon bullet at the tip, and 2 holes in it a
>>bit aft
>>of the lead edge of the bullet, 1 vertical and 1 horizontal.
>>
>>I heard a while back you can tune this static port by installing a
>>O-Ring,
>>think start point was an inch or so behind the holes in the bullet??
>>
>>Can someone share experience tuning static port?
>>
>>How did you determine when it was correct?
>>
>>What distance was neutral point for O-Ring?
>>
>>Does moving O-Ring forward from neutral increase static pressure?
>>
>>What size O-Ring did you use, did size make much a difference,
>>what was
>>O-Ring made out of and how did you permanent bond in place?
>>
>>Thx.
>>Ron Parigoris
>>
>>(I posted to Europa group, no replies)
>>
>>
>>
>
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khorton01(at)rogers.com
Guest
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| Posted: Fri Sep 22, 2006 1:03 pm Post subject: Can someone share experience tuning static port? |
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If you put it one or more wing chord widths ahead of the leading
edge, it would probably be OK. But that implies a fairly long pitot
boom, which would be easily damaged, and fairly heavy. Not a common
choice now days.
If you have the skills to select a good location that is closer to
the leading edge, you could make a lot of money consulting. It is
not easy to predict a location close to the wing that will be
accurate. I've watched two different aircraft design teams try to
find good locations for static sources. Both teams had problems, and
spent a lot of hours doing trial and error flight testing, despite
the expenditure of many engineering man hours. One team also
invested in computational flow dynamics analysis, all for naught.
Kevin Horton
On 22 Sep 2006, at 09:36, PWilson wrote:
| Quote: |
True. Just look at any spam can that has a pitot/static. They stick
out ahead of the leading edge. Not to far. Correct location is a no
brainer.
Paul
==============
At 03:55 AM 9/22/2006, you wrote:
>
> <khorton01(at)rogers.com>
>
> If the static port was installed well away from the airframe, so it
> was actually sensing the free stream static pressure, if probably
> would be quite accurate. But, the original poster is putting the
> static port near the wing. Wings by design cause an increase in
> pressure below them, and a decrease in pressure above them. It is
> very difficult to find a location near a wing where a static port
> will read correctly over the whole range of airspeeds and flap
> angles. Thus the desire to tune the static port with O-rings.
>
> Kevin Horton
> On 21 Sep 2006, at 23:59, PWilson wrote:
>
>>
>>
>> My fluids book uses a static probe for wind tunnel testing that has
>> multiple holes. This allows the pitot/static unit to operate with
>> better accuracy at various angles to the wind stream. Like 10
>> holes. The book also specifies the diameter. No suggestion for o-
>> ring to be accurate.
>> Regards. Paul
>> ================
>>
>> At 10:22 AM 9/20/2006, you wrote:
>>>
>>> <rparigor(at)suffolk.lib.ny.us>
>>>
>>> I have a Europa XS Monowheel, it has the static port under the
>>> wing, it is
>>> a tube with a closed nylon bullet at the tip, and 2 holes in it a
>>> bit aft
>>> of the lead edge of the bullet, 1 vertical and 1 horizontal.
>>>
>>> I heard a while back you can tune this static port by installing a
>>> O-Ring,
>>> think start point was an inch or so behind the holes in the
>>> bullet??
>>>
>>> Can someone share experience tuning static port?
>>>
>>> How did you determine when it was correct?
>>>
>>> What distance was neutral point for O-Ring?
>>>
>>> Does moving O-Ring forward from neutral increase static pressure?
>>>
>>> What size O-Ring did you use, did size make much a difference,
>>> what was
>>> O-Ring made out of and how did you permanent bond in place?
>>>
>>> Thx.
>>> Ron Parigoris
>>>
>>> (I posted to Europa group, no replies)
>>>
>>>
>>>
>>
>
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