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pwmac(at)sisna.com
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 Posted: Thu Sep 21, 2006 8:18 pm Post subject: Can someone share experience tuning static port? |
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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:
| Quote: |
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
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| Posted: Fri Sep 22, 2006 1:58 am Post subject: Can someone share experience tuning static port? |
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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:
| Quote: |
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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