Airparks; Living On The Beaten Path?

Highflyer wrote:
"cavelamb himself" wrote in message
...
All it takes is a little collar on the pitot tube (and a bit of tweaking
the position)

That is how we calibrate the airspeed indicator to get it reading with
reasonable accuracy. Old CG himself taught me that one. :-)

Of course, nowadays, you have to tweak the GPS also!


Anybody have photos of such a collar? Or able to give a good description?

Gig 601XL Builder wrote in
:

Highflyer wrote:
"cavelamb himself" wrote in message
...
All it takes is a little collar on the pitot tube (and a bit of
tweaking
the position)

That is how we calibrate the airspeed indicator to get it reading
with reasonable accuracy. Old CG himself taught me that one. :-)

Of course, nowadays, you have to tweak the GPS also!


Anybody have photos of such a collar? Or able to give a good
description?


Pretty sure there's one in Tony Bengelis' books. But you just take a
collet and slide it over the tube and then experiment by moving it back
and forth until your ASI is doing what you think is right.

Bertie

In article ,
Bertie the Bunyip wrote:


Anybody have photos of such a collar? Or able to give a good
description?


Pretty sure there's one in Tony Bengelis' books. But you just take a
collet and slide it over the tube and then experiment by moving it back
and forth until your ASI is doing what you think is right.

Bertie

I tried that on my Johnson Rocket and got it to indicate 200 MPH in
level flight! Of course, it stalled at 100 instead of 60. ;)

All it is is an O-ring or something similar placed ahead of the static
pickup in the pitot/static system. This works only on planes that have a
combined pitot/static head, not on those that have the flush-mounted
static port on the side f the fuselage.

--
Remove _'s from email address to talk to me.

Orval Fairbairn wrote in
news
In article ,
Bertie the Bunyip wrote:


Anybody have photos of such a collar? Or able to give a good
description?


Pretty sure there's one in Tony Bengelis' books. But you just take a
collet and slide it over the tube and then experiment by moving it
back
and forth until your ASI is doing what you think is right.

Bertie

I tried that on my Johnson Rocket and got it to indicate 200 MPH in
level flight! Of course, it stalled at 100 instead of 60. ;)

All it is is an O-ring or something similar placed ahead of the static
pickup in the pitot/static system. This works only on planes that have
a
combined pitot/static head, not on those that have the flush-mounted
static port on the side f the fuselage.



Ah, OK, you mean the ones with two tubes, right?


Bertie

In article ,
Bertie the Bunyip wrote:


Bertie

I tried that on my Johnson Rocket and got it to indicate 200 MPH in
level flight! Of course, it stalled at 100 instead of 60. ;)

All it is is an O-ring or something similar placed ahead of the static
pickup in the pitot/static system. This works only on planes that have
a
combined pitot/static head, not on those that have the flush-mounted
static port on the side f the fuselage.



Ah, OK, you mean the ones with two tubes, right?

It doesn't matter -- all you have to do is be able to erect an airflow
fence ahead of the static pickup. This is one of the oldest tricks in
aviation -- dating back to at least the Thirties. It enabled salesmen to
sell a lot of "fast" airplanes!

--
Remove _'s from email address to talk to me.

Orval Fairbairn wrote in
news
In article ,
Bertie the Bunyip wrote:


Bertie

I tried that on my Johnson Rocket and got it to indicate 200 MPH in
level flight! Of course, it stalled at 100 instead of 60. ;)

All it is is an O-ring or something similar placed ahead of the
static pickup in the pitot/static system. This works only on planes
that have
a
combined pitot/static head, not on those that have the
flush-mounted static port on the side f the fuselage.



Ah, OK, you mean the ones with two tubes, right?

It doesn't matter -- all you have to do is be able to erect an airflow
fence ahead of the static pickup. This is one of the oldest tricks in
aviation -- dating back to at least the Thirties. It enabled salesmen
to sell a lot of "fast" airplanes!


Heh! Yeah, I think I've flown a few of those! I've certainly lown a few
where th eASI was next to useless, anyway.

Bertie

"Gig 601XL Builder" wrote in message
...
Highflyer wrote:
"cavelamb himself" wrote in message
...
All it takes is a little collar on the pitot tube (and a bit of tweaking
the position)

That is how we calibrate the airspeed indicator to get it reading with
reasonable accuracy. Old CG himself taught me that one. :-)

Of course, nowadays, you have to tweak the GPS also!


Anybody have photos of such a collar? Or able to give a good description?

Put an o-ring over the static tube. Adjust its distance from the static
holes in the side of the tube to adjust the static pressure reference for
your airspeed indicator. It also adjusts the static pressure reference for
the altimeter, which usually uses the same static port.

It doesn't work for the new airplanes th at pick up their static pressure
through a port on the side of the fuselage. :-)

Highflyer
Highflight Aviation Services
rec.aviation.homebuilt annual flyin coming up May 16, 17, and 18.
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at so she knows how many groceries to get.