Fuselage Vents

The performance claims look extremely good ... is this plausible ?

http://www.dg-flugzeugbau.de/mandl-absaugung-e.html

KK

I love the timing. Right out of the XX playbook.


On Jul 30, 11:46 am, "Ken Kochanski (KK)"
wrote:
The performance claims look extremely good ... is this plausible ?

http://www.dg-flugzeugbau.de/mandl-absaugung-e.html

KK

On Jul 30, 8:46*am, "Ken Kochanski (KK)"
wrote:
The performance claims look extremely good ... is this plausible ?

http://www.dg-flugzeugbau.de/mandl-absaugung-e.html

KK
Thanks for posting this!

Sounds plausible to me, but what do I know? I DO know that at 70
knots, opening the vent in my Speed Astir (AKA the 'Grob Solar Sauna)
will drive the altimeter down 100' instantly, so there is positive
pressure to deal with. I also know that I have a perfect spot to make
an 'experimental' vent that is completely removable. Increasing
airflow in the cabin is more important to me than the performance
gain.

On Jul 30, 8:46*am, "Ken Kochanski (KK)"
wrote:
The performance claims look extremely good ... is this plausible ?

http://www.dg-flugzeugbau.de/mandl-absaugung-e.html

KK

Ventus mods have used a funnel behind the wheel well for years,
typically a 2" piece or pipe would form the exit.

Improvement here is the shape of the exit.

Regards

Al

Yawn............See the below, 1972!! Wil Schuemann H301 Libelle

http://www.betsybyars.com/guy/soarin.../72-modif.html


At 18:43 30 July 2008, wrote:
On Jul 30, 8:46=A0am, "Ken Kochanski (KK)"
wrote:
The performance claims look extremely good ... is this plausible ?

http://www.dg-flugzeugbau.de/mandl-absaugung-e.html

KK

Ventus mods have used a funnel behind the wheel well for years,
typically a 2" piece or pipe would form the exit.

Improvement here is the shape of the exit.

Regards

Al

Dear Uncle
If your altimeter changes indications when you open the vent, that
indicates your altimeter is not connected to STATIC. Best to check
you plumbing.

Guy Acheson, "DDS"



On Jul 30, 9:16�am, Uncle Fuzzy wrote:

Sounds plausible to me, but what do I know? �I DO know that at 70
knots, opening the vent in my Speed Astir (AKA the 'Grob Solar Sauna)
will drive the altimeter down 100' instantly, so there is positive
pressure

On Jul 30, 8:17 pm, wrote:
Dear Uncle
If your altimeter changes indications when you open the vent, that
indicates your altimeter is not connected to STATIC. Best to check
you plumbing.

Or (dramatic pause) it means that someone (previous owner?) has chosen
the cockpit as the static source. If this is the case, I think Mr
Fuzzy just learned why it's an excellent BACKUP source and a poor
primary one (hint-use a pneumatic toggle to switch to cockpit static
only when your REAL static system is waterlogged/frozen) Use your
ships actual static system. It works better than the cockpit.

My 2 Pesos,
-Paul

On Jul 30, 9:48*pm, sisu1a wrote:
On Jul 30, 8:17 pm, wrote:

Dear Uncle
If your altimeter changes indications when you open the vent, that
indicates your altimeter is not connected to STATIC. *Best to check
you plumbing.

Or (dramatic pause) it means that someone (previous owner?) has chosen
the cockpit as the static source. If this is the case, I think Mr
Fuzzy just learned why it's an excellent BACKUP source and a poor
primary one (hint-use a pneumatic toggle to switch to cockpit static
only when your REAL static system is waterlogged/frozen) Use your
ships actual static system. It works better than the cockpit.

My 2 Pesos,
-Paul

OR,
Uncle Fuzzy decided that he'd like his ALTIMETER to read the same
pressure as his FLIGHT RECORDER when the pneumatic switch is in the
CABIN position on his line to the Altimeter.

Uncle Fuzzy decided that he'd like his ALTIMETER to read the same
pressure as his FLIGHT RECORDER when the pneumatic switch is in the
CABIN position on his line to the Altimeter.


Now there is a thought.... Open the air vent if you are close to airspace
to make the logger think you are lower, and fit an extraction vent if you
want that height record.

jim

On Jul 31, 9:40*am, Jim White wrote:
Uncle Fuzzy decided that he'd like his ALTIMETER to read the same
pressure as his FLIGHT RECORDER when the pneumatic switch is in the
CABIN position on his line to the Altimeter.

Now there is a thought.... Open the air vent if you are close to airspace
to make the logger think you are lower, and fit an extraction vent if you
want that height record.

jim

I'd think the relatively sudden increase (or decrease) in the delta
between the GPS altitude and the Baro altitude would raise suspicions.
I know I'd look at it if I saw a significant jump, and I'm not exactly
a rocket scientist.