Variometer installation

On Nov 26, 6:21 pm, Bob Kuykendall wrote:
Earlier, wrote:
...So I guess my choice is either a fuselage mounted probe, or
no probe at all.

I recommend the fuselage probe. Ten dollars worth of parts and you're
good to go.

See Nicks and Johnson for the original idea and its refinement. This
article is pretty clear about it:

http://wcsa.org/docs/TEprobe.pdf

Also, see Sebald for an alternative installation that combines TE
probe and radio antenna:

http://www.soaridaho.com/Schreder/Co...E_ANTENNA.html

Thanks, Bob K.

Hi Guys - The quality of the TE probe you need is related to
the square of your speeds of interest. A floater and/or low
L/D glider is going to be fine with a low-performance
probe. The '26 driver that's bothered by the airvent effect
should simply remove the canopy and all will be well...
See ya, Dave "YO"

On Nov 27, 5:00 pm, wrote:
...The quality of the TE probe you need is related to
the square of your speeds of interest...

Ah, that makes sense. Thanks!

Bob K.

On Nov 27, 9:05 pm, Bob Kuykendall wrote:
On Nov 27, 5:00 pm, wrote:

...The quality of the TE probe you need is related to
the square of your speeds of interest...

Ah, that makes sense. Thanks!

Bob K.

No problem ! In my case, I need a good probe,
even though at 100 knots cruise my L/D is
degraded to a mere 35:1...
See ya, Dave "YO"

wrote:
Hi Guys - The quality of the TE probe you need is related to
the square of your speeds of interest. A floater and/or low
L/D glider is going to be fine with a low-performance
probe. The '26 driver that's bothered by the airvent effect
should simply remove the canopy and all will be well...

Speed and drag, it would seem. The need for TE is going to be driven by
how long your stick thermals last, which will be made longer by higher
speeds and less drag.

The vent doesn't bother me exactly, it's just an interesting effect I
thought about. As far as the sport canopy goes, the last time I flew I
almost froze to death right in the air, so I'm going to have to pass on
that idea at least until the weather turns warm again.

--
Michael Ash
Rogue Amoeba Software

On Nov 27, 10:03 pm, Michael Ash wrote:
wrote:
Hi Guys - The quality of the TE probe you need is related to
the square of your speeds of interest. A floater and/or low
L/D glider is going to be fine with a low-performance
probe. The '26 driver that's bothered by the airvent effect
should simply remove the canopy and all will be well...

Speed and drag, it would seem. The need for TE is going to be driven by
how long your stick thermals last, which will be made longer by higher
speeds and less drag.

The vent doesn't bother me exactly, it's just an interesting effect I
thought about. As far as the sport canopy goes, the last time I flew I
almost froze to death right in the air, so I'm going to have to pass on
that idea at least until the weather turns warm again.

--
Michael Ash
Rogue Amoeba Software

freezing is half the fun of the sport canopy. the "im at cloud base
and i cant feel my toes but im not going down cause im higher than my
CFIG" mindset kicks in.

Oh and there goes Nadler, showing off again

I think my L/D at 100 knots is about 3.5:1, practically the same
right??

On Nov 28, 12:55 am, wrote:
On Nov 27, 10:03 pm, Michael Ash wrote:



wrote:
Hi Guys - The quality of the TE probe you need is related to
the square of your speeds of interest. A floater and/or low
L/D glider is going to be fine with a low-performance
probe. The '26 driver that's bothered by the airvent effect
should simply remove the canopy and all will be well...

Speed and drag, it would seem. The need for TE is going to be driven by
how long your stick thermals last, which will be made longer by higher
speeds and less drag.

The vent doesn't bother me exactly, it's just an interesting effect I
thought about. As far as the sport canopy goes, the last time I flew I
almost froze to death right in the air, so I'm going to have to pass on
that idea at least until the weather turns warm again.

--
Michael Ash
Rogue Amoeba Software

freezing is half the fun of the sport canopy. the "im at cloud base
and i cant feel my toes but im not going down cause im higher than my
CFIG" mindset kicks in.

Oh and there goes Nadler, showing off again

I think my L/D at 100 knots is about 3.5:1, practically the same
right??

Please don't try fly that contraption so fast;
life is short enough as it is !

The probe issue was pretty much settled for me when Bob observed that
the fuselage probe works better in practice than in theory. Thanks
for the advice.

I'm curious about the "sport canopy". Do you refer to flying with the
canopy removed? Is this something people talk about? I saw some
video of guys parachuting from a Blanik from which the canopy was
removed. It looked cool for the summer. I've flown with the canopy
of a 2-33 opened and enjoyed the breeze. Will a B4 explode if you fly
it with the canopy removed?

wrote:
I'm curious about the "sport canopy". Do you refer to flying with the
canopy removed? Is this something people talk about?

Not exactly removed, but replaced with one which only covers the front to
block the incoming wind, leaving the top and sides open. Kind of like a
convertible. I've never used one but I've heard they're fun, although they
cost a fair bit of performance.

--
Michael Ash
Rogue Amoeba Software

On Nov 28, 8:56 am, wrote:
I'm curious about the "sport canopy". Do you refer to flying with the
canopy removed? Is this something people talk about?

Many years ago, afternoon on a nice summer day at
Sugarbush, one of the pundits spotted my whale, sans
overhead canopy, near the flight line. "Have you forgot
something Dave" asks the pundit ? Nawh, says one
of my buddies, Dave's just decided its too much work
to clean the canopy and decided its unnecessary in
any case, and its easier to see out without the
dirty canopy. So the pundit gives us a long lecture
on how the turbulence from the open area will
cause the thing to be unstable and I'll no doubt
crash and die. And a lot of really big words poor
Dave couldn't pronounce let alone comprehend.
Lecture continued for many minutes.

Had to finally explain that I came down because
I was freezing my ass off in the wave sans canopy,
really guys flies just fine, left it by the flight line
because I'll go back up after I warm up a bit
but this time not up in the wave. And I'll clean
the canopy some other day...

Will a B4 explode if you fly it with the canopy removed?

Undoubtedly, according to the pundit ;-)

See ya, Dave "YO"

PS: I know, I've got to get the whale back in
the air someday...

PPS: Seriously, not all of our toys are safe
without canopy...

wrote:
On Nov 27, 10:03 pm, Michael Ash wrote:
The vent doesn't bother me exactly, it's just an interesting effect I
thought about. As far as the sport canopy goes, the last time I flew I
almost froze to death right in the air, so I'm going to have to pass on
that idea at least until the weather turns warm again.

freezing is half the fun of the sport canopy. the "im at cloud base
and i cant feel my toes but im not going down cause im higher than my
CFIG" mindset kicks in.

"To death" was only a slight exaggeration there, I was shivering like mad
and could barely get out of the cockpit by the time I landed. It was a
little more than "I can't feel my toes" that time.

--
Michael Ash
Rogue Amoeba Software