So you think you have a low glide ratio!

In article ,
Don Hammer wrote:

The Boeing 707-300 is 19.5:1

As someone pointed out to me recently, that's probably engines at flight
idle, not shut down.

--
Bruce | 41.1670S | \ spoken | -+-
Hoult | 174.8263E | /\ here. | ----------O----------

Don Hammer wrote:
The Boeing 707-300 is 19.5:1

I had several cockpit rides (pre 9/11) in various Airbus types in
Germany. Some of the pilots were actually active glider pilots. They
claimed an L/D in the mid 20's, if they make the engines drag-wise
'disappear' by keeping them going at slightly above idle speed.

Remember the 'Gimli Glider', the Air Canada B767, that ran out of fuel?
Nice write-up at http://www.wadenelson.com/gimli.html
The author states an 11:1 glide ratio for this 132t glider with two
wind-milling P&W engines and a RAT sticking out of it's belly.

Just out of curiosity - does anyone have a number for the
space-shuttle?


Uli Neumann
Libelle 'GM'

I had several (pre 9/11) cockpit rides in various Airbus types over
Germany. Some of the crew members were active glider pilots and they
claimed an L/D in the mid 20's, if they make the engines 'disappear'
drag-wise by keeping them going a bit above idle speed.

Remember the 'Gimli Glider', the Air Canada B767, that ran out of fuel?
There is a nice write-up at http://www.wadenelson.com/gimli.html
The author states a 11:1 for this 132t glider with two wind-milling P&W
engines and a RAT hanging out of it's belly.

Just out of curiosity - does anyone have a number for the space
shuttle?

Uli Neumann
Libelle 'GM'

Shawn wrote:
COLIN LAMB wrote:
The January 2006 issue of AOPA Pilot has an article about a Pilatus PC-12
single engine turboprop. Beautiful airplane.

In the article is the following comment: "It's a great glider. ... the PC-12
has a 2.7-1 power off glide ratio at maximum gross weight - not bad at all
for a 9,920 pound airplane".

Just for reference, I calculated the glide ratio of the Schweizer 300C
helicopter I was flying and it is not far off from that, engine out. I
never could attain the calculated glide ratio with the helicopter, though.

I would never call anything with a 2.7-1 glide ratio as being great,
although it probably is better than the space shuttle.

I saw that too and figured it's gotta be a typo.

Shawn

Pilatus' web site states that the glide ratio of a PC-12 is 16:1.

It is a very clean aircraft (as turboprops go), but the wing loading is
35 lb./ft2. 16:1 seems optimistic, but I since it is on the internet,
I am sure that it is true.

Bob Zahradnik

Pilatus' web site states that the glide ratio of a PC-12 is 16:1.

It is a very clean aircraft (as turboprops go), but the wing loading is
35 lb./ft2. 16:1 seems optimistic, but I since it is on the internet,
I am sure that it is true.

Bob Zahradnik

Just got an answer from my friend who owns a 2 year old PC-12. Glide ratio
is 12:1 or approx. 2 nm per 1000 ft.

My Mooney 201 is the same, but lots cheaper!

All else being equal, the probability that I might "test" the Mooney's glide
ratio some day is much more than the chance of that PT-6 going quiet.

bumper

wrote in message
oups.com...
Pilatus' web site states that the glide ratio of a PC-12 is 16:1.

It is a very clean aircraft (as turboprops go), but the wing loading is
35 lb./ft2. 16:1 seems optimistic, but I since it is on the internet,
I am sure that it is true.

Bob Zahradnik

Taking off in a Mooney 201 from Albury-Woodonga in NSW, OZ, years ago
during a coast-to-coast and return holiday adventure, Kris and I had
just completed a right turnout when the engine swallowed an exhaust
valve and clattered to a stop. “Albury Tower, Mooney NWF is returning
immediately.” From 1100’ we had height for a truncated right hand
circuit back onto the runway and enough ground speed to roll off onto a
ramp parking spot. The Tower asked why an emergency had not been
declared – too busy said I – probably just as well, they replyed:
otherwise you would have been filling out paperwork for a week.

Kris and I hitched a ride to Tocumwal and enjoyed a soaring week while a
new engine was fitted to the Mooney. The ship’s owner had one in Perth
awaiting our return. The glide ratio was sufficient. BTW, that was the
only engine failure so far in 60 years of flying.


bumper wrote:
Just got an answer from my friend who owns a 2 year old PC-12. Glide ratio
is 12:1 or approx. 2 nm per 1000 ft.

My Mooney 201 is the same, but lots cheaper!

All else being equal, the probability that I might "test" the Mooney's glide
ratio some day is much more than the chance of that PT-6 going quiet.

bumper

wrote in message
oups.com...

Pilatus' web site states that the glide ratio of a PC-12 is 16:1.

It is a very clean aircraft (as turboprops go), but the wing loading is
35 lb./ft2. 16:1 seems optimistic, but I since it is on the internet,
I am sure that it is true.

Bob Zahradnik





--
Charles Yeates

ZS Jezow PW-6U & PW-5
http://www3.ns.sympatico.ca/yeatesc/world.html

Found a number of docs that refer to it as 22 degrees at 360mph
I've understood it to be about 4:1, but I don't do much math so I can't
convert the 22 degrees into a L.....
"GM" wrote in message
ups.com...
I had several (pre 9/11) cockpit rides in various Airbus types over
Germany. Some of the crew members were active glider pilots and they
claimed an L/D in the mid 20's, if they make the engines 'disappear'
drag-wise by keeping them going a bit above idle speed.

Remember the 'Gimli Glider', the Air Canada B767, that ran out of fuel?
There is a nice write-up at http://www.wadenelson.com/gimli.html
The author states a 11:1 for this 132t glider with two wind-milling P&W
engines and a RAT hanging out of it's belly.

Just out of curiosity - does anyone have a number for the space
shuttle?

Uli Neumann
Libelle 'GM'

In article ,
"For Example John Smith" wrote:

Found a number of docs that refer to it as 22 degrees at 360mph
I've understood it to be about 4:1, but I don't do much math so I can't
convert the 22 degrees into a L.....

The number I saw was 18 degrees at approach speed, which is about 200
knots. That's 3:1. 22 degrees is 2.5:1.

To go from the angle to the glide ratio calculate 1/tan(angle).

--
Bruce | 41.1670S | \ spoken | -+-
Hoult | 174.8263E | /\ here. | ----------O----------