Why does the shuttle throttle on ascent?

MichaelJP wrote:
Thanks Pat - the ME-163 is modelled in the superb combat flight sim IL-2,
trying it last night they must have modelled this aircraft quite nicely as I
found it very difficult to bleed off enough speed in the hold-off, exactly
as you said above. Landing on the grass the skid dug in and certainly a real
aircraft would have been destroyed.

Obviously somebody did their research when writing the program for it.
It might have something to do with the fact tat the ailerons also serve
as its elevators.
Does the simulator have the spoilers on it?
The controls for them are located just to the left of the control stick.
There's a manual pump mechanism handle with a ball top, and to the rear
of it the actual flap control lever.
On the actual aircraft you turn the control handle 180 degrees, then
pump the pump handle six times to put the flaps fully down.
Difference is I could reset for another go

Doing some other testing I found it impossible to recover from a spin
entered from a slow-speed stall. Wonder if that's correct?

It's supposed to have a very abrupt and severe stall according to Eric
Brown's flight notes; he states it goes into a steep spiraling dive, but
you can recover from it in a "straightforward" manner. I don't know it
that means you turn into the spin and convert it into a dive or what.
BTW, he was able to get the one he was flying up to 440 mph in _gliding_
flight in a dive, which gives you some idea of just how aerodynamic this
little thing was.
He wrecked his Komet by doing progressively faster and faster ballasted
landings as tests for a British high speed research aircraft that the
RAF was planning, till the skid finally came through the floorboard of
the cockpit after a landing at 158 mph.

Pat

Greg D. Moore (Strider) wrote:

He only snapped chalk? You're lucky.

I had a Latin teacher that would throw it... very quickly... at the
blackboard behind your head.

THAT got your attention.



The nuns were fond of throwing erasers _at_ your head, and some of them
were made partially of wood.

Pat

On Fri, 12 Jan 2007 22:12:42 -0600, in a place far, far away, Pat
Flannery made the phosphor on my monitor glow in
such a way as to indicate that:



Greg D. Moore (Strider) wrote:

He only snapped chalk? You're lucky.

I had a Latin teacher that would throw it... very quickly... at the
blackboard behind your head.

THAT got your attention.



The nuns were fond of throwing erasers _at_ your head, and some of them
were made partially of wood.

Was your head one of those? It would explain much.

In article ,
Pat Flannery wrote:
The big reason why you might need tank insulation is if the tank holds
LH2, in which case you need to insulate to prevent liquid air from
condensing...

In the case of a carrier aircraft, the airstream should carry away any
liquid air on the tank.

With any luck, assuming it doesn't go somewhere it shouldn't... but the
condensation will still produce a massive heat flux into the LH2 tank, and
it doesn't take much to boil LH2.
--
spsystems.net is temporarily off the air; | Henry Spencer
mail to henry at zoo.utoronto.ca instead. |

Derek Lyons wrote:

There can be attitude transients caused by hydrodynamic effects of the
passage through the water as well as the effects of breaking the
surface. ('Tail slap' as the missile exits is of particular concern.)
Polaris was acutely sensitive to this because of their need to perform
a roll maneuver immediately upon ignition.


I noticed when I went looking for Polaris launch photos that they seem
to exit the water at angles in quite a few cases.
The first Trident test at Cape Kennedy took off a quite an angle:
http://commons.wikimedia.org/wiki/Im...rst_launch.jpg

In the early days they even tested a set of flow velocity sensors
mounted on the SSBN to attempt to predict wave action and the
calculate the best moment for launch!

They do tend to fly a steeper trajectory than is usual as well.
Partly to encourage seperation between birds (which are being salvoed
at short intervals) and partly as a safety measure to the get the bird
away from the boat as soon as possible.

I would have loved to have been there when the crew of sub saw film of
this for the first time:
http://hometown.aol.com/sdrcgeru/ima..._cartwheel.jpg :-)

Pat

Derek Lyons wrote:
That's one launch out of many Pat. I've seen pictures of a Polaris
coming out at about 30 degrees from vertical.


Actually if you watch that, it's a salvo launch of two missiles.
And yes, I've seen photos of Polaris coming out of the water at an
angle, then strightning out after motor igniton; in this case the
Trident comes out straight, then pivots over on motor ignition, as it
sets itself on its ascent trajectory at only a few hundred feet in the air.


Pat

Pat Flannery wrote:
Derek Lyons wrote:

There can be attitude transients caused by hydrodynamic effects of the
passage through the water as well as the effects of breaking the
surface. ('Tail slap' as the missile exits is of particular concern.)
Polaris was acutely sensitive to this because of their need to perform
a roll maneuver immediately upon ignition.


I noticed when I went looking for Polaris launch photos that they seem
to exit the water at angles in quite a few cases.
The first Trident test at Cape Kennedy took off a quite an angle:
http://commons.wikimedia.org/wiki/Im...rst_launch.jpg

That pictures seems to show a land launch from Launch Complex 25 at
Cape Canaveral Air Force Station, which might . . . I emphasize might
.. . . suggest that the initial non vertical climb is how the vehicle
is designed to perform . . . interesting *S*

Blue skies

John

I would have loved to have been there when the crew of sub saw film of
this for the first time:
http://hometown.aol.com/sdrcgeru/ima..._cartwheel.jpg :-)

Pat

Imagine the orders given . . . IF . . . the CO of that boat had any
idea of what going on above their heads . . .

perhaps the phrases "ahead," "flank" and "screw the telemetry mast"
figured into the conversation.

Blue skies

John

Pat Flannery wrote:

Derek Lyons wrote:

They do tend to fly a steeper trajectory than is usual as well.
Partly to encourage seperation between birds (which are being salvoed
at short intervals) and partly as a safety measure to the get the bird
away from the boat as soon as possible.

I would have loved to have been there when the crew of sub saw film of
this for the first time:
http://hometown.aol.com/sdrcgeru/ima..._cartwheel.jpg :-)

Knew a guy who was there - they had just enough time (after launch) to
start to congratulate themselves when *boom*. The self destruct shook
the boat.

D.
--
Touch-twice life. Eat. Drink. Laugh.

-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL

On Fri, 12 Jan 2007 19:55:43 GMT, (Derek Lyons)
wrote:

There can be attitude transients caused by hydrodynamic effects of the
passage through the water as well as the effects of breaking the
surface. ('Tail slap' as the missile exits is of particular concern.)
Polaris was acutely sensitive to this because of their need to perform
a roll maneuver immediately upon ignition.

Coincidentally, History Channel this morning ran a show about the ICBM
Race and included Polaris launch footage. That roll was damned
impressive!

Brian