Turn to Final - Keeping Ball Centered

On Mar 13, 11:14*am, "Capt. Geoffrey Thorpe" The Sea Hawk At Wow Way
D0t C0m wrote:


Note: as others are beating to death - stall speed doesn't change with bank.

Do you really mean that?

Cheers

"WingFlaps" wrote in message
...
On Mar 13, 11:14 am, "Capt. Geoffrey Thorpe" The Sea Hawk At Wow Way
D0t C0m wrote:


Note: as others are beating to death - stall speed doesn't change with
bank.

Do you really mean that?

Cheers

Yes, he does; and yes, he is correct.

You have gone back to thinking in only two dimensions; and therefore
ignoring the effects of vertical acceleration.

Just as a theoretically simple example; consider the case of an aircraft
flying around in a circle, but the circle is an inclined plane relative to
the surface of the earth--rather than being horizontal. In that case, since
we speak of bank angle relative to the horizontal (referenced to the earth
at that location) the G-load (and therefore the stall speed) will be
greatest at the point on the circle where the bank angle is least--and this
will remain true even in the special case where the aircraft is able to fly
around the circle at a constant speed.

Peter

On Mar 13, 4:33*pm, "Peter Dohm" wrote:
"WingFlaps" wrote in message

...

On Mar 13, 11:14 am, "Capt. Geoffrey Thorpe" The Sea Hawk At Wow Way
D0t C0m wrote:

Note: as others are beating to death - stall speed doesn't change with
bank.
Do you really mean that?
Cheers

Yes, he does; and yes, he is correct.

You have gone back to thinking in only two dimensions; and therefore
ignoring the effects of vertical acceleration.


Nope, the plane's vertical acceleration is 0 so all that matters is
that the lift must equal the weight. As the plane banks the lift
vector is no linger in line with the weight so the load factor is
increased by 1/cos(bank angle) and the stall speed is proportional to
the square root of the load factor. Or are we talking at crossed
purposes?

Cheers

"WingFlaps" wrote in message
...
On Mar 13, 4:33 pm, "Peter Dohm" wrote:
"WingFlaps" wrote in message

...

On Mar 13, 11:14 am, "Capt. Geoffrey Thorpe" The Sea Hawk At Wow Way
D0t C0m wrote:

Note: as others are beating to death - stall speed doesn't change with
bank.
Do you really mean that?
Cheers

Yes, he does; and yes, he is correct.

You have gone back to thinking in only two dimensions; and therefore
ignoring the effects of vertical acceleration.


Nope, the plane's vertical acceleration is 0 so all that matters is
that the lift must equal the weight. As the plane banks the lift
vector is no linger in line with the weight so the load factor is
increased by 1/cos(bank angle) and the stall speed is proportional to
the square root of the load factor. Or are we talking at crossed
purposes?

Cheers

Then we are clearly talking at crossed purposes, as all of us who are
separating stall speed from angle of bank are considering vertical
acceleration. The salient point is that, whether you are amking use of it
at any given moment, vertical acceleration downward is one of the tools that
is available. OTOH, from the airplane's point of view, acceleration upward
and deceleration downward are basically the same thing; so if you are trying
to stop a descent while banked, the load factor and stall speed can increase
dramatically.

All the best
Peter

"WingFlaps" wrote in message
...
On Mar 13, 11:14 am, "Capt. Geoffrey Thorpe" The Sea Hawk At Wow Way
D0t C0m wrote:


Note: as others are beating to death - stall speed doesn't change with
bank.

Do you really mean that?


Yup.

Bank is controlled by ailerons.

The angle of attack (which results in stalls) is controlled by the elevators
which don't cause the aircraft to bank.

No yank, no change in stall speed. If you do pull, you will increase the
stall speed - banked or not.

How do you do a snap roll? (flick roll if you are on the East side of teh
Atlantic)

--
Geoff
The Sea Hawk at Wow Way d0t Com
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