90 degree turn
 

Hi,

Does a 90 degree turn exist......What happens to the forces in a turn after 75 degrees.....


Thanks
Mucky

Re: 90 degree turn
 

I suspect you mean bank, Mucky, not turn.

Plenty of 90 degree turns.

Re: 90 degree turn
 

Hmm. Not sure I understabd the question but I'll take a stab at: The Attitude Indicator will show an underbank and a pitch up.

Re: 90 degree turn
 

Muck,

I think what you are asking is if it's possible to turn with 90 degrees angle of bank?

If that's the case you might consider asking the question in the Private Flying forums, since this is an aerobatic move and there are plenty of people in there who fly aerobatics and would be able to answer your question. As I understand it, though, the lift from the wings would be entirely horizontal, and therefore not counteract the weight at all. However, the fuselage of the aircraft will actually generate a small amount of lift - in some aircraft, enough to counteract the weight. Since up/down with reference to the ground now corresponds to left/right with reference to the pilot, it is the rudder which is used to control the angle of attack. I'm not an expert, though.

FFF
---------------

Re: 90 degree turn
 

Cheers.... Sorry I badly phrased the question..

I ment If you bank 90 degrees in a turn trying to keep constant alt and speed what will happen + where will forces act

90 bank turn (Merged)
 

If you bank 90 degrees in a turn trying to keep constant alt and speed what will happen + where will forces act

Re: 90 bank turn
 

:eek: Down laddie, Down.

Re: 90 bank turn
 

Way, way down... there being no horizontal lift component to keep you at the same altitude. If you're thinking of how aerobatic aircraft do it, it's combination of fuselage lift, thrust and a lot of top rudder. Since only aerobatic aircraft are cleared for that kind of asymmetric tail loads, stay away from that flight regime - you'd probably be safer doing a barrel roll!

Re: 90 bank turn
 

By trying to maintain constant altitude, you will be pulling mighty hard on the yoke/stick and will stall, with the natural (and fairly dramatic in that configuration) consequences of that.

Re: 90 bank turn (Merged)
 

Muck - Pprune rules of engagement:

1 subject = 1 thread, on ONE forum.

Re: 90 bank turn (Merged)
 

It should be possible with a sufficiently powerful aircraft, given that knife edge "level flight" is easily doable in, say an, Extra 300. Absolutely no chance in anything less.

There's one stunning video clip I've seen where Jurgis Kairys does a low pass, knife edge. The video is taken, 50ft or so above ground, from a grandstand at racetrack in Japan. He passes *below* the camera position. :eek:

Forward airspeed is very low in these scenarios, as the aircraft is partly 'helicoptering' (aka 'prop hanging'), rather than flying on the fuselage & rudder alone.

Re: 90 bank turn (Merged)
 

Re: 90 degree turn
 

Yep, easy in a Pitts S-1.

Re: 90 bank turn (Merged)
 

BEagle....and the relevance of that to this thread...is...?

Re: 90 bank turn (Merged)
 

Re: 90 bank turn (Merged)
 

Who cares - I still want a go in a Buccaneer!

The Pitts can maintain a knife-edge straight & level, never tried to
actually *turn* in a knife-edge.

Re: 90 bank turn (Merged)
 

Yes, but hardly a level manouver:E

Re: 90 bank turn (Merged)
 

There was link on PPRuNe yonks ago to a video clip of a large mil aircraft which obtained almost that angle of bank - with such catostrophic (and fatal) results.

The aircraft (N American?) possibly a B52 was at a display when the accident happened - a graphic illustration which clearly showed what happens when all lift is lost.

Re: 90 bank turn (Merged)
 

Well modded, Keygrip

Not quite, if in knife edge, power is able to overcome the quite significant high drag. Otherwise, correct.


..and yes, it was a B52

Re: 90 bank turn (Merged)
 

Damn you!, and your perfectly neutral elevator control. :ok:

[edit: changed aileron to elevator)