Tuesday, March 13, 2012

Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question



Good point about our theoretical disappearing gravity.  That may be a bad analogy to use to understand what is going on.  The reality is, the lift vector acts perpendicular to the relative wind.  The 'opposing gravity' lift vector is straight up (relative to the earth) only while in straight and level flight.  As soon as a climb begins by pulling back on the stick, the lift vector is tipped backwards and is pulling the aircraft in that direction.  As an example, when the flight path is straight up, the lift vector is not straight up relative to the earth, but is "up" perpendicular to the relative wind.  In this case, if the airplane is at this moment going straight up, the lift is parallel to the earth and opposite the initial heading when the maneuver started.  This pulls the airplane toward the center of the circle it is flying.  An outside loop is identical physics, except the stick is pushed instead of pulled.  So, the elevator provides the force that pitches the nose about the lateral axis and angles the lift vector aft to begin our loop, which could be described as curved flight.
 
 
 
 
Sent: Tuesday, March 13, 2012 1:08 PM
Subject: RE: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question
 
 

If the gravity vector is straight down and the opposing lift vector is straight up, without gravity why would we not simply climb? More explicitely, what angles the lift vector to the rear (or front) so we loop (or outside loop) instead of climb?

From: Sport_Aircraft@yahoogroups.com [mailto:Sport_Aircraft@yahoogroups.com] On Behalf Of James Bair
Sent: Tuesday, March 13, 2012 11:01 AM
To: Sport_Aircraft@yahoogroups.com
Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

The lift being created by the wing is counteracting gravity (weight).  If gravity were to suddenly disappear, we would start a loop immediately.  When we point the lift vector sideways, we begin being pulled in that direction by the lift the wing is creating. 

From: Bill Watson

Sent: Tuesday, March 13, 2012 12:50 PM

Subject: RE: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

Hey Jim, I have one for you (or anyone else that wants to play). If in straight and level flight, the main wing lift vector provides upness without looping our plane, why when we point the lift vector any amount sideways to we horizontal loop(turn)? eg: Why don't we continue to fly straight with only a sideways component to our flight?

Bill

From: Sport_Aircraft@yahoogroups.com [mailto:Sport_Aircraft@yahoogroups.com] On Behalf Of James Bair
Sent: Tuesday, March 13, 2012 10:37 AM
To: Sport_Aircraft@yahoogroups.com
Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

LOL.  Yes, or a checkride.  You are doing quite well, BTW.  What a surprise.  haha.

So far we have:

1. Turns are caused by a horizontal component of lift.

2. This lift is controlled by the elevator.

3. This lift amount, or quantity, can be positive, negative, or zero.

4.  The direction of lift, or the lift vector, is controlled by the ailerons.

One aileron goes up, the other down.  Does the sum total of aileron movement provide a net lifting force? Or simply a rolling force?  (2 questions at once.  Hope you aren't overloaded.)

From: Gary

Sent: Tuesday, March 13, 2012 12:03 PM

Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

This is like a bfr. I say the ailerons.

Sent from my Verizon Wireless 4GLTE Phone



-----Original message-----

From: James Bair <jimbair@live.com>
To:
Sport_Aircraft@yahoogroups.com
Sent:
Tue, Mar 13, 2012 16:50:50 GMT+00:00
Subject:
Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

So far we have determined that turns (in the horizontal is the matter under discussion.  Turns in the vertical can also occur.):

1. are caused by a horizontal component of lift.

2. This lift is controlled by the elevator.

3. This lift amount, or quantity, can be positive, negative, or zero.

What control surface controls the direction the wings are pointed (i.e., the lift vector) in their possible range of right and left all the way from straight up to straight down and all angles between?

From: Gary

Sent: Tuesday, March 13, 2012 10:40 AM

Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

Yes

Sent from my Verizon Wireless 4GLTE Phone



-----Original message-----

From: James Bair <jimbair@live.com>
To:
Sport_Aircraft@yahoogroups.com
Sent:
Tue, Mar 13, 2012 13:46:55 GMT+00:00
Subject:
Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

Is it possible to control the lift the wing produces through a range from positive lift (lift in an upward direction relative to the top of the wing) to zero lift to negative lift (lift in a downward direction relative to the bottom of the wing.) by moving the elevator?

From: Gary N Orpe

Sent: Tuesday, March 13, 2012 3:49 AM

Subject: RE: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

Elevator

Gary

From: Sport_Aircraft@yahoogroups.com [mailto:Sport_Aircraft@yahoogroups.com] On Behalf Of James Bair
Sent: Monday, March 12, 2012 10:45 AM
To: Sport_Aircraft@yahoogroups.com
Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question






I'll buy that.  I am trying to develop a method for teaching this concept to students and I need a willing participant.  What I would like to try is asking a series of questions and see where it takes us.  But I need a participant with an open mind and a desire to learn or if he already knows the answer, help others learn.  So, if you're game I'll ask some questions.  If you're not, just don't answer. 

What control surface controls the amount of lift the wings produce?

From: Gary

Sent: Monday, March 12, 2012 11:41 AM

Subject: Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

Horizontal components of lift

Sent from my Verizon Wireless 4GLTE Phone



-----Original message-----

From: James Bair <jimbair@live.com>
To:
Sport_Aircraft@yahoogroups.com
Sent:
Mon, Mar 12, 2012 16:27:09 GMT+00:00
Subject:
Re: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

Gary,

I am curious.  What do you believe makes airplanes turn?  You do not need to mention any particular flight control in your answer if you don't wish to.  If you wish to, that is fine, too.

Jim Bair

From: Gary N Orpe

Sent: Monday, March 12, 2012 11:15 AM

Subject: RE: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question

 

I never mentioned the elevator

Gary

-> -----Original Message-----
-> From: mailto:Sport_Aircraft%40yahoogroups.com
-> [mailto:mailto:Sport_Aircraft%40yahoogroups.com] On Behalf Of Michael Huckle
-> Sent: Monday, March 12, 2012 8:17 AM
-> To: Sport Aircraft
-> Subject: Light-Sport Aircraft Yahoo group Re: Answer to Rich's Question
->
->
->
-> > Posted by: "Gary N Orpe" mailto:garyo%40bak.rr.com
-> > Can anyone actually do this turn thing? Amazing.
-> > Hahaha ;-)
-> > Gary
->
->
-> ;-)
-> Yes, try it for yourself Gary.....
-> Fly North, and then turn either Northwest or West.
->
-> (see if the elevator is your primary turn control) (I'm betting it's
not.)
->
->
-> Mike
->
->
->
-> .
->
->
->
->
->
->
-> ------------------------------------
->
-> Yahoo! Groups Links
->
->
->








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