Rolling a 172 - or not

Robert

You talk about doing a LOOP in association with a roll. A LOOP has no
roll in it.The ailerons are only used to keep the wings 90 degrees to
the plane of the loop. A IMMELMAN or CUBAN EIGHT has a roll
associated with part of a loop.

The description of making a corkscrew inside a tube is another way of
defining the flight of the airplane when it does a BARREL ROLL.

In my prior post I said to pull one 'G' when I should have said two
'G'. Same 'G' as pulled in a one 'G' turn (one gravity 'G' and one
acceleration 'G').

Not sure you would or would not call a barrel roll a compition
maneuver. Never flew in compiton. In the airshows we used to put on
didn't do BARREL ROLLS becaue they were not very spectular from the
ground nor percicsion manuevers..

In airshows many times we would do a 8 point SLOW ROLL stoppmg
momentarily every 45 degrees of roll. This is a precison maneuver and
takes a lot of practice with elevator, rudder and aileron in
coordination to do correctly and with precision so looks good from
ground. Seen in compition today.

My reference is years and years of doing acrobatics and teaching same
in both conventional aircraft and jets.

As a matter of interest, most of the victory rolls you see of Fighters
returning from a combat mission with kills are aileron rolls. You
could see some (rare) put a little forward stick in when inverted but
had to look close.

Some birds didn't do good aileron rolls (P-51 for instanace) If you
did an aileron roll on the deck you normally bumped the stick upside
down to keep the nose up. The P-40 however aileron rolled like a spool
on a thread.

Big John


On Sun, 09 Nov 2003 03:55:51 GMT, Robert Moore
wrote:

Big John wrote
1. A 'barrel roll' is a roll where (if done properly) you as a
passenger, with your eyes closed, can not tell you did a roll.
The ball stays centered and if one 'G' is maintained, it feels
like straight and level flight. Starting nose position and of
course air speed varies between underpoweed GA aircraft and
super sonic Fghters.

Hey John, I didn't make-up that post, it came straight from:

http://acro.harvard.edu

The Barrel Roll is a not competition maneuver. The barrel roll is a
combination between
a loop and a roll. You complete one loop while completing one roll at
the same time.
The flight path during a barrel roll has the shape of a horizontal
cork screw. Imagine a big
barrel, with the airplanes wheels rolling along the inside of the
barrel in a cork screw path.
During a barrel roll, the pilot experiences always positive G's. The
maximum is about 2.5 to
3 G, the minimum about 0.5 G.

Care to give us a reference for your definition?

Bob