Barrel Rolls

Interested in aerobatics or information on an airshow place your topics here.

Moderators: ahramin, sky's the limit, sepia, Sulako, lilfssister, North Shore

Post Reply
User avatar
Colonel Sanders
Top Poster
Top Poster
Posts: 7513
Joined: Sun Jun 14, 2009 5:17 pm
Location: Over Macho Grande

Barrel Rolls

Post by Colonel Sanders » Sun Jul 07, 2013 10:49 am

There are many different kinds of rolls, which often
confuses people. Aileron rolls. Slow rolls. Snap
rolls. Torque rolls. Point rolls. My buddy Spencer
even offers up airborne bagels and croissants.

http://www.youtube.com/watch?v=zXSddxS3q7k

Many people don't really grok barrel rolls. This
footage from yesterday evening shows it a bit,
from two vantage points:

http://www.youtube.com/watch?v=cckPLyUS0-4#t=163s

I love the rearward-facing view! Freddy would be proud.
---------- ADS -----------
  

User avatar
Colonel Sanders
Top Poster
Top Poster
Posts: 7513
Joined: Sun Jun 14, 2009 5:17 pm
Location: Over Macho Grande

Re: Barrel Rolls

Post by Colonel Sanders » Sun Jul 07, 2013 12:58 pm

Doing barrel rolls around the lead (with nose to
tail clearance, for safety) actually has a very good
use. It's not just a Stupid Airshow Trick (tm).

When doing a joinup on the lead, three things can
happen:

1) you end up behind the lead. Common error -
you are aiming at the lead, instead of in front of
him - you must "lead the lead", as it were.

2) you slide up into position perfectly on inside
echelon (yeah, right) with exactly matching energy.

3) you have much more energy than the lead,
and when you slide up to his altitude, you have
quite a speed delta on him. As briefed, what you
do for safety is stick forward and slide underneath
and outside and above the lead.

However. If you get the hang of this formation
aerobatic thing, it is great fun to take an enormous
run at the lead and intentionally overshoot. Slide
underneath him, with a little nose to tail clearance,
and start doing a barrel roll towards and around him,
and plop down into position on the inside echelon,
as you originally intended.

That has got to be one of the Top Ten Funnest
Things You Can Do With Your Pants On (tm).

Joinups are enormous fun, and actually have
nothing to do whatsoever with the discipline of
close formation.

I love front quarter rejoins. A few flights back,
Eric and I were rejoining. I was significantly
above him, and I was approaching from his
2 o'clock. So, I pitched up to lose airspeed,
half-rolled inverted, and did a split-S below
and behind him. It's a bit tricky to get the
timing right because of the closure speed,
but I ended up below Eric at his 5 o'clock
with a bucket of speed on, so I just slid up
into position.

That's what I love about this aviation thing.
No one knows it all, and there is so much
to learn :wink:
---------- ADS -----------
  

User avatar
AirFrame
Rank (9)
Rank (9)
Posts: 1924
Joined: Sun Oct 11, 2009 10:27 pm
Location: Sidney, BC
Contact:

Re: Barrel Rolls

Post by AirFrame » Sun Jul 07, 2013 3:11 pm

I like the roll-on-rejoin manoeuver. One of my formation instructors referred to that as a "Lag Roll Rejoin"... I think because it causes you to "lag" back behind lead (presumably, you've come in with too much smash, and this drops you back a bit?). No idea what the origin of the term is. I haven't tried it as we're not doing any inverted manoeuvers in formation... (yet).
---------- ADS -----------
  

User avatar
Colonel Sanders
Top Poster
Top Poster
Posts: 7513
Joined: Sun Jun 14, 2009 5:17 pm
Location: Over Macho Grande

Re: Barrel Rolls

Post by Colonel Sanders » Sun Jul 07, 2013 9:04 pm

Correct. The roll around the lead (as shown in the video)
results in the wing travelling a far greater distance than
the lead. This compensates for the extra energy of the
wing.

For some fun: http://en.wikipedia.org/wiki/Basic_figh ... g_scissors

Do recall the fundamental difference here ... in formation,
the lead is trying as best he can, to allow the wing to rejoin.
He does that by performing a gentle turn.

However, during air-to-air, the "lead" (defender) will violently
maneuver to stop the "wing" (attacker) from being able to
maneuver into position.

Big difference!
---------- ADS -----------
  

cbty
Rank 1
Rank 1
Posts: 40
Joined: Wed Dec 19, 2012 6:40 am
Contact:

Re: Barrel Rolls

Post by cbty » Mon Feb 03, 2014 7:24 pm

A barrell roll is a manoeuvre I am not sure to have fully understood how to manage.
---------- ADS -----------
  

User avatar
Colonel Sanders
Top Poster
Top Poster
Posts: 7513
Joined: Sun Jun 14, 2009 5:17 pm
Location: Over Macho Grande

Re: Barrel Rolls

Post by Colonel Sanders » Tue Feb 04, 2014 10:20 am

Many aerobatic maneuvers, weirdly enough,
involve instrument flying. For example, you
might want the entry and exit altitudes to be
the same.

Similarly, a barrel roll can be difficult to visualize
and fly, without visual references.

Watch this:

http://www.youtube.com/watch?v=wtaFzFkohPU

My son flies straight and level, with the smoke
on, and I do barrel rolls around him. You can
see what the maneuver looks like, from both
inside and outside the cockpit.

Imagine there was a large tube, that my kid
was flying through the center of. And I am
driving around the inside of the tube, spiralling
away.
---------- ADS -----------
  

Post Reply

Return to “Aerobatics & Airshows”