Mike is absolutely correct.

When you perform a properly executed barrel roll you should feel 2 to 3 g's.
This would be 1-2 g's more than normal.

In this case 'normal' is considered 1g, which as Mike explained what we feel
in unaccelerated flight, just like what you normally feel while sitting in a
chair at your computer.

I worded my post incorrectly and should have said "if performed properly,
you may well not pull more than 2 gs."

Barrel rolls are not difficult by any means, however if you have never done
one and you pull back to much in the wrong place, you will be far exceeding
Vna, and possibly Vne before you can say "whoops".

PJ

============================================
Here's to the duck who swam a lake and never lost a feather,
May sometime another year, we all be back together.
JJW
============================================

"mike regish" wrote in message
news:IMWwd.281811$R05.44863@attbi_s53...
You will always pull more than 1 g coming out of a roll. If you don't pull
it coming out of the roll, you will have to pull more than 1 g at some
point
to come out of the resulting dive unless you want to hit the ground. You
can
stay well within the limits if the airframe, but you can go beyond them
pretty easily, too. 1 G is unaccelerated flight-either straight and level
or
in a steady climb or descent. You have to pull up slightly to begin the
roll
and you will go to less than 1 G when you're inverted to more than 1 G
when
you roll upright and return to level flight.

I did some aerobatics in a Decathlon and what surprised me the most doing
my
first barrel roll was how slow it was. I thought I would just whip around
it
and be done with it, but it took some time to get all the way around. Even
snap rolls were pretty slow. This would no doubt be longer in a 172 with
what I'm pretty sure is a significantly slower roll rate than a Decathlon.
It's the reason I won't try them in my Tripacer. That would be WAY slow
going around and would probably result in more G's coming out.

mike regish


"PJ Hunt" wrote in message
...

As for the roll, depending on what type of roll you're performing, you
may
well be not pulling more than 1G at anytime if done properly.

Of course I'm not suggesting that you go out and test this.

PJ