Barrel roll

[rvbuilder2002]

Originally Posted by cwilkins

Pardon my ignorance here, but what’s the big deal about a barrel roll? Essentially, it’s a 1g maneuver which makes it pretty benign. While I would agree that you wouldn’t want to go out and do snap rolls and outside loops in an RV-9, what’s the danger of doing something as docile as a barrel roll?

I guess I need to do some aerobatic learning because I have always understood a barrel roll to be a roll maneuver which is using pitch input to scribe a corkscrew pattern through the air which when done properly is a 100% 1G maneuver.

Your right. Properly done it is benign. But if someone with low or no experience does one and things go bad, they can go very bad in a hurry.
An airplane rated for aerobics will have a much larger safety margin to help the pilot sort it out.

[AIR HOG]

https://youtu.be/Ra_khhzuFlE?t=61

Technically, a barrel roll has very similar G loading to an inside loop. 3 to 3.5 on the pull up and pull out of the loop portion. Almost no G at the top.

Only an aileron roll properly done is a 1 G to a zero G load and back to 1 G.

[luddite42]

Originally Posted by rvbuilder2002

I guess I need to do some aerobatic learning because I have always understood a barrel roll to be a roll maneuver which is using pitch input to scribe a corkscrew pattern through the air which when done properly is a 100% 1G maneuver.

That's not the traditionally accepted meaning of "barrel" roll. If it was, there would be no difference between saying "barrel" roll and "aileron" roll.

[rvbuilder2002]

Originally Posted by luddite42

That's not the traditionally accepted meaning of "barrel" roll. If it was, there would be no difference between saying "barrel" roll and "aileron" roll.

I think my post already indicated that I understood that (now) but to me there still can be a difference. What I described is not constant altitude. What I (now I know incorrectly) understood to be a true aileron roll scribes a perfectly straight longitudinal line while rolling which has to include something less than 1G while inverted.

[mattsrv7]

Aileron roll: pull nose up, neutralize pitch input, aileron only and nose drops, close to 1G through rolling

Slow roll (IAC competition name): flight path constant, -1G inverted with constant rudder, elevator, and aileron input changes for a constant flight path and roll rate.

Barrel roll as others have said, combination of loop and roll with ~3G pull into a loop at the entry

https://www.iac.org/legacy/aerobatic-figures

[swjohnsey]

I wonder who the first guy was to do a roll?

[luddite42]

Originally Posted by rvbuilder2002

I think my post already indicated that I understood that (now) but to me there still can be a difference. What I described is not constant altitude. What I (now I know incorrectly) understood to be a true aileron roll scribes a perfectly straight longitudinal line while rolling which has to include something less than 1G while inverted.

Yeah too many rolls terms to cross up - barrel, aileron, slow, ballistic, lobster, etc. The only one that has real standards is the one where your flight path maintains straight and level as you roll, which should see a perfect +1G to -1G transition. Some call this a "slow" roll, but in the competition world, it's just called an "aileron" roll, since there are only two types of rolls - aileron and snap, and aileron rolls must always be done on a constant line. In the recreational acro world, "slow" roll means the comepetition style roll, "aileron" means the pitched up positive (1G) roll, and barrel means looping and rolling together.

[jrs14855]

As i posted in another thread a few days ago, some time ago IAC tampered with roll terminology.
Maybe we could use Hoover Roll as a better way to avoid confusion. Most at some point have seen this roll performed in the Shrike Commander as well *** several other types. Hoover did the roll on at least one occasion while pouring ice tea with the airplane inverted for the camera. No significant heading displacement, positive G all the way around.
A barrel roll changes heading either 45 degrees or 90 degrees(military) and as previously noted involves approximately as much G load as a loop.

[AIR HOG]

Originally Posted by swjohnsey

I wonder who the first guy was to do a roll?

I think his name was Adam.

[AIR HOG]

Originally Posted by FNG

I don't want to start a fight, but has anyone here tried a barrel roll in their RV-9?

It feels like it would be easy..

[ed. The RV-9/A is not approved for aerobatics, and a lot of FAA I.P. addresses visit this site daily. If you want to admit online to doing acro in an RV-9/A, let me know how that works out ;^). v/r,dr]

Best to talk your wife into letting you spend a few hours with Patty Wagstaff in Florida. Lots of ways to skin a cat, but you don't want to de skin your 9 or even wrinkle it.

I have never known anyone that took aerobatic flight training with Patty that felt it was anything other than a really great use of time and money.
One of her instructors used to own an RV.