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HeliTorque :: View topic - Loop in a Helicopter !
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HeliTorque Forum Index » Flight Dynamics

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JBL
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PostPosted: Sun Jan 29, 2006 9:06 pm    Post subject: Loop in a Helicopter ! Reply with quote

So what exactly are the control inputs you need to make to achieve a loop and a barrel roll in a helicopter ?!!! Confused Not PLANNING on doing it just yet!

http://www.datacustoms.com/pprune/Bell407Loop.wmv

JBL
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fun_police
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PostPosted: Mon Jan 30, 2006 1:02 am    Post subject: Reply with quote

i'm really not sure and i cannot help, in spite of myself, but be impressed at that display of flying. just remember because that was outside of the flight testing envelope bell helicopter pulled the certificate of airworthiness for that aircraft. now whoever shelled out approx 1.7 mil (US) for that a/c has one heck of a lawn ornament Sad .
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weekend warrior
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PostPosted: Mon Jan 30, 2006 1:40 am    Post subject: Reply with quote

.

Last edited by weekend warrior on Wed Jun 07, 2006 10:01 am; edited 1 time in total
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WhirlyGuy
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PostPosted: Mon Jan 30, 2006 2:20 am    Post subject: Reply with quote

Hmmm. Would love to loop a heli one day. Probably the most difficult thing to do I would imagine. Also I am pretty sure that you need a rigid rotor system to be able to do that though. Hmm is a 407 rigid or not (scratching head....).

That pilot is either exceptionally talented or if not then very silly as I am sure to do a loop it must take hundreds if not thousands of hours to do them properly. He / She looked very stable though. Thought it might be a military person?

See ya.

W-GUY
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crashresidue
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PostPosted: Mon Jan 30, 2006 5:49 am    Post subject: Reply with quote

Cheers all,

Now, I'm NOT admitting to anything like this - - but- - - .

Doesn't have to be rigid rotor, I saw a H-500 looped and rolled.

Our "hard target enrty" in Cobra's(G models) was the first half of a split "S". Over the target, 20 lbs torque, full left pedal, roll hard right, she'd go inverted, slight aft cyclic and you're verticle - seven seconds "on target" (IAS passing 200 kts) again slight aft cyclic and begin the pull out.

I did this once from 3,000' AGL and came back with leaves in the mini-gun and some VERY large eyes. The front seater was NOT a happy camper!

I don't have the videos, but there is a great one with a BO-105 doing things I haven't figured out and another with a pair of H-53's doing slow rolls.

Yes, it can be done - but why take the chance of pulling the rotor off?

180 autos ought to make your bp spike enough to be happy.

Genlte winds,
Russ
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JBL
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PostPosted: Mon Jan 30, 2006 6:23 pm    Post subject: Reply with quote

Thanks Russ, that sounds pretty impressive - how long did it take to learn ?!

There are some other great (?!) examples of flying at http://www.griffin-helicopters.co.uk/videos/

Be aware you need a good broadband link for some of them.

JBL
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Heli-Ops
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PostPosted: Mon Jan 30, 2006 6:51 pm    Post subject: Reply with quote

Hey Russ do I get to see you do that in your 212 if I stop by the fire base Laughing
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DBChopper
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PostPosted: Mon Jan 30, 2006 8:55 pm    Post subject: Reply with quote

Loops?

Rolls?

Look, I did far scarier manouevers than that duirng my trial lesson in the R22. Of course, then the instructor regained control...

Twisted Evil
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PostPosted: Mon Jan 30, 2006 10:19 pm    Post subject: Reply with quote

Smile
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crashresidue
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PostPosted: Thu Feb 02, 2006 9:36 am    Post subject: Reply with quote

Cheers Ned,

Sure, I'll show you how to do it - and then YOU can put out the fire - but remember, this one is going to have a magnisium (sp?) fuel base. About 6500 #'s worth, plus a little AvTur to help it spread.

Sorry, but at my age, anything over 45 degrees is going to be something I do as a LAST resort - just before the impact!

If I can find the video link for the BO-105, I'll get back here with it - it's AWSOME!

Gentle winds,
Russ
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PostPosted: Thu Feb 02, 2006 9:51 am    Post subject: Reply with quote

Hi there Russ,

Is this the one you mean?

http://www.trkheli.com/helicopter_videos.html

Direct Link
mms://wms.e-tv.de/tvtotal/2005/03/21/0698-00-06-wm_midband.wmv

Don't know if the second link will play from directly in a browser but if you open up Windows Media Player first and then go to File -> Open Url (or something like that) then you should be able to post that URL in and it should play. Otherwise it is the first link on the html page link.

Best wishes,

W-GUY
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Hughes500
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PostPosted: Thu Feb 02, 2006 3:16 pm    Post subject: Reply with quote

Heard about 3 loops in succession in a 500. Pilot said no problem until engineers pointed out that he had broken 18 plus straps in the head ! Expensive 3 loops - overhauled head about
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BigMike
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PostPosted: Thu Feb 02, 2006 8:46 pm    Post subject: Reply with quote

The 500 can be looped and rolled. Kawasaki Heavy Industries (KHI) which used to produce the 500 under licence, demonstrated loops as part of there sales program in the early days. Factory engineers stated that no more than 2 G's was involved.

MD Test pilot, Rich Lee also performed these aerobatics in a factory demonstrator. I believe the 500 was originally going to be certified for aerobatics but it was put in the too hard basket.
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SuperF
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PostPosted: Fri Feb 03, 2006 10:05 am    Post subject: Reply with quote

great video sites. I've been looking for the 407 vid since the Bell guys told me about it. They were "sort of" using it as a sales gimmick. They reckon that the pilot did such a good job at the airshow that he must have done quite a few before the day...

Ned, you will get one loop or roll out of a huey. make sure your will is up to date and you have good life insurance... Shocked

Have heard of quite a few NZ 500 pilots who have done it
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biskit
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PostPosted: Fri Feb 03, 2006 3:43 pm    Post subject: Reply with quote

Nearly anything with a rigid or articulated rotor can be rolled/looped or flown in a variety of positive G maneuvers upside down. Inverted pictures of dozens of types of helicopters are readily available online, videos too sometimes.

I'm interested in seeing pictures or video of a semi-rigid or tandem/coaxial rotor helicopter inverted, please post it if you have such media!
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