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HelicopterMain Discussion › Full power on a tied up Heli ??? healthy ???
10-20-2004 01:46 PM  13 years agoPost 1
frasenci

rrNovice

Chile

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Hi guys

heard so many opinions on the matter and want to have a real expert advice......

Is it healthy for the heli to apply full power when having it tied down to a desk or something ?? For engine tuning , vibration analisis etc ???

What are the real drawbacks ??? if any.....

Thank you very much

Francisco
Chile

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10-20-2004 01:48 PM  13 years agoPost 2
Doug

rrElite Veteran

Port Saint Luice​Florida....

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Not a good Idea.

First member of Member of Bearings Anonymous

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10-20-2004 01:49 PM  13 years agoPost 3
sestcourt

rrVeteran

Berkshire, UK

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Why don't you just get a set of headloaders, that way the head still has a load on it and its a damn site safer than running main blades at high rpm on the ground.....

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10-20-2004 01:54 PM  13 years agoPost 4
daren

rrVeteran

Hampshire Sponsored​by Quick UK

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not a healthy idea, i had a raptor 90 tied down and it broke away one side and tipped over while at full throttle, can't say the neighbour was to happy about the big hole in his fence that the blades made.

never tie them down again, do my adjustments while flying

Daren
Using the ground to reverse engineer

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10-20-2004 02:11 PM  13 years agoPost 5
frasenci

rrNovice

Chile

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thank you !!!

" headloaders " ???????? what is this ???

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10-20-2004 02:20 PM  13 years agoPost 6
lozza6

rrVeteran

Sydney, Australia

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haha i was just thining of this.. for like headspeed fine tuning with throttle curves....

but now.. no.. i wont hahahahaha

Loz

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10-20-2004 02:22 PM  13 years agoPost 7
rwm01

rrApprentice

Winnsboro, TX

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Great item, not readily available outside of England. At least I haven't been able to find a "State Side" distributor, yet.

You can find out more about them here: http://www.freenetpages.co.uk/hp/da...oaders/What.htm

HTH,


.

No Honey, thats always been on my Heli.
I'd list what I have but then she'd have proof!

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10-20-2004 02:28 PM  13 years agoPost 8
rwm01

rrApprentice

Winnsboro, TX

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Here's a couple pictures 'pirated' from their web page . . .

HTH,

.

No Honey, thats always been on my Heli.
I'd list what I have but then she'd have proof!

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10-20-2004 03:22 PM  13 years agoPost 9
gt900uk

rrKey Veteran

Scotland

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surley if u set up negative pitch and a v curve u can do this on the ground without the heli taking off?

This Heli Will Self Destruct In Five Seconds!!

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10-20-2004 04:24 PM  13 years agoPost 10
Spitfire_mk5

rrKey Veteran

Canada

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Ground resonence!

someone post that vid of the chinook doing an engine run up while tied down.

That will get rid of this idea quickly.

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10-20-2004 04:32 PM  13 years agoPost 11
Drunk Monk

rrProfessor

Preston, UK

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surley if u set up negative pitch and a v curve u can do this on the ground without the heli taking off?
That's what I do but don't keep the neg on for more than a sec or 2 becuase of the stress it puts on the head. Full neg and the heli not moving will put a huge load on.


Stephen

I only open my mouth to change feet.....

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10-20-2004 04:37 PM  13 years agoPost 12
Jamovich

rrVeteran

Bangalore, India

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Hmm

Ya know what would be simpler?

The tried and true method of having someone else (or three for a 90 size) hold it ubove their head while you tune...has worked for me everytime...and it is a rush

Jamovich

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10-20-2004 04:40 PM  13 years agoPost 13
Salty

rrElite Veteran

St. Augustine

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if your trying to search vibe probs with the heli tied down you wont ever find the culprit, the heli was designed to be free and will create its own new set of vibes when you tie it down, this transfers to full scale as well, when we do vibe tuning on the full sized helicopter we unchain the aircraft from the deck, open the trap and the only thing we have retaining the helo is the chocks, we rough in the helo to fly on the ground then do the rest of the adjustments in flight (we obviously have to land and shut down if we have to mess with the rotor head) NOT GOOD TO TIE A HELI DOWN, I'm not a big fan of head loaders either...I believe (I have used headloaders) that you still arnt getting the proper effect of the main rotor system....I rough mine in and fly and adjust as I go

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10-20-2004 04:54 PM  13 years agoPost 14
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

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LMFAO

""Ya know what would be simpler?

The tried and true method of having someone else (or three for a 90 size) hold it ubove their head while you tune...has worked for me everytime...and it is a rush

Jamovich
"""

oh yea..lol

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10-20-2004 06:24 PM  13 years agoPost 15
gigi

rrVeteran

Port-au-Prince,​Haiti

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It's the worse thing you can do to your heli!

It will experience what is called "ground resonnance", and will likely self-destruct right under your eyes.

Do a seach for the term in quotes above. But in a nutshell, it's a tremendously bad idea, it's very dangerous, and it serves no purpose. Like others have said, rough it in, and fine-tune by flying, landing, making changes, and flying again.

I did it myself a couple of times, because I thought people who told me to not do it were afraid I didn't tie the heli down securely enough. The better it's tied, the more likely it will enter ground resonnance

Gigi

My heli spending has gone way down since I got a Honda 919 :-)

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10-20-2004 06:51 PM  13 years agoPost 16
RotorX

rrKey Veteran

London

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I do it the other way round i go into idle 1 and then i just go downon the stick and if the blades slow a little engine tuning is in order, once i get it close i then fly it and fine tune it

Tying it down and then trying to fly up sounds a bit mad - but its your call

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10-20-2004 06:51 PM  13 years agoPost 17
Graeme

rrApprentice

Jeffersonville, IN,​USA

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I did it - once!

I was running the throttle up and down, just to test, when I noticed a change in the sound of the main blades. I'd cracked both grips.

I noticed the change in sound when the throttle/collective was all the way up, and promptly shut it down to check - thank heavens. (It was a Nexus 30, but not the defective grips.)



Give a man a program and you frustrate him for a day; teach him to program and you frustrate him for life.

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10-20-2004 07:28 PM  13 years agoPost 18
sixeven

rrApprentice

Ft. Myers Florida

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BAD IDEA!

Not only for the before mentioned ground resonance which is correct but for another more severe problem.

As you take the rotor head up to full speed (and full pitch) the lead blade will produce significant cavitation and turbulance. The lagging blade then enters into that very rough air and will experience varying loads due to variable lift. The resultant extreme load changes could literally tear the heli apart.

In flight this phenomenon is minimized as the heli is usually drawing more stable air past the rotor system. However, when the heli is tied down, the air surrounding the rotor disk becomes "mixed" into a mess of turbulance and "bad propwash" Furthermore, if the tie down is on the ground the ground effect is reflecting the "propwash" and harmonic pressure pulses of the blades back into the rotor system.

BAD JUJU!

SiXeVeN

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10-20-2004 07:42 PM  13 years agoPost 19
G.Man

rrProfessor

Bristol

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I use 4 large cable ties and a Workmate...

Cable ties attach heli to workmate and headloaders fitted instead of blades..

Only gives you a rough set of needle settings but they are close...

its only for those non-flying days as flight testing is the only accurate way..

Don't Email me as I wont reply - PM Only (spam countermeasures)

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10-20-2004 07:45 PM  13 years agoPost 20
corey11

rrElite Veteran

Bay Area, California

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Not only for the before mentioned ground resonance which is correct but for another more severe problem.
ground resonance does not happen to two bladed helis...only 3 blades and up

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HelicopterMain Discussion › Full power on a tied up Heli ??? healthy ???
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