AVSIG: Governor failure? wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Robinson

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Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Governor failure?
      #252739 - 06/27/09 04:54 PM

This morning I had an unusual "event". While doing my preflight checks the governor failed to come on. I recycled the circuit breaker and all was fine. No biggie. So I finished the preflight, loaded my photographer and headed off to Boston's Class Bravo.

Shortly after entering the Bravo I had a sudden and dramatic increase in rotor and engine speed, with both tachs heading rapidly for the red line. I turned off the governor, rolled the throttle back to the top of the green (its proper position), turned around and told BOS ATC I was returning to BED.

I had to keep positive throttle in order to keep the rotor/engine RPM from drooping. It would have continued down into the yellow arc if I hadn't kept hold of it. Fortunately I learned to fly before governors so it wasn't too difficult, although I was a little concerned about having to manually keep the throttle turned up. Interestingly, BED who knows I'm usually gone for a half hour or more asked me if I needed assistance when I made my radio call about returning to BED. I guess it was my phraseology about "returning" that triggered the question.

Landed okay. Called my mechanic who is coming up on Monday to look at it. He is going to look at the mags and the points as well as the governor.

I'll be interested to see what he finds. In the meantime I had an unhappy photographer who couldn't get his flight in. Shortly after we got back to BED the fog rolled in over the city, so even the backup outfit he called couldn't do the work.

Anne

--------------------
You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937


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Ward Miller POU-NY
Top Gun


Reged: 05/05/04
Posts: 10508
Loc: New York
Governor failure? [Re: Anne Umphrey (KBED)]
      #252744 - 06/27/09 05:56 PM

Anne, if it ain't one governor messing up, it's another. <g>

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Ralph Hood
Top Gun


Reged: 05/06/04
Posts: 4257
Loc: Erwin, TN
Re: Governor failure? [Re: Ward Miller POU-NY]
      #252795 - 06/28/09 04:20 PM

<<Anne, if it ain't one governor messing up, it's another. <g>>>

Anne--

He's right--at least your helicopter didn't head off to Argentina!

--------------------
Ralph Hood
www.ralphhood.com


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Bill Bridges - 9S1
Top Gun


Reged: 05/17/04
Posts: 6008
Loc: 9S1
Re: Governor failure? [Re: Anne Umphrey (KBED)]
      #252847 - 06/28/09 10:22 PM

Anne,

Quote:

Fortunately I learned to fly before governors so it wasn't too difficult




By "govenor" do you mean that you do not have to control the engine/rotor rpm by increasing/decreasing the throttle as you raise and lower the collective?

Bill


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Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Re: Governor failure? [Re: Bill Bridges - 9S1]
      #252916 - 06/29/09 08:07 AM

Yes, the governor controls the throttle as you increase or lower collective. Unlike the Enstrom for example where every time you make a pitch change you have to roll on or roll off throttle.

This is a great help for a sensitive helicopter like a Robbie, but not so good when it tries to overcome another problem. It can mask some other issues. I'll keep you all posted after my mechanic takes a look at things.

There was no governor when I learned to fly so I don't have much trouble flying without it. However, it does take more concentration. <G>

Anne

--------------------
You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937


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sreyoB yrraL
AVSIG Member


Reged: 05/16/04
Posts: 9442
Re: Governor failure? [Re: Anne Umphrey (KBED)]
      #252930 - 06/29/09 10:35 AM

Is the governor required on the R22?

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Ralph Jones
Top Gun


Reged: 08/31/01
Posts: 21214
Loc: 4CO2
Re: Governor failure? [Re: Anne Umphrey (KBED)]
      #252953 - 06/29/09 11:48 AM

Governors have recently come into use on R/C helis too.

--------------------
Ralph Jones
LS-4a N49LS 6R


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Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Re: Governor failure? [Re: sreyoB yrraL]
      #252973 - 06/29/09 02:20 PM

It is now. You can only fly with it off "for purposes of training".

Anne

--------------------
You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937


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sreyoB yrraL
AVSIG Member


Reged: 05/16/04
Posts: 9442
Re: Governor failure? [Re: Anne Umphrey (KBED)]
      #253008 - 06/29/09 05:23 PM

That's interesting. Has that always been the case with the R22 or something that was added in response to some problems?

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Ray Tackett
Top Gun


Reged: 04/30/04
Posts: 8892
Loc: Philadelphia, USA
Re: Governor failure? [Re: Bill Bridges - 9S1]
      #253026 - 06/29/09 06:28 PM

Bill,

You're used to considerably more inertia in a rotor system than you find in a
Robinson R-22. Rotor RPMs can change very fast. For example, if the engine
quits or there's a driveline failure, you've got less than two seconds to put
a Robbie's collective on the floor. During the auto, rotor RPM is very
touchy. Try to gain or lose a bit of airspeed and watch the energy transfer
instantly to or from the rotor system.

A governor is a big help with that light rotor system.

Ray

--------------------
Ray,

Owner, Lake Wood Be Gone

Turning quality lumber into sawdust and noise since 2013.


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