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R-22 massive overspeed

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Well here's another example of how manufacturures did something, at least, questionable?

 

I recently saw the tach from an Eagle helicycle. It has a vertical one like the R22, but unlike the R22 which has the engine on the left, rotor on the right, they decided to reverse that and put the rotor on the left...?

 

How about some uniformity guys!

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Uniformity in aviation? Rotsa ruck!

 

But...having said that...your collective is in your *left* hand, correct? The depiction on the Eagle Helicycle tach *does* kinda-sorta make sense. Maybe Frankie got it wrong?

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With regards to an autorotation’s, teaching a pilot to move the collective in response to a needle movement will place the pilot behind the 8-Ball. Increasing or decreasing RPM’s should be corrected before referencing the needles. Initial corrections are made through interpretation of vibrations and sound while correlating the conditions which will affect RPM, such as turning, then confirming the correction by the gauge…...

 

Funny enough, while having taught in both the R22 and the S300, I never even considered the difference in direction of needle movement until it was mentioned in this thread and apparently, my students didn’t either. Therefore, the lesson may be, don’t compare or it can lead to negative transfer of learning……

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Never did like the Robinson tach, two needle widths is the entire green arc. Should have incorporated an expanded scale where it counts.

 

Mike

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Never did like the Robinson tach, two needle widths is the entire green arc. Should have incorporated an expanded scale where it counts.

 

Mike

I agree with that one!

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The pilot is ALWAYS responsible for engine/rotor speed. The governor, if installed is only a device which makes it easier for the pilot to manage RPM but, like an autopilot device, when it malfunctions the pilot has to intervene and control the aircraft! A governor malfunction is NO excuse to have an overspeed.

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The pilot is ALWAYS responsible for engine/rotor speed. The governor, if installed is only a device which makes it easier for the pilot to manage RPM but, like an autopilot device, when it malfunctions the pilot has to intervene and control the aircraft! A governor malfunction is NO excuse to have an overspeed.

 

Then I suggest you NEVER take your hand off the throttle! Oh' yeah, good luck adjusting the carb heat, pulling trim, tuning the radio, adjusting the GPS, the VOR, scratching your nose, etc, etc, etc,... :rolleyes:

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a07o0030_photo_1.jpg

how old is that one? Looks like an HP tach...

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Sure looks like the engine needle won the battle but came away a bit bent!

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my 2c.

 

Only having 160 hr in R22's i can unfortunately say that early on in training i had 2 overspeeds during startup due to faulty governors. what you are describing sounds somewhat familiar in that the heli was in a stable hover and after being established the Governor spent the engine into overdrive. this to me sounds like a governor/fuel control problem.

 

I can say this because of how i start the heli and i have every since the 2nd overspeed.

with governor ON (originally) i would let the Governor control the rollup to green arc another words i didnt guard again a runaway governor.

 

as a result i got the 1st overspeed. i changed the way i did startup. Then about a month later my instructor was preping as i was tending something, as i finished he said your controls and i gave the corsponding "my controls" I had the Governor "ON" and began rollup. the Eng and Rotor RPM went green and stabilized, I vocalized stable in the green. when i released hand pressure which was holding throttle in the green the Governor shot the RPM to about 118%.

 

the instructor didn't even have time to react to the RPM spike as it was already at 102% and went to 118% in about 1-2 seconds.

 

 

this is just my experience. now i let the Governor begin the rollup and then i slow it down around 95% ust to catch it. ust to ensure it doesnt run away when i release it. (hope to catch it during initial check of 80-90%)

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That is exactly how I teach it Alpha and for that very reason. I just hope that if someday I do have a faulty Gov, it actually works!! :)

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