Main Gear Walking Beams

[Bob_Belville]

Caught this during annual. Right side hanging on by one ear, the left side cracked. So be sure to check, the new ones are considerably stouter.

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[Guitarmaster]

Just now, Bob_Belville said:

 

Caught this during annual. Right side hanging on by one ear, the left side cracked. So be sure to check, the new ones are considerably stouter.

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Pictures??

[Bob_Belville]

Caught this during annual. Right side hanging on by one ear, the left side cracked. So be sure to check, the new ones are considerably stouter.

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[Bob_Belville]

I thought I had attached pic, phone instead of computer!

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[Guitarmaster]

3 minutes ago, Bob_Belville said:

Caught this during annual. Right side hanging on by one ear, the left side cracked. So be sure to check, the new ones are considerably stouter.

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Good catch!!  

[MB65E]

Thanks Bob!!

Ill take a look!!

-Matt

[mike20papa]

I don't recognize these on my woodwing.  Are these located in the wheel wells or in the fuselage?

[N201MKTurbo]

Its weird that they broke, there shouldn't be any force on the idler arms.

[Bob_Belville]

Its weird that they broke, there shouldn't be any force on the idler arms.

DMax has a large collection of them!

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[Bob_Belville]

I don't recognize these on my woodwing.  Are these located in the wheel wells or in the fuselage?

In the wing, my plane has the LASAR liner so the "walking beam" is out of sight.

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[Bob_Belville]

In the wing, my plane has the LASAR liner so the "walking beam" is out of sight.

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[cliffy]

WOW never thought they would break but I do look at them.

Good find. 

[Marcopolo]

19 hours ago, N201MKTurbo said:

 

Its weird that they broke, there shouldn't be any force on the idler arms.

 

  I looked at these walking beams on Bob's plane and at first impression I would agree that there would be no real force in play on these parts, but as we looked closer at the action on the landing gear in motion you can see that at the upper and lower edges of travel there will be a twisting motion on these beams due to the offset of the two heims held between the fork of the beam.  If there is any binding during travel of the gear or if the rigging of the overcenter or limit switches is off, it would appear that these beams can take on a good bit of twisting force at the fork end of the tube.

 

Ron

[1964-M20E]

20 hours ago, Bob_Belville said:

Its weird that they broke, there shouldn't be any force on the idler arms.

DMax has a large collection of them!

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While I do not know the exact amount of force but since both rod ends are side by side they will introduce a twisting motion on the idler arm and a shear force on the bolt through the rod ends.

[Bob_Belville]

32 minutes ago, 1964-M20E said:

While I do not know the exact amount of force but since both rod ends are side by side they will introduce a twisting motion on the idler arm and a shear force on the bolt through the rod ends.

Yeah, so it's likely that twist is mostly, only(?), while gear is in motion and lowering the gear at higher speeds would tend to exacerbate it? 

[Bob_Belville]

If I haven't already mentioned it, the reason we were looking so carefully was that the right main gear was hanging about 3/8" lower than the left. I posted a picture on an earlier thread.

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[MyNameIsNobody]

How many airframe hours?

[Bob_Belville]

How many airframe hours?

3100.

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[Marauder]

Now for the rest of the story (written in the Paul Harvey style). What Bob isn't telling everyone is that he really is flying around a bit more heavily loaded than he lets on. Right Bob?




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