Interesting Helicopter Blade Calibration Kamov

Discussion in 'Flight Following' started by Tantalum, Mar 26, 2020.

  1. Tantalum

    Tantalum Final Approach

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    Wow... they paint the ends of blades, fire up the helicopter, then while the rotors are spinning gently touch a fabric on a stick to it

    Also.. love that there are no torque wrenches, whatever.. they're basically working on a tractor and just tightening things by feel

     
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  2. Doc Holliday

    Doc Holliday Cleared for Takeoff

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    When I first started out we would track rotor blades using a brromstick and a piece of chalk taped to the end. Stand under the rotor disk running at RPM and flat pitch, then gently raise the stick till it slightly contacted. Shut down and check which blades got marked, make adjustments, clean off chalk marks and repeat till all blades got the same mark.
     
  3. Doc Holliday

    Doc Holliday Cleared for Takeoff

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    All you need to work on a Russian helicopter is a hammer and chisel. :eek:
     
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  4. asicer

    asicer En-Route

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    If you are talented, you don't need the chisel.
     
  5. Bell206

    Bell206 En-Route

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    Ha, good ol' "flag" tracking. Back in the day, we all had to prove our prowess with the flag method before they would let us track/balance with the strobe method. Hardest part was not extending flag/tape too far into the rotor disc and breaking the tape. Or as some geniuses would learn the hard way, the blades are color coded for a reason, so when you mark the blade tips you should use the same color as the blade you're marking.o_O

    Here's another version:
     
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  6. Spring Ford

    Spring Ford Pre-takeoff checklist

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    Two helicopters,

    one US, one Russian
    both twin contra-rotating rotors
    both look like old bread vans
    both twin boom
    both twin vert. stabiliser
    both, well, ugly
    both made by Kamxx.

    How can this be?

    Every time I see either, an image, never seen either one in real life, I think "that's one of those weird Russian helicopters". Sometimes I am not wrong.

    upload_2020-3-26_20-22-14.jpeg upload_2020-3-26_20-23-0.jpeg
     
  7. benyflyguy

    benyflyguy Pattern Altitude

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    So sounded like a piston starting up- had intakes like a turbine. Turns out those are radial engines in there. Crazy. Goes back to helos are just witchcraft plain and simple
     
  8. Bell206

    Bell206 En-Route

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    FYI: the way to separate the US one is that the Russian has the M/R discs stacked in separate plains, one on top of the other. In the US version, the two separate rotor discs are mounted side by side and inter-mesh with each other on intersecting/angled plains. At the old day job we picked up 2 later versions called the KMAX but had the same M/R system. A sight to see.
     
  9. GrummanBear

    GrummanBear Pre-takeoff checklist

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    That thing sounds just like my Cummins.
     
  10. Tantalum

    Tantalum Final Approach

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    Wow.. I had no idea the method was that low tech.. I assumed this was just some crazy back country Russo-Hungarian way of doing it

    So how do they decide who gets to hold the stick up to the blades??
     
  11. Tantalum

    Tantalum Final Approach

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    the KA-26 is pretty cool, there are some real cowboy videos on YouTube of these things cruising the Hungarian countryside either just tooling around or crop dusting. They're the stuff of dieselpunk fantasy

    They seem rather indestructible.

    Inside at around 2min.. sounds like something out of Star Wars.. that tree at 2:47!
     
  12. Velocity173

    Velocity173 Touchdown! Greaser!

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    Used to be pretty common on Hueys back in the day. I wanna know who holds the stick for the inflight tracking check! ;) It’s all fancy computers and laser beams these days.
     
  13. Bell206

    Bell206 En-Route

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    Until the mid to late 60s it was the only way to track the M/R. Once the Chadwick 177 system became widespread, that method fell to the way side but the procedure remained in the MMs until the late 80s if I remember correctly. However, once the track was done, you had to balance the M/R which relied on wrapping fixed lengths of tape at a certain point for the tip of the M/R blade until it "felt" balanced. Then you weighed the tape and added a calculated lead weight equivalent to the M/R hub or hollow blade bolts. Then you went fly with an "experienced" pilot (per the MM) and it was all trail and error to get the best ride.
     
  14. Bell206

    Bell206 En-Route

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    Only if you have the money. My "state-of-the-art" ACES 2020 runs on Windows 3.1 and still uses a strobe.:)
     
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  15. wilkersk

    wilkersk Pattern Altitude

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    I've tracked blades using the Vibrex on Hueys and CH-46 Sea Knights. I've also used the newer track and balance system on the 46's. No smoke and mirrors. It pretty straight forward.
     
  16. Velocity173

    Velocity173 Touchdown! Greaser!

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    To be honest, I think that’s what our mech uses. RADS or micro vibe kit, all I know it’s crap that I worry about flying off in flight! :D We actually did the tail rotor on our little “green machine” this week.


    DF234EB1-0EA6-4261-8EBE-8A065856FB60.jpeg
     
    Last edited: Mar 26, 2020
  17. ktup-flyer

    ktup-flyer En-Route

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    The State of MS used to have a couple of those. I think the forestry dept used them
     
  18. skier

    skier Line Up and Wait

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    Used to have a.m couple what? 407s (mildly surprising)? Kamans (very surprising)? Or Kamovs (exceptionally surprising)?


    I’ve seen Kamans in person and they’re really cool machines. I’d love to see an older Kamov, but don’t have any trips planned to Russia anytime soon.
     
  19. Bell206

    Bell206 En-Route

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    Ha. Don't care for Micro-Vib even though it was developed by former Chadwick engineers. The only reason I went ACES was I couldn't get my 177 fixed anymore.:( However, give me a RADS and I'll balance the moon.:eek:
     
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  20. jimhorner

    jimhorner Line Up and Wait

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    My father was an aircraft and helicopter mechanic in the US Army in Korea. He was there just after the fighting stopped. According to his stories, this is the same method that he used to check blade tracking.


    Sent from my iPhone using Tapatalk Pro
     
    Last edited: Mar 26, 2020
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  21. ktup-flyer

    ktup-flyer En-Route

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    Kaman K225. Mississippi State Geological Survey
     
  22. Tantalum

    Tantalum Final Approach

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    Learn something new everyday!

    I guess I assumed these things would self track just based on the amount of lift generated and the centrifugal force
     
  23. Doc Holliday

    Doc Holliday Cleared for Takeoff

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    One blade flying a half inch above the others will cause a significant bump felt in the controls and airframe. This is typically adjusted by using pitchlinks on the rotor grip. Once you get the blades in track then you must fly the helicopter and check inflight track. Those adjustments are typically done bending the trim tab on the blades.
     
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  24. darrell

    darrell Pre-takeoff checklist

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    After working on Russian helicopters for the last 13 years, I can say that you also need a crescent wrench. Metric, of course.
     
  25. Sac Arrow

    Sac Arrow Touchdown! Greaser!

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    I saw a Kamov flying around at Danang airport a few years ago when I was leaving on an Airbus. Cool looking things to watch. Re: the video, I wonder why they didn't do the top blades first? Seems like it would have been easier.
     
  26. Bell206

    Bell206 En-Route

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    FYI: I believe there's a Ka-32 still operating in Canada. It's the big brother of the one above. Saw it in action years ago when there was talk of allowing them in the US for restricted work.
     
  27. k9medic

    k9medic Pre-takeoff checklist

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    Dang. She looks good fresh out of paint.
     
  28. Velocity173

    Velocity173 Touchdown! Greaser!

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    I’m the only one out here who likes the colors! Always liked a green, white and gold combo. I switched her out Wednesday with our primary so she should be on a reposition today actually.
     
  29. Warlock

    Warlock Cleared for Takeoff

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    Even in the early to mid 80’s we would use a tracking flag...if we were having issues with the Vibrex to track our UH-1s, AH-1s and evening OH-58’s...often was used to get it close as a first step then use the electronics to fine tune.
     
  30. k9medic

    k9medic Pre-takeoff checklist

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    I ran up an Agusta 109E one time while the mechanic did this same type of tracking. Put grease on a piece of paper if I recall.

    The microvibe was messed up and was about 270 degrees out so every change they made was wrong. Had to start back at zero so they used the grease as a starting point to make sure.
     
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  31. midwestpa24

    midwestpa24 Pattern Altitude

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    I recognize that bird.
     
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  32. Velocity173

    Velocity173 Touchdown! Greaser!

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    Well if you live in Iowa, there’s probably a good chance you saw it there.
     
  33. midwestpa24

    midwestpa24 Pattern Altitude

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    I was around it quite a bit, it was local to here.
     
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