Lord Dynafocal Engine Mounts Data

Discussion in 'Firewall Forward / Props / Fuel system' started by Mad MAC, Dec 9, 2019.

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  1. Dec 9, 2019 #1

    Mad MAC

    Mad MAC

    Mad MAC

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    I am on the hunt for data on the Lord Dyna focal mounts (particularly IO-540 but beggers can't be choosers plus one can never have too much data).

    So far I have found
    https://www.comancheflyers.com/publication/view/260-c-lord-mount-update/

    There is also the attached PDF which is interesting (the good bit is in the 2nd half) but also such terrible quality it little more than a tease. anyone got a clear copy?

    Edit for some reason I keep thinking its dynaflex not Dyna focal
     

    Attached Files:

    Last edited: Dec 9, 2019
  2. Dec 9, 2019 #2

    Dana

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  3. Dec 9, 2019 #3

    Mad MAC

    Mad MAC

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    I have tried Lord, there website doesn't have anything on aircraft engine mounts. Haven't had a reply to an email so far either.

    PS Dana you couldn't change the thread title please, it should be Dyna Focal.
     
  4. Dec 9, 2019 #4

    BJC

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  5. Dec 9, 2019 #5

    Dana

    Dana

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  6. Dec 10, 2019 #6

    BJC

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    Yup, that will get you there too, with a couple extra clicks.


    BJC
     
  7. Dec 10, 2019 #7

    Mad MAC

    Mad MAC

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    I am not actually trying to select mounts, more get a handle on the degree of engine movement permissible. The Lord installation drawings have lots of interesting detail such as static engine defection (looks to typically run about 0.100" at the prop flange and ~2/3's of that at the mounting plane) & maximum possible deflection.
     
    Last edited: Dec 10, 2019
  8. Dec 10, 2019 #8

    BJC

    BJC

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    I suspect that Lord tech support will tell you that allowable engine movement is up to the designer as long as maximum distortion limits are not exceeded. They should be able to quote maximum allowable mount distortion.

    Actual maximum distortion will be determined by the mount selected, spacer selected (i.e., mount pre-load), flight envelope, permissible maneuvers within the envelope, propeller, engine, max RPM, accessories mounted to the engine, the airframe, and the degree of engine movement damping that you deem acceptable. Some HBA Lycoming installations use 4 stiffer mounts in +g compression and softer mounts in -g compression. As they say, “It all depends ...”

    The links provided have tech support contact information.


    BJC
     
  9. Dec 11, 2019 #9

    Mad MAC

    Mad MAC

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    Thanks BJC
    I missed the aerospace dedicated contact I will see if I get a response out of that contact.

    Being outside the US (NZ) I find one tends to get use to requests for information getting directed to the Asian office and those tend to be less than helpful.
     
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  10. Dec 11, 2019 #10

    Dan Thomas

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    Be aware that there are at least two dynafocal designs, with the focal points in different places. One is near the engine cg, IIRC, and the other more forward, perhaps at the engine +prop cg.

    Also note the reversed positions of the ringed shockmounts between top and bottom mounts. Top aft is in compression (at rest) and the bottom forward is in compression.
     

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