Lord Dynafocal Engine Mounts Data

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Mad MAC

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Dec 9, 2004
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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
 

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Mad MAC

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Dec 9, 2004
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Hamilton New Zealand
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.
 
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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.

For more information, contact technical support at Aerospace_CustomerService@LORD.com or +1-877-ASK-LORD (275-5673). International, call (011) 919-275-5673

BJC
 

Mad MAC

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Messages
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Hamilton New Zealand
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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Dan Thomas

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Sep 17, 2008
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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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