Mailing List flyrotary@lancaironline.net Message #63557
From: Neil Unger <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine Mount design
Date: Sun, 16 Jul 2017 18:36:12 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Mark, sorry for the del;ay in reply but I have been on leave for a week, apologies.  Yes these measurements are for my glasair sportsman, but most have similar offsets.  If in doubt just get a look at a commanche 400 which looks like the engine is almost sideways.  What I did was to generate a center point out 3 feet from the firewall (or thereabouts) with a fixed frame, then I made an extension from the psru and the mounting p[late which had a point on the other end that was fitted into the offsets drawn on the firewall.  Then an easy job to make up the engine mounts.  Took longer to make up the frame with level and plumb bob.,.   Good luck.  Neil.


On 7/11/2017 8:01 AM, Mark McClure wrote:
Neil,

Are these offsets for Glasair or other aircraft?  I was told by Factory Rep that the Glasair had minimal offsets.  So I was not going to build them in. The other issue I see is that degrees are based on the exact same thrust point which I have never been able to get them to give me and I do not have a cowling to generate.

Mark


On Jul 10, 2017, at 5:31 PM, Neil Unger <flyrotary@lancaironline.net> wrote:

Mark,  Do not forget the "offsets" with the engine.  The exact numbers can only be sourced from the factory, but from memory the engine has to face to the right 1.5 degrees and down 1.78 degrees.  Check these figures with the factory.  regards,  Neil.


On 7/11/2017 6:35 AM, Mark McClure wrote:
Well I think I have designed my mount for the Glasair.  Overall I think it will be a bit overkill but I am ok with that.

Should put the CG close to the same spot as for the Lyco.  Thrust point in the same spot.  Green bars were part of the Glasair mount for a Lycoming. (There was also one between the two upper points but I don’t think any of them are truly necessary with the stabilization of the plate.  Yellow bar I am calling optional at this point to make it easier to work with intake/exhaust.  Another idea we had was to weld on a flange for both sides of the yellow bar and have it bolt on during final install.

Thoughts?

Mark



<Screen Shot 2017-07-10 at 4.32.56 PM.png>



Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster