From: Arthur W. Brooks
Sent: Wednesday, June 06, 2007 8:48 AM
To: Thomas G. Brown
Cc: Robert A. Ellis
Subject: FW: Full Period Deflections

Attachments: Full Period Deflections.ppt

Tom,

I seem to have lost the contents of a couple of slides so here they are again. I've added results for supporting only under the B's for all 4 feet and for just 3 feet in case the base is out of plane.

Art 

-----Original Message-----
From: Arthur W. Brooks 
Sent: Tuesday, June 05, 2007 3:00 PM
To: Thomas G. Brown
Cc: Robert A. Ellis
Subject: Full Period Deflections

Tom,

I've run a few support cases for the Full Period to see how stiff it is. 

If we fully support the Period under each of the feet or even just the A & B feet, the deflections are fairly small (~3 mils). 

If we support it off the C feet only but maintain full contact (keeping it level of course) the deflections increase to almost 14 mils. 

If we wind up only partially supporting the C feet at a few points (see attached), the deflections can grow quite large (182 mils!) with the period rocking back towards the NB port and actually pulling up on the front feet (probably not too stable!). In this case if we add support points to the back A feet, this is significantly reduced to under 6 mils.

When you get a chance, let me know if you have specific support locations and I will run them thru ANSYS to see how it deforms.

Art