Bill,

My fuselage structure is a bit different in that I eliminated the
pressure bulkhead that is normally behind the rear seats in the IV-P and
ES-P.  Instead I added additional layers of carbon to the fuselage to
stiffen it, glassed over the cargo door, and constructed a pressure
bulkhead at the aft end of the cargo area.  My pressure vessel is thus
50% longer than normal, about 12 ft long vs standard 8 ft.  

At the lower pressures we were mainly interested in finding leaks and
neglected to measure dimensions.  When things stabilized we started
checking.  At 7 psi no one had the kahonees to stay inside and measure.
Aft of the rear seats the cross section becomes very round and as
expected there was very little change there.  Greatest distortion was at
the aft edge of the door.  Cabin width changes in inches at 3 locations
were:

Pressure Door Rear Seat Aft bulkhead
3 psi 0.45" 0.35" 0.10"
4 psi 0.50" 0.41" 0.15"
6 psi 0.70" 0.57" 0.24"


Robert M. Simon
ES-P N301ES


-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
billhogarty
Sent: Wednesday, July 12, 2006 6:49 PM
To: Lancair Mailing List
Subject: [LML] Re: Pressure testing

For Robert Simon:

Hi Bob:

I plan to start pressure testing  on 9/1.  Can you quantify the amount
of "bulge" you are experiencing?  Is there any other spot besides the
door rear that is pronounced?  Was there much of a difference in the
bulge between 5 and 7 PSI?  Any suggestions would be appreciated.

Thanks,  Bill Hogarty


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