REFLECTOR: Nose gear Hydraulic Regulator

[Tom Martino]

            This may sound a bit crass ... but who cares if the doors
shut abruptly.  I've observed dozens of gear retraction tests ... and
the fast, hard action doesn't seem to do a bit of harm.
 
 
-----Original Message-----
From: Al Gietzen [mailto:ALVentures at cox.net] 
Sent: Thursday, August 05, 2004 10:56 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: RE: REFLECTOR: Nose gear Hydraulic Regulator
 
I had originally introduced the idea of locating the sequence valve to
actuate on the web of the strut, thinking that, in addition to simpler
plumbing and access, it would solve the slamming by opening the sequence
valve more slowly.  Although it definitely helped, I found that at
certain adjustments, and in certain cases the doors slammed anyway;
especially when I adjusted the sequence valve to only open a small
amount in an attempt to have it also function as a "throttling" valve.
It depended upon whether the main gear was fully up before the doors
closed.  If so, they would slam because of the high pressure spike at
the end of the travel.
 
The solution was to extend the adjusting screw in the sequence valve so
it would open further, and stay open through the nose gear "bounce" at
the end of its travel, allowing the doors to fully close after the nose
gear retracted and the main gear were still in travel.  The nose gear
normally retracts first, but not always.  Even if the mains go up first,
the nose gear will come off over-center when the mains hit the top; and
the mains will drop back a bit as the nose gear comes up, so the
solution still applies.
 
I don't know if this applies in your case, because depending on your
sequence vale location, you probably can't get the doors to close all
the way before the mains are fully retracted; but you might try changing
the sequence valve adjustment.  Of course if valve stem is hitting
bottom, extending the screw further may damage the valve.
 
Al
 
	on 8/4/04 9:00 PM, PVTPIL8 at aol.com at PVTPIL8 at aol.com wrote:
	I am wondering if anybody has a part number and a location for
an inline regulator for the nose gear hydraulic cylinder.  My nose gear
doors slam close and Scott Swing said some people are using an in line
regulator to slow them down.  Any help would be appreciated.
	Thanks Steve
	N787SB
	XL-RG
	
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