REFLECTOR: Nose gear Hydraulic Regulator

[Scott Baker]

Re: REFLECTOR: Nose gear Hydraulic RegulatorHello Tom and All -
Someone once said that "It's the little things that ruin your day".  Taking a closer look at the nose gear doors "slamming", I am concerned about that little ball that is mounted onto the gear door hinge.  It's the ball that fits into the socket that is ultimately attached to the nose gear door cylinder linkage.  If that little ball were to pull itself free (because of the force of the slamming), then that nose gear door connection becomes detached and the door swings free and causes all sorts of interference problems with the nose gear going up and down.  John Carghill had this happen to him at Oshkosh 2003 - things got so jammed that his nose gear would not come down and he ended up with a scraped chin.  If things are slamming, I like the idea of slowing the movement down.
Scott B.

  ----- Original Message ----- 
  From: Tom Martino 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Thursday, August 05, 2004 1:23 PM
  Subject: RE: REFLECTOR: Nose gear Hydraulic Regulator


              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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