REFLECTOR: Retract gear modification

[David Scharfenberg]

I used one of these flow restrictors for a couple of years, and it 
worked well.  Mine was on the front of the canard bulkhead, in line 
with the door cylinder.  It went in the extra parts bucket when I 
changed to an all mechanical nose door system, which I like much 
better.

Dave Scharfenberg



On Apr 21, 2006, at 7:39 PM, Andrew Ellzey wrote:

> To all that are building a RG aircraft. I didn't fully understand 
> everyone's comments on the reflector about problems with their retract 
> gear until I completed my system and started trying to adjust the gear 
> door sequence. I found the same problems as everyone else. The main 
> thing that I saw on my system was that the nose gear didn't offer any 
> resistance to the main gear system until after it had been slammed 
> into its wheel well. Then the pressure would be sufficient to allow 
> the main gear over center to come unlocked. At this point the weight 
> of the nose gear was more that the main gear being retracted and the 
> nose gear would fall just enough to open the sequence valve and open 
> the gear doors. When the mains were through retracting the pressure 
> again became enough to again slam the nose gear back in its up 
> position and again close the nose doors. Its hard for me to believe 
> that the nose doors would survive very long with this abuse. See the 
> attached pictures for my fix for my gear system.
>  
> I have adjusted my nose gear to be retracted last. The sequence goes 
> as follows. The first thing to move is the nose gear. The nose gear 
> will come off its stop and travel maybe six inches before the main 
> gear unlocks and begins to retract. All gear will then move together 
> until the mains reach their full up position. At this point the 
> hydraulic pressure is about six hundred psi and now the nose gear 
> which is about 1/2 retracted, speeds up and finishes its full cycle. 
> There isn't any bouncing at the top of its retract cycle, just a 
> smooth stop and closing of the doors.
>  
> All of my pluming and sequence valve locations are per the manual. The 
> only difference is the addition of the flow control valve. The final 
> adjustment is up to you and what is the smoothest for your system. The 
> start point for my valve was about 1/2 turn open.
>  
> The flow control valve can be purchased from McMaster Carr or Granger. 
> The Granger (1A853) price is 24.47 McMaster was higher. I found it at 
> a local hydraulic supply for 17.00. It is a Series F flow control 
> valve Parker model # F200B. You will also need a 1/8 pipe hydraulic 
> nipple to install the valve, all other fittings were supplied with my 
> kit.
>  
> Your results could vary but I don't think so. This is the first of two 
> e-mails
>  
> Andy Ellzey<RG 
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