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Date: Tue, 21 Nov 2006 01:58:14 -0500
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From: randy snarr <randylsnarr@yahoo.com>
Subject: Re: [LML] Re: Electrical /Hydraulic system questions lancair 235/320
In-Reply-To: <list-1585773@logan.com>
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Scott,
Thanks for the reply. If the ground was bad to the
dimmer system why would the flickering go away when
the alternator is turned off?
I do also have a little alternator whine in the
headset that also goes away when the alternator is
turned off.
That is a good point though. I will take a closer look
to see if other lights not running through the dimmer
are doing the same thing. If so I will look closer at
the regulator. If not I will investigate the dimmer. I
should have already done that.

I am using the suzuki samuri alternator with the
voltage reg removed. I have a seperate Ford style
regulator. The battery is an RG25 by concord.

As for the low side hydraulic pressure, shouldn't that
side be open to the resevoir when the gear is up
keeping that side at 0? I am not entirely sure how the
hyd pump operates as it relates to pressure on the
oppisite side of the system when it is running.
When I originally installed and tested the gear I
could open the dump valve and move a gear leg by hand
up and down with little resistance. Now when I do the
same thing (open the dump valve on the jack stands and
push the gear up by hand) I notice there is some
resistance or building pressure as the gear leg is
pushed up into the wing. I am not sure what has
changed or if this is normal. With the dump valve
open, what would cause the building resistance? I
would think that whatever the position of the gear,
the opposite side should be open to the resevoir at
the pump. 

Randy..

--- Sky2high@aol.com wrote:

>  
> 
> Randy,
>  
> Flickering Lights
>  
> The voltage regulator is certainly a possibility. 
> How about a loose  
> connection to your light dimming circuitry or a bad
> ground there?   What alternator, 
> regulator and battery are you using?
>  
> Lo side pressure
>  
> It is hard to imagine the low side fluid expanding
> since there is so little  
> of it available when everything is sucked up. 
> However, if the stops are,  uh, 
> not rigid, it is conceivable that the up side fluid
> pressure  rise could push 
> the piston further, maybe thru fluid expansion in
> the nose  wheel well 
> actuators that are heated by lower cowling air
> entering the  well during flight.  
> The ambient temperature rise in the main gear  wells
> doesn't seem high enough to 
> have much of an effect except that it isn't  helping
> relieve any pressures.  
> Maybe Chris has more useful  information.  Luckily
> your pressures are 
> different enough that the dump  valve relieves the
> lo side enough to allow the pump to 
> come on.
>  
>  
> Scott Krueger  AKA Grayhawk
> Lancair N92EX IO320 SB 89/96
> Aurora, IL (KARR)
> 
> A man  has got to know his limitations.
> 
>  
> In a message dated 11/20/2006 9:16:51 A.M. Central
> Standard Time,  
> randylsnarr@yahoo.com writes:
> 
> I  haven't posted in a while as I have been busy
> flying
> and completing my  interior.
> I will post a few pics when I am completed to keep 
> the
> grinding, sanding crowd motivated.
> 
> Anyway, I was flying recently  near dark and I had
> the
> panel switch lights on. Can someone tell me why  my
> lights flicker with the alternator on? 
> 
> When I turn the  alternator off the flicker goes
> away.
> Is this just a bad voltage regulater  or something
> else?
> Ironicly my wifes Lexus suv started doing the  same
> thing. Maybe it is her fault!
> 
> 2nd question. I have experienced  the same issue as
> some have documented regarding the gear not  coming
> down without recycling the dump valve. I flew on
> Friday and  noticed something interesting. 
> 
> Here are the facts:
> 
> Depart from  PVU
> 50 deg f
> 4500 ft field elev
> cruised at 12.5 for 1.2 hrs to a  warmer place
> decend to 4000 ft 
> new atmosphere temp near 65 f
> 
> I  have gauges on the high and low side of the hyd
> system
> After take off  they idicated low-0 and high-1300 or
> so.
> After decending to a warmer  atmospheric conditions
> both  the high and low side of the hydraulic  system
> had significantly risen. low 400 psi and high  1700
> psi.
> 
> What happens in my case is the system pressure rises
> in  cruise on the high and low side. The lower side
> exceeds the high pressure  switch and the gear does
> not
> come down. I open the dump valve and then  close it
> and
> the gear acts normally. 
> 
> My question relates the down  side witht he gear up.
> It would seem to me that that side should always 
> stay
> at 0 relieving pressure back to the resevoir in the
> pump.
> 
> At  first I thought I may have a leak somewhere
> allowing the pressure to sneak  past the high side
> to
> the low side in cruise. I do not believe that  is
> happening to me as both the high and low sides rise.
> 
> 
> Can someone  give me some idea where to start?
> 
> 
> 
> 
> 
> 
> 


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