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With all that has been said and done about the Lancair gear system, I added gauges to my 235/320. At a cost of about $90 and a few ounces of weight. I know exactly what is happening with my gear system just like I do with the other critical systems on the airplane. I would not build another Lancair without them...
FWIW
Randy Snarr
235 320
N694RS
Sent from my iPad
On Mar 19, 2012, at 4:17 AM, "Bill Wade" <super_chipmunk@roadrunner.com> wrote:
> Just so, although each Lancair is built according to an individual's ideas. In my mind switches on the gear doors are a good way to ensure the gear is up. Years ago I patented an indicator system that among other things displayed gear up as well as down- nowadays I'm not so sure I'd want lights shining all the time.
>
> Complexity is subjective- there's tradeoffs involved. If you want to fly you can't get much simpler than a J-3 Cub. Anything more than that adds capability but also additional systems. A hydraulic gauge serves a purpose for me but it doesn't have to be for everyone. BTW, I'd use 5052 tubing instead of a hose- simpler, lighter, cheaper. -Bill Wade
>
> -----Original Message----- From: John Barrett
> Sent: Friday, March 16, 2012 8:13 AM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>
> Most IV's have gear indicators. Up and Down. If you don't have one or the
> other it would mean the gear is in transit.
>
> John Barrett
>
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bill
> Wade
> Sent: Thursday, March 15, 2012 12:44 PM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>
> Good point, although in the IV it appears that continuous pressure is
> needed to keep the gear up. Not sure how other models are but I'd guess
> they're similar. You might get some warning of low pressure from a pump or
> pressure switch malfunction if you had switches on the gear doors. Or if
> speed started to decay.
>
> Navions have an engine-driven pump with a controllable pressure/ dump
> valve. I'm used to checking the gauge prior to taxi to make sure the system
> is up and running. It's not a bad idea to make sure there's pressure even
> with over-center links and locking pins. -Bill Wade
>
> -----Original Message-----
> From: jeffrey liegner
> Sent: Thursday, March 15, 2012 8:34 AM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>
>
> After reviewing the options for tapping into the hydraulics, the plumbing
> and the gauge, rather than having a gauge on the panel somewhere, I'm now
> actually thinking I will place a transducer off the hydraulic distribution
> manifold in the gear well. Then I would make this an annual option (or
> periodic option), connecting a display gauge to read the high-low.
>
> I'm thinking that I don't need immediate and continuous monitoring of the
> pressure. If the flaps or gear transit time slows, I will know this. If
> the pressure is suddenly lost (catastrophic loss of hydraulics), having the
> gauge won't tell me more than what I already know...gear won't go down,
> flaps don't work. And having another high pressure hose behind the panel
> invites a new leak.
>
> Thoughts?
>
> Jeff L
>
>
>
>
>
>
> On the IV-P I'm planning to tee a mechanical gauge in the Pressure line
> going to the control valve assembly. That'd show me what's available for use
>
> and there's no need for any external power source.
>
> That could be in addition to transponders monitoring pressure at other
> points in the system. -Bill Wade
>
>
>
> I just finished installing 2 hydraulic gages. I was replacing all flex hyd
>
> lines with new, so it wasn't hard to include a T in the up line and down
> line located under the passenger seat. Made an aluminum add on mini panel
> that goes between pilot's legs and straddles my flap switch. Ran 2 four
> foot lines to back of gages. All works great on several gear swings, but
> no operational/environmental experience yet.
>
> I definitely wanted the gages where I could see them for any diagnosis, and
> the panel was full of 1000 steam gages already.
>
> Gages are number 9780T221 from McMaster-Carr for a low $21.48 each. These
> are liquid filled with silicon (-40 deg F to 158deg F). Entire operation
> cost less than $100.
>
> I'll forward a picture in day or so.
>
> Jack Addison jraddison@msn.com
> IO360 high comp
>
>
>
> -----Original Message-----
> From: jeffrey liegner [mailto:liegner@ptd.net]
> Sent: Monday, March 12, 2012 6:56 AM
> To: lml@lancaironline.net
> Subject: Suggested Pressure Gauge for Hydraulic Monitoring (LIVP)
>
> Any suggestions on which small hydraulic pressure gauge would be a good
> choice to display hydraulic pressure, either during preflight (ex, in wheel
> well) or inside the cockpit (for monitoring)? Analogue or electric display?
> Best location to T the gauge into the system?
>
> Thanks.
>
> Jeff Liegner
> Sparta, NJ
>
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