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From: Randylsnarr <randylsnarr@yahoo.com>
Subject: Re: [LML] Re: hydraulic pressure gauges

With all that has been said and done about the Lancair gear system, I added g=
auges to my 235/320. At a cost of about $90 and a few ounces of weight. I kn=
ow exactly what is happening with my gear system just like I do with the oth=
er critical systems on the airplane. I would not build another Lancair witho=
ut 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> wro=
te:

> 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 displa=
yed gear up as well as down- nowadays I'm not so sure I'd want lights shinin=
g all the time.
>=20
> Complexity is subjective- there's tradeoffs involved. If you want to fly y=
ou can't get much simpler than a J-3 Cub. Anything more than that adds capab=
ility 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
>=20
> -----Original Message----- From: John Barrett
> Sent: Friday, March 16, 2012 8:13 AM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>=20
> Most IV's have gear indicators.  Up and Down.  If you don't have one or th=
e
> other it would mean the gear is in transit.
>=20
> John Barrett
>=20
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bil=
l
> Wade
> Sent: Thursday, March 15, 2012 12:44 PM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>=20
> 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.
>=20
> 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 syste=
m
> 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
>=20
> -----Original Message-----
> From: jeffrey liegner
> Sent: Thursday, March 15, 2012 8:34 AM
> To: lml@lancaironline.net
> Subject: [LML] Re: hydraulic pressure gauges
>=20
>=20
> 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.
>=20
> 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 th=
e
> 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.
>=20
> Thoughts?
>=20
> Jeff L
>=20
>=20
>=20
>=20
>=20
>=20
> 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 u=
se
>=20
> and there's no need for any external power source.
>=20
> That could be in addition to transponders monitoring pressure at other
> points in the system.  -Bill Wade
>=20
>=20
>=20
> I just finished installing 2 hydraulic gages.   I was replacing all flex h=
yd
>=20
> 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.
>=20
> I definitely wanted the gages where I could see them for any diagnosis, an=
d
> the panel was full of 1000 steam gages already.
>=20
> Gages are number 9780T221 from McMaster-Carr for a low $21.48 each.   Thes=
e
> are liquid filled with silicon (-40 deg F to 158deg F).  Entire operation
> cost less than $100.
>=20
> I'll forward a picture in day or so.
>=20
> Jack Addison    jraddison@msn.com
> IO360 high comp
>=20
>=20
>=20
> -----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)
>=20
> Any suggestions on which small hydraulic pressure gauge would be a good
> choice to display hydraulic pressure, either during preflight (ex, in whee=
l
> well) or inside the cockpit (for monitoring)?  Analogue or electric displa=
y?
> Best location to T the gauge into the system?
>=20
> Thanks.
>=20
> Jeff Liegner
> Sparta, NJ
>=20
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