Hi Jay-
You have not said much about your tubing - rigid or hose. However, I also m
ade an EZ home setup that works great. Some of my findings:
-
If you have a Tygon hose setup check your supply of plastic fittings. Cheap
ones have flashing on the barbs that create leaks. Best source for "fresh
or soft" Tygon and fittings is www.usplastics.com. This is the approach I t
ook and passed two official pitot/static tests with "zero leakage".
-
Also, if you have vinyl hose on your test setup it is guaranteed to-leak
and the leak will change with temperature.
-
Looks like your getting close.
-
Bill DeRouchey
N939SB
-
--- On Thu, 11/19/09, Rick Sked <ricksked@embarqmail.com> wrote:
From: Rick Sked <ricksked@embarqmail.com>
Subject: Re: Pitot system testing
To: rv10-list@matronics.com
Date: Fri, 20 Nov 2009 07:43:21 AM PST
You may want to check the tray if you have a TruTrak AP installed, I had an
issue with the tray when testing the panel alone. I have a similar drop in
pressure right now but the system matches right up with the GPS speed & al
titude so It doesn't appear to be an issue. I plan on having the pitot/stat
ic check completed soon which may or may not tell me I have a problem. The
ballon test works pretty well for now. Maybe an instrument guru can tell us
if there is some allowed blowby in the instruments themselves. All of my c
onnections are confirmed not to leak so it's going somewhere. The only plac
e I can think is internally on the instrument itself.
Rick Sked
N246RS
----- Original Message -----
From: jfrjr@roadrunner.com
To: "Matronics RV-10 list" <RV10-list@matronics.com>
Sent: Thursday, November 19, 2009 3:53:52 PM GMT -08:00 US/Canada Pacific
Subject: Pitot system testing
I have tested my pitot system using the EZ homemade system.- Works well w
ith my indicated AS right on the mark.- But I have a slow leak that I can
not find.- Loses about 1 knot every 3 to 4 minutes. A little faster loss
at higher manometer pressures.- The leaks seems to stop when the manomet
er pressure gets to about 7.5 inches (105 Knots).- Is this acceptable?-
Any advice on how to find leak--I have "soapy bubble tested" all connectio
ns.- Thanks.- Jay rowe
le, List Admin.
