Today's Message Index:
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1. 07:30 AM - Re: tires (SD737@aol.com)
2. 07:51 AM - Re: L29 air system mod (delfin)
3. 12:45 PM - Re: tires (Bill Geipel)
Message 1
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Doesn't Desser Tire in the USA make new tires for the L-29?
Message 2
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| Subject: | Re: L29 air system mod |
=0A-=0AWhat type of high pressure- shut off valve is used. Must be reli
albe to avoid =0Aleaking=0A=0A=0A=0A________________________________=0AFrom
: Jorgen Nielsen <jorgen.nielsen@mweb.co.za>=0ATo: l29-list@matronics.com
=0ASent: Sun, October 17, 2010 4:04:38 PM=0ASubject: L29-List: L29 air syst
em mod=0A=0A=0ABeen some discussion around the air system - Jean shared his
compressor =0Amodification which is great.=0A-=0AFor those wanting to do
the same, one could use an old Cornelius compressor - =0Aits a 3 stage dri
ven by an 24V electric motor.- People used to buy them surplus =0Aand rig
up homebrew compressors, some googling should reveal more.=0A-=0AFrom a
ground handling perspective the Achilles heel of the L29 is the air =0Asyst
em - if you flying away somewhere, its necessary to send air ahead by road,
=0Aor arrange air at the destination - either scuba air or Nitrogen, both
work =0Aperfect.- I have done this!=0A-=0ATo get around this, I also ca
me up with an idea and made a modification which =0Ahas worked trouble free
now for 3 years.=0A-=0AI never fly above 20,000ft so do not need oxygen.
- I therefore replaced the =0Aoxygen tanks with additional "normal" tanks
.- Lets call the standard system the =0A"A" tanks, and the additional set
the "B" tanks.- Each set- of tanks has a shut =0Aoff valve which then
goes into a t-fitting - the middle of which feeds the =0Aaircraft air syste
m.- So one or both valves has to be open for flight.- =0AOperation is s
imple - if its a local flight open say the "A" system valve, check =0Apress
ure, add air if required and fly.- After the flight, close the valve.-
All =0Athe air stays in the tank as there are no losses downstream. -=0A
-=0AFor away flights, I open both valves, fill up the system, close off s
ay the "B" =0Asystem, and fly.- On landing, I shut off the valve.- I ca
n then leave the =0Aaircraft, knowing that when I return it has not lost an
y air.- I can fly several =0Asorties, all on the first "A" set of tanks.
- And I still have a full set of "B" =0Atanks.- So when the first set g
ets low on pressure, I simply use the other set.=0A-=0AIt works great.-
I made one away trip about 2 months back where I flew to =0Adestination, f
lew 3 sorties, and flew back, several days later.- And still had =0Alots
of air.=0A-=0AThe other great thing about this mod is that the standard s
ystem has 8l of air, =0Athe secondary system has 12l.- So the mod takes t
he air carried on board from 8l =0Ato 20l in total ( or to be precise from
1200l to 3000l at 150 bar) , and the =0Aability to shut off the tanks means
no lost air when on the ground. =0A=0A-=0AYou have to remember to open a
set of tanks before flight - I preflight in the =0Anormal way, and open th
e air system then check in the rear cockpit that not only =0Athe main air s
ystem is ok, but also the backup air.- After start, my final =0Apre-taxi
check is the pneumatic pressure - I then roll forward and check brakes, =0A
and re-check pneumatic pressure.- There should be no change.- If you op
en the =0Aair, then close it again, the gauge will drop about 20-30 bar fro
m one brake =0Aapplication.=0A-=0ARegards Jorgen=0A-=0A-=0A-=0A-
================ =0A=0A=0A=0A
Message 3
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I called and they said no. They also said they would recap them but
haven't done that either. We sent them
some but they hadn't done it yet.
----- Original Message -----
From: SD737@aol.com
To: l29-list@matronics.com
Sent: Monday, October 18, 2010 9:26 AM
Subject: Re: L29-List: tires
Doesn't Desser Tire in the USA make new tires for the L-29?
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