Today's Message Index:
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1. 01:33 PM - L29 aileron, flap, rudder and horizontal stabilizer (Jorgen Nielsen)
2. 02:07 PM - L29 air system mod (Jorgen Nielsen)
Message 1
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| Subject: | L29 aileron, flap, rudder and horizontal stabilizer |
Hi All
Just a reminder that I have some new aileron, flap, rudder and horizontal
stabilizer if anyone needs them. Still wrapped, complete with fittings such
as the rollers on the flaps etc.
Any interest drop me a mail.
Regards
Jorgen
Message 2
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| Subject: | L29 air system mod |
Been some discussion around the air system - Jean shared his compressor
modification which is great.
For those wanting to do the same, one could use an old Cornelius compressor
- its a 3 stage driven by an 24V electric motor. People used to buy them
surplus and rig up homebrew compressors, some googling should reveal more.
>From a ground handling perspective the Achilles heel of the L29 is the air
system - if you flying away somewhere, its necessary to send air ahead by
road, or arrange air at the destination - either scuba air or Nitrogen, both
work perfect. I have done this!
To get around this, I also came up with an idea and made a modification
which has worked trouble free now for 3 years.
I never fly above 20,000ft so do not need oxygen. I therefore replaced the
oxygen tanks with additional "normal" tanks. Lets call the standard system
the "A" tanks, and the additional set the "B" tanks. Each set of tanks has
a shut off valve which then goes into a t-fitting - the middle of which
feeds the aircraft air system. So one or both valves has to be open for
flight. Operation is simple - if its a local flight open say the "A" system
valve, check pressure, add air if required and fly. After the flight, close
the valve. All the air stays in the tank as there are no losses downstream.
For away flights, I open both valves, fill up the system, close off say the
"B" system, and fly. On landing, I shut off the valve. I can then leave
the aircraft, knowing that when I return it has not lost any air. I can fly
several sorties, all on the first "A" set of tanks. And I still have a full
set of "B" tanks. So when the first set gets low on pressure, I simply use
the other set.
It works great. I made one away trip about 2 months back where I flew to
destination, flew 3 sorties, and flew back, several days later. And still
had lots of air.
The other great thing about this mod is that the standard system has 8l of
air, the secondary system has 12l. So the mod takes the air carried on
board from 8l to 20l in total ( or to be precise from 1200l to 3000l at 150
bar) , and the ability to shut off the tanks means no lost air when on the
ground.
You have to remember to open a set of tanks before flight - I preflight in
the normal way, and open the air system then check in the rear cockpit that
not only the main air system is ok, but also the backup air. After start,
my final pre-taxi check is the pneumatic pressure - I then roll forward and
check brakes, and re-check pneumatic pressure. There should be no change.
If you open the air, then close it again, the gauge will drop about 20-30
bar from one brake application.
Regards Jorgen
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