Today's Message Index:
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1. 12:18 AM - Re: Off topic speeding ticket (Richard Lamprey)
2. 01:10 AM - Re: Secondary Fuel Pump, correct or not (josok)
3. 03:50 PM - Re: Secondary Fuel Pump, correct or not (josok)
4. 06:41 PM - Re: Secondary Fuel Pump, correct or not ()
5. 07:15 PM - Re: Aileron Trim servo (Rick Stockton)
Message 1
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Subject: | Re: Off topic speeding ticket |
Here in Kenya, they would have stopped the next five motorists and asked
them for 'very special something small' (known in north african circles
as bakshish), as Christmas is coming, and let them on their way
Message 2
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Subject: | Re: Secondary Fuel Pump, correct or not |
Craigh,
The Rotax and factories fuel circuit diagrams call for he pumps to be in series,
with non-return valves parellel to the pumps.
In that diagram a blocked fuel pump will be bypassed by a valve. I can not think
of any single component failure that would prevent fuel to be passed to the
engine.
Regards,
Jos Okhuijsen
Visit - www.EuropaOwners.org
Message 3
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Subject: | Re: Secondary Fuel Pump, correct or not |
Hi Ron,
How do you calculate that? Valve one open? Pump 2 will supply. Valve one closed?
Pump one will supply. Valve 2 open? Pump one supply, Valve 2 blocked, pump
2 will supply. The same logic counts for the pumps as well. Please explain where
the scenario goes wrong.
It does not matter if the pump is mechanically or electrically driven.
Regards,
Jos Okhuijsen
Visit - www.EuropaOwners.org
Message 4
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Subject: | Re: Secondary Fuel Pump, correct or not |
Hi Jos
"How do you calculate that?" (failure because of failed Andair 1 way
valve)
I will first mention that my 1988 R100GS BMW motorcycle with type 64 Bing
Carbs has a vacuum controlled valve that turns off fuel to carbs when
there is no vacuum. Let bike sit with MoGas with Stabil (fuel stablizer)
(with carbs run dry) and that valve glues itself closed! Valve is not too
unlike the Andair 1 way valves used by Europa on 914. A very light
pressure to open when working correctly, but 100PSI will not open if glued
shut. Carb cleaner and air can unstick, but almost unbelievable how it can
get so stuck. I have not heard of Andair 1 ways sticking opened or closed,
but my dart throw is sticking closed with MoGas use and sitting plane is
good possible failure.
OK here are some failures Europa 914 series with bypass and 2 filters (or
2 gasculators)**:
**Glue both valves shut, pump #1 on will have a hard time getting through
#2 pump that is off or failed (if both pumps on and they are working will
run OK)
**Glue both valves shut, if #1 pump fails or is off or #1 filter or
gasculator clogged, #2 pump will not provide
**#2 pump fails or is off and #1 valve stuck opened no fuel flow from pump
#1 will be supplied
**#1 pump fails or is off and #2 valve opened no flow from pump #2 will be
supplied
After fooling with system:
http://contrails.free.fr/engine_914_fuel_syst_test_en.php
Good idea to use P1 as primary pump, and good idea to be able to turn off
P1 and run just P2 to test system. If wired so P1 always running you could
not really test #1 valve or #2 filter or Gasculator.
I am using 2 Andair gasculators instead of supplied filters:
http://www.europaowners.org/modules.php?set_albumName=Begin-06-2003&op=modload&name=gallery&file=index&include=view_album.php
See:
Album: 914 modular fuel system. Series with bypass, two Andair 375s.
Another very real failure is having an air leak in Gasculator or Filter!
On my system if I pushed up on one of the beautiful Stainless Steel Andair
bowl drains, just the tiniest bit, either pump #1, or #2 or both #1+#2
would far rather suck air than fuel and foam right away! Thats right, does
not matter Gasculator #1 valve or Gasculator #2 valve, a small leak will
kill fuel flow! Although nice drain, it still relies on an O-Ring to seal.
Worth a very close look before flight no fuel is leaking from those
Gasculator drains, and very careful monitor you have differential pressure
on both pumps, checking 1 pump at a time at high MP.
As one of my tests was to see and touch and feel for my self how the pumps
will perform with a suction head. I noticed that if you create a very
small air leak at either of the Gasculators, it is far more devistating
the greater the suction head. In other words full fuel and nose not too
high will be nowhere near as hard as low fuel level and high nose.
Ron P.
Message 5
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Subject: | Re: Aileron Trim servo |
I remember seeing this trim setup for another airplane and decided to do the same
for the Europa. I think it was on an RV-6 or 9. I tried looking through my
URL that I have saved, but could not find it. I don't think it would be to
hard to set it up. I'm working on the cockpit module now and will be installing
the aileron push rod in the next couple of weeks. That was one of the mods
I will be making. I did not like like the trim out on the aileron and covered
it back up. I'll sent you some of the pictures as I start to work on it.
craig bastin <craigb@onthenet.com.au> wrote: Can someone point me in the
right direction to an article i saw (here i think) where someone had made a
composite "horse shoe" spring an attached it to the aileron push rod under the
cockpit module along
with a small servo
thanks
craig
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