AirEupora
Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA
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 Posted: Fri Jul 22, 2016 11:57 am Post subject: Europa-List Digest: 4 Msgs - 07/21/16 |
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Made it to KEVW. Evanston, WY
KDWA KBAM KEVW 7:05 to 12:18
Sent from my iPhone
| Quote: | On Jul 22, 2016, at 1:03 AM, Europa-List Digest Server <europa-list(at)matronics.com> wrote:
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Europa-List Digest Archive
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Total Messages Posted Thu 07/21/16: 4
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Today's Message Index:
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1. 07:25 AM - Re: Non lifting weight allowance (rampil)
2. 08:01 AM - Re: New Panel - Master/Ignition Switches (rampil)
3. 08:47 AM - Re: Are you ready to takeoff for Oshkosh (Erich Trombley)
4. 08:47 AM - Re: New Panel - Master/Ignition Switches (italianjon)
________________________________ Message 1 _____________________________________
Time: 07:25:11 AM PST US
Subject: Re: Non lifting weight allowance
From: "rampil" <ira.rampil(at)gmail.com>
Hi Wladimir, could you please clarify what you mean by "non-lifting weight allowance"?
I think it is fair to say that most of the long wing aircraft are in
the US, and your term is unfamiliar (to me at least). I have a set of long wings
but have yet to fit them to my fuselage, and so have not done a Weight & Balance
with them yet.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458480#458480
________________________________ Message 2 _____________________________________
Time: 08:01:05 AM PST US
Subject: Re: New Panel - Master/Ignition Switches
From: "rampil" <ira.rampil(at)gmail.com>
Hi Jon,
Here are my thoughts regarding standard power and ignition switches.
First, recognize that you are talking about four separate circuits here:
1) Master Buss Contactor power
2) Alternator Field power
3) Magneto Grounds
4) Starter Contactor
In commercial light aircraft, these are usually grouped into two physical switch
units. The standard keyed, rotary ignition (plus starter) switch is extremely
robust and rugged and very unlikely to fail as befits a life-safety control.
It is also quite compact in terms of panel space when compared with your proposal
of replacing it with three separate switches, which if they are small will
have minute contact areas compared with the big rotary. Small contact areas
= short service life. The advantage to your proposal is possibly reduction in
price and a minute advantage in weight. Just because Rotax draws the ignition
circuit as two separate switches, does not imply that they do not favor standard
aviation practice, as opposite to standard snowmobile practice. As for reliability,
consider the relative reliability of three hobbyist grade switches for
ignition/start vs a "bulletproof" AN spec'd part. In my Europa, I have a Bendix
rotary plus a separate push button starter switch. The duty cycle on the
start button is minute, but I have selected a part with can easily handle the
800 mA start Contactor load.
The two power contractors are usually controlled by single pole on-off switches
which can vary in form factor, i.e., bat / toggle, rocker, etc. In my PA-22,
there are no contactors (Mr Piper was cheap). In this case the Master Power switch
is On-Off-On, in case one side of the switch fails. Back to the standard
arrangement: It is usually thought to be convenient to semi-gang them since
except for very trouble shooting they operate together.
For clarification, there is no such thing as a "standard pole" switch. The term
pole refers to the number of circuits controlled by the switch , eg, one pole,
double pole, 11-pole.
I hope this helps set out the design issues for this part of panel design.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458483#458483
________________________________ Message 3 _____________________________________
Time: 08:47:07 AM PST US
From: "Erich Trombley" <erichdtrombley(at)juno.com>
Subject: RE: Are you ready to takeoff for Oshkosh
Hi Bud, Sorry to hear of your starter problem. I took an early flight t
his morning in preparation for OSH. I had made a couple of modifications
that I wanted to prove out. I must admit I didn't sleep very well wond
ering if the Gremlins would come out to play as they did for you. I am
happy to report all went well. Beautiful sunrise over Las Vegas. I am p
lanning to arrive at OSH late Saturday afternoon, weather permitting. C
an't wait to catch up with all of the Europa builders and flyers. Safe t
ravels to all. Erich TrombleyN28ET Classic Mono 914 Bud wrote:In the r
ush to get your bird ready, don’t cut corners, have a safe flight
or drive and bring your shopping list.
See you all on or about Sunday afternoon.
I was looking at the weather and did my flight planning. I’m read
y to go... Well sort of. I went for a confidence flight today (which did
n’t raise my confidence) in preparation for leaving on Thursday to
visit my Mom on the way up. Over the last three months 12AY has been fl
ying great. In preparation for the Thursday departure I changed the oil,
and put in a new battery yesterday, however, my confidence flight went
poorly today as 12AY wouldn’t start at all (starter now removed as
it is spinning at only 250 rpm on crank, unless charged to 13 volts, an
d on disassembly one nut was found stripped and the armature was coated
with baked on grease due to a worn front seal (only 400 hours). I had a
poor mag check (350 drop initially and 300 after running it up) so I pul
led the right carb to get to the starter anyway, and found a leaking rig
ht carb bowl, I hope I have the “O” ring. I could smell gas
in the cockpit and noted I developed a small fuel leak at the vent hose
fitting (I tightened the clamp and it seemed to work). The climb and cru
ise checks to 10,000 went well but the fuel low light came on at 17 gall
ons (I hope all I need to do is reset parameters on my fuel totalizer).
Worse yet my wife says I have to buy some new clothes with her tomorrow
evening. So it will be a long, long, day tomorrow, but I am really looki
ng forward to seeing you all. If the plane cannot be repaired and operat
e at 100% by tomorrow on its confidence flight, I’ll drive up in t
he car.
I’m heeding my own advice to be safe and not cut corners.
See you all there!
Bud Yerly
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________________________________ Message 4 _____________________________________
Time: 08:47:50 AM PST US
Subject: Re: New Panel - Master/Ignition Switches
From: "italianjon" <jon.catilli(at)gmail.com>
Hi guys,
Interesting food for thought.
So it sees that there is no formal reason not to do what I would like to do, but
a fair technical point.
Panel space should not be a problem, as I am cleaning up the "small lower panel"
by removing the currently installed engine instrumentation and that is going
into a single EMS Xtreme from MGL on the centre panel.
But yes, the reliability is worth thinking about.
The main point that got me started down this "thought route" is why can we turn
on our aircraft without a key, but you can't with the car... I started to think
would it not be better to put the battery on the key and then everything else
on simple toggle switches.
A third point that came up today in a discussion I had at work about this is one
of human factors... if I make my aircraft too different that does introduce
risk when I fly something else. (I sometimes rent the club aircraft, when I need
more than 2 seats)
I am going to keep thinking on this one... some good points raised so far 
Regards
Jon
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458486#458486
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