Today's Message Index:
----------------------
1. 05:17 AM - Re: issues with Rotax 914 voltage regulator/rectifier? (nigelcharles@tiscali.co.uk)
2. 08:01 AM - Re: 912S with the Classsic (Ron Jones)
3. 09:12 AM - Flap Switch Wiring (JEFF ROBERTS)
4. 09:24 AM - Re: issues with Rotax 914 voltage regulator/rectifier? (Fred Fillinger)
5. 10:45 AM - Re: 912S with the Classsic (Duncan McFadyean)
6. 12:32 PM - Re: Flap Switch Wiring (Sidsel & Svein Johnsen)
7. 01:39 PM - Re: 912S with the Classsic (David Watts)
8. 10:44 PM - Re: issues with Rotax 914 voltage regulator/rectifier? (William Mills)
Message 1
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| Subject: | issues with Rotax 914 voltage regulator/rectifier? |
--> Europa-List message posted by: nigelcharles@tiscali.co.uk
There have been several aircraft with problems with the supplied regulator.
Others have managed to run OK for 100's of hours. One point to bear in mind
is that, if the earth connection to the case is less than perfect, higher
than normal voltages can result. This can damage the battery as well as the
regulator. The job of the regulator is made that much harder as there is
no field connection to a permanent magnet generator. This means the regulator
has to handle the whole output from the coils rather than controlling it
directly. On the positive side it means that there are no brushes or slip
rings to wear out. If you wish to protect the battery you may like to consider
using the crowbar overvoltage unit as sold by Bob Nuckolls. Details of this
mod are on the club website.
Nigel Charles
>-- Original Message --
>Date: Tue, 01 Mar 2005 12:06:20 -0600
>From: D Wysong <hdwysong@gmail.com>
>To: europa-list@matronics.com
>Subject: Europa-List: issues with Rotax 914 voltage regulator/rectifier?
>Reply-To: europa-list@matronics.com
>
>
>--> Europa-List message posted by: D Wysong <hdwysong@gmail.com>
>
>Has anyone with a Rotax 914 (perhaps 912, too?) had problems with the
>stock Ducati 12 V regulator/rectifier? Anyone found or heard of any
>good flying alternatives?
>
>I've read reports from motorcycle folks about the Ducati electronics
>failing due to overheating, but I haven't seen the like from the
>aircraft community. Surprised me considering some of the tight cowls
>we're using these days.
>
>Anyhow, I'm just trying to fix something that ain't broken (yet).
>
>Thanks!
>
>
Book yourself something to look forward to in 2005.
Cheap flights - http://www.tiscali.co.uk/travel/flights/
Bargain holidays - http://www.tiscali.co.uk/travel/holidays/
Message 2
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| Subject: | Re: 912S with the Classsic |
--> Europa-List message posted by: "Ron Jones" <jronjones@lineone.net>
Hi Troy,
I also have the Bendix type mag/starter switch on my panel but I have used
the spare terminal on the back to isolate one mag during starting. The
switch was, of course, originally made for the "older technology" engines
using traditional mags but that spare terminal does the same job with the
Rotax setup.
Just make up a short lead (about 4" long) and use it to bridge one of the
mag terminals to the spare. I forget which mag (A or B) is timed slightly
later than the other but you can try either mag by just switching the leads
at the connectors near the mags.
I have had no kick-backs in the 150 or so hours since I did the above to my
912S and I have only the original starter with a 14amp.hr. battery! The
aeroplane stood, on one accasion, for several weeks covered in snow and ice
and STILL started without charging the batt. or using jump-leads!
Do-it to-it - I'm sure you'll be glad you did!
Regards,
Ron Jones
(XS/912S, G-RJWX, No.359)
Message 3
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| Subject: | Flap Switch Wiring |
--> Europa-List message posted by: JEFF ROBERTS <jeff@rmmm.net>
Hi All,
If anyone could e-mail me a PDF of the flap switch drawing that shows
the switch wiring I would deeply appreciate it. I remember seeing this
but my avionics shop I'm using can't find it.
Thanks in advance,
Jeff
A258
In the final stages before going to the paint shop.
Do not archive.
Message 4
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| Subject: | Re: issues with Rotax 914 voltage regulator/rectifier? |
--> Europa-List message posted by: "Fred Fillinger" <n3eu@comcast.net>
> Nigel Charles wrote:
>
> There have been several aircraft with problems with the supplied
regulator.
> Others have managed to run OK for 100's of hours. One point to bear
in mind
> is that, if the earth connection to the case is less than perfect,
higher
> than normal voltages can result. This can damage the battery as well
as the
> regulator.
A poor connection -- pos or ground -- between the regulator and
battery will cause lower voltatge at the battery, not a higher
voltage. It acts as a current-limiting, series resistance, and a poor
connection of about 2 ohms can be sufficent to cause curent flow into
the battery to substantially cease. I presume it can cause higher
heat dissipation in a shunt-type regulator like the Rotax, though.
But no more than if a master bus for all your devices is switched off.
Reg,
Fred F.
Message 5
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| Subject: | Re: 912S with the Classsic |
--> Europa-List message posted by: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
<<I forget which mag (A or B) is timed slightly
> later than the >>
Both mags are the same on the 912 (S), unless one of your mags is weaker
than the other.
Duncan Mcf.
----- Original Message -----
From: "Ron Jones" <jronjones@lineone.net>
Subject: Re: Europa-List: 912S with the Classsic
> --> Europa-List message posted by: "Ron Jones" <jronjones@lineone.net>
>
> Hi Troy,
> I also have the Bendix type mag/starter switch on my panel but I have used
> the spare terminal on the back to isolate one mag during starting. The
> switch was, of course, originally made for the "older technology" engines
> using traditional mags but that spare terminal does the same job with the
> Rotax setup.
> Just make up a short lead (about 4" long) and use it to bridge one of the
> mag terminals to the spare. I forget which mag (A or B) is timed slightly
> later than the other but you can try either mag by just switching the
leads
> at the connectors near the mags.
> I have had no kick-backs in the 150 or so hours since I did the above to
my
> 912S and I have only the original starter with a 14amp.hr. battery! The
> aeroplane stood, on one accasion, for several weeks covered in snow and
ice
> and STILL started without charging the batt. or using jump-leads!
> Do-it to-it - I'm sure you'll be glad you did!
> Regards,
> Ron Jones
> (XS/912S, G-RJWX, No.359)
>
>
Message 6
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| Subject: | Re: Flap Switch Wiring |
--> Europa-List message posted by: "Sidsel & Svein Johnsen" <sidsel.svein@oslo.online.no>
Jeff,
It should be in your Builders Manual, Chapter 28 Flap control system and
rear baggage bay, fig. 8 (in trigear BM issue 1, at least).
In any event, here's the wiring:
6 contact points on the rear face of the switch:
1 2
3 4
5 6
12 V Positive to 3 - 5A c/b between main bus and this connection
12 V negative to 4
One cable to flap motor to 1
Other cable to flap motor to 2
Jumper cable from 6 to 1
Jumper cable from 5 to 2
If motor runs the wrong direction, either:
Rotate switch 180 degrees, or
Swap motor cables 1 and 2, or
Swap 12 V cables 3 and 4
Regards,
Svein
A225 - XS Trigear - now in Norway
----- Original Message -----
From: "JEFF ROBERTS" <jeff@rmmm.net>
Subject: Europa-List: Flap Switch Wiring
> --> Europa-List message posted by: JEFF ROBERTS <jeff@rmmm.net>
>
> Hi All,
> If anyone could e-mail me a PDF of the flap switch drawing that shows
> the switch wiring I would deeply appreciate it. I remember seeing this
> but my avionics shop I'm using can't find it.
> Thanks in advance,
> Jeff
> A258
> In the final stages before going to the paint shop.
> Do not archive.
>
>
>
Message 7
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| Subject: | Re: 912S with the Classsic |
--> Europa-List message posted by: "David Watts" <dg.watts@virgin.net>
Troy,
Having installed the 912S after a 1000hrs on the standard 912, I had no real
problems with the new engine until the weather turned a bit colder. I tried
a variety of the suggestions being put forward and have settled on leaving
the choke in until the engine is spinning over, then pulling it out. This
has completely solved all the kicking.
A short while ago I incorporated an extra switch to issolate one mag whilst
starting but that did not cure the kicking until I left the choke in again.
However I am sure having both mags off while the engine spins, then bringing
one mag in at a time would probably cure the problem and I intend to set up
this arrangement shortly when I receive my Airmaster prop to replace the NSI
CAP140 and have to rewire the panel anyway.
Dave Watts
G-BXDY
>From: "Troy Maynor" <wingnut54@charter.net>
> My questions are; will starting on one mag really help the anemic starter?
> How many of you are running the 912S with the standard starter and not
> having any problems starting? I really don't want to use a bigger battery
> but I may have to go that route. I am still a long way from actual testing
> but I need to get this panel wired. You know how it goes, the bridge you
> build today needs to hold you up when you eventually try to walk across
it.
> Can I get a few opinions on this to arrive at a consensus? Thanks to this
> valuable forum.
Message 8
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| Subject: | Re: issues with Rotax 914 voltage regulator/rectifier? |
--> Europa-List message posted by: "William Mills" <combined.merchants@virgin.net>
I had to replace mine at 375 hrs and then again at 740 hrs because of over
voltage. I was using the crowbar mod to protect the battery and avionics
and it kept tripping the circuit breaker. This stopped when the rectifier
was replaced on both occasions.
Best wishes,
William
----- Original Message -----
From: "D Wysong" <hdwysong@gmail.com>
Subject: Europa-List: issues with Rotax 914 voltage regulator/rectifier?
> --> Europa-List message posted by: D Wysong <hdwysong@gmail.com>
>
> Has anyone with a Rotax 914 (perhaps 912, too?) had problems with the
> stock Ducati 12 V regulator/rectifier? Anyone found or heard of any
> good flying alternatives?
>
> I've read reports from motorcycle folks about the Ducati electronics
> failing due to overheating, but I haven't seen the like from the
> aircraft community. Surprised me considering some of the tight cowls
> we're using these days.
>
> Anyhow, I'm just trying to fix something that ain't broken (yet).
>
> Thanks!
>
>
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