Today's Message Index:
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1. 04:19 AM - Re: Re: AC powered fin strobe (Jan de Jong)
2. 07:07 AM - G-UMPY (Mike Gamble)
3. 01:17 PM - Re: first flight of G-UMPY Sywell (PHILLIPS I)
4. 01:53 PM - Excellent tailplane modification designed by Pat Tunney (GBWFH2010)
5. 03:30 PM - Re: Excellent tailplane modification designed by Pat Tunney (Paul McAllister)
6. 10:01 PM - Re: AC powered fin strobe (Richard Lamprey)
Message 1
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Subject: | Re: AC powered fin strobe |
Voltage regulator is a "rectifier-regulator".
It is a "full wave rectifier" with 2 of the 4 diodes replaced by SCRs
(thyristors).
All output current is supplied through the 2 alternating sets of 1 diode
and 1 thyristor in series.
The voltage drop across these when they conduct (ideally zero)
determines the loss.
The peak current through these is a multiple of output current because
they conduct only a small fraction of the time. The peak current is
limited by the internal resistance of the alternator coils and the
internal resistance of the output storage capacitor.
See forward voltage at 50 A and 100 A for the SCR:
http://www.datasheetcatalog.org/datasheet/on_semiconductor/2N6504-D.PDF
See forward voltage at 50 A and 100 A for the diode:
http://www.datasheetcatalog.org/datasheet/on_semiconductor/MR2500-D.PDF
Ballpark voltage drop is 3 to 4 volts - 21 to 28% of output volts. Heat
dissipation as a percentage of output power (watts) is the same number.
From the datasheets it is clear that the voltage drop and therefore
loss percentage increases quite progressively with high and increasing
current.
If you can power a 40 W strobe directly from AC you may save 10 W or so
in heat generation in the voltage regulator.
Cheers,
Jan de Jong
Message 2
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Congrats Graeme,
That's another milestone passed.
More fun to come.
Mike
G-CFMP
Message 3
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Subject: | Re: first flight of G-UMPY Sywell |
Very well done Graeme, Hope to see you at some of the rallies in the new
year,
All your hard work will repay it self tenfold in the shear pleasure of
flying a aircraft you
built your self,
best wishes
Ivor Phillips
On 12 December 2011 02:45, Kingsley Hurst <kingsnjan@westnet.com.au> wrote:
> kingsnjan@westnet.com.au>
>
> Congratulations Graeme and all the best for many enjoyable hours of flying
> in the future.
>
> Gee, mine must be close to being the only Classic yet to fly!!
>
> Best regards
> Kingsley in Oz
>
> Do not archive
>
> Sent from my iPhone
>
> On 11/12/2011, at 11:08 PM, "graeme bird" <graeme@gdbmk.co.uk> wrote:
>
> >
> > inaugural flight of G-UMPY yesterday and Sywell, at the capable hands of
> Andy Draper.
> > Sounds fantastic going overhead, dont know why it should sound any
> different to any other 912 engined plane.
> > "A good one" the man said.
> > However, on inspection after today's flight the Port water downpipe to
> the radiator is too close to the exhaust. I'll need to move the raditor/air
> guide down and back slightly and maybe use a silicone pipe or add
> insulation somehow. Its a classic body with XS FWFD anyone else had this
> issue?
> >
> > --------
> > Graeme Bird
> > G-UMPY
> > Mono Classic/XS FWFD 912ULS/Warp drive FP
> > Build nearing completion
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=360665#360665
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
Message 4
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Subject: | Excellent tailplane modification designed by Pat Tunney |
At the annual inspection the amount of play in my tailplane was deemed to be unacceptable
and the LAA confirmed remedial action was required. I looked at all
the options available and decided to go with LAA Mod SM 11906 as designed by
Pat Tunney. This solution replaces the original bolts secured with split pins
by bolts secured by precisely engineered clamps that fit around the torque tube.
I have to say Pat Tunney was extremely helpful and gave me a huge amount of support
with this project . He supplied the clamps and the new pins and arranged
for the clamps to be precisely machined to fit my torque tube.
The actual task of removing the torque tube was quite difficult as I had to do
all the work through the two side access panels. I am sure there are those who
can do this job quickly, but I found it a real struggle and it took me the best
part of a day. Fitting the re-engineered clamp solution was much easier and
the job was done in just under three hours, even though we were doing everything
slowly and carefully. I estimate that if the torque tube should need to be
removed for inspection the whole job could be done in half a day.
I now have a beautifully engineered solution and a rock solid tailplane. I think
Pat should be congratulated on coming up with such a good design.
I attach a picture of the installation in G-BWFH.
Gordon Grant
--------
Gordon Grant
G-BWFH
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360779#360779
Attachments:
http://forums.matronics.com//files/modified_2_resize_314.jpg
Message 5
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Subject: | Re: Excellent tailplane modification designed by Pat Tunney |
Hi Gordon,
What is the cost of these clamps ?
Thanks, Paul
do not archive
Message 6
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Subject: | Re: AC powered fin strobe |
Many thanks for all the replies, especially Frans and Jan for their technical responses.
I attach again the simplified wiring diagram, showing the in series
connection, this diagram enclosed with the strobe, and also re-confirmed with
the original manufacturer Air-Tech Inc.
I am an ignoramus on electrical matters, so I'll close my eyes when making the
final connection and hope there isnt a big bang from the rectifier (obviously
this thing will only work when the engine is running). One reason I am a little
cautious is that Ducati rectifiers are not very consistent and reliable, and
having seen this one serve me well for about 7 years I would hate to wreck it.
All best
Richard
Europa Classic 168, Kenya
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360806#360806
Attachments:
http://forums.matronics.com//files/illusion_aircraft_strobe_from_aircraft_spruce_202.pdf
http://forums.matronics.com//files/illusion_simplewiring_wswitch_196.doc
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