Europa-List Digest Archive

Mon 12/12/11


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     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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    Time: 04:19:52 AM PST US
    From: Jan de Jong <jan_de_jong@casema.nl>
    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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    Time: 07:07:42 AM PST US
    From: "Mike Gamble" <mp.gamble@talktalk.net>
    Subject: G-UMPY
    Congrats Graeme, That's another milestone passed. More fun to come. Mike G-CFMP


    Message 3


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    Time: 01:17:43 PM PST US
    Subject: Re: first flight of G-UMPY Sywell
    From: PHILLIPS I <ivor.phillips@ntlworld.com>
    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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    Time: 01:53:38 PM PST US
    Subject: Excellent tailplane modification designed by Pat Tunney
    From: "GBWFH2010" <gaxuk2010@gmail.com>
    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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    Time: 03:30:48 PM PST US
    Subject: Re: Excellent tailplane modification designed by Pat Tunney
    From: Paul McAllister <paul.the.aviator@gmail.com>
    Hi Gordon, What is the cost of these clamps ? Thanks, Paul do not archive


    Message 6


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    Time: 10:01:56 PM PST US
    Subject: Re: AC powered fin strobe
    From: "Richard Lamprey" <lamprey.richard@gmail.com>
    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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