Thanks, Ian - a very useful contribution! Kind regards
Bernard > On 5 Mar 2017, at 10:58 pm, Ian Mc Phee <[email protected]> wrote: > > I like 18gauge aviation wire for single seaters and prefer 16gauge for 2 > seaters so guess rear fin battery may need 14gauge.. Fuse quality can also > cause voltage drop and in rare occasions switches. With 3 batteries I like > a C&K 7211 switch which you can call ON ON ON a 3 position switch. > > Personally I would look for 0.2 volts maybe 0.3 volts drop when transmit > between volts at battery and volts at instrument panel. A few years ago > there was a German factory wired glider had 1volt drop between battery and > panel and it had its battery at the base of the panel so very short wire run. > The owner was shocked > > Re aerial wire I like RG400 rather than the more usual RG58 but it is > expensive. Regretfully when a glider gets a broken back on several occasions > the coax is stretched considerably. . The coax is repaired but the SWR is > not checked > > Ian McPhee > 0428847642 > Box 657 Byron Bay NSW 2481 > > On 5 Mar 2017 1:13 pm, "Mike Borgelt" <[email protected] > <mailto:[email protected]>> wrote: > Well you can size the wiring properly by referring to the tables in AC43. > > Nobody here seems to know what reference the German glider manufacturers use, > if any. Bernard could presumably just ask Schleichers. > > In any case, just measure at the battery terminals and at the instrument with > the same load. As Bob Dircks says, there can be drop in switches, connectors > and fuses. > > In any case what matters operationally is what voltage appears at the > instrument because that is what will stop it working when it gets too low. So > I'd just set the offset to zero. > > I've seen too many dodgy wiring installations. If you have to wiggle the > connector to get it to work it is no good and probably won't work for long. > > In one memorable instance about 20 years ago a club had some vario problems. > After investigating they found 12 volts at the battery and 8 volts at the > instrument. > > After re-wiring they let me know that everything now worked fine, including > the radio which hadn't been working properly SINCE THE FIRE DOWN THE BACK 18 > MONTHS BEFORE. > > Mike > > > > > > > > > > At 11:38 AM 3/5/2017, you wrote: >> naturally the germans involved would...ask a silly question, even a rhetoric >> one. >> >> >> >> On 5 Mar 2017, at 11:58 AM, Mike Borgelt < [email protected] >> <mailto:[email protected]>> wrote: >> >>> Refer to AC43 but measure anyway. >>> >>> Who knows what the German glider manufacturers do with wiring. >>> >>> Mike >>> >>> At 10:52 AM 3/5/2017, you wrote: >>>> Hi Bob >>>> >>>> Many thanks for your quick reply. >>>> I realise that the size of the wiring comes into it but I was working on >>>> the assumption that >>>> the electronic specialists amongst us would know what wiring the >>>> manufacturers usually >>>> use for this applications. >>>> >>>> BTW, I’m not blaming the wiring, I just need to arrive at a realistic >>>> figure for the offset in >>>> my LX 9000. >>>> >>>> Kind regards >>>> >>>> Bernard >>>> >>>> >>>>> On 5 Mar 2017, at 11:11 am, Bob Dircks <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> In order to calculate the voltage drop, we would need to know the exact >>>>> conductor size of the wiring. >>>>> Of course the circuit is actually going to be 22m in length. >>>>> You can (fairly) easily measure the voltage drop with a voltmeter, to >>>>> measure the voltage at both locations while the load is applied. >>>>> Normally one would not expect a significant drop at 0.9 A over 11m of a >>>>> wire chosen carefully for the job. >>>>> >>>>> However, all joints in the wiring, including switches and breakers need >>>>> to be considered, before blaming the wiring. >>>>> >>>>> Bob Dircks >>>>> >>>>> On Sun, Mar 5, 2017 at 11:32 AM, Future Aviation Pty. Ltd. >>>>> <[email protected] <mailto:[email protected]> > wrote: >>>>> Good morning all >>>>> Today I have a question for the electronic specialists on this forum. >>>>> My new ASH 30 Mi has approx. 11m of electrical cable between the avionics >>>>> battery in the top of the fin and the front instrument panel. >>>>> What voltage drop can be expected at the panel if the combined avionics >>>>> draw approx. 900 mA? >>>>> This information would be helpful to properly adjust the voltage offset >>>>> in the LX 9000. >>>>> Many thanks in advance for your help and assistance. >>>>> Bernard >>>>> >>>>> _______________________________________________ >>>>> Aus-soaring mailing list >>>>> [email protected] <mailto:[email protected]> >>>>> http://lists.base64.com.au/listinfo/aus-soaring >>>>> <http://lists.base64.com.au/listinfo/aus-soaring> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Aus-soaring mailing list >>>>> [email protected] <mailto:[email protected]> >>>>> http://lists.base64.com.au/listinfo/aus-soaring >>>>> <http://lists.base64.com.au/listinfo/aus-soaring> >>>> _______________________________________________ >>>> Aus-soaring mailing list >>>> [email protected] <mailto:[email protected]> >>>> http://lists.base64.com.au/listinfo/aus-soaring >>>> <http://lists.base64.com.au/listinfo/aus-soaring> >>> Borgelt Instruments - design & manufacture of quality soaring >>> instrumentation since 1978 >>> www.borgeltinstruments.com <http://www.borgeltinstruments.com/> >>> tel: 07 4635 5784 overseas: int+61-7-4635 5784 >>> mob: 042835 5784 : int+61-42835 5784 >>> P O Box 4607, Toowoomba East, QLD 4350, Australia >>> _______________________________________________ >>> Aus-soaring mailing list >>> [email protected] <mailto:[email protected]> >>> http://lists.base64.com.au/listinfo/aus-soaring >>> <http://lists.base64.com.au/listinfo/aus-soaring>_______________________________________________ >> Aus-soaring mailing list >> [email protected] <mailto:[email protected]> >> http://lists.base64.com.au/listinfo/aus-soaring >> <http://lists.base64.com.au/listinfo/aus-soaring>Borgelt Instruments - >> design & manufacture of quality soaring instrumentation since 1978 > www.borgeltinstruments.com > <http://www.borgeltinstruments.com/>tel: 07 4635 5784 overseas: > int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > > _______________________________________________ > Aus-soaring mailing list > [email protected] <mailto:[email protected]> > http://lists.base64.com.au/listinfo/aus-soaring > <http://lists.base64.com.au/listinfo/aus-soaring> > > _______________________________________________ > Aus-soaring mailing list > [email protected] > http://lists.base64.com.au/listinfo/aus-soaring
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