Today's Message Index:
----------------------
1. 06:35 AM - Re: Rotax 912 electronic noise (Richard Lamprey)
2. 07:35 AM - Craig Bastin/William Daniel (Fergus Kyle)
3. 11:39 AM - Re: Craig Bastin/William Daniel (craig bastin)
4. 01:20 PM - Re: Rotax 912 electronic noise (Jan de Jong)
5. 02:46 PM - Re: Rotax 912 electronic noise (rampil)
6. 03:30 PM - Re: Re: Rotax 912 electronic noise (Tim Ward)
7. 03:43 PM - GRT Coolant Temperature Fixture (rlborger)
8. 05:18 PM - GRT Coolant Temperature Fixture (rlborger)
Message 1
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| Subject: | Re: Rotax 912 electronic noise |
Thanks Craig and Mike for your inputs. I have limited knowledge of
electrics, but my thoughts about the sudden jump from 12 V to 14 Volt
are that after startup the vast 22,000 microfarad capacitor is soaking
up voltage until it has reached full capacitance; only after full
capacity is reached, the system achieves the full 14 Volts, and the
sudden jump occurs. If the engine has been run in the last couple of
days, the system reaches 14 Volts immediately, since the capacitor has
not in the short time 'bled' its charge. The delay and jump only occur
after the system has sat without running for a long while.
The same applies to the mysterious noise, ie doesnt occur after recent
running... but I will apply my stethoscope to the regulator to see if
thats the source.
Yes weather here is fine, lovely sunshine all day! But the politics and
post election violence has been disastrous for the country (as you may
have seen on TV).
Regards to all
Richard
Message 2
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| Subject: | Craig Bastin/William Daniel |
Gentlemen,
I am interested in your discourse regarding boosting a 912, but
could you possibly do so without archiving a month of exchanges/?
My pages are about 32 lines each and between the three messages (#3
- #5 incl) on today's list, there are 589 lines or about 196 lines average
per message. I would guess the Matronics FAQ covers this well and
respectfully ask you to cut back the archives.
Regards for 2008
Ferg Kyle
Message 3
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| Subject: | Craig Bastin/William Daniel |
ok sorry about that, basically you want us to cut all the previous stuff out
and go with just the
answer yes.
craig
-
1:40 AM
1:40 AM
Message 4
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| Subject: | Re: Rotax 912 electronic noise |
Hallo Richard,
Forget about the capacitor. At 14 volts it can only hold 14 x 0,022 =0,3
Coulombs. A 10A source charges it in 0,3 / 10= 0,03 seconds.
Your only large "capacitor" is the battery. If might support a 10A
charging current for a little while, drawing down the bus voltage, but
12V seems low.
Regards,
Jan de Jong
Richard Lamprey wrote:
> Thanks Craig and Mike for your inputs. I have limited knowledge of
> electrics, but my thoughts about the sudden jump from 12 V to 14 Volt
> are that after startup the vast 22,000 microfarad capacitor is soaking
> up voltage until it has reached full capacitance; only after full
> capacity is reached, the system achieves the full 14 Volts, and the
> sudden jump occurs. If the engine has been run in the last couple of
> days, the system reaches 14 Volts immediately, since the capacitor has
> not in the short time 'bled' its charge. The delay and jump only
> occur after the system has sat without running for a long while.
>
> The same applies to the mysterious noise, ie doesnt occur after recent
> running... but I will apply my stethoscope to the regulator to see if
> thats the source.
>
> Yes weather here is fine, lovely sunshine all day! But the politics
> and post election violence has been disastrous for the country (as you
> may have seen on TV).
>
> Regards to all
> Richard
> *
>
>
> *
Message 5
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| Subject: | Re: Rotax 912 electronic noise |
Hi Richard,
I am not sure that probabilities favor the electrics hypothesis.
Most electronics without moving parts remain quite silent unless they
are in the terminal stage of releasing their electronics, steam and smoke.
Have you ruled out air, coolant, or oil flowing through some constriction?
Carbon pile voltage regulators could make noise as the carbon heated,
but I think that species went extinct in the 1960s.
Best of Luck!
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=158640#158640
Message 6
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| Subject: | Re: Rotax 912 electronic noise |
Richard,
Maybe Vacuum pump, or air driven Artificial Horizon or Directional Indicator
or electrical Turn and Slip?
Best of Luck.
Tim
Tim Ward
12 Waiwetu Street,
Fendalton,
CHRISTCHURCH 8052
NEW ZEALAND
Ph :64 03 3515166
Mob: 021 0640221
email:
ward.t@xtra.co.nz
----- Original Message -----
From: "rampil" <ira.rampil@gmail.com>
Sent: Thursday, January 17, 2008 11:43 AM
Subject: Europa-List: Re: Rotax 912 electronic noise
>
> Hi Richard,
>
> I am not sure that probabilities favor the electrics hypothesis.
> Most electronics without moving parts remain quite silent unless they
> are in the terminal stage of releasing their electronics, steam and smoke.
>
> Have you ruled out air, coolant, or oil flowing through some constriction?
>
> Carbon pile voltage regulators could make noise as the carbon heated,
> but I think that species went extinct in the 1960s.
>
> Best of Luck!
>
> --------
> Ira N224XS
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=158640#158640
>
>
>
Message 7
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| Subject: | GRT Coolant Temperature Fixture |
Apple-Mail-15-1028816395--
Message 8
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| Subject: | GRT Coolant Temperature Fixture |
All,
Well, poo...
Guess that last posting didn't work. So much for trying to send a pic.
You can see the pics of the Grand Rapids Technology Coolant
Temperature Fixture on my build web site (URL in my signature
block). Go to the last album at the bottom of the page. This is a
single fixture. They also have a dual fixture with two threaded
openings, presumably for temperature and pressure.
Good building and great flying,
Bob Borger
Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S
http://www.europaowners.org/N914XL
(90%) tail kit done, wings closed, cockpit module installed, pitch
system in, landing gear frame in, rudder system in, outrigger mod in,
Fuselage Top on, lift/drag/flap pins in, wing incidence set, tie bar
in, flap drive in, Mod 70 done. Baggage bay in. Flaps & Main Gear
complete. Mod 72 complete. Instrument panel complete, except for
testing. Rotax 914 installed (for the 3rd time). Airmaster Prop
installed. Electrical complete, except for testing. Fuel system
complete except for testing. Working in - 32 Tail, 34 Door Latches &
35 Doors, 37 Interior & Finishing. Airmaster arrived 29 Sep 05.
Seat arrived from Oregon Aero. E04 interior kit has arrived and is
being installed.
3705 Lynchburg Dr.
Corinth, TX 76208
Home: 940-497-2123
Cel: 817-992-1117
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