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By: - 6th March 2012 at 17:18 Permalink - Edited 1st January 1970 at 01:00
Well they certainly used B-17's, B-24's, B-25's and B-26's to name a few as bombers, of which all were 24V.
I'd has it at a very good guess that certainly most, if not all of the american produced machines were all 24V.
By: - 6th March 2012 at 17:25 Permalink - Edited 1st January 1970 at 01:00
24V is standard on most larger aircraft. 12V for the small stuff.
By: - 6th March 2012 at 18:53 Permalink - Edited 1st January 1970 at 01:00
Early war RAF aircraft were 12 volt - I think the change to 24 volt came later on in the conflict. The Whitley was 12V.
By: - 6th March 2012 at 18:57 Permalink - Edited 1st January 1970 at 01:00
so was the Wellington I think Elliot................
By: - 6th March 2012 at 19:16 Permalink - Edited 1st January 1970 at 01:00
so was the Wellington
Only up to about MK X, I think (maybe even Mk. III).
I phrased that badly....I meant to say the Wellington was 24V from the Mk. X or maybe even earlier, in the Mk. III
By: - 6th March 2012 at 19:42 Permalink - Edited 1st January 1970 at 01:00
I always find electrics to be a dark art, but weren't the American bombers essentially 28v systems?
By: - 6th March 2012 at 19:47 Permalink - Edited 1st January 1970 at 01:00
... and as a direct answer to the question "Where can I find (detailed technical information on particular aircraft", the answer MUST be to locate maintenance manuals relevant to the aircraft, or someone with access to such, and consult them.
By: - 6th March 2012 at 20:07 Permalink - Edited 1st January 1970 at 01:00
Good advice JT,
B-17F, G http://www.scribd.com/doc/50649178/Pilots-Manual-for-Boeing-B-17-Flying-Fortress
Which when I retrospectively went in search for answers to my question I found are 24V basic systems!
Strange, in my view of post there are two links to B-17 & B-24 manuals, but only one shows when posted:confused:
By: - 6th March 2012 at 20:34 Permalink - Edited 1st January 1970 at 01:00
As has been said, some of the earlier aircraft had 12V DC systems but soon 24V DC became the norm - twice the voltage = half the current (Amps) for heavy loads such as engine starter motors. Engine driven generators had outputs of 28V to provide a charging voltage for the battery.
Other voltages are also present, typically 26V AC and 115V AC which were used for systems like remote compass (where a DC supply would have a magnetic effect) and gyro instruments where induction motors could be useful (no brush gear). These AC voltages were provided by 'inverters' that changed the DC supply to AC either for busbar distribution or for dedicated system use.
Nowadays (just for interest) all engine driven generators on larger aircraft are 115/200V AC devices of either fixed (pay attention Pagen, I will be asking questions later) or 'wild' frequency. The fixed frequency is 400Hz, the 'wild' frequency depends on engine speed. 24/28VDC is still used on smaller types.
Yes, electrical systems are my forte in life. Black art, and all that. Just great when no body knows what you are doing. And the airframes are only there to carry the electrics - who said that? :dev2:
By: - 6th March 2012 at 20:35 Permalink - Edited 1st January 1970 at 01:00
I always find electrics to be a dark art,
That's because in Britain a lot of it was made by Joseph Lucas - the Prince of Darkness.:D
By: - 6th March 2012 at 21:05 Permalink - Edited 1st January 1970 at 01:00
(pay attention Pagen, I will be asking questions later)
26V AC .... zzzz
er, um 115V AC remote comp... zzzz,
ah, where a DC supply would have a magnetic effect... zzz
I'm with you all the way Fieldhawk!
Nice one Aeronut, reminds me of my Rover days!
By: - 29th March 2012 at 15:35 Permalink - Edited 1st January 1970 at 01:00
Many thanks for your replies. Sorry not to have replied earlier but have just had some repairs to the left undercarriage (new hip) and have been denied access to the net. Paul
By: - 29th March 2012 at 18:39 Permalink - Edited 1st January 1970 at 01:00
:) Hope you are on the mend and full retraction checks were carried out satisfactory.
Posts: 11
By: PBT - 6th March 2012 at 10:27
Anyone out there know where to find what voltage the main electrical systems/instruments were on the bombers used by the RAF during WW2? I know the Lanc & Mosquito both used 24V for most of their instruments. What about the rest?:confused: