Re: ignition coil - aside reaction - last comment

From: 	William Noble[SMTP:William_B_Noble-at-msn-dot-com]
Sent: 	Thursday, July 24, 1997 4:45 PM
To: 	Tesla List
Subject: 	RE: ignition coil - aside reaction - last comment

just to complete the discussion here, the only aircraft I can speak to with 
great authority is the L-1011.  I have personally measured the "28V" power 
busses with the engines not running and they do measure 28V.  As I recall the 
power system spec (and I don't have it here in my hotel room), the minimum 
voltage was about 25, for a few milliseconds.  I believe that the extra 4 
volts may come from NiCd in lieu of lead/acid batteries - certainly the 
batteries for the INS system were NiCd (I never personally inspected the main 
28V batteries).  I also have the specs for Boeing 7X7 aircraft, but I have not 
personally measured the DC busses in Boeing aircraft.  I have personnaly 
measured the 28VDC on the B-1 flight test vehicle (and yes, it too was 28V).  
If I remember right (and this is going back 15 years), the 28V is produced by 
a bridge rectifier driven by 400Hz 26VAC (which is the standard excitation 
voltage for synchro resolvers)

Perhaps, since this discussion is not of much relevance to tesla coils, we can 
agree that some aircraft have 28V systems?  

-----Original Message-----
From:	Tesla List 
Sent:	Friday, July 25, 1997 3:05 AM
To:	'Tesla List'
Subject:	Re: ignition coil - aside reaction

[bill]  big snip 

Aircraft electrical systems are 24VDC the same way automotive systems
are 12 and 6VDC. The 28 volt is the charging voltage. The batteries are
24 volt.
Kenneth C. Pryor
Modular Mining Systems
3289 E. Hemisphere Loop
Tucson, AZ 85706
email: pryor-at-mmsi-dot-com
internet:  http://www.mmsi-dot-com