[ARC5] An Interesting Failure Mode

[J Mcvey]

so...what did they do to fix it? 
Change  the fanchange the fan bladereduce the fan voltage
install a baffle 
shield the tube?Scrap the whole system and design a new one?
 

    On Monday, December 12, 2016 8:14 PM, Jay Coward via ARC5 <arc5 at mailman.qth.net> wrote:
 

 That's what happens when you name a system after a musical instrument...Jay KE6PPF   -----Original Message-----
From: Robert Eleazer <releazer at earthlink.net>
To: arc5 <arc5 at mailman.qth.net>
Sent: Mon, Dec 12, 2016 3:09 pm
Subject: [ARC5] An Interesting Failure Mode

I was just reading about the use of the Oboe navigation system by the RAF in WWII.  They proved the system out in Wellington bombers and then switched to using Mosquito bombers, where they kept having failures, a tube would seem to explode.   The problem turned out to be due to the higher altitude used by the Mosquito, 20,000 ft rather than the 10,000 ft of the Wellington flights.  At the higher altitude a cooling fan, which used a Hoover vacuum cleaner motor, would turn faster due to the thinner air.  The higher RPM would reach resonance with a certain tube in the Oboe equipment, which would shatter. WayneWB5WSV           ______________________________________________________________
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