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Great to hear of an uneventful flight - all should be that way.
Regarding the electrical wiring - when you have a "loose" connection with perhaps only a few strands of wire actually connected and other strands sometimes making connection, both conditions could exist. As Dale indicated "blued" metal is an indication of high temperature caused by more current flowing through the few remaining connections (higher resistance = more power dissipated).
When some of the remaining loose strands make and break connections current will flow intermittently through these strands as they make contact and sparks will occur as these loose strand connections are made and broken due to the flexing.
This of course was the same concept used by the first radio transmitters which were simply spark generators used to generate a very wide spectrum of electromagnetic "noise" - some of which was in the radio spectrum. I've actually used a spark transmitter (for a short period) - back in my early, early youth before being discovered and informed by the FCC that such devices were illegal due to the wide spectrum of radio noise and interference they generate.
FWIW
Ed
----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 02, 2007 6:26 AM
Subject: [FlyRotary] Re: Uneventful flight
On Apr 2, 2007, at 12:12 AM, Dale Rogers wrote:
Bulent Aliev wrote:
crimp connector splice that was done by my electronics engineer neighbor, totally loose. The metal part inside was blue from heat (created from the sparking I guess?). So I had it fixed. The noise is gone and me and my flight captain are happy.
Hi All,
Arcing should be black pits, not a blued pin or socket. When a
connector is loose, it only makes contact on a very small portion of
the available contact surface, forcing all the current to go through
a very small point-of-contact. This is the same as trying to push 20
Amps through a #18 wire. It is called a high resistance connection.
What happens when current is pushed through an resistive object?
Heat is generated. Enough to turn the pin blue.
Dale R
COZY MkIV #1254
Dale, if there is no spark, what generated the radio noise?
Buly
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