Bill,
I don't have an EM-2, but I log the bus voltage (among other things) every 3 seconds on every flight with a data logger of my own design. On a 1.5 hr flight today, the bus voltge slowly drifted from 13.6 to 14.0 which seems to correlate to the under cowl
temperature. The short term variation as indicated from one reading to the next is 0.1 volt or less. The majority of the time, the voltage was 13.8 to 14.0. This is with a stock 1986 RX7 internally regulated alternator, a single PC680 battery, and the normal
engine support systems and strobes operating.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]
Sent: Saturday, July 21, 2012 12:13 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Voltage fluctuation.
How solid should the buss voltage reading be on the EM-2? My voltage seems to float over about a half volt. I don’t know if there is something wrong with my
voltage regulator or if this is normal. What do you guys see?
Bill B