Bardample
I love flying!
- Joined
- Aug 18, 2013
- Messages
- 28
I fly a vfr Vans RV7a with a Classic 10 Skyview, now about 8 years old with 400 hrs on the clock. All readings have been stable until today.
I had an over speed indication of 2720 rpm on take off on three occasions today.I had previously adjusted the governor some time ago to keep the rpm max 2700 . This overspeed indication today is new. On climb out at full power the rpm gave readings of 3000-4500 for a-time before returning to my set rpm of 2400. My initial thoughts were a prop overspeed , but this was obviously incorrect.
A short time later in the flight with no increase in electrical load, my ammeter readings went from normal cruise 8-10 amps upto 30-40 amps for some minutes. My ammeter measures my B and C 40 amp Alternator ( about 2 years old) output to battery plus Buss . There is a B and C ext regulator installed. I have also installed a Monkworkz 30 Amp generator ( with reg) so that it is wired in parallel with the main Alt. The Monkworkz Gen is set to only provide power if the system voltage drops to 13.7 v. I monitor the Monkworkz current input into the Buss on the Skyview screen , so this is usually 0 amps , when the B and C does its job. As I have an Earthx 680 battery, I am used to seeing upto 40 amps of current at at start up only( the battery is ' hungry') , but not at cruise or climb.
I switched off my main alternator, but the Skyview amp reading still continued to read high 30-40 amps. I noted that after turning off the main alt, the Monkworkz amp out rose from zero to 9-10 Amps, as one would expect if the main alt was not providing power to the system. After a few minutes when I switched the main alt back online , my readings became 'normal'.
As the above abnormal readings are erroneous, I need advice about the cause and where to start looking.
thankyou in anticipation
Jeff R ( Australia)
I had an over speed indication of 2720 rpm on take off on three occasions today.I had previously adjusted the governor some time ago to keep the rpm max 2700 . This overspeed indication today is new. On climb out at full power the rpm gave readings of 3000-4500 for a-time before returning to my set rpm of 2400. My initial thoughts were a prop overspeed , but this was obviously incorrect.
A short time later in the flight with no increase in electrical load, my ammeter readings went from normal cruise 8-10 amps upto 30-40 amps for some minutes. My ammeter measures my B and C 40 amp Alternator ( about 2 years old) output to battery plus Buss . There is a B and C ext regulator installed. I have also installed a Monkworkz 30 Amp generator ( with reg) so that it is wired in parallel with the main Alt. The Monkworkz Gen is set to only provide power if the system voltage drops to 13.7 v. I monitor the Monkworkz current input into the Buss on the Skyview screen , so this is usually 0 amps , when the B and C does its job. As I have an Earthx 680 battery, I am used to seeing upto 40 amps of current at at start up only( the battery is ' hungry') , but not at cruise or climb.
I switched off my main alternator, but the Skyview amp reading still continued to read high 30-40 amps. I noted that after turning off the main alt, the Monkworkz amp out rose from zero to 9-10 Amps, as one would expect if the main alt was not providing power to the system. After a few minutes when I switched the main alt back online , my readings became 'normal'.
As the above abnormal readings are erroneous, I need advice about the cause and where to start looking.
thankyou in anticipation
Jeff R ( Australia)