PT6 'exploding' midair
Gnome de PPRuNe
Join Date: Jan 2002
Location: Too close to Croydon for comfort
Age: 60
Posts: 12,635
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Main thing is that Mike's down, safe and, knowing him, back to work!
Isn't there at least one UK Lancair with a turbine? Probably not a PT6 though... Edit: if there is, I can't find it! Sure I saw a UK homebuilt with a turbine somewhere... (and not Rich Goodwin's new Pitts!)
Isn't there at least one UK Lancair with a turbine? Probably not a PT6 though... Edit: if there is, I can't find it! Sure I saw a UK homebuilt with a turbine somewhere... (and not Rich Goodwin's new Pitts!)
Evolution Aircraft also market various PT6 options on their pressurised Lancair - Wikipedia reckons 70+ in service, but I suspect that number includes the Lycoming-powered variants as well.
There used to be a turbine Chipmunk too - saw it at Farnborough about 55 years ago. A Rover turbine?
Gnome de PPRuNe
Join Date: Jan 2002
Location: Too close to Croydon for comfort
Age: 60
Posts: 12,635
Received 300 Likes
on
168 Posts
What bothered me about Mike's review of the Garmin G3X Touch data log was that he seemed to believe it could provide an indication of how quickly the gas generator and prop stopped rotating.
I have an experimental aircraft with a Garmin G3X Touch system and I have reviewed recorded data many times. I found that the data is so heavily lagged that it is useless for analysing "fast" events. The time constant seems to be between 3 and 5 seconds.
As an example - I added a Hall effect current transducer to my pitot heater. Anyone who is familair with resistive heater elements knows that the inrush current has a large surge that quickly reduces as the heater warms up. G3X data log, and displayed heater current, both show a slow increase to the steady state hot current value. The inrush surge is completely hidden.
I have wished many times that Garmin would make the unfiltered data available in the log, perhaps as a user option. If I want to filter the data it's easy enough to do that as part of the post flight data analysis.
I have an experimental aircraft with a Garmin G3X Touch system and I have reviewed recorded data many times. I found that the data is so heavily lagged that it is useless for analysing "fast" events. The time constant seems to be between 3 and 5 seconds.
As an example - I added a Hall effect current transducer to my pitot heater. Anyone who is familair with resistive heater elements knows that the inrush current has a large surge that quickly reduces as the heater warms up. G3X data log, and displayed heater current, both show a slow increase to the steady state hot current value. The inrush surge is completely hidden.
I have wished many times that Garmin would make the unfiltered data available in the log, perhaps as a user option. If I want to filter the data it's easy enough to do that as part of the post flight data analysis.
Last edited by EXDAC; 24th Jul 2023 at 20:25.
