Windmilling Turbines
Jamair has a point.
I used to see the left prop secured while loading passengers through D1L.
I used to see the left prop secured while loading passengers through D1L.
Oh is it pantomime season?
All together now at the back...
"Oh yes he does"
All together now at the back...
"Oh yes he does"
I remember hearing years ago about some speed record car driver, might have been Ken Warby?, who bought an Avon engine from Pearce and stuck it on a truck to bring it back east. Apparently it windmilled all the way across the country and by the time it got to its destination it was rooted, to use a technical term.
In my book N1 (Ng) is gas generator speed, N2 (Np) is free turbine speed (what's connected to the output shaft), for what it's worth.
In my book N1 (Ng) is gas generator speed, N2 (Np) is free turbine speed (what's connected to the output shaft), for what it's worth.
Join Date: Apr 2007
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It's the airframe manufacture that calls the shots to either n1 or NG or n2 or n2 np etc. that is until you get into the P&W mm then they call n1 etc. the prop gear box in a pt6 has both plain and and roller bearings. The plain bearing has its oil supply from the prop gov all the other bearings are supplied by the oil
Pumps. The oil pumps are in the cold section. And as such the prop is free to spin and will not have any oil supplied to any bearings when the cold section is not spinning. But still at the end of the day it's just good practice to strap any turbine and cover any fan to stop the spinning.
Pumps. The oil pumps are in the cold section. And as such the prop is free to spin and will not have any oil supplied to any bearings when the cold section is not spinning. But still at the end of the day it's just good practice to strap any turbine and cover any fan to stop the spinning.
