Guess what the leftmost one does?
Carb heat – that’s what ours looks like.
I like to cover the span of all four with my hand during the take-off roll and pretend it’s a 747.
:-)
Four-lever operation is so cool!
First time I’ve seen a turbocharger lever! Is that a Comanche?
…and Peter’s picture is from a TB-10. Just had a nice training flight in at TB-10 GT last weekend.
NinerEchoPapa wrote:
First time I’ve seen a turbocharger lever! Is that a Comanche?
And there aren’t many possibilities to see this type of setup. There have been 26 factory built Turbo Comanches with this lever-type adjustment of the wastegate. It really feels like a second throttle in climb. I don’t know, though, how many aircraft still fly around with this type of configuration, including maybe other types (but not, for example, the Twin Comanches, which use a knob-like adjustment of the wastegate)
Peter, sorry I couldn’t resist to add my “four lever foto” here, and your initial question had been answered before…
I’ve seen Lake Amphibians with a turbo charger control. Uncommon, but there are some…
If the engine is a PT-6 turbine, that lever would be the stand by throttle, a fully manual control, in case the fuel control unit fails (which I have had happen). The standby throttle is more sensitive, and without some protections against exceedances, but will get you home. On Cessna Caravans, they are typically copper wire locked off, so pilots do not use in error, but I have used that control while doing engine set up in a Turbo Beaver, so got the hang of it then…
Very interesting – never seen it before.
What is the purpose of this lever?
Is there a limit for max continuous MAP that is lower than peak and therefore you can add some “extra power for climb”? Or is that more a method to save fuel?
How do you operate it in practice?
Malibuflyer wrote:
What is the purpose of this lever?
It releases the mighty mouse.
Malibuflyer wrote:
What is the purpose of this lever?
Is there a limit for max continuous MAP that is lower than peak and therefore you can add some “extra power for climb”? Or is that more a method to save fuel?
@Malibuflyer I assume you mean the Turbo Comanche setup I’ve shown above? It is a manually operated wastegate for a turbonormalized engine. I can only increase to standard pressure 1013.25 hPa or 29.8"Hg, not more. Else you blow the engine. It’s as simple like that. And because it is so simple to blow the engine, there are only very few around. If you know what you’re doing you can run the engine far more efficient, but if not, well, there is an overblow valve, but you’ve won a complete overhaul.
