Engine Start-Up Bell 206 JetRanger from outside

Hochfahren der legendären Allison 250-C20 Wellenturbine (420 PS) in einem Bell 206 JetRangerIII.

Category:

Autos & Vehicles

Tags:

• ahlen-nord
• heliport
• agrarflug
• helilift
• hubschrauber
• helicopter
• bell
• 206
• engine
• start
• turbine
• start-up
• allison
• 250-c20

[nandiito]

Could anyone who really knows explain to me how the propellers move?

All I wonder is if it has a kind of transmission, well not transmission because it's direct with no shifting, but what connects the engine to the propeller. I guess it's more like a clutch or a belt as in CVT transmissions. What allows the engine to run and slowly connect to the propeller?

[youtuubesucks]

@nandiito

That means that approx. 6500 rpm N2 "go inside" the XMSN and i think 364 rpm "come out" to the main rotor. As the power turbine (N2) spools up after ignition the rotor starts turning slowly. Due to the speed ratio of the transmission it seems that there is some kind of clutch involved but there isn't! However, there are some helicopters (piston and turbine) which have a clutch, e.g. R22, R44, Hughes 300, SA3?? Lama etc. I hope it's now clear to you?!

[Zoloft61]

tick tick tick tick tick woeiiiiiiiiiiiiiiiiiiii booooooo

I like it!

[ramano11]

As groundcrew, I love the sound and smell of turbine exhaust in the morning!

[ilovegoatsecks]

@zcg3 i like the smell of goats in the morning

[zcg3]

@ramano11 You're weird! I like the smell of Napalm in the morning...

[annmall100]

@IWMYB

When did I say it was gasoline???

After 7 years on this type I ought to know better :)

[IWMYB]

@annmall100 it's kerosine not gasoline :-)

[bigman3255]

@youtuubesucks there is no clutch in the helicopter....what engages the turbine engine to the transmission is a freewheeling unit....this allows the engine to drive the trani but not the trani to drive the engine....this is critical because if your engine quits then your rotor would seize and u wouldnt be able to autorotate

[nandiito]

@annmall100 @youtuubesucks Thanks for the information :)

[annmall100]

@ramano11 Smells like........... Victory :)

[annmall100]

@nandiito The engine is directly connected to the Main Rotor Gearbox which is also connected to the Tail Rotor system. When the Engine is burning and turning, so are the rotors. The engine winds up slowly (as you can hear), as it accelerates the Rotors turn faster until it is up to Flight Idle. In the event of a power failure the Rotors can be disengaged from the powerplant via what's known as a Free Wheel Unit.

[shairaptor]

@22640cal haha :)

[22640cal]

@shairaptor helicopters are sexy by default.... except Russian ones lol :)