Inside a Planetary Reduction Drive

We reassemble an axial flow air turbine starter, looking closely at the planetary gear reduction section.
If you hated shop class, you'll have the same reaction to this video !

Category:

Autos & Vehicles

Tags:

• air
• turbine
• starter
• epicyclic
• planetary
• gearing
• lubrication
• grease
• torque
• spline
• sprag
• clutch
• bearing
• housing
• spur
• mesh
• teeth

[heligeorge]

I'm the guy from Cyprus.Yes Cyprus is the kind of place to settle down...but it's nice to see the world too.It definitely does not get near as cold here as it does where you are but AgentJZ...you are a global hero...I watch all your videos ...just as I used to watch aviation videos on the Wright Brothers back in the mid 70's.

[AgentJayZ]

@heligeorge Cyprus... When do I get to come for a visit?

[heligeorge]

Difference between a sprag clutch and a one one way bearing which we have on our rc Helis ?I run the one way bearings with absolutely no grease otherwise the one way bearings don't work...

[AgentJayZ]

@heligeorge Interesting. The Bell 206 we crawled all over in training used a sprag between the engine and main gearbox in order to allow instant transition to autorotation in the event of power loss.

[KEZJ01]

You have no idea how much i have learnt from your channel. You have such a great channel. Very very good job sir.

[JayJr2007]

Awesome video as usual.

[74HC138]

@heligeorge One-way bearings is a synonym for sprag clutch. The one way bearing in my T-Rex 600 is greased and works fine! (The kit actually ships with a tube of one-way bearing grease, and if you buy a spare, they often come with some grease already in them)

[theturbofantastic]

good explanation on the wire-locking! I have had workmates asking again and again about why you should twist the ending in the opposite direction and I told them exactly the same.

[karthik86c]

Dude you are the man!. Thanks for taking the time to share your experience. May god bless you.

[heligeorge]

Your call :-)

[heligeorge]

In all Rc Helicopters, there is a disengaging mechanism which let's the rotor spin free to autorotate.I would therefore assume with most certainty that real helicopters definitely have that too,so when the engine is brought to idle the rotor spins free.The more economic version is the one way bearing and the better choice is the sprag wheel...which comes in one unit and has a normal bearing in parallel.One way bearings jam if greased or use very thin oil.

[mikeallenbrown1]

@AgentJayZ oh ok, I see what you are saying now. Love the videos BTW. I'm a tech by trade but what I work on isn't nearly as complicated as turbines. Keep them coming! :)