feathering a prop

[jigsaw]

Originally posted by Bodhi
Thats an incorrect statement.  

My statement may not have been as detailed as you would like to nitpick about, but is far from incorrect.  If you don't agree, feel free to run out to your local prop twin, go full throttle, feather, and leave it there.

Trying to find the fine line where you can educate someone with little or no knowledge without having someone who thinks they know everything rip on you on this board is becoming tiresome.
Especially when the people who think they know it all are the most clueless.  

No, that last statement was not aimed at anyone specific, and no I don't claim to have all the answers myself.

[Golfer]

Originally posted by jigsaw

Trying to find the fine line where you can educate someone with little or no knowledge without having someone who thinks they know everything rip on you on this board is becoming tiresome.
Especially when the people who think they know it all are the most clueless.  
 

Well said, Jigsaw.  Can we make that sticky?

[Golfer]

On an equipped A/C, you better damn well ensure your prop feathers every time you start the SOB up, if you read your checklist, it especially mentions to ensure proper engagement of the feathering system so that if in flight you do have an engine failure, you know damn well it will work.

Also, I may have misred or that post may have been edited, but exercising the propeller prior to takeoff is NOT running it at feather for an indefinate period of time.  You don't go all the way to full feather...thats just tough on the engine and unnecessary.

I believe I read that the first time to understand that you started the engine with the propeller in feather.

If you have been doing this to an airplane, please let me have a tail number so I know never to fly that airplane.

[Straiga]

Golfer and Jigsaw, Theres nothing better than true flight experience, My hats off to you guys, Aviation need guys like you.


Straiga

[Bodhi]

Originally posted by jigsaw
My statement may not have been as detailed as you would like to nitpick about, but is far from incorrect.  If you don't agree, feel free to run out to your local prop twin, go full throttle, feather, and leave it there.

Jigsaw,

Sorry you took offence, but, the statement you made was incorrect.  You can run multitudes of twins in feather without hurting the engine, of course not at full throttle, thats common sense.  That was the point I was making.


As for going out to the local airport.  I will be there all day today, more than likely doing what I did before my parts trip last week, replacing the engine on our T-6, and building up a QEC for a certain bent wing bird.

[Bodhi]

Originally posted by Golfer
Also, I may have misred or that post may have been edited, but exercising the propeller prior to takeoff is NOT running it at feather for an indefinate period of time.  You don't go all the way to full feather...thats just tough on the engine and unnecessary.

Hey golfer, do not lecture me about running in feather.  The aircraft that I restore, maintain, and fly (specifically the twins) are when started generally in full feather, and when run up, ALL are cycled through to Full feather.  That is just the way of it, and if you are not cycling them through to full feather, then let me write down your pl # and maybe we can have a different talk in a different office.  If you have an A+P / IA, you best damn well know better.

[jigsaw]

Bodhi, no worries and no offense taken. My original statement on the "feather" thing was meant to be very vague an non-specific so it would be easy for someone lacking your knowledge to grasp the concept.

The majority of things I post answers to here are made from the standpoint of making it easy for the student to get the big picture, then get technical when they have the basics down.

Originally posted by Bodhi
...not at full throttle, thats common sense.  That was the point I was making.

We definitely agree on that point.

Grats on your A&P and IA. I may go after those one day. Those or a DE spot when I hit the wall for airlines.

Take care of that bent winger.

[Straiga]

Hey Bodhi,

What kind of twins we talking about?  If there turbo-props thats normal procedure. Im trying to think of the last piston twin that I have started in feather.

Straiga

[jigsaw]

Originally posted by Straiga
Golfer and Jigsaw, Theres nothing better than true flight experience, My hats off to you guys, Aviation need guys like you.


Straiga

Thank you sir. I hope to get in as nice a cockpit as you have one day.

[Bodhi]

Jigsaw a big to you too this morning... sorry for the snappy response on the whole thing to begin with.  Must have woke up on the wrong side of the bed, but that's not an excuse to take it out on others.

[Bodhi]

Originally posted by Straiga
Hey Bodhi,

What kind of twins we talking about?  If there turbo-props thats normal procedure. Im trying to think of the last piston twin that I have started in feather.

Straiga

straiga,

Goop point and, you caught me making a "blanket statement" the only ones in feather are the turbos as you correctly stated, the "others" are just run through to feather and back before shut down to flush the domes, especially if there is a sit period ahead.

Removing foot now.  

to you too.

[hitech]

Straiga: Are turbo props started in full feather to prevent runaway?

HiTech

[Golfer]

Originally posted by Bodhi
straiga,

Goop point and, you caught me making a "blanket statement" the only ones in feather are the turbos as you correctly stated, the "others" are just run through to feather and back before shut down to flush the domes, especially if there is a sit period ahead.

Removing foot now.  

to you too.

Bodhi...did you skip over this whole post?

I figured we were fairly universal about piston engines and their propellers.

Though, intrigued...I'd like to hear a piston airplane that uses such a procedure as starting the engine in feather.

Forgot to mention that I could name more than a few turboprops that start in feather, but thats a whole different ball of wax in a different can of worms. We're talking about piston engines and again, I'd like to hear of one because that's new to me.

[Bodhi]

Originally posted by Golfer
Bodhi...did you skip over this whole post?

apparently I did... my bad.

[Straiga]

Straiga: Are turbo props started in full feather to prevent runaway?

No, all turbo props go to feather after shutdown. You either put it in feather or it does it by itself. A normal shut would be throttles idle, prop full forward, condition levers idle cutoff. After the engines shutdown, pull the props into feather and then return prop levers forward. This dumps all the pressure in the dome and spools the engine down quickly because no oil is being pumped onto the bearing surfaces.

 You can also just leave the prop levers alone after shutdown and after the props stop turning you can see the props go to feather after pressure is gone from the dome.

By cycling props into feather and doing feather test this purges the system and this also to makes shure things like auto feather and prop govener tests work properly.

Straiga