Burping Question

[FlyingMonkey]

Going to preflight my CTSW for the first time Saturday before getting my final training hours in. I have not had to burp a 912 in some time. If I recall:

 

Turn prop ONLY in the direction of rotation (clockwise from the cockpit, counter clockwise looking at the prop from the front of the plane), NEVER in the opposite direction.

 

Correct?

[Jim Meade]

Correct. Roger can give you the long version, but you're right.

[FlyingMonkey]

I won't do that then.

[FlyingMonkey]

What about the soft start modules? Is that something more for comfort, or does it reduce wear/help the engine? I'm assuming a 2007 CTSW doesn't have one.

[Rich]

Andy,

 

You'll burp sooner if you turn the prop slowly and let the compression just slip past the rings to pressurize the case. This will get you to the burp sooner than rotating quickly.

 

I believe the soft start reduces starting torque and limits the stresses put on the engine, engine mounts and airframe. Not sure if the 2007 has it. You'd be able to tell when the engine is started by the reduced RPM, going to normal RPM within a second or so.

 

If you don't have it, I believe it can be installed.

 

Rich

[FlyingMonkey]

Thanks Rich! I know they can be installed, but the Rotax solution is pricey. There is the "Bullyhawk" version too, but I think I recall that while cheaper it doesn't do as much as the Rotax does to help the engine.

[Jim Meade]

I have another question on oil movement. At the time of the first sound of the gurgle, is all the oil back in the reservoir or does oil continue to move to the reservoir as you continue to turn several blades and hear more gurgles? If the latter, when do you quit pulling the engine through?

 

[Jim Meade]

Roger,

Well, mine seems to burp in 10 blades on some days and 30 on others. Nothing changed that I noticed, but I admit I have not been keeping detailed attention of every parameter.

 

It would seem to me that if I know how much oil I put in (3 qt) and it is in the right range on the stick, one blade or at most four should take care of hydrolock and I could go fly. I would not need to burp unless the oil was lower than I was willing to accept. I'm the only one who flies this plane.

[Ed Cesnalis]

I give it a burp once in a while to demonstrate how quirky my plastic airplane is when I'm trying to impress a real pilot.

[Jim Meade]

I've also been checking it before long or away flights or otherwise to feel comfortable but not for every 30 minutes locally. Thanks for the confirmation on that.

[207WF]

One good burp in the morning and I am set for the day! WF

[Doug G.]

Someone told me he seldom burps the oil because it was more likely you would forget to put the cap back on the tank than you would need to add oil. Although that seems to be the case I still normally do it as a part of preflight - for the time when something unexpected happens. I put the cap on the floor in front of my seat (on a rag or towel of course) so if I ever would forget, I would notice when I got in the plane.

[Duski Don]

G'day from Down Under,

 

Are there any issues with slightly overfilling the oil when it is changed and thus always seeing oil in the safety range on the dipstick without having to 'burp' it?

Is the 'hydraulicing' a real potential problem?

 

Regards to all,

Duski Don

[FlyingMonkey]

Hey Don...

 

I'm sure Roger will be along shortly with the definitive answer, but my understanding is that because the excess oil stays in the reservoir, you can't really "overfill" a 912 the way you can with an automotive engine.

 

 

The last time my CT burped, it smelled awful...I think it had Mexican for lunch.

[Jacques]

many answers here see the ''oïl system'' for burping http://www.conairsports.co.uk/912and914%20series%20technical%20info.html