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oil levels

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richard.goode(at)russiana
Guest

Posted: Fri Jul 04, 2014 5:00 am Post subject: oil levels

We have just had an interesting problem which I believe deserves a wider audience. It concerns a European Sukhoi, but since the oil system is basically the same as on 50/52/54/55 Yaks, it is totally relevant.

 

For Sukhois, the recommended oil level for aerobatics is 10 L, but our customer found that when filled to 10 L, he would always lose at least 2 L during an aerobatic session, bringing the level down to what he thought could be a worrying level. By chance, however, when filling his oil tank after changing the oil, he found that he had put in just over 12 L when the dipstick registered 10 L.

 

We then checked his dipstick with two other Sukhoi 29s, only to find that it had a different scale, and consistently registered 2 litres less than was in the tank, so the owner was always overfilling the tank!

 

I wonder how many other owners have ever checked how accurate their dipsticks might be!

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com

 

  [quote][b]

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ssssskippy

Joined: 02 May 2010
Posts: 58

Posted: Fri Jul 04, 2014 5:18 am Post subject: oil levels

you're right Richard!



I noticed that if I put more than 8,5 liters oil before aerobatics, Oil will spit everytimes out... could you tell us the lengh of the different dipsticks? From the top to the 10liters mark?

 



Thanks

Olivier



2014-07-04 14:58 GMT+02:00 Richard Goode <richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)>:

 [quote]

We have just had an interesting problem which I believe deserves a wider audience. It concerns a European Sukhoi, but since the oil system is basically the same as on 50/52/54/55 Yaks, it is totally relevant. 

Â 

For Sukhois, the recommended oil level for aerobatics is 10 L, but our customer found that when filled to 10 L, he would always lose at least 2 L during an aerobatic session, bringing the level down to what he thought could be a worrying level. By chance, however, when filling his oil tank after changing the oil, he found that he had put in just over 12 L when the dipstick registered 10 L. 

Â 

We then checked his dipstick with two other Sukhoi 29s, only to find that it had a different scale, and consistently registered 2 litres less than was in the tank, so the owner was always overfilling the tank! 

Â 

I wonder how many other owners have ever checked how accurate their dipsticks might be!

Â 

 Richard Goode Aerobatics

Rhodds Farm 

Lyonshall

Hereford 

HR5 3LW

Â  

Tel:Â  [url=tel:%2B44%20%280%29%201544%20340120]+44 (0) 1544 340120[/url] 

Fax: [url=tel:%2B44%20%280%29%201544%20340129]+44 (0) 1544 340129[/url] 

www.russianaeros.com

 Â 

   	  Quote: 	
		  



et="_blank">http://www.matronics.com/Navigator?Yak-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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pa3arw(at)ziggo.nl
Guest

Posted: Fri Jul 04, 2014 5:47 am Post subject: oil levels

Richard,

 

 Never checked it accurately but will do so soon. 

 What I have found though in the last 10 years is the following:

 I always fill up the oil tank of my Yak52 between 8 and 9 litres before an aerobatic sortie. When checking the level when back on the ground I have always lost about 1 tot 1,5 litres of oil. I remember from my conversion training in Lithuania that the advise was for an aerobatic sortie not to fill up the oil tank beyond 8 litres. The statement was: “She will throw out everything above 8 litres any way......”

 

 I’ll try to check the dip stick on how accurate it is...

 

 Hans Oortman

 PH-YAK

 

 

 

 Op 04-07-14 14:58, Richard Goode <[url=richard.goode(at)russianaeros.com]richard.goode(at)russianaeros.com[/url]> schreef:

 

 [quote]We have just had an interesting problem which I believe deserves a wider audience. It concerns a European Sukhoi, but since the oil system is basically the same as on 50/52/54/55 Yaks, it is totally relevant.

  

 For Sukhois, the recommended oil level for aerobatics is 10 L, but our customer found that when filled to 10 L, he would always lose at least 2 L during an aerobatic session, bringing the level down to what he thought could be a worrying level. By chance, however, when filling his oil tank after changing the oil, he found that he had put in just over 12 L when the dipstick registered 10 L.

  

 We then checked his dipstick with two other Sukhoi 29s, only to find that it had a different scale, and consistently registered 2 litres less than was in the tank, so the owner was always overfilling the tank!

  

 I wonder how many other owners have ever checked how accurate their dipsticks might be!

  

 Richard Goode Aerobatics

 Rhodds Farm

 Lyonshall

 Hereford

 HR5 3LW

  

 Tel:  +44 (0) 1544 340120

 Fax: +44 (0) 1544 340129

 www.russianaeros.com

  

 

 

 ail Forum -

 ">http://www.matronics.com/Navigator?Yak-List

 ;  - MATRONICS WEB FORUMS -

 matronics.com

 ;- List Contribution Web Site -

 ;                 -Matt Dralle, List Admin.

 ://www.matronics.com/contribution

 

 

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richard.goode(at)russiana
Guest

Posted: Fri Jul 04, 2014 8:25 am Post subject: oil levels

Hello Hans,

 

A 52 really should not throw oil out below 7 L, and ideally not below 8 L. However, the oil system is very good and will tend to pick up oil in most any attitude, even if it is somewhat low.

 

But it was interesting to find a dipstick reading a little more than 2 L out!

 

Regards

 

Richard

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com



 

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Hans Oortman

Sent: 04 July 2014 14:47

To: yak-list(at)matronics.com

Subject: Re: oil levels

 

Richard,



Never checked it accurately but will do so soon. 

What I have found though in the last 10 years is the following:

I always fill up the oil tank of my Yak52 between 8 and 9 litres before an aerobatic sortie. When checking the level when back on the ground I have always lost about 1 tot 1,5 litres of oil. I remember from my conversion training in Lithuania that the advise was for an aerobatic sortie not to fill up the oil tank beyond 8 litres. The statement was: “She will throw out everything above 8 litres any way......”



I’ll try to check the dip stick on how accurate it is...



Hans Oortman

PH-YAK



Op 04-07-14 14:58, Richard Goode <[url=richard.goode(at)russianaeros.com]richard.goode(at)russianaeros.com[/url]> schreef:

We have just had an interesting problem which I believe deserves a wider audience. It concerns a European Sukhoi, but since the oil system is basically the same as on 50/52/54/55 Yaks, it is totally relevant.

 

For Sukhois, the recommended oil level for aerobatics is 10 L, but our customer found that when filled to 10 L, he would always lose at least 2 L during an aerobatic session, bringing the level down to what he thought could be a worrying level. By chance, however, when filling his oil tank after changing the oil, he found that he had put in just over 12 L when the dipstick registered 10 L.

 

We then checked his dipstick with two other Sukhoi 29s, only to find that it had a different scale, and consistently registered 2 litres less than was in the tank, so the owner was always overfilling the tank!

 

I wonder how many other owners have ever checked how accurate their dipsticks might be!

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com







ail Forum -

">http://www.matronics.com/Navigator?Yak-List

;  - MATRONICS WEB FORUMS -

matronics.com

;- List Contribution Web Site -

;                 -Matt Dralle, List Admin.

://www.matronics.com/contribution



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GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Fri Jul 04, 2014 8:42 am Post subject: oil levels

        We have seen some owners fill the tanks to 12 liters (or More) and not realize that at that oil level, it can obscure the vent on the opposite side of the oil pick up in the tank. This crates pressure in the engine and it will use prodigious quantities of oil. They then usually think there is a problem and refill it to 12 liters and repeat the process. I personally never filled them above the 8 liter mark, even on a cross country flight of 4 house duration  (Yak52W or TW). I have seen this tendency in Lycoming's and Continentals. Because the oil dip stick has a 6 or 8 quart mark on it, many pilots feel it is necessary to fill it. I have had to put placards on my rental C150's not to fill above 4 quarts.   

George Coy

 

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Richard Goode

Sent: Friday, July 04, 2014 12:24 PM

To: yak-list(at)matronics.com

Subject: RE: oil levels

 

Hello Hans,

 

A 52 really should not throw oil out below 7 L, and ideally not below 8 L. However, the oil system is very good and will tend to pick up oil in most any attitude, even if it is somewhat low.

 

But it was interesting to find a dipstick reading a little more than 2 L out!

 

Regards

 

Richard

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com



 

From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Hans Oortman

Sent: 04 July 2014 14:47

To: yak-list(at)matronics.com (yak-list(at)matronics.com)

Subject: Re: oil levels

 

Richard,



Never checked it accurately but will do so soon. 

What I have found though in the last 10 years is the following:

I always fill up the oil tank of my Yak52 between 8 and 9 litres before an aerobatic sortie. When checking the level when back on the ground I have always lost about 1 tot 1,5 litres of oil. I remember from my conversion training in Lithuania that the advise was for an aerobatic sortie not to fill up the oil tank beyond 8 litres. The statement was: “She will throw out everything above 8 litres any way......”



I’ll try to check the dip stick on how accurate it is...



Hans Oortman

PH-YAK



Op 04-07-14 14:58, Richard Goode <[url=richard.goode(at)russianaeros.com]richard.goode(at)russianaeros.com[/url]> schreef:

We have just had an interesting problem which I believe deserves a wider audience. It concerns a European Sukhoi, but since the oil system is basically the same as on 50/52/54/55 Yaks, it is totally relevant.

 

For Sukhois, the recommended oil level for aerobatics is 10 L, but our customer found that when filled to 10 L, he would always lose at least 2 L during an aerobatic session, bringing the level down to what he thought could be a worrying level. By chance, however, when filling his oil tank after changing the oil, he found that he had put in just over 12 L when the dipstick registered 10 L.

 

We then checked his dipstick with two other Sukhoi 29s, only to find that it had a different scale, and consistently registered 2 litres less than was in the tank, so the owner was always overfilling the tank!

 

I wonder how many other owners have ever checked how accurate their dipsticks might be!

 

Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW

 

Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com







ail Forum -

">http://www.matronics.com/Navigator?Yak-List

;  - MATRONICS WEB FORUMS -

matronics.com

;- List Contribution Web Site -

;                 -Matt Dralle, List Admin.

://www.matronics.com/contribution 	  Quote: 	
		     http://www.matronics.com/Navigator?Yak-List http://forums.matronics.com http://www.matronics.com/contribution  	




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Steve Geard

Joined: 09 Dec 2013
Posts: 36

Posted: Tue Jul 08, 2014 2:43 am Post subject: Re: oil levels

Thats interesting. I've been wasting all that oil and having to clean my plane all this time.... Kinda thought having 10/11 in the tank was being safe!

I've never really taken  too much notice. But isn't the scale on the dipstick linear ?

In a round tank?

Steve Yak55m

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