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  #21  
Old 06-05-2016, 06:32 AM
BillL BillL is online now
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
Default Anybody know about this stand pipe construction?

Quote:
Originally Posted by f14av8r View Post
Thanks to the excellent advice I got here, I chose and just finished installing a Raven Inverted Oil System - just the air/oil separator system. This is commonly referred to as the Half Raven since I didn't install the pressure side inverted oil valve components. My objective was to eliminate the excessive loss of oil and messy airplane I was seeing after my aerobatic flights. I have a carbureted 360 so sustained inverted isn't a requirement. I just wanted to eliminate the mess and the oil loss.


Randy


Well, I always wanted to do some aerobatics and figured I would not need inverted, but stopped to think about mistakes and the possible negative G , oil pressure, and prop speed control loss. Sooooo has Raven it is. I got the one quart accusump accumulator, and will order the Raven catch tank soon. One thing, the sump return on my IO360 with forward facing servo has no room for the picture above. The 90 deg will hit the intake tubes unless dropped down.

The sump returns seem pricey, so has anyone made their own? Is that stand pipe pressed in, epoxied, pinned, swaged, galled, or welded in place? Anybody Know?

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and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
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  #22  
Old 06-05-2016, 11:20 AM
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f14av8r f14av8r is offline
 
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Location: Tampa (Wimauma actually)
Posts: 421
Default Sump Return Fitting

Hi Bill,
If you buy the 1/2 Raven system, it comes with the sump fitting. I think you could probably make one on your own but it's not obvious to me how the pipe is attached to the fitting.
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Tampa (Wimauma), Florida
RV-4 N212CS (sold)
RV-8 N184RK (flying)
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  #23  
Old 06-05-2016, 12:40 PM
BillL BillL is online now
 
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Location: Central IL
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Default

I am going to call Monday, but was curious about the fitting - the tank is $295 and tank with sump fitting is $387. Seems a little expensive for $4 of tube in a $11 fitting. Maybe there is more in the kit. I will call.

Meanwhile, I have been calculating. The fitting is 7075T73 and if a 2024T6 tube is pressed in with a 3.2 thousands diametral interference, then it would have 9ksi surface pressure. I know - it would never be coming out. The tube might have to be internally sized to make it larger as only 5/8" nominal diameter is offered. A dry ice/alcohol and heat the fitting to 200F would yield .004" a drop in fit that yields the tube when temperature normalizes. Max pre stress. Probably not worth the trouble, though. Price quote will tell.
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RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #24  
Old 06-05-2016, 01:09 PM
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f14av8r f14av8r is offline
 
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Default Love the Math

Sounds to me like you have the skills and knowledge to roll your own Bill!
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Tampa (Wimauma), Florida
RV-4 N212CS (sold)
RV-8 N184RK (flying)
Flying an A320 to pay the bills
Exempt and gladly donating anyway - Current through March 2021
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  #25  
Old 06-05-2016, 02:03 PM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
Default Raven

I used the half Raven system on my 8 . I did not like the aluminum fitting supplied with the kit . I fabricated my own with a steel fitting and some 4130 tube . The system works well and might add the rest of the components for full inverted sometime soon .
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  #26  
Old 06-05-2016, 02:08 PM
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f14av8r f14av8r is offline
 
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Default More Info

G-Zero, would you be so kind as to provide us some more information on how you fabricated your fitting?
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Tampa (Wimauma), Florida
RV-4 N212CS (sold)
RV-8 N184RK (flying)
Flying an A320 to pay the bills
Exempt and gladly donating anyway - Current through March 2021
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  #27  
Old 06-05-2016, 02:59 PM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
Default Raven

If you look at the fitting supplied by Raven it has been bored out then an aluminum tube epoxied in place . What I did not like was after they bored the fitting it left only a minimal amount of metal in the valley of the threads .
I purchased a steel An8x1/2" 90 and found a tube in my scrap bin ( maybe 3/8" .035 wall 4130 ) . Sanded the tube to get a good press fit then put a few tig tacks for good measure . The diameter of the tube is not that critical as the tank gravity drains back to the sump thru it when you are upright , it's not part of the engine oil flow (pressure or suction )
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  #28  
Old 06-06-2016, 08:58 AM
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GalinHdz GalinHdz is offline
 
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Default

Quote:
Originally Posted by g zero View Post
I used the half Raven system on my 8 . I did not like the aluminum fitting supplied with the kit . I fabricated my own with a steel fitting and some 4130 tube . The system works well and might add the rest of the components for full inverted sometime soon .
Good to see you are back on line.
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  #29  
Old 07-27-2016, 10:50 AM
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Sylvainsting Sylvainsting is offline
 
Join Date: Nov 2014
Location: In the center of France
Posts: 90
Default Light system

Hello,

Did somebody use only the half Raven with success ?
I would like a light system without accumulator if possible..

Thank you
Sylvain
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  #30  
Old 07-27-2016, 11:47 AM
BillL BillL is online now
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
Default

Quote:
Originally Posted by g zero View Post
If you look at the fitting supplied by Raven it has been bored out then an aluminum tube epoxied in place . What I did not like was after they bored the fitting it left only a minimal amount of metal in the valley of the threads .
I purchased a steel An8x1/2" 90 and found a tube in my scrap bin ( maybe 3/8" .035 wall 4130 ) . Sanded the tube to get a good press fit then put a few tig tacks for good measure . The diameter of the tube is not that critical as the tank gravity drains back to the sump thru it when you are upright , it's not part of the engine oil flow (pressure or suction )
Thanks, I did this too. A 1/2" od steel tube, sanded a little, reamed part of the steel fitting then pressed in the tube on the hydraulic press. As I look at the sump, the tube can not come out if it is less than 1" clearance to the top of the sump. So, no TIG for this one. A lot easier to make than I thought.

I think the Raven part has a 5/8 OD tube. I decided not to do that as it is not being used for oil supply flow.

Regarding the half Raven only, Paul Dye (iron flight) is a long time user. It has much higher capacity for oil capture than a regular oil separator. One possible drawback is the large volume might cool off the air and condense moisture in cold weather. If using a dehydrator, then it should not be any risk there. Less than a regular engine that gets short flights with no dehydrator.
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Bill

RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Reply With Quote
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