Yep, I installed a Half Raven on my Rocket. Made a significant difference. I previously was using an Andair oil separator, but still got oil on the belly with minor zero or negative g excursions. Now the belly stays clean! Highly recommended!

Oil pressure
 

Thank you mark.

And what about your oil pressure ? Did you experimente low oil pressure when you are at zero or negative G ? Is it dangerous for the engine ?

I have not seen any significant low pressure, however I don't stay negative for more than a second or so. The biggest danger in my mind is the potential for the prop to lose oil pressure and the engine rpm to exceed limits, so must be careful!

No massiv oil pressure drop on negative
 

Hello

I will convert to a half Raven system soon ... because I lost to much oil out of the engine and onto the belly. Also the rear fuselage inside got covered :eek:

What I can say, during two wrong flown hammerheads and two flown correctly, I lost about 2 quarts of oil. Quite a bit shocked after landing and seeing the mess :(

Then I analysed the data about the oil pressure during this flight. I have from the engine monitor all second a measurement. The lowest oil pressure was 32 PSI , so I think it does not harmed the engine for the 1-3s where it was that low.

But to stay more save and unwilling to clean such a mess again, I will go with a half Raven system.

Dominik

What engine and RV model do you have?

I will be looking at a half Raven system, too. Great thread! As an aside, there is one other option to fuel injection for sustained inverted flight. My Ellison Throttle Body Is a simple, low pressure system that runs happily in any flight attitude. Now I just need to resolve the oil mess issue.

Brass vs aluminum fittings
 

Is there a reason to use brass fittings on the seperator rather than aluminum?

If you can find aluminum or steel fittings they work just fine. Large hose barbed fittings may be difficult to find except in brass.

Thanks
 

Thanks for the reply.

One thing to note.
 

Mostly available in any material, I used the least expensive. One thing - the top of the Raven tank connects to the top of the accessory case. If you are not planning on going full inverted, and attach to the typical breather port, then pay attention. The Raven top outlet is 1/2 NPT, the accessory case is 3/8" NPT (IO360 M1B). 3/8"NPT to hose is for 5/8" id hose. The 1/2"NPT is for 3/4" id hose. I could NOT find any fittings with a common hose ID, and used a bushing in the top of the tank to allow a 90 deg 3/8"NPT X 5/8" hose fitting.

If you want to go back to the accessory pad using the Raven or Christen adapter, then it is 1/2" NPT and you can use the 3/4" id hose. More $ unless you already have the pad adapter.

I sourced some fittings from Hoerr Racing. They have lower prices than Summit.
https://www.hrpworld.com/store/

I think I have some unused 90 deg fittings if you are interested, email me.

edit - total truth is i did find one straight brass fitting for $45 that is used for coolant on street rods. It is only in straight. It was 3/8"NPT X 3/4" hose id - I needed a 45 deg as 90 would not fit and straight was not suitable for hose routing on my 7. The fittings are made for the heater hose from the intake manifold.