Mailing List flyrotary@lancaironline.net Message #63720
From: Todd Bartrim <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Heat Soak & Fuel Purge valve- Another half baked idea?
Date: Thu, 31 Aug 2017 13:53:21 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Hi Dave;
 Happy to see you back on the list as well. I think the last we heard from you was when you were looking to buy a TIG welder. How did that work out for you? Hearing about you guys flying up to be in the eclipse path is a great story for those who are currently ground bound. I'm looking forward to getting back up there.
   Thanks for the fuel diagram. It's a what I would probably have done if I hadn't gone with all these tanks, and should probably still do it.
I'll answer in detail in another post with a fuel diagram.

I hope everybody managed to get through the storm OK?

Todd


Todd Bartrim

On Tue, Aug 29, 2017 at 2:04 PM, David Leonard <flyrotary@lancaironline.net> wrote:
I agree with Matt.  The high pressure high flow system is one of the strengths of going with an alternate engine.  Besides eliminating any possibility of vapor lock, it also provides protection against such malaties as water contamination and un-mixed 2-stroke oil.

The pluming is not particularly difficult, especially when compared to some of the options you are considering here.  I just have a single return line that returns to the left tank, eliminating the need for a 2 control valves.  That means that when I am on the right tank I am transferring fuel to the left which leaves open the possibility of overflow out the vent, but I always set a timer and it has not been a problem for me.

When fueling away from home, it is difficult to get the 2-stroke oil to mix well, even with rocking the plane.  The high flow system mixes it quickly in the the left tank, but when I switch to the right I often get several seconds of rough running now matter how much I try to shake and shimmy first.  If it were not for the high flow system, those several seconds of rough running would turn into nearly a full minute.  That would be NO fun!!!

Glad to see you back at it Todd!

Trip report: I just flew my RV-6 up to Idaho for the eclipse.  We stayed at a place with a private dirt strip in the Sawtooth Mountains at 5200'.  Epic experience.  Very hot sometimes and I was glad to have a return flow system.

Dave Leonard
Turbo Rotary RV-6
coming up on 1000 hrs soon..... 

On Wed, Aug 23, 2017 at 5:23 AM, Matt Boiteau <flyrotary@lancaironline.net> wrote:
What was your reason to go return-less?

I have 4 tanks in the wings split between the middle spar. Front left & right, Back left & right. Instead of having a selector valve for each tank (plus their return lines), I made 1 tank the main header tank. Fuel supplies and returns to it. And the rest of the tanks feed the main tank using transfer pump. No selector valve, full return system.

-Matt Boiteau

On Aug 22, 2017 17:36, "Todd Bartrim" <flyrotary@lancaironline.net> wrote:
By opening manually, I meant just opening the oil hatch on the top of the RV cowl to let it cool. With that up in the air it would be difficult to miss and if I did miss it during a pre-flight, then I'd probably not be doing a good job of my pre-flight inspection.
But I do think it's a good idea and one that I may have given more serious consideration to if I'd known about it earlier this year when I was doing fiberglass work on the cowl.
At this point though it looks pretty easy for me to add the fuel purge to the injector header, so unless somebody talks me back from the ledge, I'm probably going to jump. Just as soon as I finish a solar mod on my boat so I can take my kid fishing tomorrow.

Todd

Todd Bartrim

On Tue, Aug 22, 2017 at 12:28 PM, Thomas Mann <flyrotary@lancaironline.net> wrote:
>Cheaper, lighter and probably safer to just open the door manually.
__________________________________________________________________________
Cheaper: Depending on the alternative? Probably
Lighter: Again, depending on the alternative????
Safer: Doubtful. These things are pretty much foolproof and have been used in aircraft already for just this purpose.
       With a front hinged vent door I cannot see a benefit to using a manual mechanical method of operation.
       If you do use a mechanical actuator ..... don't forget to come back and close it.
 
All in all, it's sounds as those this would not be a good solution for you.
 



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