| If you are really trying for convenience, how about a small electric pump plumbed to squirt oil into the tank filler neck? You could use a small R/C smoke oil pump and have a push button to operate it, placed somewhere inconspicuous close to the filler neck. Calibrate it by measuring the oil delivered per second so you would just hold the button down X seconds per gallon of fuel. You would have to find a place to store whatever quantity of oil you want to have on board, maybe a gallon?
Not sure how this would like 2 stroke oil, or how reliable it would be over time. Design the system so that if something goes amiss, you can pull out your gallon of oil and use a measuring cup if need be.
— James
Bill,
Great idea, kind of reminds me of fueling RC planes. While I was
writing the last post the picture of an oil can with flexible nozzle came to
mind.
I'm sure that our device already exists we just have to find it (and hope
it fits in our aircraft.)
The below link is to a device along the lines that I am talking. It is only
16 oz and is glass, however if they make it for salad oil there is probably
something available for us
Perhaps something as simple as pumps used to dispense epoxy (west marine)
or even some polyethylene 5 to 10 oz screw cap bottles that we can refill from a
bulk source. It is acceptable to overoil if necessary-- underoiling isn't too
good!!
Rich
Rich, The syringe is along
the kind of ideas I was thinking of. I was thinking of perhaps a pump
that put out a measured dose that you could insert into your oil container
with a hose on the outlet so that you could pump in however many squirts you
needed. You should be able to pump out of the gallon container you buy
the oil in. You could then cap the hose so that it didn’t leak. I
also like that 12 pack cooler that Bobby mentioned as well to help keep this
messy stuff organized. More
ideas?? Bill
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Thursday, May 21, 2015 9:57
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Method of adding
oil to fuel
Forgetting about the
small risk of failure of the OMP (which does happen), in the Renesis engines
manufactured until, I believe 2004, the ports squirting the oil into the
trochoids were insufficient (there were only 2 per rotor) and they had
multiple problems, so much so that Mazda, I am told, built a factory just to
rebuild the Renesis' at no cost to the owners. If you have a pre-2005 renesis
with 2 injection ports per rotor don't even consider the OMP. If you want to
consider the OMP, that is a decision with pros and cons on each side which I
will not go into. One way of mixing
the fuel and oil is to get a large cappable poly syringe or syringes . Fill it
(them) with 2 stroke oil and while adding fuel, inject the appropriate
amount as the fuel is flowing. They used to do this with a product called
Prist for Turbine engines. (although they used aerosol cans with a tube which
attached to the filler nozzle.) If you know that you
are going to put 10 gal in your tank, when you start fueling, squirt the stuff
in in the beginning when you start to add your fuel. Since the 2 stroke is or
supposed to be miscible with fuel, adding it this way especially with the
initial agitation of filling, despite the baffles, it should evenly
distribute. If you want, you can rock the wings. Remember, the baffles are not
continuous and have relief ports at the bottom of
each. One question that I
have about any of the 2 stroke oil bulk adding is is there a difference
between the brands on their misciblity?
I used to pre-mix
my oil & gas back when I was running auto gas (non-ethanol),
pumping into a fuel trailer at the nearby gas station. I would pour the
required amount of 2-stroke oil into the trailer tank, then add fuel.
By the time I was back at the airport it was well
mixed. After they started blending all mogas with ethanol, I was forced
to go to 100LL as my wing's adhesives are incompatible with alcohol.
My wings have a series of baffles, so adequate mixing became a
problem. So, I switched to the oil metering pump (OMP), using Richard
Sohn's OMP adapter and drawing from an auxiliary tank mounted on the
firewall. Now, I just have to remember to keep the oil tank
full. I often add a small amount of 2-stroke when filling the tanks,
but that is probably overkill. It is my belief
that the OMP puts the oil exactly where it needs to be, directly on the apex
seals rather than mixing in with the fuel only to be burned up and blown out
the exhaust, most of it never reaching the apex seals. (Probably a
topic for future discussion.) Anyway, I'm happy with the OMP
approach. It is a very simple pump and has proven effective in
millions of RX-7's and RX-8's. The one modification I made was to
fabricate steel oil lines to replace the plastic lines.
On Wed, May 20,
2015 at 10:15 PM, Bill Bradburry <flyrotary@lancaironline.net>
wrote:
I decided to add
oil to the fuel as I do the fill up back when I was building. That was
not a problem for a long time because I was buying fuel in a couple of 55
gal drums and hauling them on a trailer. I would add the oil to the
drum before I left the hangar to go to the gas station and then just fill
the drums. The first time that
I tried to do this at an airport, it turned out to be a PITA!
The wind was blowing and it was cold and the oil was stringing out all over
me and the wing. Quite a mess! This makes me start
to think of how can I measure and add this oil in a neat clean and easy
way. Now I know I am not the first guy to try and gas up on a windy
day so has anybody figured out how to do this in a cute
way? I discovered a long
time ago that the best inventions I can come up with come off this
list. How do you guys do this? Bill
|