The trick is different adapters from the oval shaped or

double

circle ports to round tubes. Fortunately help is on the way.
Rhino has a command called "unroll developed surfaces" that
generates a pattern that is then cut out of soft .063 6061-O and

rolled up and welded along the seam. That gives you an adapter that
can then be shaped into what you need without any

stretching of metal.

Paul Lamar

Paul -

I have long thought that simple intake adapters for the various

rotary engines were the way to go.  The adapters would have a

flange at each end - one bolts to the engine and another bolts to
the round intake pipe flange.

My concern was the number of variations required:
        1) Multiple rotary engines
        2) Multiple intake pipe diameters
        3) Multiple intake configurations
                a) Separate pri & sec runners
                b) Combined pri & sec runners
        4) Multiple porting variations
        5) Multiple angle adaptations
                a) straight through
                b) built in 90 degree turn

Once these adapters became available, we could simply weld

flanges

to the intake runners and bolt everything together.  It should make

for a very light induction system.

I think this is worth pursuing.  I'd be more interested in

these

adapters than your previous manifold casting.  (Good job, by the

way.)

I'd vote for a straight through combined pri & sec into a

single

runner of the same intake area (2"?).  This would be the simplest

for the builder.

Ideas?

--
Thanks,
-Vince Orton

I have a pattern already for the second gen four port. Maybe I

will

get a bunch cast up.

Paul Lamar

It is right in here where most people run into fabrications

problems. You can't just squash the pipe flat. The area becomes
less than the round part of the pipe.

Yes the intake manifold flange is not shown.

Paul Lamar

I was kind of curious what a straight manifold would look like. Not

likely to fit in the average Long EZ. Might fit in the wing of a
twin with partially buried engines. The firewall is only 24 inches
in diameter. No cooling rads or muffler.

Paul Lamar

Matt Prather wrote:

Long EZ's (and Varieze's ) have quite a bit of room between the
valve cover on an O-2xx and the wing root.  On my Varieze it's
probably about 12" - maybe more.  Further, there isn't really
anything structural in that part of the wing (that couldn't
be worked around).  The only big issue is that the wings are
styrofoam, which is dissolved by fuel.  If the injector rail
were mounted out in the wing, and it ever leaked (count on it),
you would likely have to repair the trailing edge of the wing.
Not an insurmountable problem.  If you designed in a closeout
with a drain, you could minimize the damage.  Is there really
any benefit to the straight runners?

It's 64" from wing root to wing root.  I would guess that we
could fit the runners in there.

A link to a 3 view Varieze drawing:

http://www.webpak.net/%7Emprather/Airplanes/3-side.jpg

Regards,

Matt-

Its well over 20 inches out from the block with plenum and fuel
rail. 26 inches out from centerline. It might fit if we put a couple of
jogs in it. I really don't think straight is all that important.
I think if it came straight out it would be above the wing anyway. Do
you have a more detailed drawing showing the thrust line relatives to
the top of the spar?

Here is a 3D of a Long EZ. Looks like it will come straight out over the
wing.

Paul Lamar

Matt Prather wrote:

Wow!!  The LongEZ rendering is fantastic!!

I am considering building a rotary powered Eracer - side
by side, retractable LongEZ.  Seeing this drawing makes
it seem much more possible.

The cooling air inlet looks to be constant cross section
until it gets to the radiator.  The bottom of the fuse can
be raised (like those with a NACA inlet), which maybe would
allow for less pressure loss.  Any thoughts?

One nice thing about the Eracer - the fire-wall is wider -
maybe about 30".  Might allow a radiator with more cross
section.

A pic of the fuse tub without the firewall/wing spar:

http://www.eracer.org/images/eracer330/eracer330-020.jpg

Upside down fuse with the structural stuff mounted:

http://www.eracer.org/images/eracer330/eracer330-071.jpg

Inside of the fuse with the relief for the inlet of the
NACA:

http://www.eracer.org/images/eracer330/eracer330-022.jpg

Index page:

http://www.eracer.org/builder_pages/eracer330/eracer330.html

Probably all kind of like a Cozy too.

Regards,

Matt--- 

I think a ramp type inlet with a scoop part might work. Best to not
risk boundary layer problems and go with a P51 type scoop.
We know they work.

Paul Lamar
 
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