Looks good, Charlie
No welder myself, however when it came time
to attach 0.049 wall aluminum tubing to the cast aluminum stock
manifold (see photo attached), I found a brazing rod for aluminum that
worked great.
Used a butane torch (more BTU/min the better) to
first heat the casting (your plate would be easier) and then brought the
flame close to the tubing - but not playing on the tubing. touched the
brazing rod to the intersection and it did a great job. Been flying
for 8 years with that throttle body (blue half moon) stuck out on the end
without any additional support and still OK.
Here is the website for
the rod I used successfully - before trying this rod, I probably had 10 lbs
or various rods that I never had any luck with, but this
worked.
http://www.aluminumrepair.com/Ed
--------------------------------------------------
From:
"Charlie England" <
ceengland7@gmail.com>
Sent:
Sunday, February 17, 2013 3:41 PM
To: "Rotary motors in aircraft" <
flyrotary@lancaironline.net>
Subject:
[FlyRotary] Intake progress
>
> Now that everyone's awake
again, I thought I'd send a pic of my intake
> progress (RV-7 Renesis
with James Lyc cowl). I played with a couple of
> different materials
for the bell mouths. I tried gluing up some 1/4"
> plexi from an old
windshield, but used super glue instead of proper
> plexi cement
(which I wasn't able to find locally in a hurry). The 1st
> try
popped apart on the lathe; the 2nd turned out ok. Next effort was
>
with 3/4" MDF (medium density fiberboard). That went well, until I put a
> little too much side pressure on the ring (homemade cutting tool)
after
> undercutting the center section. Overall tube lengths will be
~11 3/4"
> block surface to bell ends. The plenum is *much* bigger
than most tuning
> sites recommend. I figure that I can experiment
with plenum size by just
> stuffing it with rigid foam to take up
some volume, if needed. Going the
> other way wouldn't be so easy.
:-)
>
> Since I don't have Mark's TIG skills, I thought I'd ask
what others have
> used in joining thin wall tubing to 1/4" aluminum
plate. Aluminum
> brazing rod? High temp epoxy? JB weld? I do intend
to add bracing from
> the plate to the plenum assembly to take some
of the cantilever &
> vibration stress off the tubes.
>
> I'm using this length and concept because Tracy has had great luck
with
> both HP & BSFC on his Renesis with a similar
configuration. However, I'm
> curious about how others have adapted
the common Helmholtz intake tuning
> formulas to the rotary. Would
anyone care to 'show their (math) work'?
> Renesis users would be
better for me, but any calcs would do. When I
> tried to adapt the
common formulas to a rotary, I was getting
> 'interesting' results,
so I'd like to know if I got lost somewhere while
> trying to plug
rotary 'valve' timing into the formulas.
>
> Charlie
>
(Sorry for the sideways iphone pic; I guess you can pretend that you're
> looking down on it...)
>
> --
>
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