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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http://www.flyrotary.com/
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