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...)
>
> --
> Homepage:
http://www.flyrotary.com/>
Archive and UnSub:
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>
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