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:
http://mail.lancaironline.net:81/lists/flyrotary/List.html>
>
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