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It's going into a Legacy RG with Aerochia's speed mods,
and other goodies. I anticipate approx. 400 hp at take-off. Take-off
roll might be a hair long, but once I get through 100-120 knots, watch
out......(:-) This is the first one (prop and aircraft configuration), and
that's the beauty of working with Craig, if I need to make changes, it's no big
deal. Try that with a CS prop......hee hee hee.
Greg Ward;
Lancair 20B in Progress
----- Original Message -----
Sent: Sunday, June 08, 2008 8:44 PM
Subject: [FlyRotary] Re: Muffler failed
designs.
Say What? That is an un-godly amount of pitch! What airframe
do you have Greg?
BTW I was just at Craigs house 2 weeks ago having some pitch taken out of
my previously 64x78" pitch prop.
I want to party with you dude! :-)
On Sun, Jun 8, 2008 at 6:32 PM, Greg Ward < gregw@onestopdesign.biz>
wrote:
Hey
Bill;
It's a 76" prop, 130" pitch. Target rpm 310 mph@2456 rpm.
Now you know why I need a turbo. Lead time varies.
Sent: Sunday,
June 08, 2008 3:07 PM
Subject: [FlyRotary] Re: Muffler failed
designs.
That is a LOT of pitch! What are the dimensions of
that prop? How long was
the lead time?
Bill
B
Sent: Sunday, June 08, 2008 5:09 PM
To: Rotary motors
in aircraft
Subject: [FlyRotary] Re: Muffler failed
designs.
Shortly Bill, just got my prop from Craig Cato today,
and want to hang it, then take a bunch of pics. Enclosed is a
little teaser from this morning. Greg ----- Original Message
----- From: "Bill Bradburry" < bbradburry@bellsouth.net> Sent: Sunday, June 08, 2008 7:36 AM
Subject:
[FlyRotary] Re: Muffler failed designs.
Greg,
Do you have any pictures anywhere of your
install?
Bill B
-----Original Message----- From: Rotary motors in
aircraft [mailto: flyrotary@lancaironline.net] On Behalf Of Greg
Ward Sent: Saturday, June 07, 2008 10:25 PM To: Rotary motors in
aircraft Subject: [FlyRotary] Re: Muffler failed designs. A
little off of the subject, but close. Just got my engine and
turbo mounted on the Lancair, and was wondering if anyone had ever
exited the 3" downpipe right out of the side of the cowling, ala
turbine exhaust types, (thrust???) it would eliminate 2 bends,
and about 3' of pipe, and with the turbo, it should be relatively
quiet. Any thoughts? Greg Ward; Lancair Legacy RG 20B
getting closer to startup....... ----- Original Message
----- From: < neilak@sympatico.ca> To: "Rotary motors in
aircraft" < flyrotary@lancaironline.net> Sent: Saturday,
June 07, 2008 4:08 PM Subject: [FlyRotary] Muffler failed
designs.
Al,
If
you go through the archives, you'll find lots of examples of
failed
muffler designs. Many by your's truly. I think I've tried
every
concoction known to man and the Swiss. They all
worked... for a while.
Actually, the many variations of
the Swiss muffler I tried had the
best exhaust note by far.
None lasted more than an hour, some less than
a
few
minutes. Heat wasn't so much the problem since I had found
many
materials good to 2200F but none could stand the
pounding.
http://www.piteraq.dk/flight/muffler.html
My
best overall design (see attached) is a 2" tube, full of
holes
inside a 5" tube. All made of 16ga SS, all welded
together. Needless to
say, the flange is more like 3/16" -
1/4" SS. The inside end of the 2"
tube
is welded to the
end cap of the 5" tube. That blocks off the one end
of
the
2" tube and secures it from movement. The exhaust
end of the 2" tube is
welded through a 2" hole in the other 5" end
cap. Rather than drilling
the
2" tube full of round holes,
we cut slots with a saw. Then take a big
flat
blade
screwdriver, stick it in the slot and bend it over. This
creates
an
oblong hole. (Much easier than drilling into
SS. This is what will go
on
the Volmer.
The sound
is quite acceptable, it fits inside the cowl and Jim M.'s
version
lasted the life of the aircraft... 600+ hours.
Neil
PS:
Are you considering Rough River?
-----Original
Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Al
Wick
Sent: Saturday, June 07, 2008 4:57 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re: Mistral Crash
Analysis
C'mon guys. You do this every time there's a crash.
Instantly go into
rationalization mode. It's unhealthy. Greatly
increases risk builders
won't
take action. Increases risk you
won't research it thoroughly.
A healthy response would be:"
Here's another example of how our engines
produce unusually
destructive exhaust temperature and pulses. We have
a
rich
history of broken exhaust components. We need to be
very thorough when
designing and building exhaust."
I
designed my own muffler. It had two inlets, two outlets. So if
(when)
my
muffler failed, it could never block both pipes. I
also put loose safety
wire around my pipes, because on a pusher
loosing pipe wipes out prop. So
basically, I assume stuff will
fail, then design it to control the way
it
fails. I've
heard of rotary guys doing same type of thing. This is a good
time
to share those key items.
On your car, they deliberately design
products to fail a certain way.
They
will make a component weak,
so it fails first. They do that with wheels
and
hubs. So when
the muffler fails, little pieces come apart, not
big
sections?
You guys do a great job of sharing successes,
design and construction
details. This is another
opportunity.
-al wick
<No doubt you are
on the money, Rusty. When folks are already
predisposed
to
bad mouth the rotary - this will only be more ammunition. "See!
even
with umpteen million dollars you can't get one to fly"
{:>). But, I
serious doubt it will effect many who
have researched the rotary and come
to
understand its
benefits - as for the rest, who cares {:>)
I'm
certain it was a relief to Mistral that the culprit was not one
of
their engine components.
Whew! a close one
for sure.
Hi
Ed,
Unfortunately, I bet the majority of people
will only hear "Mistral
rotary", "lost power", and "crash"
:-(
Rusty (RV-3 taking
forever.)
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