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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