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I sure hate to hear all this talk of solving problems by building
heavier. Weight is the absolute enemy in an airplane.
All my RV-4 exhaust systems were all made from 035" 321
SS (except for the aftermarket mufflers) and lasted for well over 800
hours. The home made .035 under cowl muffler worked well (800+
hrs) until I went to the turbo port rotor housings but the best answer to
that problem would not have been to triple it's weight. Attention to
thermal and mechanical stress and awareness of the shock wave on the turbo rotor
housings is the answer, not brute strength.
BTW, welcome home Dave L ! Hope you get to spend some time on that RV
after catching up on the inevitable 'back home' chores.
Tracy
----- Original Message -----
Sent: Wednesday, September 06, 2006 10:27
PM
Subject: [FlyRotary] Re: Departed
Exhaust
Joe, why are you rebuilding your engine mount? The pipes that
cracked
up were 0.049" thick and welded solid. Next ones I will make
from 2"
and 0.065 material with slip joints. Cast manifold from NA
engine and
than single pipe crossed my mind too, but the sucker is
very heavy.
Again, you have engine mount like mine. Why are you
modifying it?
Bulent "Buly" Aliev
FXE Ft lauderdale, FL
http://tinyurl.com/s5xw8
On Sep
6, 2006, at 9:48 PM, Joe Berki wrote:
> Buly,
> I am glad that
you are safe. What dimensions on the exhaust pipes
> need
to
> be changed? I am wondering ir the cast iron exhaust might
solve
> some of
> thes issues. Unfortuntly I will
need to modify or build a nes
> engne mount.
>
> Joe
Berki
> Limo EZ
> Canard in primer
>
> ----- Original
Message -----
> From: "Ed Anderson" <eanderson@carolina.rr.com>
>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>
Sent: Wednesday, September 06, 2006 7:57 AM
> Subject: [FlyRotary]
Departed Exhaust
>
>
>> Hi Buly, great to hear about your
flight and happy to hear the
>> missing
>> exhaust
component did not cause damage - however, I would inspect
>>
the prop
>> blade very closely to make certain no small cracks in
blade -
>> particularly
>> near the
hub.
>>
>> Yes, I have pulverized sufficient metal by
trying different exhaust
>> internals to say that the shock of the
exhaust pulse particular
>> with a
> turbo
>>
block is tremendous. I have destroyed 1/8" thick stainless steel
>> in a
>> matter of hours. It appears that if a
exhaust component is
>> perpendicular
> to
>>
the front of the shock wave, the impact on the component is such
>> to reduce
>> its life to almost nil. If the
component is at an angle then its
>> life is
>> much
longer. The constant flexing of the metal at 200 times/sec
>> at 6000
> rpm
>> caused by the strong exhaust
pulse fatigues the metal extremely
>>
rapidly.
>>
>> The joke around my airport is "You can
hear Ed long before you
>> can see
>> him!" -
my response is that its a safety feature to let others
>> know
I am
> on
>> my way inbound{:>).
>>
>>
Ed
>> Ed Anderson
>> Rv-6A N494BW Rotary Powered
>>
Matthews, NC
>> eanderson@carolina.rr.com
>>
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
>>
----- Original Message -----
>> From: "Bulent Aliev" <atlasyts@bellsouth.net>
>>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>>
Sent: Wednesday, September 06, 2006 7:17 AM
>> Subject: [FlyRotary]
Re: OT: Gardenhose as level
>>
>>
>>> Joe, it
was a "shake down" alright with an exhaust problem like
>>>
yours.
>>> on Sat we did some takeoffs and landings with the CFI
Ron
>>> Miller. With
>>> gross weight of
1850 pounds, on takeoff I'm getting 6500-7000
>>> rpm
and
>>> climb rate of about 1000 fpm. Than we went to 1500 ft
over the
>>> airport
>>> and i did some
steep turns etc for about 40 min. It flies like a
>>>
dream
>>> (compared to C-172 :). Transponder did not work
again.
>>> Next day we got a waiver for the transponder and headed
to an old
>>> uncontrolled military field with two huge 5000 ft
runways, so i can
>>> practice landings and takeoffs. So we took
off and headed for our
>>> destination at 3500 ft over alligator
country. Pulled back the
>>> power to
>>>
5000 rpm and we were cruising at 140 knots. Nothing spectacular,
>>> but i
>>> kept the prop at low pitch to go easy
on the engine. 15 min
>>> later,
we
>>> heard a bang and the plane felt like we run over a
rock. First
>>> reaction
>>> look for a
place to land. But soon everything checked out and the
>
engine
>>> kept running normal with temps at 185-187F
degrees with OAT at 85F.
>>> Landed OK at our destination
and taxied to the FBO. Ron got out
>>> first
>
and
>>> started looking, but can not find anything wrong? I
got out and
>>> noticed
> a
>>> slight
scuff like a drag mark 3" wide on one of the Ivo blades
>>> starting
>>> about where the exhaust would
be and going to the tip. The las oval
> piece
>>> of
my shiny new exhaust was missing. Mystery solved. Ivo is a
>>> one tough
>>> prop to survive a 3" long 3"
diam. SS pipe going hitting the
>>> blade.
We
>>> continued with the training and I was getting good at
it but
>>> with lots
> of
>>> full
power takeoffs and not enough time for the engine to cool
>>> down,
> some
>>> of the coolant
boiled out on takeoff and we came down to replace
>>> to
add
>>> more coolant and check under the hood. Added some
water, cleaned
>>> the
>>> plugs, just in case
and took off again.
>>> By now it was a sweltering heat with
jungle like humidity and
>>> after
few
>>> landings, we headed home. The trip was uneventful, the
engine was
> running
>>> fine around 5000 rpm. The biggest
surprise later was after I
>>> removed
>
the
>>> SS heat shields from around my new exhaust pipes.
one pipe was
>>> totaly
>>> separated at
the weld, another was half cracked.
>>> Sound familiar Joe:) The
exhaust pulses must be ferocious? people on
> the
>>> ground
said they can hear me long before they can see me coming:)
>>>
More later. Got to go to work.
>>> Bulent "Buly"
Aliev
>>> FXE Ft lauderdale, FL
>>> http://tinyurl.com/s5xw8
>>>
>>>
On Sep 5, 2006, at 11:47 PM, Joe Hull
wrote:
>>>
>>>> OK - it's supposed to be "Shake
down cruise" - don't tell me
>>>> you
broke
>>>> down
>>>>
somewhere!!
>>>>
>>>> But congrats on flying it
anyway!!
>>>>
>>>> Joe Hull
>>>>
Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA)
>>>> Redmond
(Seattle),
Washington
>>>>
>>>>
>>>>>
-----Original Message-----
>>>>> From: Rotary motors in
aircraft
>>>>>
[mailto:flyrotary@lancaironline.net]
> On
>>>>> Behalf
Of Bulent Aliev
>>>>> Sent: Tuesday, September 05, 2006 8:20
PM
>>>>> To: Rotary motors in
aircraft
>>>>> Subject: [FlyRotary] Re: OT: Gardenhose as
level
>>>>>
>>>>>
>>>>>>
>>>>>>
Guess I need to buy some expensive clear hose
.....
>>>>>>
Finn
>>>>>
>>>>> Finn, if you buy the
right size, one day you can used for your
>>>>>
fuel
>>>>> lines on the next airplane. Worked very well on
the first one :)
>>>>> Buly
>>>>> Finally
checked out in my plane.
>>>>> Did my first 100 mile "cross
country". Or should I say "break down
>>>>> cruise"
:),
>>>>>
>>>>> --
>>>>>
Homepage: http://www.flyrotary.com/
>>>>>
Archive and UnSub: http://mail.lancaironline.net/lists/
>>>>>
flyrotary/
>>>>
>>>>
>>>>
--
>>>> Homepage: http://www.flyrotary.com/
>>>>
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>>>
>>>
>>>
--
>>> Homepage: http://www.flyrotary.com/
>>>
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>>
>>
>>
>>
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>>
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>>
>>
>>
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>>
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>
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