Today's Message Index:
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1. 12:50 PM - slow day on the list (robert bean)
2. 12:56 PM - Re: 3 bladed Warp Drive propeller, RK-400 release question ? (Dennis Thate)
3. 01:21 PM - Re: slow day on the list (Larry Cottrell)
4. 06:58 PM - Muffler crack (Richard Pike)
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Subject: | slow day on the list |
Here is the original incarnation of N3851E that I flew for 25 years.
forgive the editing, trying to chop it down to youtube's 15 minutes
ain't easy.
http://www.youtube.com/watch?v=M39q-pbdn-o
BB
Kolb MkIII, N3851E
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Subject: | Re: 3 bladed Warp Drive propeller, RK-400 release question |
?
Thanks for all the private responses . You've answered my concerns.
--------
Both optimists and pessimists contribute to our society. The optimist invents
the airplane and the pessimist the parachute. ~Gil Stern
Faith is believing what you know ain't so - Mark Twain
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334446#334446
Message 3
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Subject: | Re: slow day on the list |
It looked like a fairly comfortable plane to fly. I can't imagine my
flight instructor in his 150 allowing me to fly like that.
Thanks for the video
Larry
Note: If you forward this email, please delete the forwarding history,
which includes my email address.
----- Original Message -----
From: robert bean
To: kolb
Sent: Saturday, March 19, 2011 1:47 PM
Subject: Kolb-List: slow day on the list
Here is the original incarnation of N3851E that I flew for 25 years.
forgive the editing, trying to chop it down to youtube's 15 minutes
ain't easy.
http://www.youtube.com/watch?v=M39q-pbdn-o
BB
Kolb MkIII, N3851E
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Message 4
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During preflight this afternoon I found a crack in the muffler/expansion pipe junction
of my 582 muffler. This same general area has caused me problems before
with different Rotax engines, and has also caused several other local flyers
crack problems in this same place.
Attached is a picture of the muffler after I welded it and after I got done flying
for the day. Thought about taking a picture before I welded it, but it was
already 6 PM, and I wanted to just fix it and go.
Welded it on the airplane, obviously haven't painted it yet. The red line is where
the crack was, discovered the crack by first seeing exhaust carbon residue
that had come out of it. Since the airplane was already out on the runway in
front of the hangar, rolled the welding cart with the oxy/acetyline tanks out
to the airplane. Once I got the metal red hot, I could see the crack was at least
an inch longer to the left and 2.5 inches longer to the right than the original
crack appeared to be, so it was progressing.
My MKIII uses what they call the "Quicksilver" style expansion pipe, this is the
first time I have seen a problem with this style, all the other failures have
been with the "Curlyque" sidemount style like the Kolbs typically use, and have
involved 447, 503 and 532 engines.
On those, the failure typically begins on the weld along the outside of the pipe,
the pipe splits along the edge of the welded flat seam and then the pipe begins
to crack and separate around the junction of the pipe and muffler. Several
of us have discussed this and it is our opinion that the pressure pulses eventually
fatigue the welded joint and cause a crack.
However, one of the failures was on a 503 about 12 years ago and in that one there
were two cracks that started right in the rounded side of the curlyque. Apparently
that portion of the pipe takes a lot of pressure pulse abuse.
Ed and I discussed this for a while this afternoon, because he has a curlyque on
his FSII, and you cannot see the front side of the welded seam from the rear
of the wing. The only way you can see it is to stand on a stool in front of the
wing and look over the wing to see it, but IMO, this ought to be a checklist
item, because we have seen enough of them go bad that it is an obvious weak
point.
And if you are flying and it occurs to you that maybe your engines is a bit louder
than it was - find a suitable place to land and check this area out. When
the whole side half of the curlyque came loose on my 532, I was 5 miles from home,
and by the time I got on the ground, the only thing holding that half of
the curlyque expansion pipe to the airplane was the area adjacent to the ball
joint, everything else had already broken. The Ivoprop would not have been happy...
AND IT WAS LOUD! The wife heard me coming 3 miles away... From inside the
house... With the doors and windows shut...
So if your Rotax 2-stroke suddenly gets really loud - land. Unless you have a metal
sheathed Warp Drive prop that can suck up that detached half, (good test,
eh?) and would prefer to just buy a new cone for $200 rather than repair yours.
Then you can keep going...
Richard Pike
MKIII N420P (420ldPoops)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334472#334472
Attachments:
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