Today's Message Index:
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1. 04:26 AM - rotax 447 propeller recomendation high temps (tombaisley)
2. 06:06 AM - Re: rotax 447 propeller recomendation high temps (Richard Pike)
3. 06:27 AM - Re: rotax 447 propeller recomendation high temps ()
4. 06:50 AM - Re: rotax 447 propeller recomendation high temps (Beauford)
5. 06:52 AM - Re: rotax 447 propeller recomendation high temps (tombaisley)
6. 03:35 PM - Landing gear (axle material) (dutrac)
7. 03:41 PM - Re: Landing gear (axle material) (Richard Girard)
8. 07:41 PM - Slipping turn (joepilot503)
Message 1
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| Subject: | rotax 447 propeller recomendation high temps |
I have a FS1 w/ 447 2.58 box, spinning a 66" two blade IVO. I am have trouble
with high EGT and CHT.
With the propeller pitched to give me 6200rpm at climb out ,I'm seeing EGT in
the 1100-1150 at 5700rpm which seems to cause the CHT to start climbing thru
400F. If I increase the prop pitch to 6000 rpm at climb out my EGT are stable
at 1050 or so, but I'm still seeing CHT of 390-410F.
I also have high EGT ( 1150 - 1230 ) in the 3900-4600rpm range, I suspect that
may just be the nature of the beast.
I spoke with IVO prop and his recommendation was "more pitch", But that seems
to aggravate the CHT.
I'm starting to wonder if I'm over propped and should maybe cut down the diameter
or go to a three blade prop?
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| Subject: | Re: rotax 447 propeller recomendation high temps |
You are running stock jets and have pressure/vacuum tested your engine I assume?
Do you have an intake silencer? Because it will cause you to lose a hair of
power, and IMO you can't afford to lose any power, because you already have too
much prop.
Back in the day when I had a 532 on the MKIII, IVO started me out with a 3 blade
64" - that was way too much prop for that engine, took one blade off and it
was a sweetheart. Then I put a 2 blade 66" on it and that was good too. If I
remember correctly (HAH) my buddies ran 3 blade 62" IVO's on their 503's. I am
running a 68" 2 blade on my 582, and you are trying to run almost as much prop
on a much smaller engine, so I would guess you are way overloaded on prop.
Before I spent any money on another prop, I would start by shortening your current
blades a bit at a time and see what happens. I suspect that when you get down
around 62" - 64" you will find things to be OK assuming that all else is
as it should be.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
richard (at) bcchapel(dot)org
Kingsport, TN 3TN0
Now faith is the substance of things hoped for, the evidence of things not seen.
Hebrews 11:1
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| Subject: | Re: rotax 447 propeller recomendation high temps |
---- tombaisley <tombaisley@yahoo.com> wrote:
> I'm starting to wonder if I'm over propped and should maybe cut down the
diameter or go to a three blade prop?
Tom B/Folks:
I prop a Kolb by flying straight and level, wide open throttle. A correctly propped
engine should turn the max continuous red line. This will give best cruise
and climb performance with a fixed or ground adjustable prop.
I flew a 60X30 Culver two blade fixed pitch prop on my original Firestar and 447.
This gave me 6500 rpm straight and level, WOT.
john h
mkIII
Burns Junction, OR
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| Subject: | rotax 447 propeller recomendation high temps |
I have a FS1 w/ 447 2.58 box, spinning a 66" two blade IVO. I am have
trouble with high EGT and CHT.
I suspect that may just be the nature of the beast.
-------------------------
Brother Baisley:
I run exactly the same 447/gearbox/prop combination as you, sir...
My prop is loaded to yield exactly the same rpm on climb out as yours...
My EGT/CHT temps mirror yours exactly....
I have, after much carburetor twiddling, fan fumbling, prop pitch changes, a
thermocouple replacement festival,
and several sessions of peering and poking at rings through exhaust ports,
finally come to the
conclusion that the little Nazi S.O.B. just likes to run hot. I don't
know, but strongly suspect, that
performing a carbon-fiber circumcision on your IVO won't solve the problem;
that is just
another way to reduce prop loading and the effects of that upon the EGT/CHT
balance is already
known and understood. Am pretty sure there is no free thermal lunch hiding
in there anywhere.
I place the issue of chronic 447 overheating in the same category of
intractable problems as matrimony,
stagflation and oversize prostates. They are built into the bedrock of the
universe and we might as
well get used to 'em...
Accordingly, I have perfected and adopted the Beaufordian school of 447
operational philosophy... i.e.
run the chrome-plated hell out of the damn thing and don't worry about it.
It works fer me... may not
work fer you... I think of it as rather like Dr. Stangelove's approach...
Quit worrying about the Bomb and
learn to love it.
Worth what ye paid fer it...
Do Not Archive
Overheated beauford
FF-076
Brandon, FL
p.s. Brother B: Should you come across the 447 holy grail and figure out
how to make it run cooler,
please write home and share it without delay...
b.
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| Subject: | Re: rotax 447 propeller recomendation high temps |
I'm running stock jets, needle, and clip position. No intake silencer, stock exhaust.
I replaced the head, base, intake, and exhaust gaskets. I had found that
the spark plugs were cross threaded and not sealing. I have not pressure tested,
but this engine is very fresh
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| Subject: | Landing gear (axle material) |
Hi Folks,
I have a Kolb MKII that I've given a few hard landings. The axles have bent and
I've used a hydrolic press to straighten them once. After doing so it wasn't
but a couple landings later that I noticed they were pretty well bent again.
I talked to a factory rep and he told me that they don't recommend straightening
them more than once. Whether right or wrong, I'm going to listen to that advice
and replace them both.
My question to the group then is what grade of aluminum are the axles made out
of?
Any help is appreciated.
Thanks!
Duane
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| Subject: | Re: Landing gear (axle material) |
7075-T6
Rick Girard
On Thu, Jun 21, 2012 at 5:35 PM, dutrac <dlrans@gmail.com> wrote:
>
> Hi Folks,
>
> I have a Kolb MKII that I've given a few hard landings. The axles have
> bent and I've used a hydrolic press to straighten them once. After doing so
> it wasn't but a couple landings later that I noticed they were pretty well
> bent again.
>
> I talked to a factory rep and he told me that they don't recommend
> straightening them more than once. Whether right or wrong, I'm going to
> listen to that advice and replace them both.
>
> My question to the group then is what grade of aluminum are the axles made
> out of?
>
> Any help is appreciated.
>
> Thanks!
> Duane
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=376255#376255
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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Does anybody out there with a Kolb do slipping turns from downwind to landing?
I was doing them in a j-3 and want to try it in my firestar but a friend of mine
didn't think it was a wise thing to do, or to be a legitimate maneuver. any
feedback appreciated.
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