Today's Message Index:
----------------------
1. 04:56 AM - Re: Firefly/447 RPM question (olendorf)
2. 07:37 AM - Re: second chantz chutes (Richard Pike)
3. 07:48 AM - Re: Firefly/447 RPM question (Richard Pike)
4. 10:14 AM - Re: Re: Firefly/447 RPM question (Stuart Harner)
5. 10:14 AM - Re: Re: Firefly/447 RPM question (Stuart Harner)
Message 1
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Subject: | Re: Firefly/447 RPM question |
stuart(at)harnerfarm.net wrote:
>
> ...
> Less pitch will give more RPM but less thrust so that may be the way to go.
> There is no shortage of thrust, that's for sure!
>
> I need to go back and review to see if less pitch increases EGT or if I need
> a little more.
> .....
> Stuart
>
> --
Less pitch will actually increase your EGT. You can try this test. Fly straight
and level watch EGT. Push nose down to unload prop a little, simulating less
pitch. Watch which way EGT goes. It will go up.
That's also your danger zone while decending at lower throttle you will be in that
hot zone of 4500 rpm already, then with the added unloading of the prop during
decent, you will see your EGT spike. I will either throttle back more to
get out of the zone or decend with more power. Depends on my approach.
The ideal situation would be to get a jet needle with a different curve that didn't
lean out at 4500rpm but so far I haven't found one. There was talk about
one on this forum a few years back. I bought it and it was way too thick so
I am back to stock.
I think the 3 blade on a Firefly is perfect. Lots of climb performance but less
top speed. Like you found the top speed isn't as much fun anyway. Seems uncomfortable.
It's much more comfortable in an enclosed cockpit where the wind,
noise and buffetting are reduced but whats the fun in that?
--------
Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop
Schenectady, NY
http://sites.google.com/site/kolbfirestar/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441279#441279
Message 2
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Subject: | Re: second chantz chutes |
I think they may be belly up. I have an old 2nd Chantz in my MKIII, it uses one
of the compressed nitrogen launchers which is still in the green, so I keep toting
it around. I have sent the canopy off to Skydive Kentucky and had them air
it out, check it and repack it a time or two.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
There are two kinds of people: those who say to God, 'Thy will be done,' and those
to whom God says, 'All right, then, have it your way.'
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441286#441286
Message 3
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Subject: | Re: Firefly/447 RPM question |
If you have not seen this before, or if trying to figure out jetting and prop load seems non-intuitive, maybe this will help: http://oh2fly.net/oldpoops/pg11.htm
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
There are two kinds of people: those who say to God, 'Thy will be done,' and those
to whom God says, 'All right, then, have it your way.'
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441288#441288
Message 4
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Subject: | Re: Firefly/447 RPM question |
Ha! Yes, that is where I saw it before. Just could not remember the
details.
Thanks for the link. There are lots of other sources too, some I have read,
some not. This one is nice and concise with pictures even!
More flying, less thinking.
Thanks,
Stuart
-----Original Message-----
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Richard Pike
Sent: Saturday, April 25, 2015 9:48 AM
Subject: Kolb-List: Re: Firefly/447 RPM question
--> <thegreybaron@charter.net>
If you have not seen this before, or if trying to figure out jetting and
prop load seems non-intuitive, maybe this will help:
http://oh2fly.net/oldpoops/pg11.htm
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
There are two kinds of people: those who say to God, 'Thy will be done,' and
those to whom God says, 'All right, then, have it your way.'
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441288#441288
Message 5
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Subject: | Re: Firefly/447 RPM question |
That is exactly where it happens, powered back for descent.
I guess that makes sense, energy not used by the prop gets dumped overboard
in the exhaust.
In any case, either getting out of the mid-range or adding a little "choke"
fixes it.
I get nice even temps on both cylinders everywhere but mid-range. The clip
was in the top slot and I dropped it to the second which is actually the
recommended starting point.
At this point I think it is dialed in fairly close and I don't want to make
any more changes until I can get some more hours on the engine, heck it is
still new. Also I have yet to fly it at temps above 70, so I expect things
to change some as the weather warms.
Probably the best thing to do would be quit thinking about flying and start
actually flying. Not today though, cool, cloudy and windy. :(
Thanks again,
Stuart
-----Original Message-----
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of olendorf
Sent: Saturday, April 25, 2015 6:56 AM
Subject: Kolb-List: Re: Firefly/447 RPM question
stuart(at)harnerfarm.net wrote:
>
> ...
> Less pitch will give more RPM but less thrust so that may be the way to
go.
> There is no shortage of thrust, that's for sure!
>
> I need to go back and review to see if less pitch increases EGT or if
> I need a little more.
> .....
> Stuart
>
> --
Less pitch will actually increase your EGT. You can try this test. Fly
straight and level watch EGT. Push nose down to unload prop a little,
simulating less pitch. Watch which way EGT goes. It will go up.
That's also your danger zone while decending at lower throttle you will be
in that hot zone of 4500 rpm already, then with the added unloading of the
prop during decent, you will see your EGT spike. I will either throttle
back more to get out of the zone or decend with more power. Depends on my
approach.
The ideal situation would be to get a jet needle with a different curve that
didn't lean out at 4500rpm but so far I haven't found one. There was talk
about one on this forum a few years back. I bought it and it was way too
thick so I am back to stock.
I think the 3 blade on a Firefly is perfect. Lots of climb performance but
less top speed. Like you found the top speed isn't as much fun anyway.
Seems uncomfortable. It's much more comfortable in an enclosed cockpit
where the wind, noise and buffetting are reduced but whats the fun in that?
--------
Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop Schenectady, NY
http://sites.google.com/site/kolbfirestar/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441279#441279
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