---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Sat 04/25/15: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 04:56:45 AM PST US Subject: Kolb-List: Re: Firefly/447 RPM question From: "olendorf" 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 _____________________________________ Time: 07:37:31 AM PST US Subject: Kolb-List: Re: second chantz chutes From: "Richard Pike" 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 _____________________________________ Time: 07:48:25 AM PST US Subject: Kolb-List: Re: Firefly/447 RPM question From: "Richard Pike" 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 _____________________________________ Time: 10:14:13 AM PST US From: "Stuart Harner" Subject: RE: Kolb-List: 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 --> 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 _____________________________________ Time: 10:14:24 AM PST US From: "Stuart Harner" Subject: RE: Kolb-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.