---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Mon 01/16/23: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:11 AM - Re: aileron to wing gap seal (Ducati SS) 2. 11:35 AM - Re: Bing 54 (Ducati SS) 3. 11:43 AM - Re: Bing 54 (Ducati SS) 4. 01:49 PM - Re: Re: Bing 54 (Stuart Harner) ________________________________ Message 1 _____________________________________ Time: 11:11:21 AM PST US Subject: Kolb-List: Re: aileron to wing gap seal From: "Ducati SS" ????? Considering all the work which was sometimes stressful, such as rigging the wings and tail as I built my Firefly, the gap seal was fairly straight forward and easy. why not just do it as the plans outline? Straight forward and easy. The only drawback I have encountered and it could be significant in the absence of a proper preflight is that the full span gap seals can collect debris. But full span piano hinges would have the same drawback. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=509956#509956 ________________________________ Message 2 _____________________________________ Time: 11:35:22 AM PST US Subject: Kolb-List: Re: Bing 54 From: "Ducati SS" First a description of how an en richer works and then what I fear is a functional drawback when applied to our aircraft. A true choke mechanically restricts air flow into the venturi. This method is somewhat tolerant of various throttle settings. The enricher is a completely independent circuit which relies on high vacuum ahead of the slide to pull fuel up from the float bowl where it exits ahead of the slide. It takes a very small rise of the slide to destroy the necessary vacuum and defeat the enricher circuit. I ran into this repeatedly as a motorcycle snowmobile mechanic. Customer would state that their new machine was wonderful with the exception that it would not start cold. I would say lets go give it a try, as I watched they would inadvertently open the throttle just by the smallest amount, this resulted in a no start. I would then tell them to take their hand completely away from the throttle and use one finger to push the starter button, instant start. Sooo my concern with these engines pressed into service as aircraft power plants is that we need to run a fairly high slide position to eliminate gearbox chatter. I really doubt the universal effectiveness of enrichers, Like many snowmobiles I installed a pump type primer on my Firefly and disabled the enricher. Very effective and easy starts. Just position the primer within easy reach as it will require an additional pump or three as the engine warms. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=509957#509957 ________________________________ Message 3 _____________________________________ Time: 11:43:36 AM PST US Subject: Kolb-List: Re: Bing 54 From: "Ducati SS" I should add that anyone using a psru with a clutch could probably use an enricher. For the remainder of us we have a prop load as soon as the engine starts which requires the higher slide position. Sadly it is almost universal to mislabel an enricher as the choke which it surly is not. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=509958#509958 ________________________________ Message 4 _____________________________________ Time: 01:49:14 PM PST US Subject: Re: Kolb-List: Re: Bing 54 From: Stuart Harner An enricher is definitely not a choke even when Bing labels the lever with the word "Choke" on it. A misnomer for sure. However, I don't quite understand when you said the enricher does not work unless the throttle is closed. I have used the enricher to keep the EGT down during partial power descents. Unloading the engine by reducing power during descent often causes my EGT warning to go off. I pull a little enricher to keep it from running so lean and it cools back down. This seems to indicate that at least some fuel is being drawn in with the slide at about half throttle. Of course starting and half throttle are two completely different things and may not effect the enricher in the same way. Stuart On 1/16/23 13:35, Ducati SS wrote: > > First a description of how an en > richer works and then what I fear is a functional drawback when applied to our aircraft. > A true choke mechanically restricts air flow into the venturi. This method is somewhat tolerant of various throttle settings. > The enricher is a completely independent circuit which relies on high vacuum ahead of the slide to pull fuel up from the float bowl where it exits ahead of the slide. It takes a very small rise of the slide to destroy the necessary vacuum and defeat the enricher circuit. I ran into this repeatedly as a motorcycle snowmobile mechanic. Customer would state that their new machine was wonderful with the exception that it would not start cold. I would say lets go give it a try, as I watched they would inadvertently open the throttle just by the smallest amount, this resulted in a no start. I would then tell them to take their hand completely away from the throttle and use one finger to push the starter button, instant start. Sooo my concern with these engines pressed into service as aircraft power plants is that we need to run a fairly high slide position to eliminate gearbox chatter. I really doubt the universal effectiveness of enrichers, Like many snowmobiles I installed a p! > ump type primer on my Firefly and disabled the enricher. Very effective and easy starts. Just position the primer within easy reach as it will require an additional pump or three as the engine warms. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=509957#509957 > > ------------------------------------------------------------------------------------- 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.