---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Sun 06/26/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:20 PM - Aircraft angle of Incidence in flight and engine cooling (Jeffrey J Paris) 2. 04:19 PM - Re: Aircraft angle of Incidence in flight and engine cooling (Martin Hone) ________________________________ Message 1 _____________________________________ Time: 03:20:18 PM PST US From: "Jeffrey J Paris" Subject: JabiruEngine-List: Aircraft angle of Incidence in flight and engine cooling Wizards! =C2- Question: =C2-Could the angle of incidence in flight effect the ability of an engine to cool? =C2-I ask this because, I truly believe that I have my Bing Carb dialed in as far as EGTs, but in cruise I still have pesky CHT is sues on cylinder 2,3,4 and #4 is always in the 315F range. =C2-In a sustai ned climb I, things head for toast quickly! =C2- When we purchased our FWF kit from Jabiru USA early version, we figured that they had everything figured out. =C2-Obviously, in my case although we fo llowed the install instructions to a tee, we still are playing with all thin gs engine and cowl. =C2-In terms of the angle of incidence, my friend and I went flying the other day =C2-and he took a picture of me and I believe it looks as if that when in cruise my nose of the aircraft is up, which migh t account for some sort of impeded airflow into the cowl. =C2-I'm asking t his question, becasue when we all obviously point the nose down in descent w e get better airrflow and CHT's tend to come down. =C2- Any thoughts on this matter. =C2- CAVU, =C2- Jeff Paris Ni196ZP Jab 3300 Ch601XLB =C2-N127ZP Jab 3300 Eurpoa Monowheel in drydock =C2- ________________________________ Message 2 _____________________________________ Time: 04:19:06 PM PST US Subject: Re: JabiruEngine-List: Aircraft angle of Incidence in flight and engine cooling From: Martin Hone Hi Jeff, The angle of incidence, or more correctly, the angle of the relative airflow will certainly have an effect on cooling. It is well known that the angle of a radiator in a watercooled installation is important, and the same can be said with cowlings on aircooled engines. As you have noticed, the inlet ramps in the cowl may not be efficient at all speeds, and climb angle is one that we tend to overlook. We should look at having the most direct airflow path in the climb attiitude rather than in cruise when engine temps are an issue. If your aircraft is flying in a nose up attitude in cruise, you may have a trim or weight and balance issue, or just maybe you were flying slower than normal when the pic was taken. Something to look at. Cheers Martin On Mon, Jun 27, 2011 at 8:16 AM, Jeffrey J Paris wrote: > Wizards! > > Question: Could the angle of incidence in flight effect the ability of an > engine to cool? I ask this because, I truly believe that I have my Bing > Carb dialed in as far as EGTs, but in cruise I still have pesky CHT issues > on cylinder 2,3,4 and #4 is always in the 315F range. In a sustained climb > I, things head for toast quickly! > > When we purchased our FWF kit from Jabiru USA early version, we figured > that they had everything figured out. Obviously, in my case although we > followed the install instructions to a tee, we still are playing with all > things engine and cowl. In terms of the angle of incidence, my friend and I > went flying the other day and he took a picture of me and I believe it > looks as if that when in cruise my nose of the aircraft is up, which might > account for some sort of impeded airflow into the cowl. I'm asking this > question, becasue when we all obviously point the nose down in descent we > get better airrflow and CHT's tend to come down. > > Any thoughts on this matter. > > CAVU, > > Jeff Paris Ni196ZP Jab 3300 Ch601XLB N127ZP Jab 3300 Eurpoa Monowheel in > drydock > > > * > > * > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.