larry(at)macsmachine.com
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 Posted: Sun Jun 26, 2011 5:10 pm Post subject: [Probable Spam] Aircraft angle of Incidence in flight and en |
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HI Jeff,
I fly a Subaru, but the problem you relate is similar in that I found that I have a much cooler engine when the prop is set long
to 17-1/2 degrees using a Warp Drive 70 inch dia. When I had the prop set at 15 to 16 degrees I found myself with higher engine temps, nose a little up, which on a hot day makes a serious difference. With the long prop the engine pulls thru a faster airspeed and the angle of incidence will change to bring the nose down and the center of lift back on the wing. Higher speed, lower temps and lift moving rearward. Again it’s a Subaru and being a bit slower than the Jabaru 3300, there’s still a best speed. Mine is 133 mph wide open with long pitch on the prop. The nose is much more level or even trimmed down a bit in level flight at 125 mph or better. Perhaps that’s why you’re seeing your plane’s flying less efficiently.
Check out that prop pitch!
Take care, Fly safe,
Larry McFarland 601HDS at www.macsmachine.com
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Jeffrey J Paris
Sent: Sunday, June 26, 2011 5:17 PM
To: jabiruengine-list(at)matronics.com; zenith-list(at)matronics.com
Subject: [Probable Spam] Aircraft angle of Incidence in flight and engine cooling
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
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