psm(at)att.net
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 Posted: Sun Jun 26, 2011 2:43 pm Post subject: Aircraft angle of Incidence in flight and engine cooling |
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Hi Jeff,
I hope to have better info on this in a week or two, but for now all I can do is comment on the theory . . .
My FWF from the same source included fiberglass ducts - one for each side of the engine. It also included instructions that said I would need to adjust the deflectors inside the duct to make all the cylinders have similar temperatures. I don't see how these deflectors would impact #2, but 3 and 4 probably need larger deflectors to get more air flow.
This is a normal problem (based on years of comments on this list) and Pete and his friends at Jabiru USA can probably give you very good advice over the phone. The more data you can feed them the more they are likely to tell you the solution on the first pass. You should give them a call.
I spoke to Pete at Sun n fun (Tornadoes and Mud) and he made some wonderful comments about how to get the proper jet setup. I forgot the details but it was something like recording the EGTs in a cruise -full power- climb and give them a call.
Good luck,
Paul
XL - first engine start -probably- tomorrow.
On 6/26/2011 3:16 PM, Jeffrey J Paris wrote: [quote] 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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