Today's Message Index:
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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
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| Subject: | 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
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| Subject: | Re: Aircraft angle of Incidence in flight and engine |
cooling
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 <jeffrey-j-paris@excite.com
> 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
>
>
> *
>
> *
>
>
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