Today's Message Index:
----------------------
1. 12:16 AM - Re: Aircraft angle of Incidence in flight and engine cooling (Rob Turk)
2. 12:44 AM - Re: Aircraft angle of ATTACK in flight and engine cooling (FLYaDIVE)
Message 1
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| Subject: | Re: Aircraft angle of Incidence in flight and engine |
cooling
Jeff,
With 315F in cruise I would be very nervous, that's not good.
Grab a copy of the installation manual for your engine at
www.jabiru.net.au. This manual has an entire chapter devoted to engine
cooling, including the impact of airplane orientation with regards to
the airstream. The manual offers methods to measure the effectiveness of
your installation, as well as hints on how to improve it.
While at it, get a copy of JSB016-1 service bulletin, which describes
how to add cowl lips to improve cooling performance.
What kind of prop do you use? Some do not produce any airflow at the
root of the prop.
Rob
On 6/27/2011 12:16 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
> *
>
>
> *
Message 2
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| Subject: | Re: Aircraft angle of ATTACK in flight and engine cooling |
The term is Angle of ATTACK not angle of incidence.
Two of the biggest mistakes people make when breaking in an engine are:
1 - Climbing out at Vx or Vy with a new engine and
2 - Throttling back when they see the CHT's increase.
The third and fourth are:
3 - Flying to high in altitude or density altitude and
4 - Leaning.
>From your description it sounds like you did item 4 when you peaked out the
EGT.
And why would the plane be flying nose high unless the thrust angle of the
engine was way down or the throttle is pulled back... Slower than full
throttle flight; item 2.
The plane is not over weight or loaded aft is it?
Barry
On Sun, Jun 26, 2011 at 6:16 PM, 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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