Nigel,
Thanks for the reply, the switch setting sounds a good idea.
I did question the previous owner if it is possible to overspreed the engine
as the NSI has an electronic rev limiter so will that make a difference? (Im
not sure it would overspeed would it)
I understand the limiter is set a 5600 and next time im rolling I will
inspect how close it gets to that if I don't add that little bit of fine.
I was interested to see an amendment from NSI which increase the max
allowable rpm from the previous limit of 5600 to a never exceed speed of
6500 and the max continuous change from 5500 to 5800. I find this a bit
confusing which makes me wonder how much of the 100hp I get at 5600 the
previous and currently set limit. Im not suggesting I want to mess with it
but interesting none the less.
Im kind of thinking that the only concern with the MP is the only way I
could mess it up is allowing the engine to over rev if I had the nose down
and full throttle selected.
Also still interested in settings for best climb which I can only assume
must be best achieved at fully fine.
Thanks and regards
Kevin
-----Original Message-----
From: forum-owner@europaclub.org.uk
Subject: Re: VP prop
Message text written by INTERNET:kevin@eastyorkshire.co.uk
>What is the significance of the manifold pressure in more detail. In the
cruise it sorts itself out if I set 3400 rpm and fully course I get about
110 knots and 24 inches.<
It is usual to set the rpm with the VP prop and the MAP with the throttle.
Your numbers sound OK to me although I have a Rotax and I am not that
familiar with the Subaru.
>Is it a worry if the manifold pressure is very low, for example as I
throttled right back and started to fine the prop I noticed it was very
low,
do I need to do it in stages?<
No. Closing the throttle restricts the airflow and therefore lowers the
MAP. This is quite normal. Obviously gentle throttle movements are kinder
to the engine.
>The check list says set prop to mid point downwind but the previous owner
said fully fine which sounds right incase I need to do a go around.<
The owner is correct. Just make sure that fully fine doesn't cause an
overspeed during either take-off or go around. If it does you need to put a
slightly thicker spacer inside the hub. This is an awkward job with the NSI
but once set correctly should never need altering again. I guess that this
should be already correct with the number of hours your Europa has already
flown.
>On departure as I leave the ground he showed me to add a touch of course
after leaving the ground (to bring the Rpm down a touch. What setting
should
I use for a sustained climb? or to go from cruise to climb?<
A good technique to aid engine life. Just make sure your climb performance
is adequate for the surrounding terrain before reducing RPM. On the
Airmaster these RPM settings are set on a rotary switch and are programmed
for the engine they are matched to which helps to reduce workload at a busy
stage of flight. With all the gizmos it is easy to spend too much time
looking at the panel rather than looking outside. I don't know what the
recommended continuous RPM setting is for the Subaru but I am sure there is
someone out there who does.
Nigel Charles
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