Dave,
Have you got any details of how to connect and set up the 4700 using
the computer? I would love to do this on my MG as the VNE is only 126kts
with the motor glider wings fitted.
Ian Cook
G-CBHI
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of David Watts
Sent: 13 October 2015 21:15
Subject: Re: Europa-List: Re: Course pitch stop setting Airmaster AP332 for
high altitude
Jonathan,
I totally agree with all you say.
At 1,100 hours and 100 hours after changing my engine to the 912S, I fitted
the Airmaster propeller.
I immediately set the cruise pitch to 4700rpm through a connection with my
computer and I have now done 1,100 hours with this setup and I am completely
happy with it.
I usually cruise at between 24 and 25 inches manifold pressure which gives a
lovely smooth and quiet performance and opening up to 26 inches gives me 140
knots cruise.
I have tested it fully loaded and found that I can leave it in cruise
setting and climb at just over 500 fpm after take off, fully satisfying any
LAA requirements.
Dave Watts
G-BXDY Classic Monowheel 2,200 hours
> On 13 Oct 2015, at 20:19, jonathanmilbank <jdmilbank@yahoo.co.uk> wrote:
>
> --> <jdmilbank@yahoo.co.uk>
>
> My Airmaster gives 5000 rpm when set to Auto and Cruise. I've been using
this excellent propeller hub for over 15 years and had it first inspected,
then modified for the wider blades after fitting a 100hp engine. I've never
seen anything written which states that you can't set the coarse pitch stop
for less than 5000 in manual cruise.
>
> My Rotax 912ULS isn't fitted with a turbo and therefore can't be
"over-boosted" no matter how low the rpm. The only sensible constraint I was
given about setting the coarse stop, was to ensure that if stuck at the
coarse limit for some reason, then in the event of having to go around late
on final approach, the aircraft should still be able to climb safely at low
rpm with full throttle, flaps down and heavily laden. This is easily done at
low airfield elevations, with the coarse pitch stop set to allow 4700 rpm in
my normal 115 - 120 kt cruise.
>
> I can't see the point of being allowed to cruise fast using lots of power
while not being allowed to enjoy the benefit of a quieter engine running at
lower, quieter rpm. It doesn't make sense when considering that this touring
aircraft should be set up to benefit from quieter engine operations to
afford the occupants a more restful flight and also safer due to reduced
noise distraction.
>
> For many years I have cruised far and wide at around 120 knots with the
rpm set manually to around 4700 with no ill effects. The reduction in noise
generated by taking the rpm 300 lower is very agreeable.
>
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> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=447899#447899
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