Whilst complying with the LAA requirement for a throttle stop, it's
useful
to set up the cables so that the carb stops are reached first, followed
closely by the stop on the throttle lever itself if the lever is
deliberately pulled closed against the throttle lever stop. This limits
any
excess strain that can be applied to the cables, but provides a useful
facility to temporarily pull down the idle speed in flight (which in any
case will still always be well above the static setting, as the forward
motion drives the prop). As soon as the deliberate backpressure on the
lever
is released, 'normal service' is resumed
This facility makes a usefully large addition to rate of descent and is
helpful for landing in to short strips; it's like having an airbrake!
Duncan McF.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Carl
Pattinson
Sent: 30 May 2013 09:23
Subject: Europa-List: Throttle Stops
I seem to recall in the early days of Europa that the PFA dictated that
we
should install a physical throttle stop on the throttle lever (in the
cockpit).
I have never really understood the purpose of this as the carburettors
have
their own stops as IMHO one seems to fight against the other. As soon as
you
increase the idle RPM using the adjuster screws on the carb, the
throttle
lever is pulled forward by the cables, moving the lever away from the
cockpit stop.
We have flown quite happily with the carb stop limiting the slow running
with a gap of about 2 mm between the rear of the throttle lever and the
stop block (tufnol). However, we have just overhauled the carbs and are
resetting the balances etc so were wondering if this omission needs to
be
addressed - it would just be a matter of elongating the holes in the
throttle stop.
Reading through various articles on Rotax/ Bing carburettor balancing I
note
that these also stress the need for a cockpit end stop but give no
explanation as to why.
I'm sure there is a good reason, just need someone to cast some light on
this.
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