Hi, thanks for info, thats very interesting. The prop was recently
replaced due to corrosion and was set up for me by Metal Seagulls in
Wales, including test flying. Not sure what its set at but think its
now set at what is specified in the manual? whereas before it was
slightly different.
C of G is interesting, I might try some experiments. Another 9112
Falcon owner reports they get 12L per hour.
At the moment mine is running cool and I need to adjust the radiator
shielding. Im hoping this will also improve fuel use.
regards,
Jonathan
G-BZWC
On 29/07/2022 12:47, Seamus O'Donnell
wrote:
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?
your performance with the 912 is not that
good, you are flying at?a very high rpm,?the?one I built years
ago cruised at 4200 55kts never burned more than 12 litres and
was also using the DUC prop, have you tried changing pitch on
prop
weight and CG is important and
the?majority of the UK xairs have a very forward CG, all xairs
no matter which engine fitted fly much better with an aft CG
and especially the falcon which was never as good as the
standard xair
?Seamus
----- Original Message -----
Sent: Friday, July 29, 2022
9:45 AM
Subject: Re: [XAIR]
replacement engine
I have an X-Air F? ( Falcon in the UK ) with Rotax 912 and it
works very well.? Performance is no greater than a 2 stroke but
much greater reliability. Theoretically it should use less fuel
but mine burns around 14 litres an hour. Previous owner said it
burnt 12 litres an hour . The difference might be because I
fitted heated carb bodies when I bought it to prevent carb ice.
If attachments work there is a photo of the engine installation
attached.? The Engine mount is special for the 912 and the
forward engine struts are shortened.
There are some weight concerns. Mine was the development
aircraft and has lightweight wheels, floor and originally had a
smaller single tank.
It now has double tanks ( 55 Litres )? and as I fly alone a long
range tank with another 20 litres, so now aircraft endurance is
far greater than pilot endurance !! - more than 5 hours.
In the UK there are a couple flying with the D-motor which seems
an interesting combination.? The only thing I don't like with
the 912 is flying with high revs ( cruise 4800-5000 rpm ) which
makes for a noisy cockpit although a recent Bose A20 has
improved the situation. The D-Motor , like the Jabiru flies with
half the revs so would be more comfortable but for me
reliability is the No consideration.? I like the D Motor but
would want to wait a few years to see how the reliability is
before flying with one.
Regards,
Jonathan
On 29/07/2022 10:13, Michael Coates
wrote:
Too heavy for the X-Air Standard....??? They own
the X-Air Airframe as their test bed but cant use it because
of the weight etc....???? However it looks promising !
Clive Cunningham wrote on
29/07/2022 5:27 pm:
Keep an eye on Radial Motion. 3 cyl
air cooled radial engine being made in Australia. Looks
like a winner!
Clive Cunningham
K&M HD Motorcycles
U2 5-9 Kingston Ave?
Richmond?
South Australia 5033??
Ph +61 8? 8234 1090?
kmmotor@...
kmmotorcycles.com.au
--
With regards, Michael Coates
AU +61 7 5522 0583
USA +1 213 984 1237
PIPISTREL AIRCRAFT DEALER OF THE YEAR 2012
Winner of the EAA August Raspet Award 2012
PIPISTREL AIRCRAFT DEALER OF THE YEAR 2017
mailto:mcoates@...
skype name: xcomavionics
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