--- In X-Air_Ultralight_Aircraft@..., Gordon Bailey
<gordon.bailey@j...> wrote:
Anyone got true performance figures to compare the 618, 912 and the
Jabiru 2.2?
We had a Thruster T500 at our airfield that had a 912 mounted. It
seemed to work
OK (I flew in it), however I couldn\'t help think the advantages of
the bigger
motor/prop may have been negated somewhat by the drag/weight
increase.
Ofcourse, no one can dispute the 912 reliability though, which is a
big bonus.
My experience shows that the 618 and Jabiru are very similar in
performance - although the benifits of near silence in cruise is
appreciated over sensitive areas.
Our Jabiru performes very well except for climb and this directly
relates to the engine mount which makes the thrust line to high (the
propeller sits too high) if the standard engine mount was replaced
with a new one to specificcaly suit the Jabiru engine then i am sure
it would perform better in climb.
The 912 i expect would perform very well but no-one has done that
instalation in Australia, both the 912 and the Jabiru are heavier
than
the 618.
Fuel consumption is nearly identical between the Jabiru and my 618
although some of our customers are using up to 18 liters per hour on
there 618's ?? - (they probably need to be set up a bit better).
I am sure if someone could come up with some sort of engine fairing
for these engines that better consumption figures could be acheived.
If you look at the size of say the Jabiru hanging out the front and
imagine the wind resistance..... it must have a big effect
