开云体育

----- Original Message -----
From: xair@m...
To: X-Air_Ultralight_Aircraft@...


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).

Better in which way? I get about 16.5 L/h at 60Kts, 18 at 65Kts
and over 20 at 70Kts, but that should be normal??
I can also stay aloft on 8.5L/Hr too!

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
Fairing for the 618 would be lovely too!



Reply;

The X-Air has a definate 'step' in it's performance... for about the
first month i floated around at about 50 to 55knots on the 618 at
5200
to 5300 rpm, i found when desending at this rpm the aircraft picked
up
speed to about 60 to 65 knots and the altimeter stayed the same... i
was not loosing height. With a bit of practice it's easy to get the
plane on the 'step' sometimes without even thinking about it.

You can 'drag' the plane around the sky with high rpm which means
high
fuel burn or you can learn to use the step as part of normal flight
operations.

The easy way to pick the step is to line up the wing tips with the
horizon. If the leading edge is higher than the trailing edge then
your just poking around having fun.... push the stick forward slowly
or give it a touch of trim and she will pick up speed; the increased
speed creates extra lift which keeps you flying fast without loosing
height. Look to the wing tip on the step and the leading edge is
lower
than the trailing edge when lined up with the horizon.

This technique will take about an hour to master - learn it in still
weather otherwise the thermals etc will make it hard to learn.

The other reason my economy is down is my aircraft is geared to only
run to 6200 rpm instead of the max 6750 rpm, this gives me higher
gearing which equates to faster cruise speed for a lower rpm. If your
prop allows for advustment give it a go.

Thanks Michael