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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 -----

From: Jonathan Webb

To: [email protected]

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@...

-- 
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
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