"CASA is responding to a high, and increasing, rate of engine failures
among aircraft that are powered by engines manufactured by, or under
licence from, Jabiru Aircraft Pty Ltd (Jabiru). Such aircraft are
referred to in this document as 'Jabiru powered aircraft'.

The issues appear to be the result of several failure modes, which
require separate investigation.

CASA has formed the view that its functions under the /Civil Aviation
Act 1988/ require it to mitigate certain risks to passengers, trainee
pilots and persons on the ground.

Accordingly, while CASA works with Jabiru to identify the causes of
these engine failures and to implement appropriate corrective actions,
CASA proposes a set of operating limitations on Jabiru powered aircraft."

https://www.casa.gov.au/standard-page/consultation-draft-%E2%80%93-cd1425ss-0?WCMS%3ASTANDARD%3A%3Apc=PC_102279

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Time for an all aluminium  one rotor In Australia.

The Jabriu was based on the VW crank, rods and pistons I suspect.
There is not enough cylinder to cylinder spacing on a VW
to get adequate cooling fins on the heads.

I also suspect the through bolts are resonating.

The Australian aviation magazines are filled with
Jabriu products for sale.

Paul Lamar

Hi Paul, hope Robin is feeling better.  The VW head might have been ok at 25
to 36 hp with forced air cooling but it has more problems than bore spacing;
because of port layout and keeping engine width and valve length down there
is very little fining and airflow area over the top of the combustion
chamber so the heads run hot and the CR must be kept low and the engines run
rich so they don't blow up so the efficiency is poor. For a late 1930's
engine it is ok but today?

Murry Rozansky


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