November 22, 2010

SECURITIES & EXCHANGE COMMISSION
450 Fifth Street, NW
Washington, DC 20549

Attn.: Document Control

RE:	American Depositary Receipts representing
one hundred sixty deposited shares of
 Orbital Corporation Limited
(Form F-6, Registration No.  333-13466)


Ladies and Gentlemen:

Pursuant to Rule 424(b)(3) under the Securities Act
of 1933, as amended, on behalf of The Bank of
New York Mellon, as Depositary for securities
against which American Depositary Receipts are to
be issued, we attach a copy of the new prospectus
(Prospectus) reflecting the change in  number of
ordinary shares represented by one American
Depositary Share (the Ratio).

As required by Rule 424(e), the upper right hand
corner of the Prospectus cover page has a reference
to Rule 424(b)(3) and to the file number of the
registration statement to which the Prospectus
relates.

Pursuant to Section III B of the General Instructions
to the Form F-6 Registration Statement, the
Prospectus consists of the ADR certificate with the
revised ratio for Orbital Corporation Limited.

The Prospectus has been revised to reflect the new
ratio, and has been overstamped with:

Effective November 22, 2010 the ratio has
changed to One (1) American Depositary Share
represents Sixteen (16) deposited Shares.

Please contact me with any questions or comments
at 212 815-2729

Mark Gendler
Senior Associate
The Bank of New York Mellon - ADR Division


Encl.
CC: Paul Dudek, Esq. (Office of International
Corporate Finance)