SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549


                                 FORM 8-K


                              CURRENT REPORT
              Pursuant to Section 13 or 15(d) of the Securities
                           Exchange Act of 1934


    Date of Report (Date of earliest event reported): April 7, 2005


                            SONEX RESEARCH, INC.
              (Exact name of registrant as specified in Charter)


         Maryland                  000-14465              52-1188993
      (State or other           (Commision file         (IRS employer
      jurisdiction of               number)           identification no.)
       incorporation)


                     23 Hudson Street, Annapolis, MD 21401
                    (Address of principal executive offices)


                              (410) 266-5556
             (Registrant's telephone number, including area code)


                                    N/A
         (Former name or former address, if changed since last report)



Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following   provisions  (see  General  Instruction  A.2.  below):

[ ]  Written communications  pursuant to Rule 425 under the Securities Act
     (17 CFR 230.425)
[ ]  Soliciting  material  pursuant to Rule 14a-12  under the Exchange Act
     (17 CFR 240.14a-12)
[ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange  Act (17 CFR  240.14d-2(b))
[ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))






ITEM 8.01 - OTHER EVENTS

On April 7, 2005,  the  Registrant  posted  the  following  announcement  on its
website (www.sonexresearch.com):



                      SONEX WON'T FILE FORM 10-KSB ON TIME,
                           BUT CEO REMAINS OPTIMISTIC


ANNAPOLIS,  MARYLAND,  April 7, 2005 - SONEX  RESEARCH,  INC. (OTC BB: SONX),  a
leader in the field of combustion  technology,  last week filed for an automatic
extension of time to submit its Annual  Report on Form 10-KSB for the year ended
December 31, 2004.  The date for filing the Form 10-KSB with the  Securities and
Exchange Commission (SEC), originally March 31, 2005, is now April 15, 2005, but
the Company now reports  that it will not make the filing by this  extended  due
date.

In  addition,  Dr.  Andrew A.  Pouring,  Sonex  Chairman  of the Board,  CEO and
President,  reports that the Company has substantially  completed work under its
ongoing  agreement with the Defense Advanced Research Projects Agency (DARPA) on
a  project  to  develop a "heavy  fuel"  engine  (HFE)  combustion  process  for
potential  Department  of Defense  (DoD)  applications  such as unmanned  aerial
vehicles  (UAVs).  He explained  that Sonex has  demonstrated  the potential for
lightweight,  multi-cylinder  engines running on JP-5,  military  kerosene-based
heavy fuel by application of a Sonex Combustion System (SCS) unthrottled, direct
fuel injection  combustion  process based on the Sonex Controlled  Auto-Ignition
(SCAI)  technology.  The SCAI process is enabled by a  proprietary  Sonex piston
technology that achieves in-cylinder chemical kinetics at a moderate compression
ratio for auto ignition of the JP-5 to achieve engine stability and control, and
fuel consumption substantially lower than a gasoline baseline engine.

Dr.  Pouring  suggested  that outcomes from the DARPA program could validate the
sparkless  SCAI process for  in-cylinder  control of ignition and combustion for
potential  application  to gasoline  powered  automobiles to achieve better fuel
economy.  He added that the Company  hopes to be in a position to announce  more
specific project results in the near future following acceptance by DARPA of the
Company's project report.

In its SEC filing  for the  extension  of time to submit  the 2004 Form  10-KSB,
Sonex  explained  that it did not  have  the  funds to  engage  its  independent
accountants to conduct the audit of the December 31, 2004 financial  statements,
and  that its  limited  staff  did not  have  time to  prepare  the Form  10-KSB
document.  The Company had also  cautioned that it might not be in a position to
file the Form 10-KSB by the extended due date, but it now indicates that it will
not make the filing by April 15, 2005.

Sonex CFO,  Secretary and board member George E. Ponticas  reports that the time
spent this year by Dr. Pouring and he dealing with an investor lawsuit,  and the
legal fees required, were among the factors resulting in the Company's inability
to prepare  and file the Form  10-KSB.  He added  that  failure to file the Form
10-KSB  by the  extended  due  date may have  significant  implications  for the
Company until the filing is made, including the inability to register stock with
the SEC and inability for shareholders to sell restricted stock.  Sonex will use
its best efforts to file the report as soon as resources permit.

While the Company  continues  to  experience  cash flow  problems,  Dr.  Pouring
expressed optimism that revenue from the DARPA agreement,  the modest amounts of
revenue  being  earned  from  work on  HFEs  for  small  UAV  applications,  and
additional  short-term  loans from  shareholders  will provide Sonex the time to
secure needed additional capital and/or revenue, and hire sufficient experienced
personnel,  to take advantage of a number of potential  business  opportunities.
There is no assurance,  however,  that the Company will be able to achieve these
objectives.  The Company's  history of operating losses,  significant  financial
liabilities,  and other risk factors mean that there still  remains  substantial
doubt about the Company's ability to continue as a going concern.



SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


April 7, 2005

SONEX RESEARCH, INC.
Registrant



/s/ George E. Ponticas
----------------------
George E. Ponticas
Chief Financial Officer and Secretary