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 23, 2003


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


         Maryland                  0-14465                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)

















ITEM 5. - OTHER EVENTS AND REGULATION FD DISCLOSURE

On April 23, 2003, Sonex Research, Inc. (the "Company") posted the following
update to shareholders on its website (www.sonexresearch.com):



				  SONEX UPDATE - APRIL 23, 2003


Dear Fellow Shareholders:

Last week Sonex filed its  December  31, 2002 Annual  Report on Form 10-KSB with
the SEC.  This report  provides a  comprehensive,  up-to-date  discussion of the
Company's  initiatives and includes complete audited financial  statements.  The
Form  10-KSB  will be mailed to  shareholders  later  this year along with other
proxy  information in connection  with our 2003 Annual Meeting of  Shareholders.
The date for the shareholder meeting will be determined in the near future.

The complete  Annual Report on Form 10-KSB as filed with the SEC is available at
http://www.sec.gov/Archives/edgar/data/723312/000072331203000003/r10ksb02.txt.
This version is in plain text format and does not contain most standard document
formatting  features.  You can request a formatted  version from Sonex directly,
either in electronic format or in hard copy.

You will read in the Annual Report on Form 10-KSB that Sonex  reported  revenues
for 2002 of $471,912,  up from $245,291 in 2001, as the Company  received  three
major  contracts  and  subcontracts  from  branches of the U.S.  government  and
military or their prime  contractors  during the second half of 2002; there were
no revenues in 2002 from commercial contracts. The increase in revenues combined
with a decrease in total  expenses led to a decline in the net loss,  which fell
to $321,640 in 2002 from $690,355 in 200 1, a reduction of 53%.

The new contracts and  subcontracts,  as described in brief below,  provided the
cash  needed  to  fund  the  majority  of the  Company's  operating  expenditure
requirements  for  2002.  Expenditures  were  kept to a  minimum  through  staff
reductions  early in the year and the  continued  deferral  of  compensation  by
officers and key  consultants.  In the second half of 2002 the Company  expanded
its staff to handle  the work  brought on by the new  funded  programs.  In 2003
revenues from these continuing  projects and anticipated new contracts are again
expected,  although  there  can be no  assurance,  to  provide  most of the cash
necessary to fund operations for the year. As of March 31, 2003, the Company had
approximately $110,000 cash and accounts receivable of approximately $95,000.

The Company's three ongoing funded programs are as follows.

In the fourth quarter of 2002 the Company was awarded a $744,246 contract by the
Defense  Advanced  Research  Projects  Agency  (DARPA)  to begin the  design and
development of a heavy fuel conversion process for a gasoline  automotive engine
for potential use in a developmental  unmanned aerial vehicle (UAV). The primary
objective of this program is to transfer the SCS SCRI heavy fuel design achieved
in  the  Sonex  single-cylinder  laboratory  engine  to a  modern  six-cylinder,
gasoline automotive engine, eliminate the spark ignition system, and produce the
same power the engine originally  produced on gasoline.  As of March 2003, Sonex
has  completed a design  review with DARPA and is  progressing  to engineer  the
hardware for the SCS conversion.  Suppliers have been engaged and are responsive
to this  project.  Completion  of this project is expected in late 2003 or early
2004.

In the fourth  quarter of 2002 the Company  received a subcontract  from Compact
Membrane  Systems,  Inc.  (CMS) for $458,862,  of which  $100,000 is cost-shared
(funded) by Sonex.  CMS is a prime  contractor  for a U.S.  Department of Energy
(DOE),  Small Business  Innovation  Research (SBIR)  Program,  Phase II project.
Sonex and CMS are evaluating the diesel engine emissions  reduction potential of
combining the patented piston-based, SCS technology and the CMS polymer membrane
technology  for the  addition of nitrogen e nriched air (NEA) to the  combustion
process.  Last week  Sonex  announced  it had  recently  taken  delivery  of the
advanced  research  automotive  diesel  engine to be used for the  testing.  The
engine,  which is DOE property,  is a state-of-the-art,  three-cylinder,  direct
injected,   turbo-charged,   automotive  diesel  engine  developed  by  a  major
international  vehicle  manufacturer in the joint U.S. government and automotive
industry funded PNGV (Partnership for a New Generation Vehicle) program.

Early  stages of the Phase II  project  will  focus on the  emissions  reduction
capabilities  of  the  SCS  pistons  separately,  while  subsequent  testing  in
combination   with  the  NEA  membrane  will   demonstrate   the  viability  for
commercialization  of the synergy of SCS  configurations  and the CMS membranes.
This  program  would  provide  SCS  in-cylinder  emissions  reduction  data on a
multi-cylinder  diesel  engine as a means for  diesel  engine  manufacturers  to
evaluate the potential for SCS designs,  alone and in combination  wit h the NEA
membrane,  to reduce the cost and  complexity of future  exhaust  aftertreatment
systems.  While the entire  project is not expected to be completed  until 2004,
testing results on the SCS pistons alone may be available later this year.

In the third  quarter  of 2002 the  Company  received a  subcontract,  initially
funded for $200,000 and later increased to $281,947,  from Science  Applications
International   Corporation   (SAIC),   a  large  Department  of  Defense  prime
contractor.  Sonex was  tasked to  conduct  a survey of  commercially  available
two-stroke,  spark ignited, gasoline engines of approximately 72 horsepower and,
jointly with SAIC, select a candidate engine for a "best efforts" SCS conversion
to start and operate on heavy fuels for use in a U AV weapon  system.  SAIC also
awarded a subcontract to a competing firm to develop a heavy fuel conversion for
a  rotary  engine  already  in  production.   SAIC  and  its  military   sponsor
subsequently  increased the targeted  horsepower  requirement  to 100. Sonex and
SAIC together selected a candidate gasoline engine,  not yet in production,  for
conversion to heavy fuel. Due to  deficiencies  found in operating the candidate
engine on gasoline and concurrent fuel consumption  problems  experienced by the
competing rotar y engine  operating on heavy fuel, the military sponsor recently
expressed a desire to have Sonex work with the competing rotary engine developer
to focus on improving the fuel consumption of the rotary heavy fuel engine. This
joint effort is expected to be formalized during the second quarter of 2003.

In 2003  Sonex is  pursuing a number of  business  development,  marketing,  and
financing  initiatives.  Development  efforts  taking  place  under the  current
government contracts could facilitate participation by the engine and automotive
industries and thereby  accelerate  commercialization  potential of the patented
SCS technology.  In particular,  outcomes from the DARPA program should validate
the SCS SCRI technology for in-cylinder  control of ignition and combustion that
could be applied later to a gasoline power ed version.

Sonex will keep you informed of new  developments in these ongoing  projects and
others the Company is pursuing.  Management  looks forward to seeing many of you
again at the 2003 Annual Meeting of Shareholders later this year.


Sincerely,


Andrew A. Pouring, D.Eng.
Chief Executive Officer
Sonex Research, Inc.


ABOUT SONEX

Sonex  Research,  Inc.,  a leader  in the  field of  combustion  technology,  is
developing its patented Sonex Combustion  System (SCS)  piston-based  technology
for in-cylinder  control of ignition and  combustion,  designed to increase fuel
mileage and reduce  emissions  of internal  combustion  engines.  Sonex plans to
complete development, commercialize and market its SCS Stratified Charge Radical
Ignition  (SCRI)  combustion  process to the automotive  industry in response to
forthcoming  increases in national  vehicle fuel mileage  standards.  Presently,
high mileage, roomy and safe five-passenger  automobiles using gasoline,  direct
injected (GDI) engines are sold only in Japan and Europe due to high  emissions.
Sonex intends to conclusively  demonstrate that SCS-SCRI will enable GDI engined
vehicles to achieve 50 mpg (highway) while meeting emissions standards to permit
sale in the U.S. as a viable,  near-term  alternative to  longer-term  solutions
such as  improvements  in hybrid  propulsion  systems  or years of  further  R&D
required for fuel cell technology to become practical.

Additionally, independent third-party testing has confirmed the potential of the
SCS application for DI diesel engines to reduce harmful soot in-cylinder without
increasing   fuel   consumption.   Sonex  is  pursuing   joint   marketing   and
commercialization  programs  for the  SCS low  soot  technology  with  committed
industrial partners.

Other SCS designs are being used to convert gasoline engines of various sizes to
operate on safer,  diesel-type  "heavy fuels" for use in military and commercial
applications  requiring  light  weight and safe  handling  and  storage of fuel.
Examples include UAVs (unmanned aerial vehicles) and ATVs (all-terrain vehicles)
such as those used by U.S.  defense forces in  Afghanistan,  as well as outboard
engines, small watercraft used as targets, and generator sets.


CAUTION REGARDING FORWARD-LOOKING STATEMENTS

"Forward-looking"  statements  contained  in this  announcement,  as well as all
publicly disseminated material about the Company, are made pursuant to the "safe
harbor" provisions of the Private Securities Litigation Act. Such statements are
based  on  current  expectations,  estimates,  projections  and  assumptions  by
management  with respect to matters  such as  commercial  acceptance  of the SCS
technology, the impact of competition,  and the Company's financial condition or
results of  operations.  Readers  are  cautioned  that such  statements  are not
guarantees of future  performance and involve risks and uncertainties that could
cause  actual  results to differ  materially  from those  expressed  in any such
forward-looking statements.  Additional information regarding the risks faced by
Sonex is provided in the  Company's  periodic  filings with the  Securities  and
Exchange Commission under the heading "Risk Factors". Such filings are available
upon request from the Company or online in the EDGAR database at www.sec.gov.


                                 ###



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 23, 2003

SONEX RESEARCH, INC.
Registrant

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