content: 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
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text: 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