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                                                                    EXHIBIT 31.1


                  CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

                            Section 302 Certification

I,  Mark  N.  Sirangelo,  certify  that:

     1.     I have reviewed this annual report on Form 10-KSB of SpaceDev, Inc.,
a  Colorado  corporation;

     2.     Based  on  my  knowledge,  this  report  does not contain any untrue
statement of a material fact or omit to state a material fact necessary in order
to  make  the  statements  made,  in light of the circumstances under which such
statements  were made, not misleading with respect to the period covered by this
report;

     3.     Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial  condition, results of operations and cash flows of the small business
issuer  as  of,  and  for,  the  periods  presented  in  this  report;

     4.     The  small  business  issuer's other certifying officer(s) and I are
responsible  for establishing and maintaining disclosure controls and procedures
(as  defined  in  Exchange  Act  Rules  13a-15(e)  and  15d-15(e)) for the small
business  issuer  and  have:

     (a)     designed  such  disclosure  controls and procedures, or caused such
disclosure  controls  and  procedures  to  be designed under our supervision, to
ensure  that  material  information  relating  to  the  small  business  issuer,
including  its  consolidated  subsidiaries, is made known to us by others within
those  entities,  particularly  during  the period in which this report is being
prepared;

(b)     evaluated  the effectiveness of the registrant's disclosure controls and
procedures  and presented in this report our conclusions about the effectiveness
of  the  disclosure controls and procedures, as of the end of the period covered
by  this  report  based  on  such  evaluation;  and,

(c)     disclosed  in  this  report  any  change  in the small business issuer's
internal  control  over  financial  reporting  that  occurred  during  the small
business issuer's most recent fiscal quarter (the small business issuer's fourth
fiscal quarter in the case of an annual report) that has materially affected, or
is  reasonably likely to materially affect, the small business issuer's internal
control  over  financial  reporting;  and,

     5.     The  small  business issuer's other certifying officer(s) and I have
disclosed,  based  on  our  most  recent  evaluation  of  internal  control over
financial  reporting,  to  the  small  business  issuer's auditors and the audit
committee  of  the  small  business  issuer's  board  of  directors  (or persons
performing  the  equivalent  functions):

     (a)     all  significant deficiencies and material weaknesses in the design
or  operation  of internal control over financial reporting which are reasonably
likely  to  adversely  affect  the  small  business  issuer's ability to record,
process,  summarize  and  report  financial  information;  and,

     (b)     any  fraud,  whether  or  not material, that involves management or
other  employees  who  have  a  significant  role in the small business issuer's
internal  control  over  financial  reporting.
Date:  March  28,  2006
                                   /s/  Mark  N.  Sirangelo
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                                   Mark  N.  Sirangelo
                                   Chief  Executive  Officer