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                                 UNITED  STATES
                      SECURITIES  AND  EXCHANGE  COMMISSION
                            Washington,  D.C.  20549

                                 SCHEDULE  13D
                   Under  the  Securities  Exchange  Act  of  1934

SpaceDev,  Inc.
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                                (Name  of  Issuer)

$0.0001  par  value  common  stock
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                         (Title  of  Class  of  Securities)

846241  10  7
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                                 (CUSIP  Number)

Mark N. Sirangelo - 13855 Stowe Drive, Poway, California 92064 (858) 375-2000
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                 (Name,  Address  and  Telephone  Number  of  Person
               Authorized  to  Receive  Notices  and  Communications)

December 30, 2005
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             (Date  of  Event  which  Requires  Filing  of  This  Statement)

   If  the  filing  person  has  previously filed a statement on Schedule 13G to
   report  the  acquisition  that  is  the  subject of this Schedule 13D, and is
   filing  this  schedule  because  of  ss.  240.13d-1(e),  240.13d-1(f)  or
   240.13d-1(g),  check  the  following  box  [_].

   Note:  Schedules  filed  in  paper format shall include a signed original and
   five copies of the schedule, including all exhibits. See ss. 240.13d-7(b) for
   other  parties  to  whom  copies  are  to  be  sent.

   *  The  remainder  of  this  cover  page  shall be filled out for a reporting
   person's  initial  filing  on  this form with respect to the subject class of
   securities,  and  for  any  subsequent amendment containing information which
   would  alter  disclosures  provided  in  a  prior  cover  page.

   The  information  required  on  the remainder of this cover page shall not be
   deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
   Act  of  1934  or otherwise subject to the liabilities of that section of the
   Act but shall be subject to all other provisions of the Act (however, see the
   Notes).

                                      PAGE

CUSIP  No.  84621  10  7


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1.   Name  of  Reporting  Persons.
     I.R.S.  Identification  Nos.  of  above  persons  (entities  only).

Mark N. Sirangelo
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2.   Check  the  Appropriate  Box  If  a  Member  of  a Group (See Instructions)
     (a)  [_]
     (b)  [_]
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3.   SEC  Use  Only

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4.   Source  of  Funds  (See  Instructions)
PF
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5.   Check  If  Disclosure  of  Legal  Proceedings  Is  Required  Pursuant  to
     Items  2(d)  or  2(e)                                             [_]

--------------------------------------------------------------------------------
6.   Citizenship  or  Place  of  Organization
USA
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               7.   Sole  Voting  Power
  NUMBER  OF                0
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8.   Shared  Voting  Power
 OWNED  BY                  0
    EACH       -----------------------------------------------------------------
  REPORTING    9.   Sole  Dispositive  Power
   PERSON           1,900,000
    WITH       -----------------------------------------------------------------
               10.  Shared  Dispositive  Power
                            0
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11.  Aggregate  Amount  Beneficially  Owned  by  Each  Reporting  Person
1,900,000
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12.  Check  Box  If  the  Aggregate  Amount  in Row (11) Excludes Certain Shares
     (See  Instructions)                                               [_]
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13.  Percent  of  Class  Represented  by  Amount  in  Row  (11)
7.17%
--------------------------------------------------------------------------------
14.  Type  of  Reporting  Person  (See  Instructions)
IN
--------------------------------------------------------------------------------


                                      PAGE

ITEM  1.  SECURITY  AND  ISSUER

SpaceDev,  Inc.  ("SpaceDev")
Common  Stock,  $0.0001  par  value
13855  Stowe  Drive
Poway,  California  92064

ITEM  2.  IDENTITY  AND  BACKGROUND

     (a)  Mark N. Sirangelo

     (b)  13855  Stowe  Dr.  Poway,  CA.  92064

     (c)  Chief  Executive  Officer, Vice Chairman and Director of SpaceDev, the
     address  for  which  is  set  forth  above.

     (d)  N/A

     (e)  N/A

     (f)  U.S.  Citizen

ITEM  3.  SOURCE  AND  AMOUNT  OF  FUNDS  OR  OTHER  CONSIDERATION

     On  December  20, 2005, SpaceDev granted to Mr. Sirangelo vested options to
purchase  up  to an aggregate of 1,900,000 shares at a price of $1.40 per share.
These options were granted to Mr. Sirangelo in connection with his employment by
SpaceDev.  Subject  to certain limitations, the option may be exercised by means
of  a  net exercise provision by surrendering shares with a fair market value of
the  exercise  price  upon  exercise. Mr. Sirangelo has not exercised any of his
options  as  of  the  date  hereof.

ITEM  4.  PURPOSE  OF  TRANSACTION

     No  shares  have been purchased by Mr. Sirangelo. The options were acquired
by  Mr.  Sirangelo as part of his compensation in connection with his employment
by  SpaceDev.  Mr.  Sirangelo  does  not  have  any current or specific plans or
proposals  of the type required to be reported herein, although he may from time
to  time  be  involved  in developing or analyzing plans or proposals that could
affect SpaceDev in connection with the services he renders to SpaceDev as a part
of  his  employment.

ITEM  5.  INTEREST  IN  SECURITIES  OF  THE  ISSUER

     (a)  Mr. Sirangelo is deemed to be the beneficial owner of 1,900,000 shares
of  common  stock, or 7.17% of the outstanding shares, including the shares that
would  be outstanding if the shares that Mr. Sirangelo has the right to purchase
were actually outstanding. All of these shares are subject to options granted to
Mr. Sirangelo in connection with his employment by SpaceDev. Thus, of the shares
as  to  which  Mr. Sirangelo is deemed to be the beneficial owner, Mr. Sirangelo
has no sole or shared voting power, and Mr. Sirangelo has sole dispositive power
with  respect  to  all  1,900,000  shares.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES  OF  THE  ISSUER

Not  applicable.

ITEM  7.  MATERIAL  TO  BE  FILED  AS  EXHIBITS

None.

                                      PAGE


                                    SIGNATURE

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that  the information set forth in this statement is true, complete and correct.

                                                               December 30, 2005
                                                              ------------------
                                                                            Date

                                                         /s/  Mark N. Sirangelo
                                                   -----------------------------
                                                                       Signature
                                                               Mark N. Sirangelo
                                             -----------------------------------
                                                                      Name/Title


ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR  OMISSIONS OF FACT CONSTITUTE FEDERAL
CRIMINAL  VIOLATIONS  (SEE  18  U.S.C.  1001)