Exhibit 12.1

CERTIFICATION

I, Tor Olav Troim, certify that:

1.      I have  reviewed  this annual  report on Form 20-F of  CalPetro  Tankers
        (Isle of Man) Limited;

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 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 registrant as of, and for, the periods presented in this report;

4.      The  registrant's  other  certifying  officer 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
        registrant 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
               registrant,  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 registrant's  internal
               control over financial  reporting that occurred during the period
               covered by the annual report that has materially affected,  or is
               reasonably likely to materially affect, the registrant's internal
               control over financial reporting; and

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

          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 registrant's
               ability  to  record,  process,  summarise  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  registrant's
               internal control over financial reporting.

Date: June 30, 2006

/s/ Tor Olav Troim

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Tor Olav Troim
President