Document:

FIFTHCAI INC
                          4300 N. MILLER RD. SUITE 120
                         SCOTTSDALE, ARIZONA 85251-3620

February4, 2000

Carl P. Ranno Esq.
2816 East Windrose Drive
Phoenix, Arizona 85032

    Re: Lock-Up Agreement with Fifthcai, Inc.

Gentlemen,

     In consideration of the sale to the holder by Fifthcai,  Inc., (Company) of
its Common Stock ($.0001 par value), the undersigned holder warrants,  covenants
and agrees for the benefit of the Company not to sell, offer to sell, solicit an
offer to buy, contract to sell, make any short sale,  pledge,  grant,  grant any
option to purchase,  or  otherwise  transfer or dispose of, any shares of Common
stock, or any securities  convertible  into or exercisable or  exchangeable  for
Common Stock,  owned directly or beneficially by the undersigned or with respect
to which the undersigned has the power of disposition, except in connection with
or following a completed merger or acquisition by the Company and the Company is
no longer  classified as a blank check company  pursuant to Section 7 (b) (3) of
the Securities Act of 1933, as amended.

     An attempt to sell, transfer or any type of disposition of the shares shall
be a violation of this letter  agreement and shall be  ineffective  and null and
void.

     In  furtherance  of the  foregoing,  the holder agrees to; (1) delivery his
shares to the  Company  for safe  keeping;  (2) allow the  Company to advise its
Transfer Agent not to transfer said  securities and (3) authorize the company to
deliver a copy of this  Agreement to the  transfer  agent with  instructions  to
decline to make any transfer of securities if such transfer  would  constitute a
violation or breach of this Agreement.

     This  Agreement  shall be  binding  upon the  holder,  its  agents,  heirs,
successors, assignees and beneficiaries.
<PAGE>
     A waiver of the terms and  conditions of this  agreement must be in writing
and executed by the proper officer of the Company and the holder.

     If there is a breach or  threatened  breach of this  Agreement,  the holder
agrees  that  there is no  adequate  remedy at law and said  breach  will  cause
irreparable damage. Accordingly,  the holder agrees that the Company is entitled
to the issuance of an immediate injunction without notice to restrain the breach
or  threatened  breach.  This remedy is not exclusive and the holder agrees that
the  Company  and third  party  beneficiaries  shall be  entitled  to seek other
remedies including a claim for other remedies, including money damages.

THE HOLDER

/s/ Carl P. Ranno
--------------------------
Carl P. Ranno.                         Constituting 10,000 shares certificate(s)

                                                             #__________________FIFTHCAI INC
                          4300 N. MILLER RD. SUITE 120
                         SCOTTSDALE, ARIZONA 85251-3620

February 1, 2000
Kenneth R. Lew
4300 North Miller Rd. Suite 120
Scottsdale, Arizona 85251

     Re: Lock-Up Agreement with Fifthcai, Inc.

Gentlemen,

     In consideration of the sale to the holder by Fifthcai,  Inc., (Company) of
its Common Stock ($.0001 par value), the undersigned holder warrants,  covenants
and agrees for the benefit of the Company not to sell, offer to sell, solicit an
offer to buy, contract to sell, make any short sale,  pledge,  grant,  grant any
option to purchase,  or  otherwise  transfer or dispose of, any shares of Common
stock, or any securities  convertible  into or exercisable or  exchangeable  for
Common Stock,  owned directly or beneficially by the undersigned or with respect
to which the undersigned has the power of disposition, except in connection with
or following a completed merger or acquisition by the Company and the Company is
no longer  classified as a blank check company  pursuant to Section 7 (b) (3) of
the Securities Act of 1933, as amended.

     An attempt to sell, transfer or any type of disposition of the shares shall
be a violation of this letter  agreement and shall be  ineffective  and null and
void.

     In  furtherance  of the  foregoing,  the holder agrees to; (1) delivery his
shares to the  Company  for safe  keeping;  (2) allow the  Company to advise its
Transfer Agent not to transfer said  securities and (3) authorize the company to
deliver a copy of this  Agreement to the  transfer  agent with  instructions  to
decline to make any transfer of securities if such transfer  would  constitute a
violation or breach of this Agreement.

     This  Agreement  shall be  binding  upon the  holder,  its  agents,  heirs,
successors, assignees and beneficiaries.
<PAGE>
     A waiver of the terms and  conditions of this  agreement must be in writing
and executed by the proper officer of the Company and the holder.

     If there is a breach or  threatened  breach of this  Agreement,  the holder
agrees  that  there is no  adequate  remedy at law and said  breach  will  cause
irreparable damage. Accordingly,  the holder agrees that the Company is entitled
to the issuance of an immediate injunction without notice to restrain the breach
or  threatened  breach.  This remedy is not exclusive and the holder agrees that
the  Company  and third  party  beneficiaries  shall be  entitled  to seek other
remedies including a claim for other remedies, including money damages.

THE HOLDER

/s/ Kenneth R. Lew
--------------------------
Kenneth R. Lew                         Constituting 30,000 shares certificate(s)

                                                             #__________________<PAGE>   1
                                                                     EXHIBIT 4.1

COMMON STOCK                                                        COMMON STOCK

CT                    [CAPSTONE TURBINE CORPORATION LOGO]

                          CAPSTONE TURBINE CORPORATION

INCORPORATED UNDER THE LAWS                  SEE REVERSE FOR CERTAIN DEFINITIONS
 OF THE STATE OF DELAWARE
                                                      CUSIP 14067D 10 2

This Certifies that

is the record holder of

   FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $.001 PAR VALUE, OF

                          CAPSTONE TURBINE CORPORATION

transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate is not valid until countersigned and registered by
the Transfer Agent and Registrar.
     IN WITNESS WHEREOF the Corporation has caused this Certificate to be
signed in facsimile by its duly authorized officers and a facsimile of its
corporate seal.

Dated:

/s/ JEFFREY R. WATTS                                   /s/ AKE ALMGREN
-------------------------                              -------------------------
        SECRETARY                                              PRESIDENT

                      [CAPSTONE TURBINE CORPORATION SEAL]

<PAGE>   2

     The Corporation will furnish without charge to each stockholder who so
requests the powers, designations, preferences and relative, participating,
optional, or other special rights of each class of stock or series thereof and
the qualifications, limitations or restrictions of such preferences and/or
rights. Such requests shall be made to the Corporation's Secretary at the
principal office of the Corporation.

     KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN OR DESTROYED,
THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE
OF A REPLACEMENT CERTIFICATE.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or requisitions:

     TEN COM - as tenants in common
     TEN ENT - as tenants by the entireties
     JT TEN  - as joint tenants with right of
               survivorship and in not as tenants
               in common

     UNIF GIFT MIN ACT -__________________Custodian____________________
                              (Cust)                      (Minor)
                        under Uniform Gifts to Minors
                        Act____________________________________________
                                             (State)
     UNIF TRF MIN ACT - __________________Custodian (until age_________)
                              (Cust)
                        ________________________under Uniform Transfers
                               (Minor)
                        to Minors Act__________________________________
                                                (State)

    Additional abbreviations may also be used though not in the above list.

   FOR VALUE RECEIVED, __________________ hereby sell, assign and transfer unto

   PLEASE INSERT SOCIAL SECURITY OR OTHER
       IDENTIFYING NUMBER OF ASSIGNEE
   ______________________________________
  |                                      |
  |______________________________________|

  _____________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE)

  _____________________________________________________________________________

  _____________________________________________________________________________

  _______________________________________________________________________Shares
  of the common stock represented by the within Certificate, and do hereby
  irrevocably constitute and appoint

  _____________________________________________________________________Attorney
  to transfer the said stock on the books of the within named Corporation with
  full power of substitution in the premises.

  Dated________________________________

                                       X______________________________________

                                       X______________________________________
                                NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST
                                        CORRESPOND WITH THE NAME(S) AS WRITTEN
                                        UPON THE FACE OF THE CERTIFICATE IN
                                        EVERY PARTICULAR, WITHOUT ALTERATION OR
                                        ENLARGEMENT OR ANY CHANGE WHATEVER.

Signature(s) Guaranteed

By________________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE
GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS
AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-16.

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