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CUSIP No.  75130P109                                  Page  1   of    11   pages
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                   Under the Securities Exchange Act of 1934*


                           RAM Energy Resources, Inc.
           (formerly known as Tremisis Energy Acquisition Corporation)
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    75130P109
--------------------------------------------------------------------------------
                                 (CUSIP Number)



                                  May 23, 2006
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [   ]  Rule 13d-1(b)

         [X  ]  Rule 13d-1(c)

         [   ]  Rule 13d-1(d)

*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 the
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 ("Act") 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).




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CUSIP No.  75130P109                                  Page  2   of    11   pages
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---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Rockbay Capital Management, LP
---------- ---------------------------------------------------------------------

2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                  (a) [ ]
                                                                  (b) [X]

---------- ---------------------------------------------------------------------
3          SEC USE ONLY

---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------------------------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,769,500
     OWNED BY        ------ ----------------------------------------------------
       EACH          7      SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                0
       WITH
                     ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,769,500
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,769,500
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.1%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IA
---------- ---------------------------------------------------------------------





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CUSIP No.  75130P109                                  Page  3   of    11   pages
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---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           RCM Advisors, LLC
---------- ---------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
3          SEC USE ONLY

---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
-------------------- ------ ----------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,769,500
     OWNED BY
                     ------ ----------------------------------------------------
       EACH          7      SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                0
       WITH          ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,769,500
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,769,500
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.1%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           PN
---------- ---------------------------------------------------------------------





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CUSIP No.  75130P109                                  Page  4   of    11   pages
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---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Atul Khanna
---------- ---------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
3          SEC USE ONLY

---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------------------------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,769,500
     OWNED BY
                     ------ ----------------------------------------------------
       EACH          7      SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                0
       WITH          ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,769,500
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,769,500
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.1%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------





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CUSIP No.  75130P109                                  Page  5   of    11   pages
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---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Jonathan Baron
---------- ---------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) [ ]
                                                                 (b) [X]

---------- ---------------------------------------------------------------------
3          SEC USE ONLY

---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------------------------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,769,500
     OWNED BY        ------ ----------------------------------------------------
       EACH          7      SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                0
       WITH          ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,769,500
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,769,500
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.1%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------






Item 1
         (a)    Name of Issuer

                RAM Energy Resources, Inc. (formerly known as Tremisis Energy
                Acquisition Corporation) (the "Company")

         (b):   Address of Issuer's Principal Executive Offices

                5100 E. Skelly Drive, Suite 650
                Tulsa, OK 74132

Item 2

         (a)    Name of Person Filing

                This statement is filed by the entities and persons listed
                below, who are collectively referred to herein as "Reporting
                Persons," with respect to shares of Common Stock (as defined
                in Item 2(d) below) of the Company (the "Shares"):

                Investment Manager
                ------------------

               (i)  Rockbay Capital Management, LP, a Delaware limited
                    partnership (the "Investment Manager"), with respect to the
                    Shares held by certain investment vehicles advised by the
                    Investment Manager (each a "Rockbay Fund").

               General Partner
               ---------------

               (ii) RCM Advisors, LLC, a Delaware limited liability company (the
                    "General Partner"), which serves as the general partner of
                    the Investment Manager, with respect to the Shares held by
                    each of the Rockbay Funds.

               Reporting Individuals
               ---------------------

               (iii) Mr. Atul Khanna ("Mr. Khanna"), a United States citizen,
                     with respect to the Shares held by each of the Rockbay
                     Funds.

               (iv)  Mr. Jonathan Baron ("Mr. Baron"), a United States citizen,
                     with respect to the Shares held by each of the Rockbay
                     Funds.

               Mr. Khanna and Mr. Baron are collectively referred to as the
               "Reporting Individuals."

               The Investment Manager serves as the investment manager to each
               of the Rockbay Funds. The General Partner serves as the general
               partner to the Investment Manager. Mr. Khanna is the Chief
               Executive Officer, and Mr. Baron is the Senior Managing Director,
               of the General Partner.

         (b)   Address of Principal Business Office or, if None, Residence

               The address of the principal business office of each of the
               Reporting Persons is:

               600 Fifth Avenue, 24th Floor
               New York, NY 10020


                                       6




         (c)   Citizenship

               Citizenship is set forth in Row 4 of the cover page for each
               Reporting Person hereto and is incorporated herein by
               reference for each such Reporting Person.

         (d)   Title of Class of Securities

               Common Stock, $0.0001 par value per share ("Common Stock")

         (e)   CUSIP Number

               75130P109

Item 3.  If this statement is filed pursuant to Sections 240.13d-1(b) or
         240.13d-2(b) or (c), check whether the person filing is a:

         (a) [ ] Broker or dealer registered under Section 15 of the Act.
         (b) [ ] Bank as defined in Section 3(a)(6) of the Act.
         (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act.
         (d) [ ] Investment Company registered under Section 8 of the
                 Investment Company Act of 1940.
         (e) [ ] Investment Adviser in accordance with Rule 13d-1 (b)(1)(ii)(E).
         (f) [ ] Employee Benefit Plan or Endowment Fund in accordance with
                 13d-1(b)(1)(ii)(F).
         (g) [ ] Parent Holding Company or control person in accordance with
                 Rule 13d-1 (b)(1)(ii)(G).
         (h) [ ] Savings Association as defined in Section 3(b) of the Federal
                 Deposit Insurance Act.
         (i) [ ] Church Plan that is excluded from the definition of an
                 investment company under Section 3(c)(14) of the Investment
                 Company Act of 1940.
         (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4.  Ownership

         The information required by Items 4(a) - (c) is set forth in Rows 5 -
         11 of the cover page for each Reporting Person hereto and is
         incorporated herein by reference for each such Reporting Person.

         The Investment Manager, as investment manager to each of the Rockbay
         Funds, may be deemed to be the beneficial owner of all such Shares
         owned by the Rockbay Funds. The General Partner, as general partner to
         the Investment Manager, may be deemed to be the beneficial owner of all
         Shares owned by the Rockbay Funds. Each of the Reporting Individuals,
         as an officer of the General Partner with the power to exercise
         investment discretion, may be deemed to be the beneficial owner of all
         Shares owned by the Rockbay Funds. Each of the Investment Manager, the
         General Partner, and the Reporting Individuals hereby disclaims any
         beneficial ownership of any such Shares.

Item 5.  Ownership of Five Percent or Less of a Class

         If this statement is being filed to report the fact that as of the date
         hereof the reporting person has ceased to be the beneficial owner of
         more than five percent of the class of securities, check the following:
         [ ]

Item 6.  Ownership of More than Five Percent on Behalf of Another Person

         Not applicable.

Item 7.  Identification and Classification of the Subsidiary Which Acquired the
         Security  Being Reported on by the Parent Holding Company

         Not applicable

                                       7




Item 8.  Identification and Classification of Members of the Group

         Not applicable

Item 9.  Notice of Dissolution of Group

         Not applicable

Item 10. Certification

         Each of the Reporting Persons hereby makes the following certification:

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were not acquired and are not
         held for the purpose of or with the effect of changing or influencing
         the control of the issuer of the securities and were not acquired and
         are not held in connection with or as a participant in any transaction
         having that purpose or effect.


                                       8





                                   SIGNATURES

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.

Dated: May 30, 2006

                                            ROCKBAY CAPITAL MANAGEMENT, LP
                                            By: RCM Advisors, LLC


                                            By: /s/ Atul Khanna
                                                --------------------------------
                                                 Atul Khanna
                                                 Chief Executive Officer


                                            RCM ADVISORS, LLC


                                            By: /s/ Atul Khanna
                                                --------------------------------
                                                 Atul Khanna
                                                 Chief Executive Officer



                                            /s/ Atul Khanna
                                            ------------------------------------
                                            Atul Khanna



                                            /s/ Jonathan Baron
                                            ------------------------------------
                                            Jonathan Baron


                                       9




                                  EXHIBIT INDEX

Exhibit 99.1     Joint Filing Agreement,  dated May 30, 2006, by and among
                 Rockbay Capital Management, LP, RCM Advisors, LLC, Atul Khanna,
                 and Jonathan Baron


                                       10