Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
CHURCH DALE W
  2. Issuer Name and Ticker or Trading Symbol
MECHANICAL TECHNOLOGY INC [MKTY]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
9 FRANKLIN STREET
3. Date of Earliest Transaction (Month/Day/Year)
04/05/2006
(Street)

ALEXANDRIA, VA 22314
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 04/05/2006   M(1)   3,000 A $ 2.8 117,764 D  
Common Stock 04/05/2006   S(1)   3,000 D $ 4 114,764 D  
Common Stock 04/05/2006   M(1)   5,000 A $ 3.42 119,764 D  
Common Stock 04/05/2006   S(1)   5,000 D $ 4 114,764 D  
Common Stock 04/05/2006   S(1)   50,000 (2) D $ 4 64,764 D  
Common Stock               2,250 I By Spouse

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
BOD 6/19/03 Stock Options (Rights to Buy) $ 2.8 04/05/2006   M(1)     3,000 06/19/2003(3) 06/18/2013 Common Stock 3,000 $ 2.8 0 D  
Employee Stock Option (Rights to Buy) $ 3.42 04/05/2006   M(1)     5,000 (2) 04/01/2002(3) 03/31/2012 Common Stock 5,000 $ 3.42 20,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
CHURCH DALE W
9 FRANKLIN STREET
ALEXANDRIA, VA 22314
  X      

Signatures

 By: Cynthia A. Scheuer as Attorney in Fact for   04/06/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The exercise of options and sales of common stock reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 28, 2006.
(2) As of April 5, 2006, Mr. Church, who is the only member of the Company's Board of Directors with an active 10b5-1 plan, owns 64,764 shares of common stock and has 150,000 vested options outstanding and exercisable after the transactions reported in this Form 4. Mr. Church also has 66,250 unvested options outstanding which are not expected to vest before his board term expires on May 18, 2006.
(3) Immediately Vested

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