Editing Gyroscope (section)

=== DTG ===
A dynamically tuned gyroscope (DTG) is a rotor suspended by a universal joint with flexure pivots.<ref>{{cite journal
 |url=http://spiedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PSISDG003692000001000101000001&idtype=cvips&gifs=yes&ref=no 
 |title=Modeling the dynamically tuned gyroscope in support of high-bandwidth capture loop design 
 |author=David May 
 |editor2-first=Larry A 
 |editor2-last=Stockum 
 |editor1-first=Michael K 
 |editor1-last=Masten 
 |journal=Proc. SPIE 
 |series=Acquisition, Tracking, and Pointing XIII 
 |volume=3692 
 |year=1999 
 |doi=10.1117/12.352852 
 |pages=101–111 
|bibcode=1999SPIE.3692..101M 
 |s2cid=121290096 
 |url-access=subscription 
 }}{{dead link|date=June 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> The flexure spring stiffness is independent of spin rate. However, the dynamic inertia (from the gyroscopic reaction effect) from the gimbal provides negative spring stiffness proportional to the square of the spin speed (Howe and Savet, 1964; Lawrence, 1998). Therefore, at a particular speed, called the tuning speed, the two moments cancel each other, freeing the rotor from torque, a necessary condition for an ideal gyroscope.