< IMGsrc=" http://www.flightjournal.com/articles/su27/twin_Su-7.jpg" >
Your html was close. If you lose the space between the left caret and IMG, insert a space between IMG and src and then lose the space between the right quote and the right carat, all works well, as shown below.
Try one more time. Cut and paste this:
<IMG src=" http://www.flightjournal.com/articles/su27/twin_Su-7.jpg">