Early ST 51's to decide what year of manufacture.

[Allen Brickhaus]

When were these produced?  The one with the slick side had the V and other lettering but it has been removed.

[RandySmith]

They go back to the late  1960s

Randy

[Allen Brickhaus]

Thank you,

Allen

[RandySmith]

They made  both ball bearing models and plain bushing models of the 51, Also the later ones had muffler lugs and thicker cylinder sleeves

Randy

[Brian Hampton]

I have a test report from 1974 on what seems to be your engine at http://sceptreflight.net/Model%20Engine%20Tests/ST%2051%20%281974%29.html where it says the plain bearing version was from 1960.

[M Spencer]

These old plain bearing 51s are from around 1960 .



Piston / Liners same part No as Ball Race , which I think came out around 62 with the 56 , then the 60 around 1964 .
Was two ring & single ring , Two Ring being first series . Head chambers altered over the years , or Chantis too .

[M Spencer]

Egad !  



wrong box tho , & a few other things , http://www.ebay.com/itm/VINTAGE-SUPER-TIGRE-V-51-Chromed-RC-Model-Airplane-Engine-Saturno-ITALY-51-AAA-/171060340994#ht_1745wt_1141

Triple AAA is about 64 / 65 .  

[M Spencer]

More diatribe , from :http://sceptreflight.net/Model%20Engine%20Tests/ST%2051%20(1974).html

First Line says ' since its appearance in 1960 ! so may well be first made in 1960 . !

[Allen Brickhaus]

You have been a big help to me.  Thank you so much.

Allen

[Chris McMillin]

I like the reference to "contest R/C stunt" events.
Chris...