Blast = 50% Nitro.
Blast was great stuff. I used the very last can of it in existence at Fox Mfg during the summer of 1970. (I would save it, and use it sparingly, for a timed run.)
Also in the early 1970s Fox Mfg released "Fox 40-40". I think I recall it was 40% nitro, 40% methanol, and 20% oil. It was "legal" for FAI as I recall. It was pretty darn good fuel. I burned a lot of 40-40 during that time.
However, my sentimental favorite is good old "Missile Mist". As a kid I loved the name, loved the purple can, loved the mysterious* purple color, and as I recall, Riley won a National using a Missile Mist powered 36XBB... that was good enough for me!
* That purple color: Upon hiring out at Fox, imagine my disappointment to learn that the purple color was nothing more than dark indigo dye, and had NOTHING to do with what surely must be "secret ingredients" as I supposed. In fact, it wasn't even added for "pizazz". Nope, it was added so it would be easy to tell it apart from Fox Superfuel there at the plant! FWIW: We used Missile Mist as run-in fuel in ALL engines, even Stunt 35's!
A "Blast" legend.
(Disclaimer: This alleged incident was NOT told to me by Duke.)
When Duke introduced "Blast" (early 1960s, I think?), his combat series of engines were about the only engines capable of using it without undue wear/damage. Story goes that the Fox rep at the time went about the combat practice circles at a particular National, offering free (1/2 pint?) sample cans of "Blast". Yup, it was a "Blast" alright... several of the chaps blew rods and even cases in their Torps, Johnson's, etc. That's one way to tilt the odds of getting a Fox powered winner! If I'm not mistaken, this alleged incident was the origin of Larry Scrarinzi's "Blast Trophy" that he presented to Duke that contained one of his blown engine's (Torp? can't remember) on a pedestal along with parts glued to the trophy base. There was also a lop-sided wood propeller mounted on the blown engine with the hand-written tag "Genuine Bill James balanced prop." The "Blast Trophy" sat proudly in the front office on one of the award shelves for the entire time I was associated with Fox Mfg. It disappeared sometime during the mid-90s or so.
Andre