Does anybody know what the letter at the end of 4730 stands for? 4730s 4730f? Anybody have a link to high altitude props? Thank in advanced for any hell

There is no such thing as a 4730S prop for the Spark. The "S" is a typo.

What does the "F" mean? Foldable perhaps?

Check this thread: https://forum.dji.com/thread-116200-1-1.html
What do you mean by high altitude props?
Spark will fly up to the 500m max limit above take off ground level - no problems.
Service ceiling is 13,123 feet (4,000 m) ASL.

Unlike a helicopter, changing directions with a quad is achieved via changing the speed of the 4 motors.  
The fixed pitch of the props from DJI are probably matched with the designed motor strength at max RPM before overloading.

Happy Flying.

Thank you for reaching DJI forum. We only have one type of propellers for the Spark, it is 4730F. You can find the information here: https://store.dji.com/product/sp ... sult-v2&position=23