How do you not bend your elbows and get into a handstand in a front handspring on vault?

Basically, Front Handspring vaults have 3 major parts: pre-flight,

block, and post-flight.

They are interdependent, meaning, if the first doesn't happen, the rest won't. You need to have a good run down the runway, and approach the springboard to where you hit it where the springs are. Now we need to work on your pre-

flightA good drill would be to put a springboard on the floor and take a step and arm circle onto the board. When you hit the board, jump up and drive your heels out in front of you- not too much because you want to land on your feet.

Once you have that down, we need to work on your main problem- the block.

A good drill would be to arm circle into a handstand, and push through your shoulders to the point in which you pop off your hands for a split second.

This will also help with your post flight.

During your post flight, you want to stay hollow and have good form, meaning the basics, such as pointed toes.

That should fix your vault- hope this helps!