Percussion drill DY Need help and ideas

[irenesg]

Here i try to build cheap Percussion driller for drilling 40m deep well.
i already bought 3000RP diesel engine (very old for $50).
i drafted here sample. my worry is it wont work i need at least 2m pull and free drop to drill.
please guys help me out with ideas thank you.
here attached the file

 

[wotan]

You must be having a larf

 

[merlin50]

another nutter