Does anyone know (not a guess) how much thrust in pounds from a jet engine
would be needed to self launch a 1000 lb sailplane to 2500 AGL?

Or perhaps know a link whereby I can find the information or formula
needed so I can determine the answer myself.

I've looked ..googled..etc...can't find a thing.

I did read some where online that 3,600,000 joules would be
needed.....but
can't find a conversion formula.

Thanks
Tom