OK, so I did all of that, and I *still* have the problem of the forces 
in RK4 appearing to be a different scale from the forces using the 
Newtonian method.

Shouldn't I be able to just swap out the two, choosing Newtonian for 
speed, or RK4 for accuracy, and see relatively equal* results?


*Obviously not exactly equal, else there's no point.  And also 
obviously, the errors inherent in Newtonian will compound over time, 
meaning the two sets of results will diverge.

-- 
...Ben Chambers
www.pacificwebguy.com

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