Sim pilots and real pilots,

I need some help, I have the fine Sim. planes PT-13A by Stearman and would like to fly a inside loop.

I did as the author of this plane said and still can't get over the top on my loop. I tried this stun at 10,000 feet with a step dive to about 200 miles an hour, then I strated up in the loop pattern and then it stalls at the top and I have to slide down sideways to prevent a stall. I have seen this loop done in a TV movie, but is that all fake stuff?

by reading the tutorial that ozzy has put together it will really help you on your way with the aerobatics.

Nemo

You shouldn't have any problem, so keep at it. they used to say of the Stearman:
"To go up, pull back on the stick.
To come down, keep pulling back."
Check ozzy's tute for sure; but for what it's worth, my guess is that you're not pulling back all the way, and the airspeed is bleeding off too much as you near the top. With 200 mph "in the bank" you should have more than enough energy  to take her up and over. Not sure what you mean by "strated up", but if it involves anything other than keeping full throttle and hauling back on that stick, don't do it... just keep pulling back until you see the horizon coming up from below.  If the nose wanders, or you come out with a wing low, no big deal- do a couple more and then start cleaning it up with rudder or whatever you need to make it perfect.

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Indeed. I seem to remember finding that whatever speed I entered the loop, it ran out of energy very quickly - which would be expected of a draggy biplane - but maybe a little to quickly, which would lead to either a stall or loss of control at the top of the manouvre..

Tried out my Stearman after seeing your post, and found that 10,000 feet doesn't give you the best performance- maybe you should try a little lower. I had no problem looping at that altitude, but...
She loops great at 1,000...
Seriously, though- 3-5,000 feet is more than enough room for learning to loop. Make sure your mixture is full rich, the throttle is in all the way, and get at least 160 kts before you pull back. And pull back smoothly, but all the way- and hold it back until it you're over the top and coming back to level again. To level off at the same altitude that you started climbing at, it's also a good idea to pull the throttle back some after it goes over the top; keeps your airspeed down and makes the loop "tighter".