Can anyone direct me to a procedure/equatiion to calculate how much force a prop can generate when running astern against the anchor?

We usually set and check the anchor at 2000 rpm astern. This corresponds to our cruising speed, and stretches the chain out pretty straight at a low angle.

It would be good to know what force we can develop and relate it to the published forces on boats in various wind speeds.

Our engine will rev to 3000 moving ahead, but maxes out at 2500 when pulling on the anchor. I assume becasue the prop is stalled.

We has a problem the other day, after setting the hook at 2000 rpm. The wind blew up to 30-35, and a huge power boat made a massive wake which seems to have pulled the hook out and it did not reset. We were on board, so it was only a PITA, not a dangerous situaiton.