First off, I've simmed about 20 or so rocket on OR. And I'm impressed with the results. Except...
For some reason, OR overestimates apogee and flight time on my AT Cheetah by 20-25%. It's consistent with any motor tried. For example, a 24/40 F39 gives 1486ft and 9.03 seconds, while in reality I get 1123ft and 7.3 seconds. I suppose my altimeter could be off some, but the apogee time is supported by a video of the flight. An F24 simmed at 1425ft and 9.13 seconds, I got 1083ft and 7.6 seconds. I realize that OR isn't going to be perfect, but on all my other rockets it has been much closer than this,
I'm using a RocSim file supplied by Aerotech, ported to OR. I've checked the principal dimensions, especially diameter, length, and fin size and shape. I had to add 0.7oz to match my actual measured weight (probably too much paint). So I've verified size and weight, what's left?
FWIW, I'm using the same settings for wind, etc. as I use on my other (more accurate) sims.
Hans.
For some reason, OR overestimates apogee and flight time on my AT Cheetah by 20-25%. It's consistent with any motor tried. For example, a 24/40 F39 gives 1486ft and 9.03 seconds, while in reality I get 1123ft and 7.3 seconds. I suppose my altimeter could be off some, but the apogee time is supported by a video of the flight. An F24 simmed at 1425ft and 9.13 seconds, I got 1083ft and 7.6 seconds. I realize that OR isn't going to be perfect, but on all my other rockets it has been much closer than this,
I'm using a RocSim file supplied by Aerotech, ported to OR. I've checked the principal dimensions, especially diameter, length, and fin size and shape. I had to add 0.7oz to match my actual measured weight (probably too much paint). So I've verified size and weight, what's left?
FWIW, I'm using the same settings for wind, etc. as I use on my other (more accurate) sims.
Hans.