Andy Ross writes:
> One exacerbating factor that I noticed is that the Cub we model has a
> *monster* elevator. Holding the aircraft at its stall AoA requires
> only 35% back stick. Is that really correct? I changed the "lift"
> parameter on the hstab from 1.7 to 1.3 and seemed to get better
> results. I've never flown one, though, so I hesitate to check the
> change in. As above, this makes the "moment per elevator" derivative
> bigger and the problem stiffer.
This is from an old message in my patch queue, and Andy made changes
to YASim after posting this. Just for the record, I tried changing
the lift parameter to 1.3 with the current code and got this:
YASim solution results:
Iterations: 513
Drag Coefficient: 71.6363
Lift Ratio: 16.1018
Cruise AoA: 1.75068
Tail Incidence: 0.708758
Approach Elevator: -1.07615
CG: -0.876, -0.000, -0.114
YASim SOLUTION FAILURE:
Insufficient elevator to trim for approach
I guess that the J3 Cub really does need the monster elevator.
All the best,
David
--
David Megginson, [EMAIL PROTECTED], http://www.megginson.com/
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