Here's a quick update to the yf23 fdm and auto-pilot settings. It flies and
takes-off reasonably well - still haven't tried landing it yet;) It can
still be a bit wobbly at times though and It's not very good at terrain
following either.
Taking off on auto-pilot is quite fun. Set full flaps and CTRL-a (assuming
you're near sea level), hit F6 to make it go straight and apply power - about
50% until it rotates then apply full power. Retract the gear as soon as it
gets off the ground and by the time you#ve done that, retract the flaps.
Quite entertaining from a tower view:)
It's not really an ideal a/c to model but apart from the aesthetics, which
appeal to me, I was curious about not having a rudder.
There's a new texture sheet too but it only makes the a/c a paler shade of
grey.
I've attached an update for the yf23 and I think I've included all the right
files - the model is unchanged (I think I'll eventually paint it in an
imaginary NASA scheme, perhaps a bit like the HIDEC F-15, until I can get
some newer pictures and see what they've done with it) so I've not included
it again.
The fdm still needs quite a bit of work - it can be a bit twitchy and wobbly
at times, and the auto-pilot roll-out and smooth need tightening up, but it's
flyable. Haven't tried landing it yet though;)
+ The wing stall angle was weird, as mentioned earlier. Values
greater than 45° don't have much physical meaning. I changed it to
25, which should be closer to a realistic value.
+ The lift="1.1" on the elevator flaps wasn't quite enough to get the
aircraft into the approach AoA. I changed it to 1.2, and it works.
It's still not as responsive as I'd have expected (then again, this
is a big aircraft...).
+ The hstab effectiveness was negative. This is wrong, as this is a
multiplier for all force generated by the surface. A surface with a
negative value will produce thrust instead of drag. :) Maybe this
was needed because the elevator was rigged backwards somewhere else?
I changed it
+ The wing and hstab had very small stall widths (very sharp stalls).
Low aspect wings should have gentle stalls, not sharp ones. I
changed it to 15 as a guess.
+ There's no rudder input mapped. This can be done with a "split"
input to the tails in exactly the same way that the aireron works on
the wing. It will simply add to the elevator input. V-tail
Bonanzas will require the same treatment.
