I would guess that the model has insufficient pitch stability and/or a flying surface that deflects excessively on a dive.
I don't understand fully why the model would recover better when in high pitch.
I would try to avoid heavy ceiling or wall bumps.
--- In Indoor_Construction_at_yahoogroups.com, "joshuawfinn" <joshuawfinn@...> wrote:
>
> Hmmm...nice article, but I must admit to being a little disappointed in that I didn't learn anything new.
>
> So here's a practical problem, one that my wife would really appreciate a solution to since it plagues her models even more than it does mine:
>
> My observation is that F1D's are pretty nice about recovering from bumps when at high pitch settings, but as the pitch drops, there is an ever increasing tendency to straighten out after the slightest hit. Some of this appears to be due to blade tuck, some due perhaps to insufficient boom rigidity, though I cannot be certain of that.
>
> In concert with this problem, does anyone have a way of preventing blade tuck at low pitch? I'm not referring to the blades necessarily getting stuck on the wing, but more of a model's tendency to let its blades tuck to a reversed condition, creating in effect a big air brake which prevents the model from recovering from mild turbulence. At our last contest, Hope's model still had a little climb left when it bumped a wall, pitched to about 10 degrees nose down, and held that straight to the floor as the blades tucked backwards and spun at about 120 rpm, preventing the model from pitching back into climb attitude. This from a model that in higher torque settings had made repeated recoveries off a basketball net during the same flight.
>
> Many thanks to anyone who can solve our F1D prop dilemma with some suggestion *other* than to increase our low pitch limit!
>
> Good flying,
> Joshua Finn
>
> --- In Indoor_Construction_at_yahoogroups.com, "Yuan Kang Lee" <ykleetx@> wrote:
> >
> > Or at IndoorDuration
> >
> > http://www.indoorduration.com/INAVPitchStability.htm
> >
> >
> >
> > --- In Indoor_Construction_at_yahoogroups.com, "Mark F1diddler" <f1diddler@> wrote:
> > >
> > >
> > >
> > > --- In Indoor_Construction_at_yahoogroups.com, joshuawfinn@ wrote:
> > > dWhich INAV issue carried it?
> > > >
> > > > Thanks,
> > > > Joshua Finn
> > >
> > >
> > > INAV#93.
> > > MB
> > >
> >
>
Received on Sun Dec 23 2012 - 10:35:33 CET