> My Aura seems to weathercock a lot. The fins on mine are actually a little
> smaller than stock because I cut tabs in them to fit into slots I cut in the
> body tube. I also am using a nylon strap/piston rather than wadding and a
> parachute instead of the stock streamer. Would it help to lengthen the body
> tube? I am thinking of adding a payload section for an altimeter in order
> to do hi/low deployment anyway. What can I expect with the increased body
> tube length, more or less weathercocking?
The Aura is heavy for its size. It tends to weathercock on D12 and 24mm
black jack motors due to marginal initial thrust. You shouldn't see any
type of weathercocking if using E15 or E30 motors (or equivalent
The longer body tube will make the rocket more stable, but the increased
weight will make the rocket unflyable on D12 motors. It will still tend
to weathercock a little on black jack motors (like the E11J) in any type
of breeze. The longer size will make the rocket much more stable for F
and G motors, though.
NAR 13559 TRA 1785 L2