Aura weathercocking

Aura weathercocking

Post by David P. Anderso » Wed, 25 Feb 1998 04:00:00



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?

 
 
 

Aura weathercocking

Post by Buzz McDermot » Thu, 26 Feb 1998 04:00:00


Quote:

> 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
reloads).

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.

Buzz McDermott
Dallas, Texas
NAR 13559  TRA 1785 L2

 
 
 

Aura weathercocking

Post by BULLPU » Thu, 26 Feb 1998 04:00:00


another note is loc's single launch lug. much better idea to cut it into two
halves. mount one on the very bottom and one up 6" or so

Bill Rossi  TRA# 3915  Level 2
President   METRA  TRA#94
Metropolitan Rocketry Association
Tripoli North Jersey
Web page   http://members.aol.com/BULLPUPP/index.html
If at first you don't succeed..................spend more money.

 
 
 

Aura weathercocking

Post by Tom Binfor » Fri, 27 Feb 1998 04:00:00


Quote:

> 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?

Put high thrust motors in it - the higher the better.