Water Rockets - Fins Index
Putting fins on a
rocket is a fairly basic thing but can take time and
therefore needs to be done carefully. Knowing what
options are available is important as you may find that
you need to have some fins in a hurry.
detailing fins described elsewhere on this site, there is
an additional method that varous people have found useful
The Fins . . .
made from the top of a pop bottle.
This is a 'quick and dirty' solution and is used
in the 250ml
starter rocket. They have the
advantages of being quite robust, transferable
from one rocket to another and even lower their
drag at higher velocities but they are not
particularly pretty, nor do they have a very good
made from the side of a pop bottle.
These take longer to make and are very resilient.
They can be taped or glued and use a cable tie to
secure them. They can be mounted on tapered or
straight sections, pressure vessel or skirt.
These are the fins shown in the 1½ litre
- Fins made
from CD ROMS. Recycling at its best.
They are rigid and provide a large surface area.
With a soldering iron, they can be cut to match
perfectly the side of a tapered skirt or stright
skirt. These are used in the 4 litre rocket.
Unfortunately, they do add to the overall weight
more than the second option above.
- The fins from number 2 above, mounted
on an aerodynamic skirt. These have
all of the advantages of the number 2 fins but,
when a pressure vessel is damaged more than you
can trust it, these fins can be removed and put
onto a new pressure vessel.
In addition to these materials, you can substitute
cardboard, light wood or other plastics for the materials
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