|Unlike other FlisKits
engine mounts, the EMK2-18-70 has the engine tube space apart making this engine mount kit
perfectly suited for Gemini Titan sport scale designs or any other Titan missle type sport
you are designing a cluster model or converting a model from single motor to cluster motor
use you need to verify the stability of your model before flight. Adding more motors
to the model increases the weight in the rear of the model moving the Center of Gravity
(CG) further back and may cause instability in your model. If you are converting a
known stable model, the easiest method to assure stability is to fully load the unmodified
model for flight (motor installed, recovery device, etc) and balance this model on your
finger. This balance point is the CG of your model and you should mark this.
Then install the cluster engine mount and prep your model for flight again. You
will note that the CG has moved towards the back of the model. Add nose weight to
the nose cone until you have moved the CG back to its original point. If you are
designing your own model you should make yourself aware of model rocket stability and the
relationships between the Center of Gravity and the Center of Pressure and how to measure
Instructions for our engine mounts provide two methods of
construction, "Recessed" or "Tulanko TailTM"
The Recessed method (shown above) is the
more conventional method of engine mount construction, with the lower centering ring
recessed up the engine tube. This allows for easy engine installation and removal
but also subjects the bottom of your model rocket body tube and motor tube to damage
during landing and storage.
The Tulanko-TailTM is a unique
method of engine mount assembly that has the lower centering ring installed flush with the
bottom of the engine tube and the completed assembly installed in your model rocket such
that this centering ring is flush with the bottom of the model rocket body tube. The
feature of such construction is that it makes the bottom (tail) of your model rocket very
strong and resistant to damage upon landing and during storage.