Multiplex True Airspeed Notice D'utilisation page 14

2. Installation
To ensure maximum possible accuracy of the
D
speed measurement, we recommend that you
GB
install the Prandtl tube in the model as described
below:
· The tip of the Prandtl tube must face directly
forward. When the model is in level flight, the tube's
inclination to the airflow should be 0°.
· The Prandtl tube should project at least 30 mm
out of its mounting. The greater the projection, the
higher the accuracy. Please ensure that the tube is
securely fixed.
· The Prandtl tube must be installed in a position whe-
re it is not subject to any airflow which is falsified
by the model's power system (i.e. airflow from the
propeller - propwash).
The following positions are particularly suitable:
· Motor / Power model: wing / undercarriage.
· Glider: upper third of the vertical fin (see right-hand
drawing).
· Glider or jet: extreme fuselage nose.
Caution: in this case it may prove necessary to incre-
ase the projection. If possible, it is a good idea to
emulate the full-size aircraft (e.g. Starfighter)
Tip:
A short piece of fuel tubing intended for petrol forms an
excellent mount for the Prandtl tube. It is then a simple
matter to remove or replace it.
14