Operation Manual True Air Speed Vario Sensor

2. Installation

To ensure maximum possible accuracy of the

speed measurement, we recommend that you

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 ight, the tube’s

inclination to the airow 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 xed.

· The Prandtl tube must be installed in a position whe-

re it is not subject to any airow which is falsied

by the model’s power system (i.e. airow from the

propeller - propwash).

The following positions are particularly suitable:

· Motor / Power model: wing / undercarriage.

· Glider: upper third of the vertical n (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. Starghter)

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.