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Paramotor glider - PPG

EN standard describes certification of free-flight glider and doesn’t take care about glider powered by engine. Today it is DMSV and DULV doing tests and certification with engine.

Testing in free flight
We are testing and certify paramotor glider in free flight according to EN 926-1 and EN 926-2. If the paramotor glider has reflex profile, we only testing with the trimmer in the lowest configuration (trimmer closed). With this test we can find out how the glider acts in free flight and have an idea what kind of glider this is with motor. These tests can not replaced test with motor.
For testing with motor we have to consider all different type of configurations; High-low attachment points, different types of harness, powered engine etc. It is not as easy as testing glider in free flight. Today we only testing paramotor glider according to EN standards.
We can offer additional test for manufacturer to measure force on each riser (read below).

Force measurement
December 2006, we received an instrument and 4 sensors that are able to measure the force (load). We connected the sensors on each riser and the sensors are connected to the instrument. The instrument is logging the force from each sensor every second. See pictures here.

The objective of this system is first of all to recognize a parafoil on a paraglider; if it is a standard profile or with a reflex profile? Paraglider with reflex profile is popular in paramotor circle, where they want more speed with better tuck resistant. Read about Reflex profile and Mike Campbell-Jones from Paramania, the man behind this technology.

We co-operated with Swiss Federal Institute of Technology and with Dudek Paragliders to develop a system to measure the force on the risers. The system we have can be expanded with four more sensors. This is interesting when we want to measure the force for example on each line on A and B risers, when certain manoeuvres are done.

To make a good reference of a reflex profile, we tested with Action from Paramania/Dudek Paragliders. Action is a glider known for its reflex profile. Here is the result.
We flew in certain speed configurations; closed trimmers, ½ trimmers, open trimmers and again the same but with use of speed bar. The pilot must be very quiet in the harness and totally neutral. Every movement will be measured and log into the instrument.

Summary you can see with higher speed, more force on A risers, while C and D reduces. If you sum the force on each riser, you will get approximately 42 kg. And for the sum of the risers on the other side of the wing, will be 84 kg and the total weight in flight

 

Written by Randi Eriksen
Thursday, 01 November 2007

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