Okay

so there are many slides that will be distributed so I will not go through all the

details but just giving the important messages in the topic.

So it's related to the use of the lifting gas for helium versus hydrogen or vice versa.

What are the advantages of each of them and what you need to do if you want to go to hydrogen.

I like what Christophe mentioned at the beginning.

So one of the certainly very important point is independency.

So today we must be clear

helium if we want to speak about Europe

we don't have any production

almost and it's certainly not also a clean gas because helium is coming from the processing

of natural gas.

So if we take the two points that have been mentioned by Christophe at the first presentation,

we are far away from a solution

from independency and from cleanliness if you speak about lifting

gas.

But of course is hydrogen a solution

what can be the advantages or disadvantages

I

will try to discuss that.

And so we worked at ULB

it has been also mentioned by the presentation of Natale on

SORA.

So we have obtained a SORA for 16 meter hydrogen lifting gas drone in Belgium using EASA regulation

and the Belgian Authority regulation.

We flown it a few years ago.

That was a project called FlyWin that will be briefly discussed here that I can certainly

discuss if you have more important questions.

So of course hydrogen has been used a long time ago in airships.

I will use some pictures from the Indenberg that was clearly using hydrogen as a lifting

gas with a technology of almost 100 years ago.

There have been other systems promoting that and in my presentation I will mainly speak

about rigid airships

so using gas bags

so these gas bags that you have inside

which

is of course a clear

let's say a clear

let's say key point in the success of using hydrogen

in an airship.

And I will only speak about drones

so no pilot

no people on board.

And we will have also a presentation given by Highlight

which is also an airship and

which is in fact a drone that we will fly

I hope pretty soon

also in the airspace of

Belgium where you see some characteristics here.

And this is the FlyWin prototype that we have built in Belgium.