2Chris:
I hade my worries about having so much weight below the trust line, but based on other people experiences I decided to continue like this.
I will now first fly the plane and see what happens.... I always can put the pack in the fuselage but then I have to remove the wing every time to replace batteries, or make a hole behind the 'fire wall' (if you can speak of that with the electric planes

) so I can but the pack in the fuselage from there. We will see.
It surprises me that 2 strips of Velcro is enough to keep the pack in place, even when snapping the plane. But if it works, it works... and I have to get used to 'what is enough'.
Evolis will be flying like this is about three weeks .....
thanks for all the info
Winfried