Radialforce has no effect

i want a grenade to explode and am trying for hours to fire an impulse for a grenade with the radial force component but nothing works. is this a bug?

Did you set simulate physics on the other actors?

yes i did.

This guy explains it pretty well, you have to have several things in place:

Seems to work well out of the box:

Image from Gyazo

What are you doing differently?

oh felling stupid now. i did not try to raise the stregth as high as 100000. thats when the effect even begins to show. thanks