Doing a gender reveal flyby with a pink or blue powder. I'll maintain at least 600 feet above ground, so I don't violate any rules. The house with the party sits on a 20 acre lot, but I doubt the powder will even make it to the ground.
I'm debating on which method to use.
Idea from
1. Put the powder in a windsock, wrap it up and tied to a string. Front passenger opens the C172 window and throws it out (String will be short enough, so the windsock never hits the horizontal stabilizer) (We then pull the windsock back inside)
2. Put the powder in a windsock, wrap it up and tied to a string which is also tied to the landing strut, so when we throw it and it opens, it opens at a level below the horizontal stabilizer, and then another string to pull it back (I don't want to fly with it dangling out afterwards)
3. Perhaps a 25 second smoke grenade that is held outside the window by hand (I prefer the powder because I wouldn't want the grenade going off in the cockpit. Powder once dropped outside has very little chance of making it into the cockpit)
Any thoughts, recommendations?