The project described here is a bit more war-like. As described in two memos,
they attempted to arm a kite with a grenade, to be crashed into an enemy position.
Only the two memos remain, no supplements or photos.
The memo requesting permission to study the idea is here:
Directional Kite Detonator
Among the remnants of incompleted projects in the Paul Garber Papers
are several worth noting. One scheme proposed using crossbows and swinging
targets as gunnery training aids. Garber did some research and a few experiments
before dropping the idea.
Directional Kite Detonator, project request for
And a subsequent memo describing the experiments they conducted:
Device 5-AP, Directional Kite Detonator
I have attempted to research the grenades mentioned in the document (A-T and T-7),
but all I have found is this: