3" diameter 38mm Dual Deployment rocket.  This is a sport flyer t' give me somethin' t' fly 38mm motors with.  T' fins are 3/4" wide at t' base, ya bilge rat, 1/4" wide at t' tip.  There is a 1/2" wide slot from tip t' BT in each fin t' make it whistle.

Update:  It doesn't whistle so t' name has been changed t' Dog Whistle.  This is Dog Whistle DD because it be t' dual deployment version.