I know that rocket motors and fins should go on the backside of the rocket, but every so often I build one with the motors up front. As silly as tractor motors are they do provide some advantages. Recently I have found another advantage. After a launch the tractor motored rockets are covered in black powder residue that must be wiped off before the rockets come back in the house because the wife says my rockets stink. Even after a good wipe down, a good once over like Wolf required Jules and Vincent perform in Pulp Fiction, there is still a bit of residue. After being left on for a few months I had to move the rockets to the ping pong table to make way for new furniture. Later that evening I heard a strange, repetitive licking sound of a rough tongue on smooth surface. Walking over to the table I found Hauptman Kitty licking away, slurping up the delicious minerals he needs for survival in the wild. The Hauptman Kitty needs no salt lick, just recently flown tractor or mid canted motored rockets. Both the Heavenly Rider and Undead Pict Warrior got a thorough lick down and cleaning, taking several five minute lick sessions to get every last bit out of every nook and cranny on the bone rockets. All mineraled up the Hauptman is ready for his favorite Friskies Buffet "Captain's Choice," but the wife insists only on Imes hair ball control to mitigate the stink of the Friskies dinners. Guess more tractor motors will have to be burned to keep the Kitty Licks in place.