I use a tent stake nail with about 5' of cotton rope in a loop around the tail. Some people use a screwdriver to hold the rope. There are some manufactured devices available at most hobby shops that have a vertically oriented, cushioned U shaped bracket to hold the tail. The advantage to those is that it makes it nearly impossible to "accidentally" get the model to move, where as the rope version will allow the model to move forward if the rope had any slack in it when you fire up the engine. Either way, please be very careful with the prop area, and don't be too disappointed if the engine doesn't start with the first couple of flips. If new, they may take a couple of minutes to get started the first time. After you get them started a few times, and needles tuned, they usually start quite easily. Good Luck!