Yea, I had a whopper several years ago. First you must have a way to hold the thing while the rotors are spinning up. I tied about a 3' section of 100# dacron fishing line to the tail wheel area, just let it dangle in flight. So I would stand on the line engage the clutch encrease the gass untill it makes you nervous...lift you foot of the string and at the same time disengage the clutch and add full power, should be at about 3/4 throttle when you release. here is the MOST IMPORTANT part if you dont do this you will ground loop and crash. You must take off in a wide sweeping left hand curve. Do not add any right rudder or go straight..think LEFT TURN, LEFT TURN. Dont know why just know ...crashed several times not doing it this way. These things dont do a normal ground loop they spin around about 2 times, fold the right gear up, which flips it over and rekits the tail and breaks a bunch of other stuff.
Good luck