So i made it LA and back today without incident untill I entered the pattern at my home field. I called "entering on a 45 for left traffic runway 32". Then another pilot who was rolling called "crosswind departure" The departure procedure for ALL aircraft at Havasu is to remain on runway heading for 1 mile, then a slight left turn (290) untill reaching 2500. It is marked at the threshold of 32. This bozo decides its ok to turn crosswind, imediately after takeoff then start heading accross the downwind path at pattern altitude. I saw him turning towards me as I was turning downwind, couldnt have been more than 2 seconds, and I started to turn to get away from him, within 2 more seconds he was very close and still heading right at me, I had to nosedive and perform a steep turn to avoid him. we would have slammed into eachother, No doubt about it. I never realized how fast an approaching plane can come up on you. From the moment i saw him till the missed impact couldnt have been more than 10 seconds. I dont think he ever saw me, and of course he never made another transmission. I am so angry at this bozo, he could have killed me and my daughter this morning for not following procedures. I dont know his tail number so i dont think there is anything i can do about it. Glad it turned out ok. On a side note, the folks at fullerton airport in LA were as nice as ever. You have a great airport there jeff.