http://spadworld.net/viewtopic.php?t...light=autogyro

Thats not my gyro in the link but i am trying to built a gyro out of coroplast. I have built 4 sets of blades which are all broken now and have achived only 2 flights in a 3week period. i am frustrated now!

My current plane which is much better than the other attempts is made out of coroplat fence post peices and 3/4 aluminum U channel. The mast is a peice of 1/4 inch music wire. rotor hub is a 2 blade desing made out of 1/4 inch plywood and 1.5x.25 inch lattice blade mounts. Hinges are american gutter pipe which is flexable and durable for about 35 hard impacts with the ground. My blade were set to flap to 45 degrees both ways wiht blade stops. The blades were 2mm coroplat flat bottom airfoil with a5.5 inch chord and a .5 inch tall spar and a 48 inch rotor span.
I also tryed a twin gyro with two 30 inch counter rotatiing rigid rotors.

Now my problems are not consistant at all. The single hinged rotor gyro wanted to roll over into the asending blade for so reason unknow. But i did it it to fly once wich lasted about 2 mins when the plane all of a sudden decided to nose straight up and then lose control from about 100 feet up. my models are rudder elevator type with a small 20 inch flat stab behing the mast fixed with alierons. After this flight i couldnt get it to fly again. it kept rolling over into the acending blade. One time it lifted straight but it nosed straight up and fell back down hard onto the ground. i have a 10 degree mastangle 10 degree downthrust in my saito 91 and about a 15 degree hang angle. The blades spin easily once the ground roll starts but i just cant get consistant results.

The twin rotor version fly once also but the plane ran out of fuel after takeoff and autoed down. it didnt fly again either due to a roll to the left on take off. It always rolled left but so how i managed to kick in enough right rudder to roll it straight on takeoff. It also has 10 degrees of mast tilt and 10 downthrust. The rotors were set about 7 inches above the fuselage. No diheadral in the rotor boom. I tryed one simlar to the one in the link above but it was over weight but lifted rolling over to the left ripping one of the rotor blades off the bottom rotor.

For my desings i used the average spec from www.autogyro.com to figure all of the measurements. I have been building spad fixed wings for about 3 years with great success but this gyro experiment has me really confused because every little adjustment never leads to a consistant result like dealing with a fixed wing.

Anyone have any ideas to why my gyro attempts are failing?