hey guys......Im trying to balance a sig king kobra and it seems to be very tail heavy.the plans say the c/g should be 3"3/8,but no way.Can of you guys help me with this.It will take a ton of weight to get it to balance.I have a os 60 on it now.
thanks Fred

ffdg,

Hi,

Try moving the CG back to 3 3/4" to 4"; 3 3/8 sounds as if its too close to the leading edge causing your bird to be tail heavy. The worst model I have to CG is my KMP Hurricane; I have a Magnum 1.2 in the nose with a Dave Brown spinner; I still had to add 19oz of lead to the nose before she would balance correctly to include moving the flight battery under the fuel cell.

Brad

hi I found 5 5/16 and it came out good.I did have to add so weight to the tail but it flys very nice.
thanks Fred

regardless it should be about 25 - 33% of the mean aerodynamic chord.

Hi the balance is very good now and she flys great so now I have a problem with keeping my rudder on.The rudder keeps braking my hinges.I had 3 dubro hinges on it and they broke off after about 4 flights,repaired it and installed 4 hinges and today they broke off......What is wrong and what can I do about this?....HELP.....!!!!!!!
thanks Fred

Never ha a hinge problem of any kind on a Kougar or King Kobra … except in a crash. However the rudder is usually connected to the front wheel steering, which receives a lot of shock load.

Bill