i have a 3 channel nine eagles spitfire,i was trying to know how could it be converted to 4 channel . i searched many sites but couldn't find the right answer.

hi
you will have to cut ailerons in your wings and attach a hinge and then add a servo on each wing.
well this way somehow we can manage the 4th channel.
dont forget the 4 ch transmitter and reciever with this.

rgds
vishal

 

right!