Is My Futaba 7chp Defective?

[newtoit]

i have never flown a copter in my life. got a t-rex 450se 2 weeks ago. finished building and was powering it up to see if it all worked. heres the problem. with the universal understanding that throttle is the left stick up and down. rutter left and right.
right stick up and down elev. left and right aliron.
after setting it up last night , all these things worked as i just described. now when i returned to it today to hopefully start flying, a check of systems has all the servos except rutter, moving all at once on the left up and down throttle stick. on the right stick , the same thing. the rutter is the only thing working correctly left and right on the left stick. i realize there should be some movement but the servos move too much and all at the same time on both sticks. is the radio defective or is there something i should set up? btw, the radio is the most confusing thing along with its instructions for a beginner.

[Motoman8504]

I noticed you said you have the T-rex SE. Those helicopters use eCCPM and therfore every input you give it except for rudder will make all three servos to operate at the same time. I'm not sure if you knew that, but that's what I think you're problem is. For example, moving the left stick(throttle\collective on mode 2 Tx) will cause all 3 of the servos connected to the swashplate to move in the same direction. That makes the swashplate either move up or down to increase or decrease the pitch of the main blades. I seriously doubt that your 7CHP is defective unless it got abused, because I've had mine for about a year and a half and haven't had any problems with it. One more thing to make sure of is that the radio be set for the right swashplate 90, 120 degree etc. But that would only be the case if you're controls weren't moving in the right directions with respect to the Tx, like fore\aft should give you fore\aft control on the heli respectively. I hope this helps because I don't know how the radio could suddenly get messed up, that's kind of mind boggling. :eek:

[newtoit]

I noticed you said you have the T-rex SE. Those helicopters use eCCPM and therfore every input you give it except for rudder will make all three servos to operate at the same time. I'm not sure if you knew that, but that's what I think you're problem is. For example, moving the left stick(throttle\collective on mode 2 Tx) will cause all 3 of the servos connected to the swashplate to move in the same direction. That makes the swashplate either move up or down to increase or decrease the pitch of the main blades. I seriously doubt that your 7CHP is defective unless it got abused, because I've had mine for about a year and a half and haven't had any problems with it. One more thing to make sure of is that the radio be set for the right swashplate 90, 120 degree etc. But that would only be the case if you're controls weren't moving in the right directions with respect to the Tx, like fore\aft should give you fore\aft control on the heli respectively. I hope this helps because I don't know how the radio could suddenly get messed up, that's kind of mind boggling. :eek:


thanks. to be honest, i dont know if it is defective. the heli went bonkers on me and cut my finger pretty good because stupid me turned the transmitter off before unhooking the battery. it knocked the tx on the floor, burned all 3 servos, the main blue gear and splintered the blades on my 1 finger. prior to that, i was about to start flying and it appeared all worked well. to thatpoint i had not heard the servos run when applying the throttle cause the engine always ran. i heard them with the other stick. so maybe they always were moving before. i just noticed that today after i put in the new servos and used another battery to just test the servos. (still gun shy of that thing and fingure not healed)

another thing, for some reason one of the servos was not working when i finished and not untill i hit one of the flip switches on the radio shoulder, did it come on. i knew that was not right. so i started thinking that maybe i did some damage to the radio the other day. i dont know.

[Motoman8504]

First of all, OUCH!! Been there done that with a lite machines like 3 or 4 years ago. But as for the one servo not working until you flipped one of the switches, well that isn't unusual. It depends on which servo it was. I'm not sure exactly what it's like on a T-rex but on my Raptor if i full bottom on the throttle and flip the throttle cut and then move the throttle stick again without flipping the switch back then the throttle servo won't move because that is meant to kill the engine. When I flip the throttle hold switch it does nearly the same thing except that the throttle stick soesn't have to be at the bottom and flipping that switch won't kill the engine it will only hold the throttle at idle while letting all of the other controls continue to function. The reason I'm not sure about the T-rex's is because they are electric and don't have a throttle servo, so unless you hooked up one of the servos in the throttle spot then I'm not sure what else could be causing that. A good thing to do is to read through your manual for the radio so that you can understand what all of the switches do.

[newtoit]

First of all, OUCH!! Been there done that with a lite machines like 3 or 4 years ago. But as for the one servo not working until you flipped one of the switches, well that isn't unusual. It depends on which servo it was. I'm not sure exactly what it's like on a T-rex but on my Raptor if i full bottom on the throttle and flip the throttle cut and then move the throttle stick again without flipping the switch back then the throttle servo won't move because that is meant to kill the engine. When I flip the throttle hold switch it does nearly the same thing except that the throttle stick soesn't have to be at the bottom and flipping that switch won't kill the engine it will only hold the throttle at idle while letting all of the other controls continue to function. The reason I'm not sure about the T-rex's is because they are electric and don't have a throttle servo, so unless you hooked up one of the servos in the throttle spot then I'm not sure what else could be causing that. A good thing to do is to read through your manual for the radio so that you can understand what all of the switches do.


i had the radio on the wrong swashplate setting and it was causing a servo to operate on switch E or A. working now. thank you.