Socal500
06-12-2008, 09:11 AM
Im sure some already know this but thought I would post anyway because Im sure there are some that just bind smartsafe and are not aware of what will happen.
You can bind the 921 to Preset Failsafe, which differs from Smartsafe that is on the 7000 RX's and below in that it actually drives all the servos to a position you set during the binding process. I have seen some bind the 921 the regular way, which gives you failsafe throttle but the control surfaces remain in the position they were in when failsafe happened.
Go ahead and bind the system disregarding any failsafe procedure so you can set your heli up initially.
Set flight mode to norm.
Set your pitch curve for norm to a straight line that gives desired failsafe pitch. I did a slight negative.
Set your throttle curve for norm to a straight line that gives desired failsafe throttle. 0 across for electrics.
Turn off heli and TX.
Put bind plug on RX.
Power up RX and lights blink. ( DO NOT TURN ON TX)
Remove bind plug. Lights still blink.
With flight mode switch at norm, hold bind button on TX and turn it on. Wait till system binds. Since we set a flatline on throttle/collective you dont need to worry about stick position. The system binds to the value we set in the radio.
Turn heli and TX off. Go back in and set your norm mode up as you would want it for normal flight.
Done. Now when RX is powered up with no TX signal, the servos will go to positions set and no signal is sent to the throttle. When the RX is powered up, there is a signal from TX and the signal is lost, servos go to preset and throttle to preset.
You do not have to set straight lines as I stated but I did this to make sure that the system binds to that value in case I accidentally bumped the sticks before I bound the system. The system is going to bind to the value in the radio. So for example I had my pitch curve at 45% all the way across and throttle curve to 0% all the way across so it did not matter what position I had the stick in, the system bound to 45% output on pitch and 0% on throttle.
Hope this helps.
You can bind the 921 to Preset Failsafe, which differs from Smartsafe that is on the 7000 RX's and below in that it actually drives all the servos to a position you set during the binding process. I have seen some bind the 921 the regular way, which gives you failsafe throttle but the control surfaces remain in the position they were in when failsafe happened.
Go ahead and bind the system disregarding any failsafe procedure so you can set your heli up initially.
Set flight mode to norm.
Set your pitch curve for norm to a straight line that gives desired failsafe pitch. I did a slight negative.
Set your throttle curve for norm to a straight line that gives desired failsafe throttle. 0 across for electrics.
Turn off heli and TX.
Put bind plug on RX.
Power up RX and lights blink. ( DO NOT TURN ON TX)
Remove bind plug. Lights still blink.
With flight mode switch at norm, hold bind button on TX and turn it on. Wait till system binds. Since we set a flatline on throttle/collective you dont need to worry about stick position. The system binds to the value we set in the radio.
Turn heli and TX off. Go back in and set your norm mode up as you would want it for normal flight.
Done. Now when RX is powered up with no TX signal, the servos will go to positions set and no signal is sent to the throttle. When the RX is powered up, there is a signal from TX and the signal is lost, servos go to preset and throttle to preset.
You do not have to set straight lines as I stated but I did this to make sure that the system binds to that value in case I accidentally bumped the sticks before I bound the system. The system is going to bind to the value in the radio. So for example I had my pitch curve at 45% all the way across and throttle curve to 0% all the way across so it did not matter what position I had the stick in, the system bound to 45% output on pitch and 0% on throttle.
Hope this helps.