Hey
@Hai-Lee can you explain dual rates and expo a little more or point me to some futher info. Thanks Darryl
Dual rates is selected via a switch on your transmitter.
Simply put on one position the control surfaces move over their normal range of deflection and in the other position the control surfaces move over a slightly reduced deflection range. This allows you to select to have the plane either fully responsive to control inputs or to be a little more docile.
I set my LOW rate position for normally only 80% of maximum deflection especially for use by students as it makes the plane respond slightly slower and allows the student to reduce their overcontrolling tendencies sooner. Later when they can fly a little more precisely I swith the rate to full so that they can experience the real agility of the bird.
Expo is basically making the servo response a little less sensitive at small stick movements, (it makes the linear stick movement/position a little less linear and more exponential, hence the name.
Normally the expo is around 30% to 40% simply because if yo make it too great the centre of the control range is almost no response and at full of course it reamina full, (with too much the control stick can become almost like a 3 position stick and the plane will be almost impossible to fly properly.
Just be careful though as some transmitters require positive expo numbers whereas other require negative settings. I think Spektrum use positive numbers for their setting of the degree of Expo set.
Normally the Expo settings can be set differently for each dual rate switch setting and with greater control movement I normally increase the Expo setting slightly.
I hope that helps.
have fun!