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D7 - RADIO - What are Dual Rates all about ?

Firstly - Dual Rate switches are VERY useful for helicopter pilots.

What they do is to let you have 2 entirely different swash plate setups available to you at any time simply by throwing the Elevator and Aileron D/R switches.

When setting up  you computerised radio, you will normally set it up to give you the maximum amount of swash movement it can provide.  This is fine for competent pilots, but for learners, it is really useful to be able to have a 2nd set of swash plate settings that are much softer.

Most good radios provide you with an easy way to set these up.

Once you are in the Dual Rate setup screen, there is usually a little indicator that shows you the direction of each of the DR switches.  I always like to set a radio up so that with all switches OFF (away from you) the radio is in normal take off mode. So I leave the switched ON, and ensure that the DR setting for that position is 100%.  Then I throw each switch OFF, and reduce the value to around 70%-80%.  That then means that at take off with all switches forward  my swash plate will only move that percentage of it's total possible movement.

This means that hovering will be more gentle and easier, but once I decide to go into FFF (Fast Forward Flight) I want full control of the swash for aerobatics or whatever, I just flick the DR switches back ON, and have the full swash plate movement.  On returning to the hover, I throw them back off again.

In fact, with most radios, you can choose to have just one switch that is assigned to switch ALL D/R switches in one go.  Personally I prefer to save that channel and switch each one manually. 

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