Hey everybody, I've been fighting my radio programing for about a week now. I've asked questions on it and found out most of what I needed to do. But for some reason I can not couple my throttle, (while in throttle hold position) with my collective. But if I have not tripped the throttle hold switch then they are coupled just fine. I went to the Raptor tec. web page and they don't specify what to do in this situation. I have read everything in the programing book and still can't get it right. If anyone knows how to fix this problem on the JR XP8103 you would be of great help.
thanks

That is not a problem. That is what it is designed to do. The throttle hold function 'holds' the throttle at a set position and allows movement of the collective. It is usually set with the throttle at at high idle.

You can now practice autorotation at the flick of a switch. The throttle goes to idle and you still have control of collective. When you need the engine back you flick the switch back and it is now coupled again.

How do you run a constant speed rotor head with the idle up set at 1500 RPM, If you Idle up and increase the colective the rotor head speed will go down unless it is coupled with the Throttle, so to give more throttle as your pitch increases. I'm not sure how it all works but can you explain the idle up process to me better. Do you idle up before take off? or do you only use idle up during autorotation?
help would be greatly appreciated. Thanks

In the 8103, there are basically four flight modes - Normal, Idle-up 1, Idle-up 2, and Hold. Normal, ID-1, and ID-1 each have their own throttle and pitch curves, which you setup to so that the throttle position for a given collective pitch gets as close as possible to a fixed head speed. Throttle hold takes the throttle to ONE, FIXED setting - typically a high idle, and has it's own pitch curve, which is typically setup for auto-rotations. The entire purpose of hold is to simulate an engine shutdown, and as such, any intention of maintaining a fixed head speed in hold can only be explained by misunderstanding it's purpose.

Typically, the modes are set up as:

Normal: Pitch, about -4 to +10, straight line throttle curve with about 60% throttle at half stick.

Idle-up 1: Pitch about -4 to +10, !QUOT!V!QUOT! or !QUOT!check-mark!QUOT! throttle curve with about 60% throttle at low stick and 3/4 stick, about 40-50% at half stick, and full at high stick.

Idle-up 2: Pitch about -10 to +10, full !QUOT!V!QUOT! throttle curve with 100% at full low and full high stick, about 40% at center stick .

Hold: Throttle to about 8010 % (just give a reliable idle) and pitch linear with about -5 to +12 or so.

Keep in mind that these numbers are generalizations and approximations, and assume hover in Normal and Id-1 at half stick. Some folks prefer to hover at 3/4, and some birds have different pitch ranges, etc. so please, nobody get your panties in a wad if I did not hit the !QUOT!exact!QUOT! figures for your bird. These are just intended to give some basic setup generalizations.

Oh, and to address your specific questions, you DON'T use idle-up in an auto-rotation - that is what hold is for. Takeoff and landing are normally done in Normal flight mode, and you switch to Id-1 or Id-2 in flight, depending on what you are planning to do. When learning, and just hovering, you should never come out of Normal mode.

- Tim

thanks that clears it up quite a bit

Glad to be of help . . .

- Tim