Helicopter Rotor Direct Drive

[Quadrotor]

Just a question, why would zero pitch be used?
Surely at zero pitch then little to no lift is being produced so the heli would just fall out of the sky. Am i missing something?

My heli would not need to perform crazy stunts, just needs to lift a nice payload and hover well. Move from one waypoint to the next. It will have close range controls but i also have radio transceivers that can transmit over about 3KM.(I belive you can only fly line of sight tho at the moment).
For long range flying then i will use a PC/TABLET with a GUI.

[dillwhacker]

Yes. It seems that the rudder power is limited by the 'reduced pitch' pair not going through zero. So hooning around with lots of + pitch means lots of room for differential = powerful rudder.
But pottering around at +1 degree on all 4 heads means a weak rudder because you can only increase one diagonal pair by 1 degree, and reduce the other pair by one deg....
Probably.

[dillwhacker]

Just a question, why would zero pitch be used?

You're right - neg pitch is only for vigorous / inverted / 3D flying.
And getting it down when a hoofing great gust of wind sends it skywards!

[sp4rky-m4rky]

Haha yes exactly, thats what I was trying to get across.

I just want to have a play with one and it would take no time to work it out. No doubt it will end up being far cruder than we expect.

Regarding why would you want zero pitch, so you can descend more quickly. And negative is another step better so you can actively accelerate downwards without being limited to the rate determined by gravity. As well as that it gives you much better controll being able to loose all lift or achieve thrust in the opposite direction. Something that conventional multirotors struggle with or fall down on.

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[Quadrotor]

Ok, i can see yaw becoming a problem then with how i want to use my heli, so i will stick with the original plan. 1 main rotor and 3 smaller props for controls.

[Quadrotor]

In my rotor head kit there was a small part that i dint have a clue what it did. I have just found out that the rotor i have is a rigid rotor head. This additional part appears to restrict the movement of the swash plate quite a bit, is this what it is intended to do??

The part im talking about can be seen here.

rotor.jpg

[J3DI]

That part ensures phasing between swashplate and blades doesn't change. If you are using the swash plate you will need it, if not you need to use a design similar to how the tail rotor pitch is contriolled.

Seems like you have jumped in at the deep end with this, could be an expensive route for you.

[Quadrotor]

Yep certainly jumped in at the deep end. Its how i learn.

Clearly im not the expert when it comes to RC stuff, however i do have a goal. I also have some very nice people on a forum who are able to help me with the info i need

I can see now what that part does and i can see how it keeps the swash in sync with the rotor, quite a simple but clever piece of my puzzle