fixed pitch

[daveydw]

what pitch is a fixed pitch heli set at

[Nutz]

A fixed pitch heli normally has curved blades and fixed blade grips. so the answer is I don't know as the blade grips aire fixed and the blades are curved.

I think they may be a issue when fixing straight blades at an angle as you are reallying on head speed for lift so if you want to climb hard or fast you may over speed the the head.

[daveydw]

i need to know as i have a walkera 76c which is a fixed pitch heli but it is mounted with a collective pitch head
so i need to know what angle the blades should be for take off from throttle

[daveydw]

this is the head set of the heli

[Smoothound]

Just keep trying it and each time it doesn't hover or climb just increase the pitch.

It's all dependant on available headspead and how much pitch the motor fitted can handle without burning out so there is no set pitch.

[daveydw]

how much throttle should there be before it starts to lift

[Smoothound]

This is what I mean it's all relative. It depends how much pitch you have. Each one is dependant on the other.

Ideally you would want it to hover over half throttle preferably nearer 3/4 to full throttle. how is the tail controlled? I assume via another motor? If this is the case if you have too much pitch on the main rotor the tail rotor will struggle to keep the tail in line.

[daveydw]

hi the tail has a seperate motor which i think only kicks in when the control stick is moved left or right i have it starting to lift now on 3/4 throttle but it pulls to one side straight away

[Smoothound]

Tail should kick in without stick input otherwise heli will piro like mad

[daveydw]

yeah just tried it tail kicks in about 20% throttle

[Raptorite]

The pitch of most micro electrics fitted with standard motors is usually +- 7 degrees. You need -7 at full bottom stick, 0 degrees at mid stick and + 7 degrees at top stick.

Start with the trottle ramping up to around 85% at the hover point and tune as necessary. Setup an idle up 1 with a straight line throttle curve of whatever you settled on as a hovering throttle and you're done

One thing you might want to do is to set the pitch curve up to the +- 7 degrees mechanically using the end points and then restrict the bottom pitch to no more than -3 degrees using the pitch curve, as otherwise if you panic and drop the stick suddenly, the model wont drive itself into the ground at full pelt

Cheers,
Pete.