Throttle settings

[Gooner4271]

Hi all
thanks for the advice on choosing a new heli, i'm goint to go for a nano cpx, mainly so i can learn to hover indoors then when i get to grips with that get somthing bigger,
this may seem like a rearly dumb question but can someone explane the different throttle settings, as far as i can tell the fist half of the stick movement builds head speed
then the movement after middle throttle controls +pitch, the do you switch to idle up so mid possition is maximum head speed the up for +pitch and down for - pitch, if thats the case do you have to switch it back to land, could somone explane stunt mode, i know these are rearly basic things to know and i will get advice and help before i try to fly a collective pitch heli. any help would be great thanks
Neal

[Stevec]

ok I'll have a go.

I am assuming you have a programmable tx.

normal mode has a default linear throttle curve. so it would look like a straight 45 degree line going from 0 - 100%

if it has adjustment points they tend to be something like 0-25-50-75-100 this is of the throttle stick position.

so now you can tune your throttle curve, an experienced flyer usually goes for something like. (these are numbers at the % of the throttle increments.

0 stick 0 throttle.
25% stick 70% throttle
50% stick 80% throttle
75% stick 80% throttle
100% stick 100% throttle.

Idle up or stunt mode artificially raises the throttle to a predefined curve that while still being controlled by the throttle channel enable you to program 100% throttle at a low stick position to enable you to fly inverted.

they tend to look like this

0%----25%-50%-75%-100% throttle stick position
100%-80%-80%-80%-100% actual throttle level.

the total 3d nutters tend to run 100% across all 5. known as a flat curve! oxymoron I know but there you go.



throttle hold enable you to shut the throttle in the event of a crash or for autorotations. if you are about to crash it is good practice to hit hold and centre the collective stick , that way you "should" minimise damage due to the blades being at zero pitch when it goes in so you are not driving it into whatever it hits.

most people flick into idle up when on the ground, the Nano has a good soft start on it so that is fine, at the end of the flight you can either hit hold or, probably better switch back to normal mode and shut the throttle.

there has to be a different procedure for nitro helicopters due to the fact that you are standing between the blades when you start it. they are usually started in throttle hold and then switched out of hold when you are standing back.

do a search on throttle curves 101 and also have a look for pitch curves 101 both are threads on helifreak in Finless bob's technical section, they give a far better overview than I can.

hope this helps.
Steve

[450man]

Just to add to that...

I don't know if you got this from Steves post but when you move the stick it controls 2 channels... the throttle AND the pitch and the same time. So going up on the stick will go up on the throttle curve and the pitch curve at the same time. So, by having a different throttle curve and pitch curve in the different flight modes (Normal, Stunt1 or Idleup1 and Stunt2 or Idleup2) you can vary the ratio of the power and pitch.

The pitch curve is wierd because 50% is normally zero pitch or there abouts and so less than 50% is negative pitch, used for inverted flight, and more than 50% is positive pitch used for normal flight.

It does take a bit of getting your head around.

Take a look at this site here for a better explanation... good site all round if you ask me...

Understanding RC Helicopter Radios and Their Functions