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T-REX 800 › Best throttle/pitch curve/headspeed for my flying​? t-rex 800 trekker
06-12-2016 10:21 AM  17 months agoPost 1
skytrooper

rrNovice

South-Africa

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i delved a bit deeper into the unknown (that is governor for me )

i was scared away from using governor mode reading this thread, and after reading it, one poster in particular made comments that made sense:

https://rc.runryder.com/helicopter/t707328p1/

Now, i want to adjust my pitch and throttle curves optimally for casual to little sport flying ie, circuits, stall turns, later FFF.

Please can anyone advise on what my pitch and throttle curves should look like, i will give as much info as possible, if there is anything else that needs to be known please ask:

It is a t-rex 800 trekker (currently using align 780mm blades will get 800s later on perhaps)

Gecko 150 amp opto esc
align bl 750 mx motor
jr 9xii radio

currently my setup looks like this:

Throttle curve 0 inh 60 85 90 98 100

Pitch curve: 27 51 67 77 inh inh 100

Finally all i want is a pitch throttle curve that will be easy on the heli, and so it flies comfortably.
Again i will not be doing any 3d, just hover, circuits stall turns and FFF

I would like to stay in one mode, have a gradual startup, but get up to the right speed before take off which is currently set to 55-60% throttle.

Can anyone better the curves or do they look fine ?

Throttling up for the first time, i can't wait....

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06-12-2016 01:29 PM  17 months agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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That thread was about a glow engine.

For electrics, throttle curve is usually a flat line such as

NORMAL MODE
0-70-70-70-70 for starters.

Idle Up 1
0-80-80-80-80

Idle Up 2
0-90-90-90-90

This way you can determine which speed suits you best by the flick of a switch.

You must use same pitch curve in all modes to avoid surprises.

To determine accurate speed use a tach or formula below for approximate.
RPM = Motor KV x Batt V (3.7 per cell) x Motor Efficiency (80% = .8)

Gear Ratio = RPM / Head Speed

Pinion = Main Gear Teeth (MGT) / Gear Ratio (GR)

-----------

Pitch Curve for sport flying

-2 to +10 using a pitch scale

No one can give you radios actual numbers since it will vary according to linkage setup.

~~Enjoying the hobby one flight at a time~~

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06-13-2016 07:35 PM  17 months agoPost 3
skytrooper

rrNovice

South-Africa

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That is the best reply i've gotten in a long time thanks ! now i can feel which headspeed would work for me, last question:

Are those curves you just mentioned with or without a governor enabled on the esc ?

Throttling up for the first time, i can't wait....

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06-15-2016 10:45 AM  17 months agoPost 4
Richardmid1

rrProfessor

Leeds, England

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Just make sure you have 0 pitch at mid stick. Set the pitch for +/- 10 to 11 degrees with a linear 0-100 pitch curve then increase the first pitch point (0) to 30% or whatever gives you your desired negative pitch and leave the other points inhibited. So on your 7 point pitch curve it would be 30 - inh - inh - 50 - inh - inh - 100.

Governor mode is the way to go on large electrics but im not sure how good the governor is in your esc. You want to be flying around 70% throttle for gentle flight.

60% of the time, it works every time!

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06-15-2016 11:57 AM  17 months agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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Are those curves you just mentioned with or without a governor enabled on the esc
Disabled.

The initial 70% suggestion is a "base" to begin with given we dont know how many cells you will be running or your desired head speed.

~~Enjoying the hobby one flight at a time~~

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06-15-2016 12:21 PM  17 months agoPost 6
airmontBill

rrApprentice

Wyckoff, New Jersey

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Those throttle values are for no governor engaged. For governor engaged, you select targeted RPM values for normal, idle up 1 and idle up 2. Then throttle values are set to engage those RPM values. These values can differ by ESC or fly barless systems used to control RPM. They could look like the following as an example. N - 0, 25, 40, 40, 40 /// up 1- 60, 60, 60 ,60 ,60 /// up 2- 100, 100, 100, 100, 100. Check esc or fly barless user manual for proper values.

Rockland Couny Radio Control Club - Membership Chair

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