Scorpion motor/esc problem

[fretbuzz85]

Hi, anybody has any experience with scorpion motors/esc so far? Ive been getting this weird problem.

On my Jr 9XII, i set my throttle hold to -0.5% as a safety feature. Thing is, when i start up without thottle hold, everything runs fine. But when i start up the heli with the throttle hold switch on, the moment i deactivate the throttle hold, the motor spools up automatically to a low throttle even though my throttle stick is at the lowest position. The only way to stop the motor is to activate throttle hold again.

my throttle trim is at 0, so im pretty stumped.

[fretbuzz85]

Sorry, ive just found the solution at helifreak. http://www.helifreak.com/showthread....ottle+position

Apparently, for JR 9XII, the program mix Thro->thro has to be activated for this problem not to happen.

[VinCopter]

Err … not so correct. The Scorpion ESC will see the throttle stick position and use that as the low point when you connect the battery to the ESC. I once connected the battery with mid stick, and only have half the stick range. Feels strange and reconnects the battery with low throttle stick and its ok.

The default setting for throttle hold is -5. When you connect the battery with throttle hold on, the ESC will take that as low point. When you release throttle hold, ESC will see that there is some positive value and start to spin the motor.

Other settings for the throttle channel are in defaults.

[fretbuzz85]

Makes sense. But in order for you to be able to start in throttle hold, the minimum throttle position has to be lower than that.
That minimum position was achieved through the Thro->Thro mix which i disabled.

I have no idea how this thro->thro mix works, but it brings the minimum throttle down even further as can be seen in the screen.

On a side note, can someone explain how programming mixes 1-6 works? And how to program em. Ive read the manual, but still am very confused

Thanks

[VinCopter]

Why do you need to start with throttle hold?

The Scorpion ESC will take whatever value that the receiver provide when starting. Just remember to put the throttle stick at the low position before connecting the battery. That should do it.

There are 2 types of programmable mixes, standard and multi-point. Mixes 1 and 2 are multi-point and 3 to 6 are standard. The left side is the master channel and the right side is the slave channel. When master moves, the slave will follow. Multi-point mixing provides the ability to define a customised curve of travel that the slave channel will follow.

To me, it doesn’t make sense to have the master and slave on the same channel.

Check these values;
What is the Travel adjust value for the throttle channel? Also what is the throttle hold value?

[HotDogBun]

Just got a 3000Kv Scorpion HK-2221-10.
Anyone using this one Mini Titan? Care to share your findings?
On what pinion and what's the amp draw?

I'm intending to use 13T pinion on my Mini Titan with this motor. Any comments? Mine is the newer version with the fan already incorporated.

[detach8]

Just got a 3000Kv Scorpion HK-2221-10.
Anyone using this one Mini Titan? Care to share your findings?
On what pinion and what's the amp draw?

I'm intending to use 13T pinion on my Mini Titan with this motor. Any comments? Mine is the newer version with the fan already incorporated.

you'll probably need around 15T bro. i run the smaller 2216-12 and that gives approx 3300+ kV if I am not wrong. to get about 2600-2800 rpm headspeed my throttle curve is almost maxed out. the ideal would be 2221-8 and 13T. you can go 3000rpm and more.

[HotDogBun]

you'll probably need around 15T bro. i run the smaller 2216-12 and that gives approx 3300+ kV if I am not wrong. to get about 2600-2800 rpm headspeed my throttle curve is almost maxed out. the ideal would be 2221-8 and 13T. you can go 3000rpm and more.

Will be using 13T. Not intending 3k headspeed. Its just a figure estimate anyway. I adjust by feel, more accurate to my flying.
450TH not having enough torque I need so it bogs. My main concern now is the amp draw. No point having a high HS and lots of power but you only get 3min flight. I rather content with 5min just enough power to do my stuff.

Anyone checked the amp draw on 13T or 15T setup with 2221-10? Or maybe 13T 2221-8?

[mave]

Base on calculation:
if you want around 2500rpm at let say 80% throttle, then you will need around 14t.

No need by feeling lah, "feeling" change. Data don't.

I have 14t, you can try with mine and see how it works.

Will be using 13T. Not intending 3k headspeed. Its just a figure estimate anyway. I adjust by feel, more accurate to my flying.
450TH not having enough torque I need so it bogs. My main concern now is the amp draw. No point having a high HS and lots of power but you only get 3min flight. I rather content with 5min just enough power to do my stuff.

Anyone checked the amp draw on 13T or 15T setup with 2221-10? Or maybe 13T 2221-8?

[HotDogBun]

Ya data.But what blades also affect the HS mah.Feelings won't change, if change then jialat its not HDB liaoz
I'm more concern with amp draw from actual flights to give myself a headsup.
14T?Thats a rare find from where?I don't wish to hit 15T and looking at other motors very confident 13T will be what my 450th is doing right now only scorpion likely to have more torque. My 450th many commented on low HS but being able to do all the monkey tricks so far, I'm quite comfortable, being a monkey

[HotDogBun]

I have 14t, you can try with mine and see how it works.

You using Scorpion motor right???

[mave]

Of course Blades also affect. If you chose a set of blades that weighed like hippos, of course you motor would not turn lah.

And of course you should be concerned about AMP draw. I always appreciate those who can match the right motor to do the right job like those who can find the right prop size that matches the output of the motor to fly the plane efficiently.

No wasted amp on generating High pitch scream in the air. No bloated cell, no hot motor and esc.

2cell man, my idol

Ya data.But what blades also affect the HS mah.Feelings won't change, if change then jialat its not HDB liaoz
I'm more concern with amp draw from actual flights to give myself a headsup.
14T?Thats a rare find from where?I don't wish to hit 15T and looking at other motors very confident 13T will be what my 450th is doing right now only scorpion likely to have more torque. My 450th many commented on low HS but being able to do all the monkey tricks so far, I'm quite comfortable, being a monkey

[HotDogBun]

Ya, the screaming of blades makes my knees soft.
If 13T cannot make it then I'll go for your 14T. Pls enlighten where you found 14T

[mave]

hm... since that LHS does not participate in this forum. I will tell you offline. k?

Ya, the screaming of blades makes my knees soft.
If 13T cannot make it then I'll go for your 14T. Pls enlighten where you found 14T

[fretbuzz85]

I got my 14T at RCE. Comes in a pair, so maybe can share with your friend.

Its my 1st time on a 450 size heli (titan + 3000KV scorpion motor with 45amp esc), but compared to what my other flier friends are using on the same bird, it seems to give crazy torque.

The performance with 14t is superb, but unfortunately, 5 min is the max if doing FFF (voltage reading of abt 3.75 per cell after powering down). Ran it up to 6 min and the whole system powered down on me (voltage drop to 3.1-3.3 per cell).

This was all on woodies. Just changed to fiberglass blades, and notice that when playing for the same 5 min, the voltage now reads abt 3.82 per cell.

For FFF, motor is barely above warm, but for the ESC, i can only leave my fingers on for 4 to 5 sec before it gets too hot to bear. I wouldnt consider that too hot from what i observe in other systems.