Mini-T: Findings and Questions

[Nosein]

Hi, finally put a few packs thru the Mini-T and want to share some findings and ask a couple of questions (My Mini-T is totally stock for now with headspeed around of 2500 using TP Xtreme 2070 25C with 7 mins flight limit):

1) ESC
Couldn't get the governor (Programming Setting of 5-2; with Throttle at 75% for 2500 rpm) to work well - have premature shut-down (after 1 to 2 minutes flight with "Std Lipo" protection Setting) and although can be restarted. Very frustrating.

Went back to T-P curves, no more premature shut-down and can go all the way to 8.5 minutes. Flying is ok but I prefer Governor mode. Anyone have good experience with Governor mode on Stock ESC? Can share what you do to get it to work well?

2) Blades
Tried with both Stock Main Blades and also Align 315 (take from my TREX ). No problem with blade tracking since I use the TT spacer. Seem the Stock blade like "slightly more stable" although the difference with Align blade doesn't seem much.

3) Motor Upgrade:
I saw in R***r that their demo Mini-T uses the Align TREX 430L (3350 KV matches the Stock Mini-T motor). Its an inrunner. I am using the 430L on my TREX SE - works great and is not hot after 7 min of flight. Anyone uses the Align 430L for their Mini-T?

[justfly]

Hi there, very interesting! I've some questions for u. Did you try 325, or even 335 blades? Was the ESC hot in gov mode? Do you use a BEC? What are yr electronics? It might be due to high amp draw of yr electronic components. Also, i may be wrong bt the align motor should be an outrunner just that it has an outer static shell. You don't feel the heat cos its 3 layers.

[Heli_fanatic]

Hi there, very interesting! I've some questions for u. Did you try 325, or even 335 blades? Was the ESC hot in gov mode? Do you use a BEC? What are yr electronics? It might be due to high amp draw of yr electronic components. Also, i may be wrong bt the align motor should be an outrunner just that it has an outer static shell. You don't feel the heat cos its 3 layers.

yea i was about to say the motor was just an outrunner in a can

[Nosein]

Hi Guys, didn't know the 430L is an outrunner in a can Its good to know, no wonder its not too warm after 7 min of flight in my TREX.

Hi justfly,
I only tried 315 because I only use 315 on my TREX SE. Tried 325 once on my TREX and didn't like it. I am going to use 315 in the Mini-T as my lipo and ESC (in gov mode) is not hot anymore - just a little more than warm

I didn't use a BEC and my electronics are stock motor, stock esc, GY401 with S9257, 3xHS65HB for cyclic.

In another thread, I mentioned I can't get the stock ecs to work in Gov mode and now I got it working. What happened is that I copied my TREX SE setting to use for the Mini-T on my Futaba 12Z. The Mini-T have "premature shutdown" - basically waning headspeed (low then high and sometimes stay low and stay high). I played with the TX setting and long story short, my TREX SE have throttle mix of 30% for E->T, A->T and R->T. I disabled this on the Mini-T setting and the Mini-T esc works great now in Gov mode (I tried to re-enable throttle mix and find that the Mini-T esc can work in Gov mode if the throttle mix is not set too high - I guess the throttle mix may be confusing the esc throttle control/setting).

I am still thinking of upgrading the motor and based on info from various threads, narrowed it down to the following (supposed to be a good combination of power and current/lipo consumption):

1) Z-Power Z10A-3300

2) JGF 500SH

3) Hacker A20-6XL

Wonder if you or anyone have any experience/opinion of the 3 motors.

[johndyl]

may i ask why do u need the mixings? especially when u have gov on?

[VinCopter]

Don’t uses throttle mixing when the ESC is on governor mode, its gets confused and tries to play catching up.

I notice that this ESC can only take one high throttle percent point from the zero (start). It feels like the auto calibration mode, must see the high end point first, than it can operate properly in the lower range. I am referring to the heli governor mode.

I’m using the stock motor and ESC with 100% flat throttle curve. 13T pinion and 325 Align CF, headspeed around 2.9k. I set timer to 5 minutes, don’t want to hurt the lipo. Charger puts back between 1.5 Ah to 1.7Ah depends on how hard I fly. ESC is warm and the motor is as usual hot, can’t leave the finger there for more than 3 sec. And the lipo is not too hot, can hold in hand.

[VinCopter]

Oh, why 100%. ESC works more efficient in the higher % range. And I notice that when in gov mode, the power output is reduced. Think this serves as a reserve for the ESC to throttle when needed.

[Nosein]

Yeah, should have disable Throttle Mixing under Gov mode

BTW, any opinion if its better on Align 315 or Align 325 blade? Any significant difference? Thanks.

[johndyl]

Yeah, should have disable Throttle Mixing under Gov mode

BTW, any opinion if its better on Align 315 or Align 325 blade? Any significant difference? Thanks.

ya lor.....u dont need T.mixing with GOV

315... will make ur mT more responsive lor... like a trex on 325..

but if u are going to start hovering inverted.. i'll recommend the 325s for the slighty inc stability..

if u feel the heli isnt responsive enuff on 325, try zeroing ur expos and inc ur cyclic pitch to 7 or 8 deg.. i feel that 6deg is too slow for the mt and it cant roll/flip fast enuff.

on the other hand, 6 deg cyclic is already quite plentiful for the trex and 6.5 is abt the max u can go before getting servo binding..due the the swash

[jansonfinn]

Don’t uses throttle mixing when the ESC is on governor mode, its gets confused and tries to play catching up.

I notice that this ESC can only take one high throttle percent point from the zero (start). It feels like the auto calibration mode, must see the high end point first, than it can operate properly in the lower range. I am referring to the heli governor mode.

I’m using the stock motor and ESC with 100% flat throttle curve. 13T pinion and 325 Align CF, headspeed around 2.9k. I set timer to 5 minutes, don’t want to hurt the lipo. Charger puts back between 1.5 Ah to 1.7Ah depends on how hard I fly. ESC is warm and the motor is as usual hot, can’t leave the finger there for more than 3 sec. And the lipo is not too hot, can hold in hand.

How abt in Idle 1?

[VinCopter]

How abt in Idle 1?

I'm referring to Idle up 1, and normal mode with zero at low stick.

[jansonfinn]

I'm referring to Idle up 1, and normal mode with zero at low stick.

i c, so in idle modes, even mid throttle still in 100%? that mean won't have V-curve already liao ah? In another words, u onli play with the pitch while in idle

[VinCopter]

i c, so in idle modes, even mid throttle still in 100%? that mean won't have V-curve already liao ah? In another words, u onli play with the pitch while in idle

Yes, that is correct. The throttle is control by the ESC in governor mode.

When ESC in gov mode, all throttle curve is flat. Except the normal mode start with zero at the first point, than flat from second points onward. I'm using 55% for that.

[jansonfinn]

Yes, that is correct. The throttle is control by the ESC in governor mode.

When ESC in gov mode, all throttle curve is flat. Except the normal mode start with zero at the first point, than flat from second points onward. I'm using 55% for that.

oic, u mean u r using 55% for ur normal mode? won't it be too low?

[VinCopter]

oic, u mean u r using 55% for ur normal mode? won't it be too low?

Just enough for slow scale flight.