Quick sanity check please to double check my thoughts.

What has to be changed to make an  iFlight Nazgul Evoque DJI Vista 4S run on 6S packs?

Youll need to make sure the ESC/FC is rated for 6s; im not sure which model is in your exact quad as there are like 30 versions of this damn quad online and its 2:30am for me lol, and youll need to either put a throttle limit into your transmitter due to your motors being too high of a KV, or get new motors at a lower KV rating. vista is fine at 6s, and you probably don't have anything else running off of vbat so you should be fine there.

Thanks for your thoughts.  All this is spurred on by this actual quad here having extremely poor duration.  

I bought at a high point in the electronics shortage, and have suspicions that I might have a "bottom of the stock barrel" miss match of parts. That thought is not helped by the motors being completely un-labelled on these models, so no visual clue.  I suspect (unproven of course) that it may have 6S lower kV motors affecting its performance.

Betaflight shows :-

# Betaflight / STM32F7X2 (S7X2)

board_name IFLIGHT_F722_TWING
manufacturer_id IFRC

Spec for that name shows:-


FC // SucceX-D F7 TwinG

   MCU: STM32 F722
   Gyro: ICM20689
   Baro: NO
   Blackbox: 32MB
   Betaflight OSD: YES
   BEC: 5V 2.5A / 9V 2.5A
   Current sensor scale: 100
   Inverter for SBUS input (UART2-RX)
   Smartaudio & Tramp VTX protocol supported
   Beeper pad: Yes
   RSSI input pad: No
   UARTs: 4
   Motor outputs: 8
   Uart:4*UART(UART1、UART2、UART4、UART5)
   UART1 for Receiver
   UART2for VTX HD/Analog Telemetry
   UART4 for GPS or other sensors that require a serial port
   UART5 for ESC Telemetry
   8× Dshot/PWM outputs
   1× I2C
   1× SH1.0 8pin connector for ESC（GND/BAT/M1/M2/M3/M4/CUR/R5)
   1x SH1.0 6pin connector for Any Receiver or DJI（R1/GND/R2/T2/GND/+9V）
   Input voltage: recommended 2-6S, MAX 8S
   Firmware target: IFLIGHT_F722_TWING
   Mounting pattern: 30.5*30.5mm φ4mm with Grommets φ4mm
   Dimensions: 36*36mm
   Weight: 8.1g
   USB Type-C

So the FC is 6S capable if you believe that.

No idea on the ESC board (yet)


I'm hoping the upcoming winter weather will give workbench time to open it up, and might well do away with the over engineered side plates, etc, etc anyway, the LEDS are useless since I do not fly at night and they are just not visible.

Virtually all modern quad electronics that were bought within the last 2-3 years are rated for 6S so I would be very surprised if the ESC isn't. But check it anyway.

To use a 6S LiPo on motors with a KV designed for 4S you need to go to the PID Tuning tab in Betaflight Configurator and in the "Throttle and Motor Settings" section on the right (assuming you are using Betaflight Configurator 10.8.0), set the "Motor Output Limit" to 66%.

You won't get the same efficiency and flight time as using a 6S LiPo on motors which have a KV specifically designed for 6S voltage, but it will still be usable without burning out your motors. What Betaflight effectively does when you limit the motor power is to use a PWM output to reduce the duty cycle of the motors, thus reducing the total continuous voltage that they actually receive. So it will be like they are still receiving 4S voltage when using a 6S LiPo.

Thanks, yes. I probably don't have enough life span left to get the ESC out for a look and likely no gain if I do bearing in mind it'll likely have no ident to help, like the unmarked motors.

This reads like a switch to 6S would not it seems help the basic issue I have with this Evoque, which is desperately short pack duration.  It is only managing at best 3 mins flight time doing mild cruising. The SAME 4S packs easily manage 5 mins on an EMax Hawk 5" and a GEPRC Mk4 6" and a GEPRC Mk5 5", the latter being a 6S version running unchanged on the 4S packs.

This with 1350, 1500, 1550, 1700, 1800 and even 2200 mAh 4S packs all being tried.(mostly I fly 1800mAh 130-260C Gaoeng packs on my 5" quads)

I'm having to severely throttle manage this thing from as little as a minute into any flight with known good light high C rated 1500mAh 4S.  Been that way since new.

I have  gone over this quad carefully, there appears to be nothing in its betaflight set up, no physical ills, no dry joints, no over long wiiring, good bearings. Have tried differing props from the ones supplied through Ethix to DAL Folds,  etc, etc, etc. No improvement.

I find it quite surprising that while I have placed questions in the hope of another owner giving their flight duration findings, no-one has ever replied on their experiences good or bad.

I have placed questions in online review threads, pretty much all of which give/gave glowing reports, but again, no comments, fore or against my findings.

Over the years I have run a lot of plane and quad motors at above their supposedly max rated voltage relative to stated kV or at well above their rated prop loading.  Still have a couple of now quite stone age Diatone "ET" 120 frames running "supposedly" fragile DYS motors with a stated 2S limit but here on 3S.  OK, only 4.2v above limit, rather than 4-6S 8.4v.

Have a number of flying wings with ultra cheap Suppo 2212-6T motors running props larger in both pitch and diameter than all internet info and comment suggests is possible. YEARS use, no issues.

BTW, its an absolute bar steward to get access to, those pathetically dim side LED housings may help stop crud entering, but are a significant barrier to maintenance/investigation.

I note the new Mk2 version is similarly getting rave reviews, but yet again no review so far has even mentioned flight duration, and my questions have been unanswered, so there's no way I'd go there.

SO frustrated with this thing, and as its unusable as of now with 2 mins duration and the low volt alarm set as all my quads screaming every time the throttle is used if flown as I want (and I fly other quads like all the time), I'm right on the cusp of just going to throw a 6S on it and see what happens.

@SnowLeopardFPV, have you met anything like this lack of flight time before?  If it was fitted "by mistake" with 6S motors, would this give what I have??

Update - had a spare half hour so took bull by horns and with no changes at all have just hovered it for a minute plus with quite a few throttle twitches power pumps, drops and sudden higher throttle recovery back to hover in back garden (all I can do here). This on a 1350mAh 100/200C 6S as used on my GEPRC Mk5, which powers it for 7 minutes or so with no throttle management needed.

No signs of any issues. (Other than 6S connector "splash" on connection!). Obviously better throttle response, handling such as I could give it seemed the same.

Motors started at 17C through being in a heated room overnight and barely got warmer, 19C.

BUT........... battery voltage after recovery time had dropped to 3.99/4.00 per cell.

Will have to wait into next week now for a more effective flight test.

Further Update as flew it at field today.

I know its quite cool over here ATM, (actually a mild day after our recent snow and sub zero period, sunny and 13C, not even any dew!) but the motors were coming down with only the slightest temp to them.

I ran three packs, getting more aggressive each time. Managed 5 minutes freestyle with included high speed runs, power loops and reversals. (on a 1350mAh 100C 6S)

NO issues, and not using any throttle limits, no Betaflight changes.

Maybe these unlabelled sold as 4S motors are 6S as suspected!

Going to be months before the ambient temp will provide a real test though.

Yeah, even with the temperatures rising slightly it's just not pleasant going out to fly in the UK right now. The place I fly will still be mostly waterlogged and just a boggy mess to trudge through getting there, so it would be no fun whatsoever. I just resign myself to ~4 months of hanging up my transmitter over the winter months. The last flying session I did was back in the first week of October and I don't even bother thinking about going out during winter mainly due to the atrocious underfoot conditions. I usually start to think about venturing out again around February / March. It sounds like your area is either on high ground or just has better drainage than where I am, or maybe it just doesn't bother you being up to your ankles in mud

Are there no markings at all on the motors? If you have some other known 4S and 6S motors of the same size then doing a resistance test on the windings and comparing the measured values with the known motors should reveal if they are high or low KV motors (and thus manufactured as 4S or 6S motors).

iFlight apparantly decided that completely unmarked plain black motors "were cool", so the Evoque (and I believe more in their range) have no writing whatsoever on them. Cretins springs to mind when they sell differing kV versions!!

With regards the cold, despite increasing old age, I do try to fly whenever possible, and have never taken any winter break period. Been around RC since 1971/72.

Our site is 400 feet altitude, accessed from a lane significantly lower, but even near the top of the rough track (stony clay with a LOT of large flints) and our patch can get pretty wet at times, and the lane access, despite being a busy commuter rat run, is a bad surface prone to flooding and sudden potholing hidden by the water. Lethal for cyclists. Its right on the edge just inside Surrey (Tandridge) while 1/4 mile towards home the lane is Croydon. Surrey are completely useless, Croydon used to be good, but have gone insolvent, so nothing is being done by them either now.

In a former life I was (as well as a full time job in engineering) a Royal Yachting Association Windsurfing Race Instructor for a decade plus out of 27 years total (mostly junior females for training towards future Olympics standard), and our general rule was if it was 10C and sunny, it was bearable, though immersing yourself and deliberately breaking the neck, cuff and ankle seals on the semi-dry suit to let that first flush of icy water in to be trapped and warmed wasn't fun. Also I could never wear gloves, I got cramp from squeezing the neoprene, so my hands suffered.

RC flying is by comparison a softy sport, though my "old git" status is slowly taking its toll !!!

It does sound like your location is slightly more bearable in poor weather. I haven't visited my flying site this winter, but you can see how it was a couple of years ago in another post HERE and it was the same last year so I have no reason to believe it will be any different this year either. Most of the area is just churned up mud like in the photo. Maybe I will put on my wellies and take a walk out there sometime this week just to see what it's like, but aside from your boots and trousers getting completey caked in sticky mud, it's also no fun trying to find somewhere clean to lay down your gear. Finding somewhere to take off / land from that is also a challenge or impossible, and the possibility of crashing in that gunk is not even something you want to contemplate  I just find myself other things to keep busy with over the winter months.

I don't have far to walk luckily, our pits area is right behind the pilots stand and guard fence, 10 metres max.

We did have lots of pit tables but the vandals burned them all, so I now take a folding one. I take off and land on an old bathroom mat.

Wow, yes, that does look terminally bad! No desire to fall or land in that!

Since I went from FrSky to ELRS, I have had none of the unexplained previous falls from sky into terrain (yes, I KNOW this is fatal to say!), ones that my flying buddy still suffers pretty much every session at least once and randomly across at least one of this three quads. (and he still insists its not the transmitter)

Our main problem with keeping the parking and access from being chewed up is that we share site with Airsoft, and they are highly skilled at being Neanderthals and FUBARing anything nice.

Even the farmer has had to deep plough up the edge of the field he'd just sown to try to force them not to randomly drive all over his budding crops. The first session they had after he did that in November some of them drove a4x4 back and fore, flattened out an access to drive diagonally right across the field while others drove around three long sides of the field, both chewing up new crop. Beats us how he still allows them on after all this, and he knew when he allowed them that they had been thrown off their previous location for similar reasons. He must REALLY need their money!

They bitch about not having enough parking but allow their punters to park in a parallel line along the hedge rather than in echelon, when they'd get twice as many cars in the space. Then they block our pits access.

We've tried to be reasonable partners but their single brain cell each isn't up to the task. We only hope someone will slip live explosive ammo into their toy guns..............very soon would be good for us.

Updating, its of course been "quite chilly" and I have even had to button up my dinner jacket (Goons reference, if too young look up "Gad, its hot, an Englishmans just unbuttoned his dinner jacket".

The supposedly 4S Evoque happily runs 6S with no mods at all, though its duration is still the worst of all my 5" quads. The GEPRC Mk5 is as good as the same weight yet manages around TWO MINUTES more flight time. If I knew why I'd fix it!

Airsoft continue to amaze. The farmer sowed new grass, they drove randomly all over it, some getting stuck deep up to axles towed out by others, so huge deep tracks everywhere. He ploughed all round the edge to stop them, they "rebuilt" earth smoothed bridges to get across. And then got stuck everywhere again, and again. A large area of his quite costly grass crop is now completely trashed and so chewed up it won't be mowable for hay. Staggers me he hasn't thown them off, their rent payment cannot be THAT good. They have been chewing up our pits area, too. I can get my normal FWD estate in and out without wheelspin, they all have 4x4s yet can't??

The public road access past the gate now looks like a Ukranian village after the Russian tanks have been through a few times, there's even a couple of burnt areas from dumped stolen cars being torched. Surrey Council website map showing numerous pothole issues raised by people, then a fair number shown as "issues fixed", with NO evidence on site of ANY action having resulted. Where is THAT money going then?

I have flown at the field five times this year so far, about the same number of times I have managed around my garden, lowest for many years.