Official Freewing MiG-29 Fulcrum Twin 80mm Thread

[Airguardian]

So... How did you power the PM (or MKS) upgraded servos? They call for 2S lipo, not 5.1v from the BEC? i have HV servos in most of my planes, but use a 2S lipo direct to the rec'r to power them all. How did you go low voltage on other flight controls (BEC), but HV on just the elevators/tailerons? I'll be using a Spektrum 10 chl receiver and bypass the MCBe for all but the gear and lights. Sorry to keep asking the same question, but not getting it.

So far I've done the opposite. Try and switch most of an airplane's components to HV capable, and put a BEC somewhere in the system to power the LV stuff.
Example: On my Su-35, everything is powered at HV straight from a 2S LiPo, but I have a 4ch SBUS decoder where the red and black leads that plug into the rx have a BEC installed in series. This way, anything powered through that decoder will run at the BEC tension.

Alternatively, you'd need to solder a special wire harness so that the output from the battery goes through the BEC and to the aircraft, but you take a couple of leads that plug straight into the red/black wires of the servos. So the servo only sends a signal wire to the receiver. Of course, there needs to be a common ground, or otherwise the signal circuit won't close, but since the LiPo/BEC ground also plugs into the receiver, it should be fine.

[Sleepdog]

I'm powering everything, including the PM elevator servos and the TV nozzles by bypassing the stock BEC and using the Castle 20 amp BEC.

Thx...what output voltage are you setting in the Castle?

[Hugh Wiedman]

Anybody able to answer?

I'm powering everything, including the PM elevator servos and the TV nozzles by bypassing the stock BEC and using the Castle 20 amp BEC. My flying buddy has the exact same setup on his and they both have worked flawlessly since day one. I'm also using the 10 channel AS3X AR10360T RX along with a separate Hobby Eagle gyro on the TV nozzles. The ProModeler DS 150's are smooth as silk. Also upgraded the elevator control rods with the Hangar Nine titanium rods as I noticed the upgraded rods MRC sent out still could bend. Not the titanium rods! If you set up tailerons, you won't need a servo reverser with the PM servos for the elevator. If you do not, PM also sells a small suitable reverser to plug in line.

[Sleepdog]

So... How did you power the PM (or MKS) upgraded servos? They call for 2S lipo, not 5.1v from the BEC? i have HV servos in most of my planes, but use a 2S lipo direct to the rec'r to power them all. How did you go low voltage on other flight controls (BEC), but HV on just the elevators/tailerons? I'll be using a Spektrum 10 chl receiver and bypass the MCBe for all but the gear and lights. Sorry to keep asking the same question, but not getting it.

Anybody able to answer?

[Sleepdog]

I personally noticed an improvement in the handling when I moved to the ProModeler servos.

So... How did you power the PM (or MKS) upgraded servos? They call for 2S lipo, not 5.1v from the BEC? i have HV servos in most of my planes, but use a 2S lipo direct to the rec'r to power them all. How did you go low voltage on other flight controls (BEC), but HV on just the elevators/tailerons? I'll be using a Spektrum 10 chl receiver and bypass the MCBe for all but the gear and lights. Sorry to keep asking the same question, but not getting it.

[Sleepdog]

Ok, thx all ...I'll upgrade. Can't hurt, may save!

[Airguardian]

No, I had installed a couple of Corona DS-238MGs already as an upgrade from what came stock with the plane, as I didn't trust those servos to begin with for the task. And still noticed an upgrade even compared to these.

[Sleepdog]

I personally noticed an improvement in the handling when I moved to the ProModeler servos.

Yes, did you upgrade and see iimprovements from the 30g RS Mig?

[Evan D]

From the 30g servos with metal arms?

[Airguardian]

I personally noticed an improvement in the handling when I moved to the ProModeler servos.

[GliderGuy]

I was using a simple Futaba 6 ch rig and the stock BEC that came with the original non-VT MiG. I also did not have aileron / elevator mix.

To answer your question…for that bird…

6S to BEC to receiver to reverser to elevators.

Others will need to chime in for your set-up.

-GG

[Evan D]

With tailerons you don't need to worry about a reversed servo...

If I bought another I'd use the stock stuff. Maybe upgrade the elevator extensions but I would bypass most of the MCBe and take out the ribbon cables to the wings. Tailerons, crow and rudder air brakes as I have in my current one. But if it come with the reversing ESCs I might forgo the crow. I want a new RWB one but would need to sell my old grey one.

Hi Sleepdog,

My 2 cents….which I will definitely do when I buy another:
1) Install the heavier gauge wires to the taileron servos.
2) Beef up the foam area around the mains as discussed in this forum.
3) Install the MKS HV69…I use these on all my single point of failure elevator birds. Supply them with the voltage and current they are spec’d for.
4) Install RF chokes.
5) Get the CG back 5 mm aft of mark.

Have fun!

-GG

PS Discussing options: There is no reverse HV69, so you will need to rewire the internals. Or…..Install a servo reverser….or buy a servo that fits and has a reverse option. I went with a servo reverser from Futaba. Never had any issues with this reverser. Or….perhaps your radio allows setting up each servo direction individually.

https://futabausa.com/product/ubs3253/

[Sleepdog]

Thx GG! How did you power the tailerons tho. If I go 2S lipo, then everything is now 7+ volts.

[GliderGuy]

Hi Sleepdog,

My 2 cents….which I will definitely do when I buy another:
1) Install the heavier gauge wires to the taileron servos.
2) Beef up the foam area around the mains as discussed in this forum.
3) Install the MKS HV69…I use these on all my single point of failure elevator birds. Supply them with the voltage and current they are spec’d for.
4) Install RF chokes.
5) Get the CG back 5 mm aft of mark.

Have fun!

-GG

PS Discussing options: There is no reverse HV69, so you will need to rewire the internals. Or…..Install a servo reverser….or buy a servo that fits and has a reverse option. I went with a servo reverser from Futaba. Never had any issues with this reverser. Or….perhaps your radio allows setting up each servo direction individually.

https://futabausa.com/product/ubs3253/

[Sleepdog]

Ok guys...just got my Red Star Mig and ready to assemble. I've read the entire forum here (and some on RCG). Looks like MRC upgraded the elev sero to 30g (55oz-in) and beefed up pushrods. With TV, do you still think it needs MKS or Pro Modeler elev servos? And if MKS HV69, with the lower voltage requirement, can it run off the BEC (recommends 2S lipo)? I'm using a 10 channel receiver so plan to bypass flight controls directly. Does anybody know if they upgraded the servo extensions to the elevators (soon to be tailerons)?

[Airguardian]

Glad to hear that!


A gyro is not necessary per se, but the MiG would greatly benefit from it so I encourage installing one or two.
My TV settings have nothing special, just full throws with quite some expo. And they act in all the 3 axis. Simple ;)

[miroku]

Ok, so I finally came around to writing down my current radio settings (Reflecting a Taranis X9D+, OTx 2.3.10 setup), not so the actual measured travel in mm, that maybe for another day, this is time consuming...

Have to consider: Linkages are all on the factory recommended holes both in servo arms and horns and using the stock servos EXCEPT the tailerons, which I replaced to Corona DS-238MG and installed the linkage on the innermost servo arm hole.

INPUTS PAGE [First value is 'weight', second value (EXX) is the expo]
Ail 100 - E60
Ele 100 - E65
Thr 100
Rud 45 - E50 (SD UP)

60 - E50 (SD CENTER)

75 - E60 (SD DOWN)

EleT 35 - E65 (SD UP)

55 - E65 (SD CENTER)

65 - E65 (SD DOWN)

AilT 30 - E60 (SD UP)

35 - E60 (SD CENTER)

65 - E65 (SD DOWN)

MIXES PAGE [The value is the 'weight' and after comes the input that actuates on this channel. Red lines are prepared but not currently active]

CH1 100 Ail (TV-Rol - Not in use yet)
CH2 -100 Ele (TV-Pitch - Not in use yet)
CH3 100 Rud (TV-Yaw - Not in use yet)
CH4 100 SB (Gyro Mode - Not in use yet)
CH5 100 S1 (TV Gyro Gain - Not in use yet)
CH6 100 S2 (Tailerons Gyro Gain - Not in use yet)
CH7 100 AilT (Taileron LEFT)

+= 100 EleT

CH8 100 AilT (Taileron RIGHT)

+= -100 EleT

CH9 -100 Rud (Rudders)
CH10 100 Thr (Throttle)
CH11 100 AilT (Ailerons)
CH12 0 MAX FM 0--345678 (Flaps)

:= 20 MAX FM -1-------
:= 30 MAX FM --2------

CH13 -100 MAX (Landing Gear)

:= 100 MAX

CH14 -100 Rud (Wheel Steering) <-- I adjust offset here

:= -20 Rud

CH15 (Pan - Not yet in use)
CH16 (Tilt - Not yet in use)

OUTPUTS PAGE [Endpoints]

CH1 TV Rol -130/130
CH2 TV Pit -130/130
CH3 TV Yaw -130/130
CH4 GyMode -100/100
CH5 TVGain -100/100
CH6 TlGain -100/100
CH7 Tail-L -150/150
CH8 Tail-R -150/150
CH9 Rudder -100/100
CH10 THR -100/100
CH11 Ailerons -100/100
CH12 Flaps -100/100
CH13 LGear -100/100
CH14 Wheel -100/100
CH15 Pan -100/100
CH16 Tilt -100/100


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That's it for my radio setup, but here it is "translated" to something easier to grasp for implementation on other Tx:

'ENDPOINTS': All normal maximum (100%), extended 130% for TV and 150% for stabs.

Travel Limits (Triple-Rate)
ROLL 30/35/65
PITCH 35/55/65
YAW 45/60/75

Exponentials (Triple-Rate)
ROLL 60/60/65
PITCH 65/65/65
YAW 50/50/60
(Precision flight/Aerobatic flight/Aerobatics+increased roll)

DISCLAIMER: This is not a final configuration, I am still tweaking things, it's just what I currently use. I basically fly only at high rates so the mid and low rates are probably not set up 'as well'. Weights and expo apply different on different transmitter brands, so don't take the numbers at 'face value'. This setup has 'kinda limited' stab throws due to the use of the innermost servo hole on the stab servos (for servo overload concerns) AND the fact that the tailerons LE rubs with the vertical stabs, but should be 'expandable' with a few adjustments. This served me as a testbed to begin experimenting with the MiG and has worked well so far, but I don't plan on staying with this setup forever.

I will update when I settle on a more mature configuration.

I'm having fun flying with your settings.
I'm thinking of installing TV next.
Is a gyro unnecessary for TV?
Please show me your TV settings.

[Airguardian]

where would this Y connector be?

You are holding it in your hand on the pic!


Glad to see you sorted it out already, Godspeed!

[N4Speed]

I call Motion RC and talked with Tim. He asked me to disconnect the throttle from the Y-split on the side that was running and go through ESC calibration with the throttle trim all the way down. The right side started to work but now the left was not running. We tried this couple of more times and got both side running.

[Evan D]

I hate to say but I don't remember. Sorry.