Official Freewing MiG-29 Fulcrum Twin 80mm Thread

[nuts-n-volts]

Go get em' Ghost!!

[radfordc]

[Ironside]

That will work Pat. Thanks for the heads up.

Good to know Hugh. Thanks!

[Hugh Wiedman]

Ironside if you can't get them printed for you, MRC has a few of those left in stock (6 I believe) and they are wing tip skids, SKU:DUB991 made my DuBro. Hangar Nine also used to make those in various sizes that I've used before and I think you can still get them on Ebay.

[crxmanpat]

Anyone have the ability to draw and print a couple of these "exhaust skids" for me? Looking to install a couple on my Mig. PM me if you willing to help me out.

Why not just buy some Dubro wingtip skids (which are what's pictured)? https://www.motionrc.com/products/du...20974166376561

Another option would be if someone has a set of the vectored thrust skids that they aren't using because of a crash or some other reason.

These would not work as skids. The plastic is very thin and would scrape off the first time you dragged the tail. The Dubro skids are thick nylon and would stand up to several scrapes.

[Ironside]

Anyone have the ability to draw and print a couple of these "exhaust skids" for me? Looking to install a couple on my Mig. PM me if you willing to help me out.


Another option would be if someone has a set of the vectored thrust skids that they aren't using because of a crash or some other reason.

[Evan D]

We had a pilot lose control of his over the weekend (he also lost his F-22 so it was a very bad day for him). During flight he lost pitch control with the plane having and holding a full up pitch attitude. At the crash scene he found both elevator servos locked full up. Not to second guess anything else but I assume he had both servos going to the MCBe as he typically built things by the book. Sounds similar?

Thanks for the suggestion.
I actually changed the wiring to powerbox cable before the maiden. I’m also using savox servos which on 7.4V put out 15kg of torque. (To be fair as they’re only running at 5.1V it will be much less, but far more than the stock, even upgraded stock ones which are rated at 4.5kg)

Curious that both servos would do anything odd at exactly the same time.

[kallend]

Curious that both servos would do anything odd at exactly the same time.

Indeed! Suggests some kind of power anomaly or radio glitch that affected both.

[Turbinefancy]

Looking back

Beautiful scheme, excellent work!

[Birdseed]

15-20mm here too.




That's weird indeed. Maybe a gyro issue?
Another thing that comes to mind: Defective wiring somewhere, causing intermittent shorts.
I'd replace the stab wiring by some better, higher gauge leads, and take the opportunity to take the servos out and inspect them up close. The wires in particular. It is a known issue with Freewing that they sometimes clip the wires during factory installation which can lead to problems like this.



I wouldn't do that... You will load the stabs further, the opposite of what you want.



Remember to 'decouple' the circuits, there shouldn't be any red wires running between the receiver and the bluebox if both are powered separately at different voltages!

Thanks for the suggestion.
I actually changed the wiring to powerbox cable before the maiden. I’m also using savox servos which on 7.4V put out 15kg of torque. (To be fair as they’re only running at 5.1V it will be much less, but far more than the stock, even upgraded stock ones which are rated at 4.5kg)

Curious that both servos would do anything odd at exactly the same time.

[t33jetman]

Looking back

[Tigerman]

It is a no brainer then remote receiver all order
Thanks guys

[Hugh Wiedman]

What the verdict on remote receiver.. I have thie.Mig 29 and to me it is an expensive model (worth every penny) I have a Spektrum AR8020T receiver in the Mig 29 but was wondering if it is worth spashiing out on a remote receiver for piece of mind just in case :. Are the satellite receivers a good idea or a waist of money. The satalite receiver I want is £50 (not sure what that us in dollars). But if it is going to save my Mig 29 it would worth every penny. What the opinion on these satalite receiver. Good or a waist of money?

I concur with Evan D and kallend I have the AR10360T receiver in my Mig 29 with the 2 main antennae going off to each side under the back battery tray and the SRXL2 remote all the way in the nose with it's 2 antennae going on a different plane and have gotten a very consistent signal with minimal frame losses. Is it absolutely necessary ??, maybe not but for about $45 US, well worth the insurance. Ferrite chokes wherever possible as well. I now always use a remote in almost every one of my EDF's. My SU-30 started out with just the AR8360T, no remotes and used to have 500 to 600 frame losses per 3:30 flight times (not acceptable-about 50 per is minute good, 100 per minute means it needs to be addressed) and occasionally several Holds (definitely heading for disaster there-must be 0) before installing a remote. With the remote, no holds and frame losses in the acceptable range. Same issues with my 2 F-18's and A-10, all with the AR637T's, initially way to may frame losses no matter where the receiver and antennae were placed, but after adding the remote it's back in line. I even added the DSMX remotes on my earlier EDF's with the now discontinued AR636 receivers in my 2 F-4's and Stinger 90 that cut the frame losses by more than half after putting them in.

Bottom line is that after installing the remote (no matter how I positioned the main receiver and it's antennae), I cut frame losses dramatically and eliminated any holds. The only EDF's I do not have a remote in is the Avanti and my F-16, only because the receiver and antennae are up front in the nose about as far from the ESC, EDF's and battery as you can get and have always had a good signal on those. The remote would only be positioned back where the interference originates from so left them out. I say add at least 1, if not 2 remotes to your Mig!

[kallend]

What the verdict on remote receiver.. I have thie.Mig 29 and to me it is an expensive model (worth every penny) I have a Spektrum AR8020T receiver in the Mig 29 but was wondering if it is worth spashiing out on a remote receiver for piece of mind just in case :. Are the satellite receivers a good idea or a waist of money. The satalite receiver I want is £50 (not sure what that us in dollars). But if it is going to save my Mig 29 it would worth every penny. What the opinion on these satalite receiver. Good or a waist of money?

The MiG has two batteries and two motors, each of which can block the 2.4GHz signal. A remote, properly placed, can ensure a clear signal path regardless of the attitude of the model. Good insurance.

[Evan D]

I almost always use them. On my Mig I have two. One in the nose and one under the right vertical stab. Good insurance.

[Tigerman]

What the verdict on remote receiver.. I have thie.Mig 29 and to me it is an expensive model (worth every penny) I have a Spektrum AR8020T receiver in the Mig 29 but was wondering if it is worth spashiing out on a remote receiver for piece of mind just in case :. Are the satellite receivers a good idea or a waist of money. The satalite receiver I want is £50 (not sure what that us in dollars). But if it is going to save my Mig 29 it would worth every penny. What the opinion on these satalite receiver. Good or a waist of money?

[GliderGuy]

Birdseed….here is a link to the heavier duty wire to run to the full flying stab servos from up front. Get the 80 cm length.

https://www.hacker-motor-shop.com/Se...0025080&p=8312

The webpage says 0.5qmm which is 20AWG.

This will help reduce any IR <voltage> drop going to the tail servos

I agree….leave the aileron and flap reflex in.

-GG

[Airguardian]

15-20mm here too.

Like GG says, better not venture further aft until you install VT to prevent nasty high alpha lock surprises.

Excellent flights as usual Airguardian!

Thanks!
Great FPV flying on your end too! :)

Some of us are slow on the sticks by nature, no playback slowdown required.

Unfortunately, there are some things that just can't be 'faked' with just being 'slow on the sticks', particularly when you get in the realm of post-stall maneuvers... wish they were, though! ;)

So the question is, is the models diving behaviour a result of a fwd CG, or am I experiencing the mig’s dreaded nose diving tendency-despite elevator servos being vastly over torqued?

That's weird indeed. Maybe a gyro issue?
Another thing that comes to mind: Defective wiring somewhere, causing intermittent shorts.
I'd replace the stab wiring by some better, higher gauge leads, and take the opportunity to take the servos out and inspect them up close. The wires in particular. It is a known issue with Freewing that they sometimes clip the wires during factory installation which can lead to problems like this.

What i will do is take the “ reflex” out of the flaps, and see how it performs.

I wouldn't do that... You will load the stabs further, the opposite of what you want.

4) Adjust my CC BEC from 5.1V to 6V
5) re install the original BEC and use that to feed the blue box to control the retracts and lights.( I undertand they take up to 5.5V whereas the servos can take 6V)

Remember to 'decouple' the circuits, there shouldn't be any red wires running between the receiver and the bluebox if both are powered separately at different voltages!

[GliderGuy]

Hi,

I know the book CG is too far forward, but I'm curious how far aft you guys have flown yours?

Thanks!

10 to 15 mm easy….maybe 20 mm aft of mark max unless you have VT installed. It gets to be a matter of deep stall/high alpha lock recovery as the CG moves aft.

-GG

[Shaun Evans]

Hi,

I know the book CG is too far forward, but I'm curious how far aft you guys have flown yours?

Thanks!