Which Aeroplane Gyros are best?
 

I am thinking of putting Aileron Gyros on a Jet (Thanks to Geoff White for putting the idea in my head) :D

Which is a good reliable Gyro? I know Geoff uses a Futaba which I assume is the GYA351?? I am using a AR9200 Evolution powerbox/RX so I have two outputs for aileron from the powerbox unit so as far as I can tell this wouldnt work with the futaba 351 Gyro as it has one aileron input/output and one flap input/output, I really dont want to y lead the JR8711 aileron servos as I want to keep them in their respective individual ports. Do you have any suggestions to a small inline gyro such as Turnigy T-380 gyro (is this gyro not upto the job?) or would it be completely the wrong thing to put two gyros in the model, one on each aileron?

Any feedback is great, not used gyros in fixed wing before so it's new to me :D


Thanks in advance

RE: Which Aeroplane Gyros are best?
 

ACT gyros are usually top of the recommendation list but I haven't used them myself.

http://www.acteurope.de/html/fuzzy_smm_jet.html

RE: Which Aeroplane Gyros are best?
 

Happy with the GYA 351 in a Fei Bao MiG-21.
TP.

RE: Which Aeroplane Gyros are best?
 

ACT. twin in and out, but you will need a control channel

Dave

RE: Which Aeroplane Gyros are best?
 

I use a GY401 on yaw in my flash...more of a experiment than anything...

I know of atleast one person that uses a gyro on ONE aileron and it works perfectly, far as I can see you dont really need it on both anyway. You should be able to find a 401 cheap as the Heli guys are always "upgrading" to the next best thing....

JUST BE SURE NOT TO USE HEADING HOLD MODE!

RE: Which Aeroplane Gyros are best?
 

You can also use the act gyro with a manual gain on the unit itself, however a radio channel is advised.

Chad

RE: Which Aeroplane Gyros are best?
 

yeah, there is that too....

RE: Which Aeroplane Gyros are best?
 

Hi Steve,

Yes its a GY351 I am using in the Hunter. Slight correction, its two inputs in, two outputs out so all the differential and crow etc still works fine.
If I was to use another make, I would use ACT with no concerns as they are extensively used in Europe and I have heard no bad reports. On the contrary, I actually bought a top of the range ACT gyro([link=http://www.acteurope.de/html/flachenkreisel_airplane_gyros.html]ACT Gyro[/link]) 2-3 years ago, never got round to trying it, sold it onto a mate who is using it in his Typhoon and he reports it works brillliantly.

Both of these gyros have the ability to remotely adjust the gain or if you are short of channels then you can do it manually on the gyro itself.

Geoff.

RE: Which Aeroplane Gyros are best?
 

Hi
We used one Futaba Gyro on one aileron (the right aileron) in our Kfir and the results were very good.
but bare in your mind that if suddenly you lose the servo because any reason (like we had) the plane
began to be crazy (maybe we had that of craziness because of the plane....)and not very much stable anymore.
The plane ended his life not because of any gyro problem.
It had very bad landing, so gave up of fixing it one more time.

Best regards
Avi

RE: Which Aeroplane Gyros are best?
 

here we go again ..A gyro on ailerons will give a WRONG INPUT and crash your plane if Adverse yaw takes place = low speeds= landings.

http://en.wikipedia.org/wiki/Adverse_yaw

RE: Which Aeroplane Gyros are best?
 

I've seen a lot of people use gyros, on the ailerons, on landings, and none of them have crashed as a result of a wrong input by the gyro. Maybe they are the exception??

RE: Which Aeroplane Gyros are best?
 

Wow, really, then I guess I better take the gyros off my turbines that I have been flying for the last 4 years, with extreme success and doing nothing that you claim. You need to know how to set it up and what you are doing to make it work right.

RE: Which Aeroplane Gyros are best?
 

please explain your setup

RE: Which Aeroplane Gyros are best?
 

I've tested a few of the GY401's on some of my bigger EDF's with great success. The stability I gained in the wind is remarkable. And I've had zero problems landing them afterwards. But hey if you think the sky is falling...all the power to ya.

RE: Which Aeroplane Gyros are best?
 

Without discussing the validity of this statement, one thing that is important to understand is that the amount of travel we are talking about when using a gyro on ailerons is tiny. It is not like the rudder. Just a tiny bit is enough. Definitely not enough to create adverse yaw. (and again, not argueing the validity of the statement above...)

RE: Which Aeroplane Gyros are best?
 

It all depends on the gyro as far as numbers but the idea is to keep the sensitivity low with the travel adjust, especially gyros used for heli's because you don't want to go into tail-lock, and adjust as you see how things are. That is one advantage of being able to put the gyro on a separate knob on the transmitter so your spotter can make small adjustments as you fly. I have the gyro channel programmed with the gear channel so I have more sensitivity when it is slow in landing configuration, and less sensitivity for normal flying. Unfortunately, the gyro's I use and love for airplanes is not available anymore, JR 500A. I know of others using other JR's on the ailerons and have it working well, just a little different sep-up than the 500A

RE: Which Aeroplane Gyros are best?
 

...I have considered putting the futaba gy351aileron gyro on my AW hawk ,
when speaking toGeoff W. herecomended I use one..Iuse gyros every day on my helis .......
my only concern is the heading hold mode !! if it gets turned on by accident then CRASH for sure !....
heading hold is not needed for fixed wing ,are there any wing gyros out there that dont have heading hold ?

RE: Which Aeroplane Gyros are best?
 

Gy351 all the way.
I have used allot of these units over the years, and have found it to be the most accurate and reliable gyro out there. I used an ACT some years ago and found it drifted ever so slightly.
I set mine up on a 3 position switch with the heading hold ( AVCS) value being 0% so there is no chance of me ever activating that mode. I tend to find that the 351's run quite high value's on ailerons. About 90% + seems normal.
I start at 85%. Take off with gyro off and then switch it in on a straight and level pass, to make sure I get no hunting ( Ailerons bouncing back and forth) I then roll one way, and then the other with as sudden a stop as possible. Again I am looking for hunting from the gyro. I then keep raising the gyro gain rate till I get the model to hunt just a little. I can then lower the gain value 2 or 3% Job done. I never have to touch it again after that.
Flying in heading hold does not necessarily lead to a crash, but it sure is weird. Airworld Hawks are a plane that noticeable benefits from an aileron gyro, you will really appreciate the difference. Some models dont really need a gyro as they are really locked in on all controls, where as others I just wont fly without one. The model itself may fly really well without, but when you get a chance to step back and actually watch the model fly ( Not always possible when you are focused on flying it ) you get to appreciate how much they actually move and fidget in flight. Compare this to the full size that we are trying to replicate and it looks cack. An aileron/ rudder ( I have yet to find a jet that needs one on pitch) really helps sort this out, improve the look of the flight, which in turn makes the entire flying experience that much more enjoyable.
Regards Al

RE: Which Aeroplane Gyros are best?
 

This is simply not correct

We have sucessfully flown 6 very different jets with gyros on ailerons and we have substantially improved the slow speed handling in particular with them.

Adverse yaw is much more likely to be caused by aileron differential not being set up correctly. Obviously the gyro has to be set up correctly.

John

RE: Which Aeroplane Gyros are best?
 

Futaba Makes 3 airplane gyros the GY350,351 and 352. The 352 will do 2 axises. they can be found at KEI-MOID it think. Good luck!!! And they do work.

RE: Which Aeroplane Gyros are best?
 

Keep it simple, Aileron for roll control, and rudder for yawhttp://www.rcuniverse.com/forum/js/f...ular_smile.gif

RE: Which Aeroplane Gyros are best?
 

Couldn't of put it better Ali.

After being septical of the use of Gyros, I was persuaded by Steve Elias to try a 351 in my Hunter and I never fly with it turned off now as it sooo enhances the scale illusion. My only criticism is that even though I have taken out all the expo from the ailerons, it still feels slightly dead around the centre, like I am running a lot of expo funnily enough. Is this your experience?

Geoff.

RE: Which Aeroplane Gyros are best?
 

A gyro like GY351 with twice in / twice out should be pluged directly on receiver channels (one by aileron), then out of gyro go to the powerbox "in" (one channel by aileron) and ailerons servos pluged to the "out" of powerbox.

Doing that way gyro are feed with 5 volts even if your ailerons servos are 7.4 volts regulated type.

Hope that helps.

RE: Which Aeroplane Gyros are best?
 

So do we know what Adverse yaw is??=

-we try to roll right but wing rolls left so we going to correct with more right aileron!?!??

-BUT this right aileron causes the wing to roll MORE to the left !=causing a crash??


What a gyro would do in the wing rolls left? It will give right aileron all the way AND "THIS IS SIMPLY NOT CORRECT" unless you are ready for a knife or rolling harrier.

The way out of an adverse yaw is rudder towards the wing that goes up. This way we increase the speed of the falling wing in the air and decrees the speed of the "high" wing in the air correcting them to the same level!

...



My advise is ..bin the aileron gyro and fly more to learn your model.

If you experience need for deferent aileron trims while speed change or wing rocking then you need to check your wings incidence , the lateral balance of your model and your
aileron and flap servos set ups.Years ago Ali told me to use servos with minimum gear slop and that helps too.



Guys don't want to offend anybody,just try to make you see a big mistake surviving over the years and save your plane.

I dont see my self as an expert but a lerner for a life.And "lots of people" /"many years" teach me nothing. Anything better?

IMHO Adverse yaw + aileron gyro = disaster


p.s. sorry for my poor english

RE: Which Aeroplane Gyros are best?
 

The gyro is plugged into both ailerons and acts on both ailerons at the same time. If there is an uncommanded movement of the wing the gyro will immediately act to act in an opposite direction on both ailerons. It makes for very nice scale like flying, the complete opposite of what you are saying.

John