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Author Topic: Multiplex EasyGlider4  (Read 496 times)
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Andy from Sandy
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« on: August 09, 2018, 09:05:18 AM »

Well after some research and thoughts from a club mate I have bought an EasyGlider 4 RR.

It was for sale new in box for a good saving on a UK specific classifieds forum.

I have gone for the Turnigy Graphene 1500mAh 3S packs that weigh 164 grams for an AUW of 1040 grams.

I have had just a few flights with beginners luck seeing it get in a thermal on the first flight.

With the mechanics as supplied I am not getting the throws described in the manual but still plenty.

With full down elevator the fuselage is pulled out of shape.

I had to adjust one of the aileron links to get the aileron centred which seemed a bit strange. It is a shame the covers are stuck in place. I don't know what damage I will do to unstick them to check the servo centres.


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Multiplex EasyGlider4
Multiplex EasyGlider4
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Konrad
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« Reply #1 on: August 09, 2018, 10:06:40 AM »

Fuselage bent out of shape sounds like a control bind issue. Please disconnect all the control linkages and flex the control surface to exercise the foam hinge.

Having to adjust linkages is a normal activity. By the way centered servos really isn't the goal. Rather it is balanced control movements. Do both ailerons go up and down the same amount? And on this glider you want more up aileron than down. Yes servo geometry plays a large part in this. Covers should peel off just fine. If concerned you can scribe around the cover with a knife prior to popping off the cover. I think they sit in a grooved pocket.  I re-attach the covers with contact cement.
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Andy from Sandy
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« Reply #2 on: August 09, 2018, 11:59:30 AM »

Exercising!

The aileron covers as shown in the picture are not stuck around the edge unfortunately.

I am used to helicopter cyclic servos where getting all servo horns in the same place is important to not getting differential of movement.

I didn't actually measure but eyeballing the travel looks about the same for both ailerons, I will check properly. Differential setup to get more up than down is done with 100% up and 40% down set in the transmitter.

Thanks,
Andy
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Re: Multiplex EasyGlider4
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Konrad
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« Reply #3 on: August 09, 2018, 03:37:57 PM »

Exercising!

The aileron covers as shown in the picture are not stuck around the edge unfortunately.
Actually these blade mounted covers are easy to remove with little damage. Just drive a blade down on the outside of the cover's mounting blade and pull up on the cover. Any damage will be light and covered by the cover.

I am used to helicopter cyclic servos where getting all servo horns in the same place is important to not getting differential of movement.
Same here, But we use actual surface deflection to insure verify surface movement, Differential.

I didn't actually measure but eyeballing the travel looks about the same for both ailerons, I will check properly. Differential setup to get more up than down is done with 100% up and 40% down set in the transmitter.
I like to use mechanical rigging as my primary  set up tool, then I use the software to fine tune the surface movements. I try to keep my servo motion as close to "plus 120%" and "minus 120%" to get the highest resolution and power from the servo. For set ups like your EasyGlider I would aim for the servo arm being pointed forward about 15°

Thanks,
Andy
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If you are happy with the way the ship is flying I wouldn't dig too deep looking for the ultimate performance. Just make sure your servo's aren't stalled and have fun.
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Andy from Sandy
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« Reply #4 on: August 10, 2018, 10:54:08 AM »

For a first time back with gliders after many years I think it flies nice.

I think it is quite neutral in flight with motor off.

It wants to climb pretty sharpish under power. Although I don't mind leaning on the elevator I have worked out the programming to mix throttle to elevator. My transmitter doesn't have trims but it does have a couple of pots one of which I have programmed to trim the elevator.

Trials hopefully in the next couple of days.

Thanks,
Andy
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Konrad
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« Reply #5 on: August 10, 2018, 11:02:47 AM »

Most of my Multiplex gliders don't do this, pich up under power. Yes they climb but don't change attitude much. I might add 4% to 6% down mix on some gliders where I have a lot of pitch speed from the prop.

Have you done the dive test to set the center of gravity? I normally do have to set the Center of Gravity aft of that stated in the manual to get the trim I want.
http://www.charlesriverrc.org/articles/supergee/CGMarkDrela.htm
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Andy from Sandy
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« Reply #6 on: August 10, 2018, 01:22:41 PM »

I have not done the dive test. I will print out the document and take with me to the field for reference.

At present the CG is set on the bumps of the wing.
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Andy from Sandy
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« Reply #7 on: September 04, 2018, 02:12:52 PM »

I took the glider to the field Monday. Although the weather didn't look very good even with my ham-fisted technique I found a couple of very good thermals and was able to ride the elevator to heaven very easily.

My mate for the day has a much lighter built up model and that went skyward very quickly in the lift.

The dive test seems to indicate the CG is quite well forward as it "zoomed" out of the dive. Unfortunately I didn't take my device for getting the pack out. Once the velcro gets a hold it is a struggle to get the pack out so I was unable to experiment. From the text it looks like I shall need to move the pack back.

In fact the model seems to always be in a slight climb even though the elevator is perfectly in line with the rest of the wing.

How does one go about checking incidence with the main wing?

It was a very pleasent day indeed. Smiley
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VictorY
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« Reply #8 on: September 04, 2018, 03:07:35 PM »

You shouldn't have to worry about decalage or wing/stab incidence with this plane. It's a classic foamy design, one of the best soaring cheap gliders ever sold. I think the aerodynamics have remained basically unchanged since the Easy Glider was first released more than a decade ago. Just center the elevator and shift the CG until you get a flat glide. You can do this with the radio off even. This is a free flight site right? Smiley
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Andy from Sandy
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« Reply #9 on: September 04, 2018, 03:22:34 PM »

I will just double check the stabiliser is seated correctly then. Certainly moving the CoG back some is my next task, thanks.

Just looking out for the next nice looking day.

I created a mix to add a little down elevator when the motor is on and it flies straight out of my hand which is nice.
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Konrad
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« Reply #10 on: September 04, 2018, 07:13:36 PM »

Multiplex has the ship set up for a beginner. So it is setup to be nose heavy that is why the incidence is "off" (Nose up trim with the elevator in profile with the stab).

Get the CofG  set so that there is very little pull up after setting up a 15° dive.  If the stab camber is too great for your eye then readjust the tail Incidence. Really the down trim will have a negligible effect on this model. Proper CofG placement is far more important.

Please be aware that as you move the CofG aft you might have to cut down on the amount of elevator throw. And in rare occations even cut down the rudder throw. Do this by moving the push rods away from the hinge line or towards the servo arm pivot (center). Try to avoid cutting down the control movement via the radio's programing.

As you get the CofG right you will need less (maybe even none) motor/elevator mix.
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Cut it twice and it's still too short!
Konrad
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« Reply #11 on: September 04, 2018, 07:28:49 PM »


...
In fact the model seems to always be in a slight climb even though the elevator is perfectly in line with the rest of the wing.

How does one go about checking incidence with the main wing?

This bothers me. You should trim the model so that it is flying level. Elevator in line means nothing as far as handling. (Yes, it has an effect as far as drag efficiency. But handling no) Once you have trimmed the plane for a hands off at a certain speed (slow) then do the dive test per Drela.

After each change in the CofG retrim for hands off flight at a low speed. And perform the dive test again. Repeat until the model is slow to pull up out of the dive.

Most of my Multiplex models are trimmed with the CofG at the aft base of the bumps or further aft by 5mm.
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Cut it twice and it's still too short!
Andy from Sandy
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« Reply #12 on: September 05, 2018, 04:24:37 AM »

Perhaps don't be too concerned just yet until I have got the CoG sorted out.

This could all be part of my lack of knowledge for glider guiding. It could be that although there is no wind on the ground it could be quite windy upstairs and the model is flying into it unknown by me so the model slows which gives the impression of a nose up attitude.

I did find it very exhilerating getting into lift. To finish I put the model into quite a steep dive and we could hear it whistle. I have looped and rolled it for good measure.

On the elevator there is quite a lot more down than up. I have used the radio programming and had to reduce the throw to 60% to get them equal. The horn might be in the wrong place but it looks to be on the hinge line but then again maybe it is very sensitive and I need to be more critical of its placement.

If the throw had been too great for sure I would move the links in or out a hole as required.
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Konrad
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« Reply #13 on: September 05, 2018, 04:37:16 PM »

I recall you saying you flew with another "Glider Guider". He should be able to help. With the CofG set properly the nose should not change attitude (much) as it goes in and out of the head wind. With a nose heavy ship the relative wind will have a large effect on the attitude of the plane.

I like to set up my planes so that the elevator has more down than up motion. This is to help get a more balanced feel from cambered wings. But needing to go down to 60% seems wrong. Is the servo arm near 90° to the control rod at neutral?
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Cut it twice and it's still too short!
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