1/3.3 Ventus 3

[ARUP]

You are the 'Bag Man' !!! Why did you choose the 1/3.3 scale?

[French1]

Mike, I didn’t picked the scale, it comes from my Graupner discus fuselage.

[ARUP]

Thanks Stephane! I didn't realize the fuselage was a kit version.

[French1]

upper surfaces are done, quite a lot of work remain for the spar, wires and so on, but definitively making progress...

Sans titre by steffruelle, sur Flickr

Here why I use peel ply, TE is quite glossy after bagging, it let the finish with a lot of potential grip after removing the peel ply

Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr


I will pause a bit on that project, I have a set of DG-200 wings to bag for a friend

[Stew2]

Stephane,

Of course the wing looks fantastic and it sure makes me want to learn this whole process!! Thanks for sharing the steps. I have a question unrelated to construction though. How many flaps and ailerons does this wing have? How many servos will be in each wing? With the sweep angle breaks in the wing, along with the polyhedral breaks, it seems like any surfaces being driven by an adjacent one through a rib pin will be difficult and probably less precise than desired. Interesting details. Keep up the outstanding work and look forward to see it in the air.

Scot

[French1]

Motivating people to build is the master evil plan in the back of this thread.... mouahahah!!!

As far as moving surfaces, one flap hinged at the bottom and three ailerons hinged on top surface. I will try to keep the servos in this wing down to three and just move the last aileron using the second one, a bit like the Duo discus (spring and tab for the aileron to move up and not down). But I will provision a servo slot, “just in case”. I do not plan to add spoilers, with 3 moving surfaces crow should work pretty well..

[Mosquito]

Nice work Stehpane!

Tim

[French1]

Thanks Tim

[Stew2]

No Spoilers?!?!? Only 3 servos in each wing?!??!? This thing is going to be like a big free-flight model!! Ok, I'll come clean, I don't really care how many servos you have in YOUR wing, but I do care about how I am going to work MY 2 Flap, 6 aileron wing with spoilers with a DX18/20 radio. Here's the bottom line and by the way, I don't want to hijack your build thread, so if the powers to be, of which you are one, think it best to move this discussion over to a Spektrum programming thread, holler out, I'll dash it over in an instant,

But let's consider an Arcus for example, 2 flaps, 6 ailerons, 2 spoilers, rudder, elevator, tow release, retract and brake. That is 15 servos. With the desire/need to have the entire trailing edge of the wing capable of flaperon, camber, reflex and differential control, you end up with 11 primary flight controls(2 flap, 6 aileron, spoiler, rudder, elevator) on 12 servos. Here in lies the head scratcher, DX18/20 radios use the X-plus system to extend past 12 channels and do so by lowering the resolution of the extended channels and having to remove the fail-safe feature on the extended channels. Employing X-plus, knocks down the available channels for primary flight controls to 10 by using channels 11 and 12 for the X-plus extension. If my understanding of X-plus is incorrect, please help me learn the right of my wrongs and stop any false info from spreading from here.... So, what I am wondering is, what would be your suggestion and anyone else who hasn't fallen asleep reading this far as well, to layout the control configuration on said airplane with subject radio?

Thanks for the intelligence,

Scot

[French1]

Scot

I would put on 2048 resolution (ch1-10):
Elevator
Rudder
Ailerons(6)
Flaps(2)

And the following on 512 resolution (ch11-20)
Tow release
Retract
Brake
Spoiler
Flaps

If you need help let me know I can craft a program and send it to you

[Swiss1]

Just use one of these Scott!

https://www.horizonhobby.com/ar20310t-20-channel-powersafe-integrated-telemetry-receiver-p-spmar20310t

[Stew2]

Jeremy,

I don't think it is a receiver question, I think it is a programming question to know how to best deal with the reduced resolution and lack of fail safe for the X-plus channels and properly understanding the manual statement of "Do not use X-plus channels for any primary flight controls". My gut feel is that it isn't so much the resolution as it is a fail safe question.

[Mosquito]

I use the same radio on my Arcus with no problem. Your in good hands with the likes of Stehpane, Jeremy, Len and others. They know that radio well. Use your X-Plus channels for gear, tow release etc etc. That way the lower resolution doesn't matter. It will work. I do remember a time when I was setting up my 6 meter LET Ventus with an UP and GO system and I thought that same thing with my DX18. How is this going to work? I then took out a piece of paper and pencil and step by step, thought out each channel configuration and it worked out.

Tim

[French1]

After pausing for a bit here we go again

Joiner box on the menu today

First taking care of the joiner tubes, just laid up on top of selected joiner (18mm carbon rod for main and 1/2in fiberglass for the tips)

usual technique, 1.5 turn of parchment paper and 10 turns of FG 2.3Oz, work well, light and just enough gap.

Sans titre by steffruelle, sur Flickr

Then comes a bit of trigonometry calculus, Tangent is the main function I keep using from middle school ;-) this bird has 4 dihedrals, 3 of them are 2.5 degree (about 10mm elevation for 20cm length)

Joiner box is made using 5mm luan plywood, lighter than aviation ply, 4 layers cut at the right angle together.

For that the great tool to use is a reciprocating table saw, great investment.

The other great tool is the belt/drum sander that help to go FAST when you are sanding

Sans titre by steffruelle, sur Flickr

Now just a bit of positionning , next step is cutting the cores, making a jig just to be sure you have the right angle and pour epoxy...

Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr

Stéphane

[ARUP]

I like the parchment paper and glass for the joiner tubes! Once you put those boxes with tubes in the foam they stay there until you cut the wings apart after glassing... right?

[French1]

Mike, not exactly. I will cut them after gluing the tube in the box, then I will put the box in position in the wing using the joiner. all this prior bagging lower surfaces

[French1]

Back at it

First be sure that dihedral is right with the proper shims on the bench,

Sans titre by steffruelle, sur Flickr

Then Gluing the tip joiner box with a tick blend of epoxy and microspheres, a bit of painter tape to avoid bleeding epoxy everywhere

Sans titre by steffruelle, sur Flickr

That is kind of a unique wing, I found it quite pretty

Sans titre by steffruelle, sur Flickr

No bad junction before sanding just after splitting the joiner box using a saw

Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr

And finally putting in position the main joiner box and the vertical spar composed of a sandwich balsa / 6oz glass / balsa

Sans titre by steffruelle, sur Flickr

Two things missing, first I am out of microsphere so need to order some, and second need to do the other wing in order to verify dihedral on joiner box before gluing

more to come

[ARUP]

Let me guess... Jules got into the microspheres thinking it was candy! lol

[French1]

On the menu tonight is the main joiner tubes

So after opening the foam on the left wing early in the morning, I discovered that wearing a fleece might not be the right move as the static made my sweater being a wonderful dust filter!!!

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Once the two slots have been open, I positioned the two main panels on the bench with some styrofoam shims to get the requested dihedral (2.5 degree). And using the sander shaped the two joiner box to fit flush in the slots


Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr

Once this done and the vertical spar been cut, a batch of epoxy and microsphere + silica has been prepared to glue everything in place.
Just used some brick to keep it in place and squeeze the excess out...

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then just an warm nap for 8 hours, yes it is quite cold here in Michigan!

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[ARUP]

Sure... blame the fleece but methinks you have bad dandruff!

[French1]

Ready for the four panel lower surfaces

lets go cutting some spar caps ;

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my technique to store them in order to avoid then to fray

Sans titre by steffruelle, sur Flickr

Servo wire channels ready, the Mc Donalds straws are the best, just the right diameter, using some lightweight spackling , Veneer is cut and assembled using painter tape

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I wet the carbon using a roller to avoid it to fray, a CC for spreading th epoxy and vaccuum

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Good night! warm in the heating blanket, we are waiting 10in of snow for tomorrow

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[Asher Carmichael]

Very nice, Stephane

[ARUP]

I'll second what Asher said. I love my 'lectric blankey!

[French1]

Thank you guys, I have learned from watching some of you and I am more than glad sharing my practices.

Journey of the tips is over for now, just pulled the right tip of the bag this afternoon and the finish is quite good, including the rolled LE

Weight is dead on (well 1g off to be exact)

Sans titre by steffruelle, sur Flickr

Sans titre by steffruelle, sur Flickr

Really like this wing platform, so unique, a lot of back swept on this tips

I carried on the journey with the center panels, one tonight and the last one tomorrow, we should be done with the wing bagging on monday

Sans titre by steffruelle, sur Flickr