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Old Jan 16, 2008, 06:08 AM
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Mitja,
Can you post the plan untiled so that it is all on one page?
thank you
Mark
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Old Jan 16, 2008, 07:40 AM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by kram242
Mitja,
Can you post the plan untiled so that it is all on one page?
thank you
Mark
Yes! Here it is!

Mitja
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Old Jan 16, 2008, 08:16 AM
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Thanks!!!
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Old Jan 17, 2008, 05:00 AM
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Ljubljana Brnik, Slovenia
Joined Sep 2004
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There are already some ULTRON`s build by this set of plans, that I publish in megazine (previously mentioned TIM Magazine), so here are some pictures:

http://forum.modelarji.com/datoteke/...800600_111.jpg

http://forum.modelarji.com/datoteke/img070_195.jpg

http://forum.modelarji.com/datoteke/rajko2_191.jpg

http://forum.modelarji.com/datoteke/robi3_884.jpg

http://forum.modelarji.com/datoteke/...7_2229_157.jpg
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Old Jan 22, 2008, 08:52 PM
dumbthumb
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World's Ass - Chile
Joined Dec 2004
357 Posts
Ive started to build an Ultron. I picked coroplast 3mm (6mm for A&R) instead of depron, just because I got it at hand. Ive done another 3D before with depron (RIP); Id never work bf with coro, lot to learn.

Ill try to figure out one servo wing; I started to think on it since my gws pico rx its only 4 ch. Anyway, I dont see why 2 servo wings on a 3D, if any can explain maybe Im missing something... More power..?
Pics soon.
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Old Jan 23, 2008, 01:33 AM
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Quote:
Originally Posted by aleXtino
Ive started to build an Ultron. I picked coroplast 3mm (6mm for A&R) instead of depron, just because I got it at hand. Ive done another 3D before with depron (RIP); Id never work bf with coro, lot to learn.

Ill try to figure out one servo wing; I started to think on it since my gws pico rx its only 4 ch. Anyway, I dont see why 2 servo wings on a 3D, if any can explain maybe Im missing something... More power..?
Pics soon.
As first, I must tell you that This model if build from Coroplast will never fly well as 3D aerobat. It will be simply to heavy to perform well and at low flying speeds. Also, you can kiss godbye the howering ability.

But if you prefer faster flying and "conventional" aerobatics, then it will be good, but you must keep contrill throws inside reasonable values. (lower that for 3D aerobatics)

regarding 2 servos in the wing, there are here because you can use mixing ability of your RC transmitter, and simultaneously rise or lower both ailerons in some aerobatic figures. Raising both ailerons simultaneously, can somethimes help to perform stabiler harrier for instance...

Best wishes for building of your Ultron. Pleas post some photos of your progress.

Mitja
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Old Jan 27, 2008, 01:29 AM
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Ljubljana Brnik, Slovenia
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Couple of last days was really nice for flying, so I made some flights with my Ultron and open my 2008 fligt season!

Here is a VIDEO:
Relaxing flying (9 min 59 sec)

I am still a bit rusty, but I hope that some further practising will make me fly better.

Regards!


Mitja
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Old Jan 28, 2008, 08:59 PM
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I love the model. You mentioned early in the thread that you were working on a builder's manual. Is that available?
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Old Jan 31, 2008, 05:16 AM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by 7ECflyer
I love the model. You mentioned early in the thread that you were working on a builder's manual. Is that available?
Sorry, not yet. Lack of spare time dont allow me at this moment to make it.

But there is no hard thing that one cant do.

So shortly:

It is basically like other common foammies.

The main diffenernce at Ultron is that wings are joined by a wing joiner made from 6 mm depron, capped with a carbon strip top&bottom, to achieve proper bending strength. At assembly, wing halves are joined permanently using glue.

For bending wing skin, I tape a decorative self adhesifve tape on the profile nose area, prior bending it.
At line of the sharp nose profile bend, i use razor knife to cut shallow V groove on the inside side of depron. This allow depron to bend sharp over the airfoil nose without breaking.

First third of wing skin is bended and I bend it using a piece of aluminum tube, and press&roll it over inside side of depron. Wgen depron gets allmost proper curvature, the bending is finished.

ESC and reciever are attached to the model with self adhesive tape, but battery is attached with Velcro tape, to be removable.

I made pull pull controlls for the elevator and ruder. I use common thread and after setting proper length and tension, I drag a drop of CA glue over threads to harden pull pull system in order not to streech under tension.

The ailerons controlls are done by bending a 1 mm thick steel wire in Z manner both ends and connect them with servo horn and aileron horn.

Controll surfaces horns can be made from CD plate material, thin plywood, expired credit card material, or phenolic plate...


Mitja
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Old Apr 04, 2008, 02:36 AM
Parkesflyer
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United Kingdom, Ryde
Joined May 2006
789 Posts
Mitja - I built a Katana using a built up thick section wing very similar to your Ultron concept. I was not convinced that the aerofoil section was any better than a flat plate wing - it was heavier because of the ineternals and lots of glue. I think that at Reynolds numbers lower than 100,000 a flat plate is actually better.

have you read:

http://jef.raskincenter.org/published/airfoil.html

... an interesting article that made me consider changing some old design principals

I am currently building an EPP version of your Ultron with a 6mm EPP flat wing and tailplane, and 3mm EPP fusalage sides. I have worked out that it will weigh 9oz with a 45gm motor which will give a wing loading of 3oz/sqft.

I am hoping that this combination with your very large moving surfaces will provide a great 3D machine. Your design looks great - I will let you know how my EPP version flies

Richard
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Old Apr 06, 2008, 01:07 AM
Parkesflyer
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United Kingdom, Ryde
Joined May 2006
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c of g

Mitja - if the assembly sketch is 1/5 scale then I calculate that you have your centre of gravity 84mm behind the leading edge of the wing - is this correct ?

For 10% static margin I calculate that it should be 101mm from the root leading edge which would improve its 3D capability - you have been flying it what do you think ?

Richard
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Old May 25, 2008, 02:01 PM
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Hi Mitja and all,

After the gupy, here is my Ultron. I'm clearly not a 3D specialist. However, I can say that the general flying characteristics of this plane are very good! The plane can fly very slowly even if mine is heavy (460g). The command are powerful and the rolling speed is crazy.

Battery : LiPo 11,1V - 1450 mAh - 25C (135g)
Motor : Hype E-Motor Alpha AL28/1250M (58g)
Propeller : 9 x 4
controller : Castel Creations Thunderbirds 18A (17g)
Receiver : R16SCAN (17g)
Servos : Hitec HR55 (9g)
total weight: 460g.

Once again, many thanks for sharing your plans.

more details on my website
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Old Jun 11, 2008, 12:04 AM
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Malaysia
Joined Apr 2006
466 Posts
i m building it real soon. thanks for the plane.

can show me some idea on how to install the landing wheel?
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Old Jun 24, 2008, 09:49 AM
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Joined Apr 2008
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Ultron with on-board camera

Here are some pictures of my Ultron with an on board camera.

Ultron: electric 3D RC plane in Belgium (4 min 30 sec)


For more details:

http://www.lumay.be/index.php?mainMe...project=Ultron
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Old Jun 26, 2008, 05:58 AM
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Estonia
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216 Posts
Thanks for the plans, very nice design indeed.
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