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Sig Wonder goes electric - first r/c build.

Old 01-28-2009, 06:02 AM
  #1  
Marc
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Default Sig Wonder goes electric - first r/c build.

After a 30 year modeling layoff from controlline combat, I picked up r/c flying this past summer. In the winter I had the urge to build. It's a shame that this is almost a lost art to the ARF generation because it can be a very satisfying experience. The Sig Wonder reminded me of my roots in combat. All of my supplies and equipment had been sold years ago, so I had to start from scratch. I built this model on my dining room table. (You can do this if you're single.) The Monokote was applied with a clothes iron. (I hadn't used it in years.)
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I decided to recut two plywood formers and move the firewall forward 2 1/4 inches. This turned out to be just enough to attain the correct CG with the 2150 mAh, 3-cell lipo moved all the way forward. If I build another one, I will extend 2 1/2" to 3". A Turnigy 30-Amp ESC hides beneath the battery floorboard, and the 1400 Kv Turnigy 35-30B motor tucked in the nacelle spins a Master Airscrew 8x4 prop. As best I can tell on a food scale, the flying weight is around 30 ounces (I had to weigh it in pieces) and the thrust is about the same. In the picture below, 1/16" plywood doublers can be seen where the original firewall was to be located.
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The 5 volt, 2 amp BEC powers a synthesized receiver and gives the tiny side-by-side 9-gram HXT 900 aileron servos plenty of power. Thanks for the advice, Chellie. I soldered music wire to the 2-56 pushrods so as not to make the holes in the servo arms too large.
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I'll be ready for the maiden flight when the weather gets a bit better. That's it. Aramid, the gauntlet is thrown and it's time for you to get busy and show us what you've got.

Last edited by Marc; 01-28-2009 at 07:26 AM.
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Old 01-28-2009, 10:06 AM
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Old 01-28-2009, 01:45 PM
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dascott
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Marc- congrats. Didn't understand most of your description, but than I'm not an airplane person. Sure seems you had fun doing this. Is this your XMAS present? Saw you yesterday taking pictures, at first couldn't figure out what you were doing down on your knees, but this explains it. Sure hope it flies and doesn't come in contact with any unmoveable objects. Let me know when the maiden voyage is. Your next door neighbor.
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Old 01-28-2009, 10:04 PM
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Rabbitcreekok
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Marc, that is a nice looking Sig Wonder. Hope it flies as good as it looks.

Dascott, welcome to Wattflyer. Get your neighbor, Marc to teach all he knows so you can have your own electric RC wonder soon.
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Old 01-29-2009, 01:29 AM
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The gauntlet is thrown, eh? I've been plodding along slowly; I'm a college student with no space to work, so I can only make progress when I'm home on break. Despite that, I've got my wing totally done and ready to cover. I went with the vortex wingtips, and was surprised at how easy they actually were. An hour with a wood rasp and X-Acto scoop blade was all it took. Covering them might be a bit more interesting, of course.

I ended up using standard servos - I know the HXT900s have about half the torque rating of a standard servo, so using two of them would give me just as much control authority. However, I've never managed to strip the gears of a standard servo just fiddling with it, which is a statement I can't make about the micros, so I'm comfortable with the 1.5 oz it's going to cost me.

Hopefully I'll get the fuselage done before too long, and I'll certainly let you all know how it goes. I look forward to hearing how yours flies, as well - when I asked for advice a few months ago, I was directed to a 40 amp controller and 35-36c 1100kv motor; that's 60% more power than your combo. Then again, the $20 isn't an issue, and there's only a 1-oz weight difference. The nice thing about electrics is that extra power doesn't really hurt your efficiency if you don't use it.

Did you change the overall fuselage length, or did you just push the firewall forward within the length of the plans? I've got a feeling I'm going to want to do the same thing, even if I decide to go with the heavier motor and ESC.

Anyway, that's a nice looking plane. And I'm glad someone else is doing it first, so I don't have to find out too much by trial and error.
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Old 03-28-2009, 02:45 PM
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looks good.how does it fly compared to a wonder with a .15?
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Old 03-29-2009, 02:43 AM
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Marc
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Welcome to the forum, p47tbolt. The weather here in east Texas has been windy all winter and sometimes rainy. Until this fall I had a very nice flying field next to my home, but now there is a 200 ft. wireless internet tower in that horse pasture. I will have to use an alternate flying site a few miles away.

I expect that the Wonder will fly okay, but with a bit less power than with the .15 nitro engine. I'm currently building a Sig Little Extra for electric conversion which will have a Turnigy SK 35-30 motor with around 350+ watts. The SK series has much stronger magnets, and Hobbycity currently has them on sale. This one will be seriously overpowered, but I may eventually swap motors with the Wonder. Anyway, welcome to the forum. How about a post telling us what you fly?
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Old 09-08-2011, 06:46 PM
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My Wonder is one of my favorite planes.

gb

[media]http://www.youtube.com/watch?v=yfMPKPJQO7w[/media]

http://www.youtube.com/watch?v=fznpa...eature=related
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Old 01-15-2012, 08:20 PM
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Default Wundere Sequitere: Twin Sig Wonder

A skillful friend built this version of the Sig Wonder.

[media]http://www.youtube.com/watch?v=RwIUZe7rueM[/media]
[media]http://www.youtube.com/watch?v=qhYE9EwXfx4[/media]

gb
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Old 01-22-2012, 06:26 PM
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The Twin Wonder is great - got any shots of the underside and how the nacelles are attached, etc?

D
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Old 01-22-2012, 07:29 PM
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Default Underside

Here you go. I have passed along to the builder your request for more information. BTW, he is seriously considering building a Wonder X2. That would give it a wingspan of ~74"

gb
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Old 01-24-2012, 07:25 AM
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Jim asked me to pass along:

The two outside fuses are bolted to the tail so then can be removed if necessary. There are battery hatches in front on each fuse. My original wonder, a single, now has a permanent wing with hatches underneath the fuse for access. This would be a change I would make to the twin also.
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Old 01-27-2012, 06:04 PM
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Thank you for getting those photos - it's a cute model. The thought of a 2X is awesome - would it be electric also?

The Wonder electrocution goes back a long way. Not sure where the article is 'hidden', but it was a very early conversion in the overall scheme of things. Someone did it by packing a nicad battery into the fuselage and using a geared ferrite motor many years ago - well back into the 'last century'. Sorry - was unable to dig up any more on that one, but it would show how far we've moved on in our hobby.

Whatever. The Wonder is a great little model. A rare one indeed - halfway between a 'conventional' model and a tailless flying wing type.

Regards

Dereck
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