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Fancherized Sig Twister

Old 07-06-2014, 11:01 AM
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Default Fancherized Sig Twister

I'm working on Fancherizeing my Sig Twister kit. Heres how far i got with it this past weekend. I figured it would be a good weekend to build something since its really windy here from that hurricane that just passed thru! I'll post some pics once i get it covered......Gene
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Old 07-06-2014, 11:22 PM
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Gene,

I did a somewhat similar mod to a SIG Banshee (essentially similar layout) a few years back. I'd read Ted's article on his mod, but decided to develop my own...

Major changes:-

As I dislike the side view, the view from the handle, of the Banshee, The fuselage was changed in appearance.

The Banshee has, clearly, too much distance from leading edge to prop, unless a very light engine or added tail weight, or both, are used. I moved the wing forward 1".

Span was changed to use the full 24" LE and TE pieces.

Outer ribs were cap stripped. New inner ribs were cut to same height as outer ribs, so that 1/16" root sheeting came out the same as the cap stripped ribs.

Flaps were changed to about 3" root chord and about 1" tip chord.

A different tip shape, of course...

Wing mounted landing gear.

Tail area (stab+elevator) were increased to about 22% of gross wing area (structure+flaps)

Original intent was to use a PAW 35 - which IS heavy. Later found I had one with an oversize choke diameter that complicated finding a flying setting. Swapped out a Brodak 40.

VERY nice flying model, and I enjoy the 'from-the-handle' view. The only difficulty is to be expected of a straight LE planform: - somewhat skittish at high line angles in strong, highly turbulent wind. Pull, feel and response all excellent and dependable if you avoid 30 MPH turbulent winds high on the circle...
Old 07-07-2014, 02:24 AM
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Lou, the Banshee is on my list to build one day. .....Gene
Old 07-07-2014, 05:21 AM
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Mine is kind of heavy for squares. Maybe needs the motor moved back to get rid of the extra tailweight, and a bigger elevator? Got it from an old flying buddy.
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Old 07-07-2014, 08:25 AM
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I like how they incorperated the pushrod inside the fuse. That took some doing......Gene
Old 07-16-2014, 12:34 PM
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aspeed,

A bit later than should be, BUT -

DON'T enlarge just the elevator! the stab and elevator should be enlarged about equally.

TOTAL tail surface area is what matters, not just the flipper.

Look at it this way: the extra total area gives you two things - more power to 'pitch' the model (larger elevator), and more power to 'recover' the model to stable straight-ahead (in the direction of flight, I mean) motion. The bigger elevator "elevates" the wing angle of attack; the bigger stabilizer "stabilizes" the model when the elevator influence is reduced to neutral.

This seems to have worked for the world champs for the past decade or so - who am I to contradict that?
Old 07-18-2014, 06:32 PM
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Originally Posted by gene6029
I like how they incorporated the pushrod inside the fuse. That took some doing......Gene
Just replaced a hinge in the plane and noticed the pushrod is outside. The rod you see in the pic is a carbon fiber rod to stiffen the fuselage.
Old 07-19-2014, 02:48 AM
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Aspeed, thanks for the clarification. I enlarged the picture and can see it now. ....Gene
Old 08-01-2014, 03:26 AM
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Well, i got the model covered with silkspan & put down several coats of clear on the wings and also several coats of clear and talc on the solid wood parts. now its sanding sanding sanding......Then primer & more sanding......Gene
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Old 08-01-2014, 03:32 AM
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Primer coat is on, back to sanding.......Gene
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Old 08-23-2014, 10:20 AM
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Finally got to shoot on some color this week. Still needs to be clear coated yet......Gene
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Old 09-04-2014, 11:39 AM
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Got the Fancherized Twister finished up today. All up RTF weight is 50 oz, a little on the fat side! Oh well. we'll see how it flies.....Gene
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Old 09-04-2014, 02:00 PM
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Nice work Gene!
Old 09-04-2014, 08:06 PM
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Looks great!

I built one of these several years ago, still have it. Powered by an OS LA40. Flies nice but to tell you the truth I have a Goldberg Shoestring that flies better and corners better without flaps. Simpler is better in my world. I think I like the Shoestring more
Old 09-05-2014, 01:32 AM
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Thanks for the comments guys. I hope it flies as well as i am told......Gene
Old 09-05-2014, 05:32 AM
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Yes, you certainly do nice work.

Jim
Old 09-05-2014, 07:49 AM
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Mine is about 47 oz. and it doesn't really do any squares either. Maybe it needs less flap? Better pilot? I'll try a, 11 - 4 prop next outing to slow it down. Edit, It is much better with an 11-4. Still kind of balks in the corners. Probably someone who knows how to trim would get that fixed easily. I will play with it more often now that I can go slower, I even went inverted after 30 years. Now I can do it on my little combat too. I wrecked a couple combats trying this before so I am happy now. I am slowing down in my oldish age.

Last edited by aspeed; 09-08-2014 at 11:35 AM.

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