FlyteTime
Hey guys, here's my latest project, a Ligeti Stratos. This model is based on the real Stratos designed by Charles Ligeti. It's an ultralight kit built airplane. I'm drawn to the unusual designs.

I've been wanting to build one of these for a long time. Rcfoam.com carried a kit years ago but it is discontinued. No plans were to be found as far as I could see so I decided to do a total scratch build from ground zero. This is my first plane to build without plans.

I got my dimensions from pictures and drawings from the web.

It's made of DT foam with the paper removed. The fuselage is 4 layers thick with some 3mm carbon rods in for strength and some fiberglass strips also.

Since the DT foam without the paper is so flimsy, I used two layers with a 6mm rod for a spar in the wings. The 6mm is probably overkill but it's all the long pieces of carbon I had left. Also it's hard to tell but there's a slight dihedral in the top wing. It's plenty strong and I'll have to see what the AUW is when it's done. Hopefully under 10 ounces.

Here's a few pics of the real plane and my progress so far. I have to do the wingtip joiners, and elevator and the ailerons and servos and electronics. Then we get to see if it will fly.

Updates to come soon.




ligeti stratos line drawing.png  ligeti stratos full scale.jpg  ligeti stratos1.jpg  ligeti stratos2.jpg  ligeti stratos3.jpg 
I'd rather have a bottle in front of me than a frontal lobotomy.
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Wildthing
Quote:
Hey guys, here's my latest project, a Ligeti Stratos. This model is based on the real Stratos designed by Charles Ligeti. It's an ultralight kit built airplane. I'm drawn to the unusual designs.

I've been wanting to build one of these for a long time. Rcfoam.com carried a kit years ago but it is discontinued. No plans were to be found as far as I could see so I decided to do a total scratch build from ground zero. This is my first plane to build without plans.

I got my dimensions from pictures and drawings from the web.

It's made of DT foam with the paper removed. The fuselage is 4 layers thick with some 3mm carbon rods in for strength and some fiberglass strips also.

Since the DT foam without the paper is so flimsy, I used two layers with a 6mm rod for a spar in the wings. The 6mm is probably overkill but it's all the long pieces of carbon I had left. Also it's hard to tell but there's a slight dihedral in the top wing. It's plenty strong and I'll have to see what the AUW is when it's done. Hopefully under 10 ounces.

Here's a few pics of the real plane and my progress so far. I have to do the wingtip joiners, and elevator and the ailerons and servos and electronics. Then we get to see if it will fly.

Updates to come soon.




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That looks great, well done.
Hey, which wing do you measure for the cg???
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FlyteTime
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That looks great, well done.
Hey, which wing do you measure for the cg???

Thanks Jeff. The cg is measured 2.25 inches forward of the leading edge of the top wing. You would balance it by supporting it from the bottom wing.
I'd rather have a bottle in front of me than a frontal lobotomy.
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Flybyknight22
Quote:
Hey guys, here's my latest project, a Ligeti Stratos. This model is based on the real Stratos designed by Charles Ligeti. It's an ultralight kit built airplane. I'm drawn to the unusual designs.

I've been wanting to build one of these for a long time. Rcfoam.com carried a kit years ago but it is discontinued. No plans were to be found as far as I could see so I decided to do a total scratch build from ground zero. This is my first plane to build without plans.

I got my dimensions from pictures and drawings from the web.

It's made of DT foam with the paper removed. The fuselage is 4 layers thick with some 3mm carbon rods in for strength and some fiberglass strips also.

Since the DT foam without the paper is so flimsy, I used two layers with a 6mm rod for a spar in the wings. The 6mm is probably overkill but it's all the long pieces of carbon I had left. Also it's hard to tell but there's a slight dihedral in the top wing. It's plenty strong and I'll have to see what the AUW is when it's done. Hopefully under 10 ounces.

Here's a few pics of the real plane and my progress so far. I have to do the wingtip joiners, and elevator and the ailerons and servos and electronics. Then we get to see if it will fly.

Updates to come soon.




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Flyte,..

That is PIMP!
And on the 8th day God said: "Go NAVY",.. and it was good! Pray like everything depends on God. Prepare like everything depends on you.
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FlyteTime
Thanks Fbk! Just a little more progress on her. I'm waiting on a little 25g Emax 2805 1300kv motor and some 5g servos and I'll be able to finish it out. The weight as it is now is only 172g so she's gonna come in lighter than I thought.

20170601_190911.jpg  20170601_190934.jpg  20170601_190950.jpg  20170601_191054.jpg 
I'd rather have a bottle in front of me than a frontal lobotomy.
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Wildthing
Quote:
Thanks Fbk! Just a little more progress on her. I'm waiting on a little 25g Emax 2805 1300kv motor and some 5g servos and I'll be able to finish it out. The weight as it is now is only 172g so she's gonna come in lighter than I thought.

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Wow that's light, don't sneeze in front of it. Looks great, can't wait to see it fly.
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63 nova
That plane looks really cool How do the ailerons work? Are the back ones like a elevator and the front ones for turning?
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FlyteTime
Thank you kindly nova. Actually it's the other way around. The surfaces on the top/rear wing are the ailerons and the elevators are in the front canard wing. Parts should be here tomorrow. Maiden possibly in the afternoon?
I'd rather have a bottle in front of me than a frontal lobotomy.
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FlyteTime
I maidened the Stratos this afternoon and I was unhappy with the flight characteristics. I have plenty of power with my setup but I had very little roll and pitch control. I think it might be due to the fact that the wings are double layer paperless DT foam and my elevators and ailerons are single layer hinged to the top surface of the wings. I've got a good angle of the surfaces on the top of the wing but on the bottom I don't have as much extension. I think I'll double them up and put a nice taper on the trailing edge and see if it makes it flyable.
I'd rather have a bottle in front of me than a frontal lobotomy.
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bogusbandit56
How did you get on with this model or did you set it aside?
Your control surfaces may need to be enlarged if the plane flies slowly
Another way to make the controls more responsive would be to link the control surfaces via mixes in the transmitter. Or a more simple way is having a V-Tail mix on the rear control surfaces so that they act as elevons.
I hope you didn`t crash it
Wot, no Depron?
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FlyteTime
Hey BB, yeah the Stratos got put on the back burner as I haven't been feeling well with a serious health issue I'm dealing with. I'm slowly coming back to where I was a while back with my interest level in the hobby. I love the design of the airplane and I will try again soon to give her another go. Thanks for your interest my friend.
I'd rather have a bottle in front of me than a frontal lobotomy.
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bogusbandit56
Quote:
Hey BB, yeah the Stratos got put on the back burner as I haven't been feeling well with a serious health issue I'm dealing with. I'm slowly coming back to where I was a while back with my interest level in the hobby. I love the design of the airplane and I will try again soon to give her another go. Thanks for your interest my friend.

I hope you get well soon I didn`t realize you have been so ill.
All the very best, Ian.
Wot, no Depron?
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FlyteTime
Thanks Ian for the kind words. They found some suspicious spots on my liver a few months back and I'm going for another MRI scan next week to see about the progression. But I'm still here and I'm still a flyin', .
I'd rather have a bottle in front of me than a frontal lobotomy.
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