Delanne Tandem Wing Project
- Thread starter synjin
- Start date
leaded50
Legendary member
just an extra note on tandems... here is someabout that planemodel (even called canards even if not adjustable), noted as:
"Future Star is a Tandem-Wing / Lifting Body aircraft, with very unique characteristics. It is inherently stable, and can recover from any attitude by itself in about 2-3 seconds, without need for a flight stabilization system.
It can fly Hands-off, and is easy to keep in the air, requiring very little effort from the pilot.
It can simply be steered around the sky with the Aileron control, like an RC car.
It will resist excessive bank and pitch angles. If you ask it to, it will execute rolls, and other aerobatic maneuvers. When you want to stop, all you have to do is let go of the controls, set the throttle to about 50%, and the aircraft will recover on it's own to straight and level flight."
And a video explanation eg on the plane.
"Future Star is a Tandem-Wing / Lifting Body aircraft, with very unique characteristics. It is inherently stable, and can recover from any attitude by itself in about 2-3 seconds, without need for a flight stabilization system.
It can fly Hands-off, and is easy to keep in the air, requiring very little effort from the pilot.
It can simply be steered around the sky with the Aileron control, like an RC car.
It will resist excessive bank and pitch angles. If you ask it to, it will execute rolls, and other aerobatic maneuvers. When you want to stop, all you have to do is let go of the controls, set the throttle to about 50%, and the aircraft will recover on it's own to straight and level flight."
And a video explanation eg on the plane.
leaded50
Legendary member
a the elevons too little responsive? Thats also one thing tandems easy can have problems with... they need "big" control surfaces for good reaction by slower speed.
synjin
Elite member
synjin
Elite member
The DL-2T-Ex, pre-maiden flight. I think I placed the nose gear too far back, but we’ll see. 45 inch front wingspan, two 2212 930kV motors, and 9x4.5x3 props. I’ll start it on a 2200maH 3S and see how that goes.
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Monte.C
...
Beautiful.
synjin
Elite member
So...it jumped off the ground but needed a lot of up elevator. Flew it for a bit, but while I was trying to trim it out I lost orientation and had a...high angle landing out across the field. I didn't even get to try the differential thrust! Looking, I thought I'd killed it. Turns out there are little crimps on the wing tips, and since it was cold both props are toast. Not sure the 9 inch props were just the thing anyway. I wonder whether 10 inch 4 bladed props are too big for the 2212 930kV motors (Have a bunch of those.)?
It's going to need more reflex in the elevons. The elevons might need to be a bit bigger, or perhaps wider at the rear wingtips. I'll sort things tonight and give it a go tomorrow, weather permitting.
It's going to need more reflex in the elevons. The elevons might need to be a bit bigger, or perhaps wider at the rear wingtips. I'll sort things tonight and give it a go tomorrow, weather permitting.
synjin
Elite member
Fixed it, put on 10x4.5 props. It behaved badly...very badly, like it was tail heavy. I kind of wonder if the slow fly props where also part of the problem. It tracked nicely with the 9x4.5x3 props before I lost track of it. Needless to say, tail heavy planes fly once. It now needs a new nose and wingtips.
I think I can cut off the old and scarf in new wing tips. I'll also cut off the nose and put on a new one. This will give me a chance to move the nose wheel out about 3 inches. Of course, if I'm doing all of that I may change out the low kV motors for higher kV ones, like 1800kV and run 6x4x3 props. If I have 8x6x3 props, which I think I remember buying for something else, perhaps 1400kV motors.
It's a work in progress.
I think I can cut off the old and scarf in new wing tips. I'll also cut off the nose and put on a new one. This will give me a chance to move the nose wheel out about 3 inches. Of course, if I'm doing all of that I may change out the low kV motors for higher kV ones, like 1800kV and run 6x4x3 props. If I have 8x6x3 props, which I think I remember buying for something else, perhaps 1400kV motors.
It's a work in progress.
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synjin
Elite member
Had time for rebuilding. New nose, new wingtip, nose gear moved forward for better stability. Turns out I have four pairs of 8x4.5x3 props, so I’m changing out the motors for 1400kV ones. Not sure that will change things, but I’m not sure I like the 930kV motors. I haven’t had a great deal of luck with with them. I may have to cut out the whole aileron on the right side and put in a new one. Hopefully, it will fly as well as it did the first time. We’ll see.
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synjin
Elite member
Flew the rebuild. It flew very badly...like crazy upside down then crunched into the ground. Why did the first flight go well and subsequent flights were terrible? The clue was in the TX.
Did a slight redesign. Moved the nacelles inboard, moved the main gear forward, put a slight dihedral into the front wing, put less dihedral into the rear wing, and increased the size of the vertical stabilizers. Checked the programming in the TX and perhaps the 10% offset in the throttle in one motor (that I don’t know how it got there) might have been a problem in earlier flight attempts.
We’ll see if it flies or dies. Though the temperature being 12 degrees tomorrow, not sure it’s a good day to fly.
Did a slight redesign. Moved the nacelles inboard, moved the main gear forward, put a slight dihedral into the front wing, put less dihedral into the rear wing, and increased the size of the vertical stabilizers. Checked the programming in the TX and perhaps the 10% offset in the throttle in one motor (that I don’t know how it got there) might have been a problem in earlier flight attempts.
We’ll see if it flies or dies. Though the temperature being 12 degrees tomorrow, not sure it’s a good day to fly.
synjin
Elite member
DL-2T Mk.II flies!!! Yay! I only ran one battery this afternoon, but it was 10 degrees out and I was freezing my backside off with the slight wind. I wanted to fly today because we’re supposed to get snow tomorrow. You know, life in the Northland.
3:40PM on a cold November afternoon.
3:40PM on a cold November afternoon.
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Matthewdupreez
Legendary member
it looks rather warm
