This insn't a bad design it just has a couple of things that need to be adjusted. First off the major problem is that the center of lift (blue sphere)is ahead of the center of mass (red shpere). TO fix that you just need to add more weight forward, mostly by adding fuel near the front of the airplane. Replace the dead weight with fuel as well since you'll get extra range for the weight.
You might want to consider adding a bit more wing behind the engine, moving and/or sweeping the forward wings further back, using lighter rear landing gear in, or increasing the diameter and thickness of the propeller.
With just a little work I got it to fly, so the design is really close. And once it flies it only take a little more work to make it fly better. So stick with it.
I uploaded a successor to your design to show you what I mean. It is 99% the same as your original design and it flies and floats. Most of the changes were in shifting the wings further back, adding fuel tot he front, upping the propeller slighting, and adding buoyancy so ti would float. Less than five minutes work. You did the hard part, and built a sound design.
Your first major problem is that you center of lift is ahead of your center of mass, which makes the plane unstable and problem to going into a uncontrolled climb.
To fix: Put more weight upfront (say by adding fuel) to shift the center of weight ahead of the center of lift, and or move/add more wing further back to shift the center of lift.
Your second problem is that the plane doesn't have enough lift for the tail section, which causes the airplane to keep bouncing up and down like a roller coaster.
To fix: Increase the lift for the tail section. You can do this by angling the tail/adjusting it's dihedral to make it more horizontal, or by adding a horizontal tail secotion with stabilizers, or by moving or reshaping the the wings further back.
Fix those two things and it should fly.
Now there are some other things that you might want to adjust. For example ailerons (roll) are more effective near the out edge of the wing,but you don't have to change that.
I don't know what the rotators on the aircraft are supposed to do for it.
Here is a version with more fuel up front, and flatter tail to show you one way to make this fly.
Just what is considered a "modern" aircraft. Anything still flying? Any jet aircraft? 6th generation, 5th generation? I just like to be on the same page here?
@shahram15 I'm not all that kind. Fixing problems with other peoples designs is a great way to learn and improve your own skills, because it gives you challenges that are different from the ones you might run into with your own designs. So it is a win-win situation.
@Othawne Unrealistic, yeah probably., but fun. Besides it's a fictional plane so so don't have to worry about it. It's not like you were making a 1:1 replica.
It's a nice design, but you need to invert the trim on the front left roll aileron. Otherwise if you use trim the plane will start to bank to one side instead of raising or lowering the nose. Inverting the trim setting will make it easier to level out the trim.
Some sort of picture overlap could be nice. We could load a semi-transparent background picture for the plane and then rotate out design to the same angel and compare the shape. It would certainly help a lot with wings.
@Viper3000ad
I'm not an expert either, that's why I couldn't fix my old plane. And I agree with you that SkyFly did a good job. That's why I gave it an upvote. I'm just cautioning that sometimes lower weight isn't better for a glider.
Franky the drag from the "open" cockpit probably hurts it the most, but until SP makes transparent glass available it's unavoidable if you want to show the insides.
@Viper3000ad
Not necessarily, The weight also helps to pull the plane forward and that can give it more lift. I drove myself crazy during the last glider challenge trying to duplicate the performance of my first design, which accidentally had fuel in the wings. It wasn't just the weight but the distribution.
Nice, I love Valkyries.
One suggestion: You might want to make some tranformations "one way" to help reduce the chances of someone blowing up their plane by accidentally moving the slider in the wrong direction. That or replace some of the VTOL controls with Activate controls.
I'm sorry but I don't recall the post. I checked the threads I started where I asked about trim:
https://www.simpleplanes.com/Forums/View/836101/Fine-Tune-Control-Surfaces
and
https://www.simpleplanes.com/Forums/View/826231/Variable-Trim-Problem
But I don't see a response from you on either of those threads.
I looked through and Google search posts where we overlapped and as far as I can tell the only time you posted something towards me where I didn't respond was when you commented was in this thread: https://www.simpleplanes.com/a/gftLUg/Scythe
where you posted
"@atgxtg Hmm, high speed + detacher = wobbliness + explosions. You could just use the insta-acceleration feature and pretend it's a catapult...?"
Which I took to be rhetorical.
About the only thing that I posted about you that might have upset you was when I posted that somebody plane couldn't have been based on on of your because it had landing gear, which I meant in jest. (https://www.simpleplanes.com/a/5vT698/Spectre-II)
I'm not saying what you claim didn't happen, only that I'm not aware of it, and can't find it.
I wasn't aware of any anti-SledDriver wagon, nor did intentionally snub you or mean any disrespect. I like you designs and think you made the best SR-71 build in SP.
Sorry If anything I did bothered you in any way, I did not do so deliberately, nor do I Bear you any ill will.
@SkyHunter Glad to help. One of the reasons why I like to help with other's designs is that I get to learn stuff through problem solving.
The basic plane was pretty good, it just had a few bugs to iron out. I hope to see your next design.
This is a fun little Mig
+1This insn't a bad design it just has a couple of things that need to be adjusted. First off the major problem is that the center of lift (blue sphere)is ahead of the center of mass (red shpere). TO fix that you just need to add more weight forward, mostly by adding fuel near the front of the airplane. Replace the dead weight with fuel as well since you'll get extra range for the weight.
You might want to consider adding a bit more wing behind the engine, moving and/or sweeping the forward wings further back, using lighter rear landing gear in, or increasing the diameter and thickness of the propeller.
With just a little work I got it to fly, so the design is really close. And once it flies it only take a little more work to make it fly better. So stick with it.
I uploaded a successor to your design to show you what I mean. It is 99% the same as your original design and it flies and floats. Most of the changes were in shifting the wings further back, adding fuel tot he front, upping the propeller slighting, and adding buoyancy so ti would float. Less than five minutes work. You did the hard part, and built a sound design.
How are you defining smallest for this competition. Length? LengthxWidth? Wing Area? Number of Parts?
Yea, another Eagle!
This is kinda nice.
Nice, but it needs an air freshener
+1Nice paint job
Or you could just look at the autocredit.
@yellow8041
+1Don't be sorry, I just wanted to know what criteria to use.
I see two major problems:
Your first major problem is that you center of lift is ahead of your center of mass, which makes the plane unstable and problem to going into a uncontrolled climb.
To fix: Put more weight upfront (say by adding fuel) to shift the center of weight ahead of the center of lift, and or move/add more wing further back to shift the center of lift.
Your second problem is that the plane doesn't have enough lift for the tail section, which causes the airplane to keep bouncing up and down like a roller coaster.
To fix: Increase the lift for the tail section. You can do this by angling the tail/adjusting it's dihedral to make it more horizontal, or by adding a horizontal tail secotion with stabilizers, or by moving or reshaping the the wings further back.
Fix those two things and it should fly.
Now there are some other things that you might want to adjust. For example ailerons (roll) are more effective near the out edge of the wing,but you don't have to change that.
I don't know what the rotators on the aircraft are supposed to do for it.
Here is a version with more fuel up front, and flatter tail to show you one way to make this fly.
http://www.simpleplanes.com/a/iSVqLW/Smiliingtrios-aircraft
Just what is considered a "modern" aircraft. Anything still flying? Any jet aircraft? 6th generation, 5th generation? I just like to be on the same page here?
+1@Seungseung22 tricky.
Does it have to be able to take off? Or can it start in air?
@shahram15 I'm not exactly a beast either. But overall helping other people has benefits.
@shahram15 I'm not all that kind. Fixing problems with other peoples designs is a great way to learn and improve your own skills, because it gives you challenges that are different from the ones you might run into with your own designs. So it is a win-win situation.
@Planeacceleration You're welcome.
I missed this little gem last month. Very nice.
The bodywork in amazing. All the surfaces are so rounded and smooth.
@shahram15 Thanks for the instructions. I'll give it a try. I figured there had to be a way to get it off the ground, but I couldn't figure it out.
Nice
Sorry if I sound like an idiot here, but just how does this take off and fly? All I can get it to do is hop a bit? What am I missing?
Fun!!
@Othawne Unrealistic, yeah probably., but fun. Besides it's a fictional plane so so don't have to worry about it. It's not like you were making a 1:1 replica.
@Othawne If was new to me when I found it last night. The stall speed is incredible, and it's take off distance is very short.
An oldie but a goodie
It's a nice design, but you need to invert the trim on the front left roll aileron. Otherwise if you use trim the plane will start to bank to one side instead of raising or lowering the nose. Inverting the trim setting will make it easier to level out the trim.
@Sgtk
+1I tried out a few of your planes and liked them.
Fantastic! This really raises the bar for ornithophers in SP
Some sort of picture overlap could be nice. We could load a semi-transparent background picture for the plane and then rotate out design to the same angel and compare the shape. It would certainly help a lot with wings.
Really clever use of the catapult
+1Yes there is definitely more to this design. I'd say "efficient" is a better description than simple.
@Viper3000ad You should enter this in the No Control Surface Challenge.
@Viper3000ad I'm working on it. I keep overdoing it in the turns and get my feet wet.
Even if it didn't fly, it would be worth an upvote just for the rider. It looks like a person.
Interesting.
@Destroyerz117 Thanks for the fun spaceship to fly. It not every day I get to laser something while telling it to "bite my shiny metal a$$".
It's worth an upvote for the unusual wing/engine arrangement. I don't know if such an arrangement is practical, but it's different.
Impressive detail. It's like Futurama in 3D
@Viper3000ad
I'm not an expert either, that's why I couldn't fix my old plane. And I agree with you that SkyFly did a good job. That's why I gave it an upvote. I'm just cautioning that sometimes lower weight isn't better for a glider.
Franky the drag from the "open" cockpit probably hurts it the most, but until SP makes transparent glass available it's unavoidable if you want to show the insides.
@Viper3000ad
Not necessarily, The weight also helps to pull the plane forward and that can give it more lift. I drove myself crazy during the last glider challenge trying to duplicate the performance of my first design, which accidentally had fuel in the wings. It wasn't just the weight but the distribution.
Nice glider
1
Nice, I love Valkyries.
One suggestion: You might want to make some tranformations "one way" to help reduce the chances of someone blowing up their plane by accidentally moving the slider in the wrong direction. That or replace some of the VTOL controls with Activate controls.
I'm sorry but I don't recall the post. I checked the threads I started where I asked about trim:
https://www.simpleplanes.com/Forums/View/836101/Fine-Tune-Control-Surfaces
and
https://www.simpleplanes.com/Forums/View/826231/Variable-Trim-Problem
But I don't see a response from you on either of those threads.
I looked through and Google search posts where we overlapped and as far as I can tell the only time you posted something towards me where I didn't respond was when you commented was in this thread: https://www.simpleplanes.com/a/gftLUg/Scythe
where you posted
"@atgxtg Hmm, high speed + detacher = wobbliness + explosions. You could just use the insta-acceleration feature and pretend it's a catapult...?"
Which I took to be rhetorical.
About the only thing that I posted about you that might have upset you was when I posted that somebody plane couldn't have been based on on of your because it had landing gear, which I meant in jest. (https://www.simpleplanes.com/a/5vT698/Spectre-II)
I'm not saying what you claim didn't happen, only that I'm not aware of it, and can't find it.
I wasn't aware of any anti-SledDriver wagon, nor did intentionally snub you or mean any disrespect. I like you designs and think you made the best SR-71 build in SP.
Sorry If anything I did bothered you in any way, I did not do so deliberately, nor do I Bear you any ill will.
Nice. I Like the pilot.
It's a fun plane but you got an extra piece of landing strut on the right side
It's pretty.
Gorgeous plane. I love the way the engines glow.
What is a wake-up engine?
It's a nice concept. Giveit a skirt and some bouncy bumpers that extent lower than the blades, and you'd have a good hovercraft.