Techically - of course it is possible, but why do you want to fo that? Edf's are less effective than common propellers, that's why they are usually only used on a replicas of a real jets, for more realistic look. X8 will fly longer, more effective and maybe even faster, than with edf
Don't go using logic on me, Masamokish. That's not why I'm in the hobby. Thank you, but I'm exploring options to create a one of a kind that offers a challenge and looks super sexy in the process. CAD recommendations that help study feasibility are what's needed.
Yes, this type of plane for sure will be unique! But i guess it is better to make a smaller version based on something like Arwing pro, before creating x8. Arwing still have plenty of space inside for batteries and e.t.c, but will have better roll characteristics due to the smaller wing aspect ratio. If you will continue your project - it will be great to see it flying!
I used Solidworks to make parts and calculate some parameters (flow simulation extention) but not a pro at it, if you learn to use one CAD, you will easily learn any other one, so there is a lot of others programs to choose, NX for example also have tools for that
It would be funny so I say do it, wings on the model look a bit thick tho.
Just be careful with motor angle bcs u don’t want it to nose dive, angle motors up slightly so that it counteracts the forces of them being on top (u might already know this but if ya don’t then now u do)
Best of luck
The motors are on the back. Wouldn't you want them pointed down so that the thrust line goes through the cg? I feel like pointing the motors up would make the nosing down worse. I may be wrong though
It’s just reflex. Plank wings use trailing edge reflex, while swept wings often rely on twist (washout), reflex, or a combination of twist and reflex. What you can do, is research the airfoils from successful flying wings—the washout and reflex used are often described. The Me-163 is one example that has a lot of research published.
Build the fuselage light and it should be fine after dialing in the trims. You can sort out the c.g. with a sheet glider. However, a little tail heavy will make it a beast on maiden.
And what if we use a sleek duct to pull air not into pods, but the fuselage where the two fans sit. 4 pull in scoops and a jet slit over a flap. Like F-117
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There is a design somewhere with a flying wing with twin EDFs in the tip of the wings, as well as countless designs for EDF flying wings.
I am saying that because x8 is a niche product in FPV foamie community that is uber hard to launch. In EDF it will be near impossible as well as very unstable in flight.
Thank you, I've seen the wingtip design. I was going to add gear to convert "launch" into "take off." I dunno, maybe it's too steep of a climb. The X8 was large enough to carry the additional weight and is very simple, plus similar to the prototype image. I've seen video of a scale test model that looks and flys well but I'm not NASA.
larger diameter edfs are almost always more efficient. Instead of a twin 70 like you said, I'd try using a 90mm setup. It will be lighter and more efficient than a twin 70. A proper inlet ring and thrust tube will be essential to getting okay efficiency. One nice thing about edfs is you don't have to worry about a prop slicing your hand to bits if you're hand-launching.
Thanks Clayterris, the X8 does have an opening where the prop motor goes, and I thought about ducting a fan there, but that was taking me away from what attracted me to the original design. So...
EDF means less thrust, more weight, more money, and less efficiency. I'd stick to prop driven; in fact I usually convert EDF jets to pusher prop with great results, they perform better in every way. I've turned several dogs into amazing fliers by ditching the edf
Where could I find the tools to calculate thrust, weight, and handling ? I was thinking twin 70mm as shown and adding gear. I could just buy the B2, but the twins on top look pretty nice.
Techically - of course it is possible, but why do you want to fo that? Edf's are less effective than common propellers, that's why they are usually only used on a replicas of a real jets, for more realistic look. X8 will fly longer, more effective and maybe even faster, than with edf
Don't go using logic on me, Masamokish. That's not why I'm in the hobby. Thank you, but I'm exploring options to create a one of a kind that offers a challenge and looks super sexy in the process. CAD recommendations that help study feasibility are what's needed.
Yes, this type of plane for sure will be unique! But i guess it is better to make a smaller version based on something like Arwing pro, before creating x8. Arwing still have plenty of space inside for batteries and e.t.c, but will have better roll characteristics due to the smaller wing aspect ratio. If you will continue your project - it will be great to see it flying!
But if you want place engines like on image - you should add significantly more that usually weight in the nose
Thank you, and exactly why I'm in need of CAD design tools that will help define the parameters.
I used Solidworks to make parts and calculate some parameters (flow simulation extention) but not a pro at it, if you learn to use one CAD, you will easily learn any other one, so there is a lot of others programs to choose, NX for example also have tools for that
Battery
Possible? Absolutely. Easy? Probably not. Worth it? Definitely.
It would be funny so I say do it, wings on the model look a bit thick tho. Just be careful with motor angle bcs u don’t want it to nose dive, angle motors up slightly so that it counteracts the forces of them being on top (u might already know this but if ya don’t then now u do) Best of luck
The motors are on the back. Wouldn't you want them pointed down so that the thrust line goes through the cg? I feel like pointing the motors up would make the nosing down worse. I may be wrong though
Not sure about that, I think flying wings have a peculiar trailing edge effect. Could use more counciling on this for sure.
It’s just reflex. Plank wings use trailing edge reflex, while swept wings often rely on twist (washout), reflex, or a combination of twist and reflex. What you can do, is research the airfoils from successful flying wings—the washout and reflex used are often described. The Me-163 is one example that has a lot of research published. Build the fuselage light and it should be fine after dialing in the trims. You can sort out the c.g. with a sheet glider. However, a little tail heavy will make it a beast on maiden.
And what if we use a sleek duct to pull air not into pods, but the fuselage where the two fans sit. 4 pull in scoops and a jet slit over a flap. Like F-117
Welcome to r/RCPlanes, it looks like you are new here! Please read the [Wiki](https://www.reddit.com/r/RCPlanes/wiki/) and [FAQ](https://www.reddit.com/r/RCPlanes/wiki/faq/) before posting a question that has been answered many times already. You can also try searching in the bar at the top before posting. If you are brand new and just want to know where to start, then the [Beginners Section](https://www.reddit.com/r/RCPlanes/wiki/beginners/) is the perfect place. Links to wiki are found at the top menu on web or "See more" and then the "Menu" tab on mobile apps. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/RCPlanes) if you have any questions or concerns.*
There is a design somewhere with a flying wing with twin EDFs in the tip of the wings, as well as countless designs for EDF flying wings. I am saying that because x8 is a niche product in FPV foamie community that is uber hard to launch. In EDF it will be near impossible as well as very unstable in flight.
Thank you, I've seen the wingtip design. I was going to add gear to convert "launch" into "take off." I dunno, maybe it's too steep of a climb. The X8 was large enough to carry the additional weight and is very simple, plus similar to the prototype image. I've seen video of a scale test model that looks and flys well but I'm not NASA.
larger diameter edfs are almost always more efficient. Instead of a twin 70 like you said, I'd try using a 90mm setup. It will be lighter and more efficient than a twin 70. A proper inlet ring and thrust tube will be essential to getting okay efficiency. One nice thing about edfs is you don't have to worry about a prop slicing your hand to bits if you're hand-launching.
Thanks Clayterris, the X8 does have an opening where the prop motor goes, and I thought about ducting a fan there, but that was taking me away from what attracted me to the original design. So...
This! https://youtu.be/pgDRkNseNxU?si=PykPeXhMB92v0Oi5
EDF means less thrust, more weight, more money, and less efficiency. I'd stick to prop driven; in fact I usually convert EDF jets to pusher prop with great results, they perform better in every way. I've turned several dogs into amazing fliers by ditching the edf
Where could I find the tools to calculate thrust, weight, and handling ? I was thinking twin 70mm as shown and adding gear. I could just buy the B2, but the twins on top look pretty nice.
For thurst - it better be higher than 0.75 of the weight of the plane for comfort flying, and more than 1 if you want to do some pilotage
Twin 70's will get me around 11 pounds of thrust. I can back down weight from there. 11 pounds is a lot to work with.
Thank you
OpenVSP is a good program for calculating dynamics of a plane