telnar1236
Elite member
Looking good, looks like it should be a good FPV platform
Looking for Ideas for 3D Printed Jets
- Thread starter telnar1236
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FlyerInStyle
Master member
is that your own design? if so, how did you design the wings? I am considering designing my own vtol/plank wing style plane 3d printed which is why I ask
Houndpup Rc
Legendary member
Yup, though as you can see it pretty small so I am hoping for a LOT of speed out of it with a 2207! 👍
Houndpup Rc
Legendary member
Yup, its my design👍 So I just used a loft from two sketches and mirrored it to make the other side, then used the split tool to make the sections.
Houndpup Rc
Legendary member
The very front is a separate part so I hope to make different nose pieces that can be put on depending on what FPV camera you have 👍 (The DJI 04 LITE would be GREAT for this!)
FlyerInStyle
Master member
awesome, good to know, thanks
Houndpup Rc
Legendary member
No prob
telnar1236
Elite member
Finally some video of the 64mm sport jet. It's quite challenging to film so it's a bit of a grey dot for decent parts of the video, but I also got footage of a knife edge pass and an inverted pass where you can at least see the plane, and good footage of the hand launch, so I'll have to be ok with it. You can tell how fast and capable it is just by how fast it's moving and the way it climbs. I edited out the part where I walk back to the stations after the hand launch since I'm just circling at altitude and you can't see the plane at all.
My solution to the hand launching challenge was to glue bits of sandpaper to the plane where you hold it which makes it much easier to keep a good grip on (this is only necessary with ABS - with LW-PLA the rougher surface was fine to hold without any additions). That said, I still plan to build a launch dolly - the plane hand launches decently now, but I'm not too good at hand launches and regardless of the plane, I have a tendency to accidentally throw them straight into the ground on occasion unless the stall speed and therefore force required are quite low.
telnar1236
Elite member
It should be interesting to see how quick it goes - the wing looks great, but the fuselage shape is a bit unusual - shouldn't prevent it from flying or flying well, but it may have a bit of drag to it - that said, I don't really have much experience with that shape so it might also be fine too.
Houndpup Rc
Legendary member
Yeah..IDK..The FT arrow kinda has that too but I got 92mph on a 4s setup, and this is more more aerodynamic as well as a bit smaller, so it will be interesting to see what happens...
Houndpup Rc
Legendary member
Yeah! The way it just took off right after launch is pretty impressive!
telnar1236
Elite member
Yeah, certainly doesn't look like it should be slow - and for flying wing designs the majority of the drag is in the wing itself which should be substantially improved by 3D printing. My only question is about the profile of the fuselage being the shape on the left instead of on the right. I don't actually know if it will be any higher in drag, but I'm a bit suspicious you'll get turbulence and flow separation in the places in red.
Looking forward to hearing about the maiden flight - it looks like it should a good plane
telnar1236
Elite member
I think 3D printing is both uniquely well suited to hand launching and uniquely bad for it. It's heavy which means you need quite the throw for some of these bigger planes, but on the other hand you can have good geometry which means it doesn't get squirrelly at higher angles of attack. With about 3-4 degrees washout in the wingtips (or up to 6-8 with flying wings and deltas) the wing won't tip stall as soon or as badly as wings with pretty much any other construction method which lets you push higher angles of attack a lot more easily. The sport jet is only good up to maybe 10-15 degrees AOA, but it's fun flying my 50mm jet trainer around at 30+ degrees since it doesn't look like it should be able to do that with its long straight wingYeah! The way it just took off right after launch is pretty impressive!
Houndpup Rc
Legendary member
Yeah, you could be right..When i first started designing it was originally going to be a long range cruiser. but it's kinda evolved into a pocket rocket!😂
Houndpup Rc
Legendary member
Thanks!
telnar1236
Elite member
I've been a bit busy, so I haven't had too much time to progress any of my projects, but I have finally gotten the BLI flying wing mostly printed.
It will weigh about 600g ready to fly with about that much thrust available on 3s. Wingspan is 36" so it's fairly lightly loaded and should hopefully be pretty floaty.
With the results from my testing of EDF thrust with different inlet designs and nozzle geometries from my super-duper sabre project, I'm getting slightly more static thrust out of this design on 3s than I was out of the 50mm test sabre on 4s despite the BLI flying wing having less inlet area. This should give it ok speed, although its larger wingspan and wing area and lower available power will likely limit its top speed somewhat. I also suspect the structure isn't really up to hard turns at 100 mph on this one, and this version of the BLI wing was never really meant to be fast.
I also have wings for the 70mm jet (thinking of calling it the Ghost since it will be printed in a light blue-gray ABS that will be somewhat hard to see against the sky which is why I'm using it on what will easily be the biggest plane of this lot).
I'm also trying to use this plane to test some of the features from my super-duper sabre. For example, it's designed to use the same main gear struts.
The plan is to print blocks with the same dimensions as the retract units for my build, but I'm designing in everything that would be needed to have retracts if someone wanted to install them so I can test the fit of the gear retracted as well as extended.
It will weigh about 600g ready to fly with about that much thrust available on 3s. Wingspan is 36" so it's fairly lightly loaded and should hopefully be pretty floaty.
With the results from my testing of EDF thrust with different inlet designs and nozzle geometries from my super-duper sabre project, I'm getting slightly more static thrust out of this design on 3s than I was out of the 50mm test sabre on 4s despite the BLI flying wing having less inlet area. This should give it ok speed, although its larger wingspan and wing area and lower available power will likely limit its top speed somewhat. I also suspect the structure isn't really up to hard turns at 100 mph on this one, and this version of the BLI wing was never really meant to be fast.
I also have wings for the 70mm jet (thinking of calling it the Ghost since it will be printed in a light blue-gray ABS that will be somewhat hard to see against the sky which is why I'm using it on what will easily be the biggest plane of this lot).
I'm also trying to use this plane to test some of the features from my super-duper sabre. For example, it's designed to use the same main gear struts.
The plan is to print blocks with the same dimensions as the retract units for my build, but I'm designing in everything that would be needed to have retracts if someone wanted to install them so I can test the fit of the gear retracted as well as extended.
telnar1236
Elite member
Elevons are now installed. These were surprisingly annoying to do. My original plan was to print them in the same LW-PLA as the rest of the airframe but they're so thin that the LW-PLA version turned out far too flexible and I could deflect the section near the control horn with the outer section not moving at all with very little force. So, I switched to normal PLA which made them much stronger, but then, because they're so thin, bed adhesion became annoying. They print easily in their current state, but it took two failed tries to get here.
I'm surprised by how much I'm liking how this plane looks now that it's printed. Looking at it in CAD, I wasn't fully convinced, but there's something pleasingly sci-fi about it, especially compared to the majority of my designs which lean towards 50s and 60s jet fighters.
I'm surprised by how much I'm liking how this plane looks now that it's printed. Looking at it in CAD, I wasn't fully convinced, but there's something pleasingly sci-fi about it, especially compared to the majority of my designs which lean towards 50s and 60s jet fighters.
Houndpup Rc
Legendary member
Agreed!👍
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