telnar1236
Elite member
Looking good!
Looking for Ideas for 3D Printed Jets
- Thread starter telnar1236
- Start date
Houndpup Rc
Legendary member
Thanks! 👍 (Thanks to @Mr Man too!)
telnar1236
Elite member
CAD on my boundary layer ingesting flying wing is mostly done now. I still need to wrap up the design of the hatch, the servo mounts, and some of the routing for the motor wires, so I hope to have it built in the next week or so.
After this one, I think I'll be jumping into the 70mm design. I was originally thinking a straight up adaptation of my modular 70mm trainer, but now I'm thinking a slightly better design more along the lines of a scaled-up version of my failed 50mm trainer. I have a pretty good idea of what went wrong now (issues with the duct geometry caused a strong nose up moment when the EDF was on) and I've successfully flown a nose inlet on my 50mm super duper sabre prototype, so I feel more confident using this design again.
The idea with this one is to see how trainer-like I can make a high performance design, so it uses the same laminar flow air foil as my sport jet, but with a 51" (1300mm) wing. The goal is to hit at least 100 mph but with a landing speed around 25 mph (vs. around 30-35 mph for the majority of my EDF designs).
And finally, I still need to get video of my sport jet. It's quite challenging to launch while videoing with the runcam on my sunglasses since I keep managing to know my sunglasses askew. The ABS is also definitely more slippery than the LW-PLA so it's much harder to throw with the ABS surface. So I may end up needing to do a dolly takeoff for this one to help get the ABS version more reliably easy to launch.
After this one, I think I'll be jumping into the 70mm design. I was originally thinking a straight up adaptation of my modular 70mm trainer, but now I'm thinking a slightly better design more along the lines of a scaled-up version of my failed 50mm trainer. I have a pretty good idea of what went wrong now (issues with the duct geometry caused a strong nose up moment when the EDF was on) and I've successfully flown a nose inlet on my 50mm super duper sabre prototype, so I feel more confident using this design again.
The idea with this one is to see how trainer-like I can make a high performance design, so it uses the same laminar flow air foil as my sport jet, but with a 51" (1300mm) wing. The goal is to hit at least 100 mph but with a landing speed around 25 mph (vs. around 30-35 mph for the majority of my EDF designs).
And finally, I still need to get video of my sport jet. It's quite challenging to launch while videoing with the runcam on my sunglasses since I keep managing to know my sunglasses askew. The ABS is also definitely more slippery than the LW-PLA so it's much harder to throw with the ABS surface. So I may end up needing to do a dolly takeoff for this one to help get the ABS version more reliably easy to launch.
Houndpup Rc
Legendary member
Cool! 👍
Houndpup Rc
Legendary member
Oooops, I think this was going a bit off topic again....
Houndpup Rc
Legendary member
Been working on a flying wing!
telnar1236
Elite member
Looks good. Is this also intended to be printed?
Houndpup Rc
Legendary member
Yup! (I am trying to make it like Elipson's where it fits together nicely 👍 ) Now that I actually know what a 3D printer can and can't do as well as the strengths its a LOT easier!
I was jumping around between different CAD softwares trying to find one that was easier but I think it comes down to just taking your time and being prepared that it is going to take a awhile!😂😂
telnar1236
Elite member
With CAD the only way to get fast at it is a ton of practice. You learn the shortcuts and figure out better and worse ways to create the same feature, but even then it still takes a while to model a whole plane - I think I can knock out a relatively simple one in maybe 5-6 hours now, but the more complicated designs are probably more in the 50-100 hour range which is why it takes months to put them together.
Overall design looks good - the servo pockets look like they could be a significant pain to print though.
telnar1236
Elite member
With the fuselage in place, the boundary layer ingesting wing looks a lot more like a plane now. Wingspan is a bit greater than my 50mm jet trainer, but the weight is much lower due to the LW-PLA and less strong structure intended for 3S.
Houndpup Rc
Legendary member
Nice! 😁 👍
Houndpup Rc
Legendary member
Yup, that's what I am finding....I am getting better in Onshape, and I found it just had a more modern feeling and fast work flow than Fusion.
Yeah, I will have to use a couple supports....How would you recommend doing it?
telnar1236
Elite member
For me Fusion still feels like the modern new thing, but then I learned on Solidworks and NX when I got started.
Easiest option is to just add a couple 45 degree sloped sections like this. You'll also want to add some space for the servo wires since they stick out some from the side of the servo if you haven't already - a lot of my older designs left that out and you even see it missing from some designs sold online and it makes it a pain to install them.
A more aerodynamic option that also makes the servos removable is to design a separate servo tray. You make a pentagonal cutout in the wing with 45 degree angles for the roof and then a mount that can fit into it. This is what I used in my F-106, 50mm jet trainer, Saab 105, and more recently the sport jet in this thread.
Eclipson also uses a similar design, but with a more flexible plate that requires screws in all of the corners but is lighter and probably tougher (I've never had one of these servo mounts fail on any plane, either Eclipson or my own designs except in a crash the destroyed the surrounding wing too).
Houndpup Rc
Legendary member
Yup, I made it slightly wider for ease of fit and so the servo wires would fit 👍
Houndpup Rc
Legendary member
Oooff....Look like more designing my way!
Houndpup Rc
Legendary member
All done and I have the beta version printing out! I decided to just leave the servos sections for now, until I find out if it even flies!
You're getting some clean prints, good job!
Houndpup Rc
Legendary member
Thanks! I just use the presets!😂
(Aside from a couple adjustments, but I find its best at what its set at) Actually that is my BAD printing filament.....
Houndpup Rc
Legendary member
Here it is set out on the bench but nothing glued yet:
Houndpup Rc
Legendary member
Got it built up today!
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