Spitfire76's Build Log of the Eclipson PRADNDTL V2

[Spitfire76]

I purchased the files for the
https://www.eclipson-airplanes.com/prandtl
in December of 2021 but only got as far as printing the parts. Its one of those projects that got preempted by other projects but I have been recently inspired to complete it by this challenge.
https://forum.flitetest.com/index.php?threads/2023-spring-sprint-wrap-up-challenge.72822/
which I learnt about on
https://aviationrcnoob.com/ep-70-special-guest-tony-lewis-finish-what-you-started/

I had never heard of the Prandtl until I listened to this early episode of the AvaitionRCnoob's podcast episode 25.
https://aviationrcnoob.com/ep-25-nasa-with-special-guest-red-jensen-part-1/

 

[LitterBug]

I have a V1 and V2 printed but not built..... May be finishing them later this year

 

[Spitfire76]

Printed these awhile back and looks like at least one part of the right wing is missing. Looks like I maybe have duplicated another part of the right wing instead. I have leant since that it always good to label the parts as they are printed.

 

[Spitfire76]

Since the printed parts are not assembled I will document the weights. I am not saying that these are the correct weights its just the weights that I have.

I did notice that the profile parameters are not always the same between Eclipson models. For example on this model the A_LW speed is 40mm/s but more recent models that I've built like the model B have a higher speed of 55mm/s and since speed, flow rate and temperature determines the foaming density it could make a difference in strength and or weight.

	Weight (g)	Profile	Notes
WingC	51	A	Printed with regular PLA as per drawing but build video looks like LW-PLA ?
Wing1L and Wing1R	23	A-LW
Wing2L and Wing2R	16	A-LW
Wing3L and Wing3R	10	A-LW
Wing4L and Wing4R	5	A-LW
Elevon_1L and Elevon_1R	1	B-LW	6 bottom layers
Elevon_2L and Elevon_2R	2	A-LW
Elevon_3L and Elevon_3R	<1	A-LW
Keel_L and Keel_R

to be continued......

 

[Spitfire76]

Tried to print the missing Wing1R but got a "Temp fall" error about 75% of the way through. I've had a few of these recently on my old Robo 3D R1 +. I had replaced the stock hot end with a E3D V6 Lite awhile ago and it has been working fine for quite sometime. I believe that the error means that the detected temperature of the hot end has fallen below a certain limit. Not going to trouble shoot as I recently purchased a Bambu Lab's P1P but have yet to print with LW-PLA using the recommended settings of the Eclipson A-LW profile but I guess its time to try. The reason for still printing LW-PLA on the R1+ is that I had the A-LW profile all setup in Cura but the P1P's slicer is Bambu Studio that is based on the Prusa slicer.

 

[Spitfire76]

Not having much luck with printing the ColorFabb's LW-PLA on the Bambu Lab's P1P so tried again on the old Robo 3D R1 + and it printed without errors this time. So now have all the parts printed so can get on with assembly.

 

[Spitfire76]

I had previously printed WingC with regular PLA as per the drawing category but noticed that in their build video it looks like they printed it in LW. Also there is a large gap where it joins Wing1R which must have been due to a bit of warping on that side of WingC. I may try printing it again but do I use LW-PLA or regular ?

 

[Spitfire76]

Using a X2212-13 980 II kV motor. M3 x 6mm bolts seem fine for mounting.

 

[Spitfire76]

I had previously printed WingC with regular PLA as per the drawing category but noticed that in their build video it looks like they printed it in LW. Also there is a large gap where it joins Wing1R which must have been due to a bit of warping on that side of WingC. I may try printing it again but do I use LW-PLA or regular ?

View attachment 236192

Trying to printer another WingC but on my P1P but running into problems. Using Bambu Lab's White Matte PLA (not LW) and getting gaps in areas where the outer wall connects with inner supports despite having the "Slice gap closing radius" set to 0 instead of 0.049 as per

FAQ

www.eclipson-airplanes.com

but looks like I may also need to add "M900 K0" at the end of the custom code.

 

[Spitfire76]

Adding "M900 K0" to the end of the custom start gcode as well as setting the "Slice gap closing radius" to 0 did resolve the problem of the outer wall and internal support not connecting. Eclipson's FAQ pointed this out as a change required when using the Prusa Slicer but since the Bambu Slicer is based on the Prusa its needed also.

So moving along and now have the elevons installed although I find it a bit messy with having to use tape for the hinges. I like the 3d printed hinges used on some of their later models. Also their most recent models use small TPU printed hinges which would be nice to have on a V3 version of this model.

 

[Spitfire76]

Some progress but challenge now is to squeeze in an ESC, Rx and battery (and possibly an Aura 5 lite) into such a small space!.

 

[Spitfire76]

With the April 30th deadline rapidly approaching I made a last minute sprint with this project and the plane is ready to maiden.

 

[Spitfire76]

Its been so long since I completed this build and its about time I flew it!

Also now that I have Realflight Evolution I have added this plane to practice with.

Eclipson Prandtl_EA

This is our version 3d printed version of the famous PRANDTL wing project developed by NASA, Armstrong Chief Scientist Al Bowers challenged the fundamental core assumptions of leaders in the field of aviation. He began his multiple-year trek to...

forums.realflight.com

 

[Spitfire76]

 

[Mr NCT]

View attachment 247031

That is so cool! It looks fast just hanging there, great job.

 

[LitterBug]

Ihave a V1 and a V2 that I need to finish. Time to build!

 

[Spitfire76]

Ihave a V1 and a V2 that I need to finish. Time to build!

Well I printed it in late 2021 but what prompted me recently to revisit it was the latest episode of the AviationRCnoob podcast (episode 100 not published yet) as their special guest was NASA Armstrong Chief Scientist, retired, Al Bowers and I was able to listen in to the live recording.

 

[Spitfire76]

Added Elevon mixing to my TX16s

 

[Mr Man]

That wing looks like it will have a wide flight envelope.

 

[LitterBug]

Well I printed it in late 2021 but what prompted me recently to revisit it was the latest episode of the AviationRCnoob podcast (episode 100 not published yet) as their special guest was NASA Armstrong Chief Scientist, retired, Al Bowers and I was able to listen in to the live recording.

I have viewed many videos with him talking PRANDTL