WimacWest

[Andre Germain]

Had a rather calm day to test the RPV5.2 further - the roll/yaw coupling is obvious. Removal of dihedral will reduce it as will increasing vertical stab moment. I also added thin aluminum extensions on the elevon to give more control - much nicer!

I enjoyed flying it around the property, even though it's meant to hone a better design. I've been flying EDFs for so long, I miss props, so much less stressful, getting more than 5 mins per battery at that. Have a look.

https://youtube.com/shorts/nYuhk0AkKUA

https://youtu.be/yG0xqBBVFB4

https://youtube.com/shorts/xuwu8Wc43sI

The 'dutch roll' will be corrected when I remove the dihedral and increase yaw moment.

[Andre Germain]

When I bought the incredible Bambu X1 Carbon 3D printer, the Creality CR-20S pro I had on hand was no longer required. I took it apart and used some of its parts to re-do my DIY foam cutter as it was originally using kitchen drawer bearing slides which wobbled about 1 mm, leading to a less ideal surface on parts. With the extruded rails, and lots of new green and black Bambu printed part, the wobble is no more. Another bonus is the minimum wire height is lower, with more travel on the horizontal axis than the original wood carriage. I also am trying out a weight constant tension wire system (see black part with cone, tubing and pulley) as compared to the original spring tension which varied too much.

[pierre sarault]

Andre, Bravo for the experiments in Design and build on your posts. A WIMAC member for years I've designed a few of my planes and thought 3D CAD was my answer to several hand-building and time-consuming limitations as well as the limited ability to easily replicate the designs.
Thanks, you have shown with your work and the posted videos what can and can't be done to a great extent.

I just got a Flashforge 3D printer from a friend (who designs components and products with Solidworks for a Company) and I was planning to subscribe to SolidWorks or Fusion 360 and start designing using 3D. In an earlier post you described that thus stuff should have happened lots of years ago...totally agree as in the 70's and 80's I was designing and building my own 18 ft racing sailboats (as models for larger projects)...life is too slow and too fast at the same time!
Andrew Fernie's posts/ replies to yours are also appreciated interesting.

Thank-You much! Pierre Sarault MAAC 60547

[Andre Germain]

Merci Pierre

Although it's going to be quiet for winter - my shop is a garage separate from the house, not heated unless I fire up an oil furnace. I promise lots more in spring.

Regards
P.S: Gosh, I don't remember my MAAC #, joined MAAC & WIMAC circa 1984, and haven't been a club member since 2015 when I moved out to Eastern Ontario on farm acreage.

[Andre Germain]

blush... my MAAC # is displayed with everyone of my posts.

[Andre Germain]

Tested out my new Bambu X1C with AMS on printing PLA-LW and TPU. The PLA-LW came out much more clean and solid, however that won't address the 2 to 3x heavier parts than when done with foam - still, interesting how a premium FDM can perform. Also tried out TPU rubber for an R/C wheel with the hub in PLA - not bad!

[Andre Germain]

Sliced the wing to remove the dihedral and flew it today - lovely! no more Dutch roll, only a hint of it near stall. No video - wife didn't want to brave the cold and mist

On the CNC foam cutter, moved from spring to hanging weight (over the side of one tower by slotted pulley), constant wire tension, perfect - bye bye springs. Also tried a 0.8mm iso 0.4mm nichrome wire, worked but a tad too stiff and harder to get kinks out of it.

Amazon'ed a scissor lift for foam stock height control - see attached.