YC 14 Winter Project

[Burnhard]

Wing is closed. I started experimenting with the flaps today. Build a little mock-up of the wing to do that. The set-up generally works as you can see from the attached pictures.

View attachment IMG_3497.jpeg
View attachment IMG_3498.jpeg

What does not work so great is that the first flap creates quite a large step when lowering the flaps.

Does anybody of you has an idea how to solve this? The one thing that comes to mind is that I could cut the upper part of the flap a bit further back (maybe 2 cm or so). Any thoughts?

 

[bisco]

hard to tell exactly what is wrong from that angle

 

[Burnhard]

hard to tell exactly what is wrong from that angle

Here is a pic that shows it better. You can clearly see how the flap rises over the upper wing surface. View attachment IMG_3502.jpeg

 

[Burnhard]

I belive I found a solution for the flaps. Increased the angle on the hinge for the first flap to 70 degrees (from 60) and shortened the upper sing of the flap by about 2cm (and added these to the upper surface of the wing. Now it works much better. View attachment IMG_3506.jpeg
View attachment IMG_3507.jpeg
View attachment IMG_3509.jpeg

 

[Burnhard]

Made good progress today. Cut the inner flaps
From the wing. Then did a test piece of the outer wing to do a test of the outer flaps. That worked as well. Will try to complete the wing over the Easter weekend.
View attachment IMG_3510.jpeg

 

[bisco]

looking good! i think you really figured it out. i was baffled

 

[Burnhard]

Got all the surfaces cut and got first fan installed. Next stop is figuring out how to get the wing attached.

 

[Burnhard]

Installed the servos over the weekend. Also figured out on how to install the wing. I will first fully complete the wing and will then mount the wing in the fuse. I guess by end of next weekend we can probably do our first self powered roll test.

 

[Burnhard]

That thing is massive.
View attachment IMG_3559.jpeg

 

[telnar1236]

Looking good, I like the flap mechanism

 

[Burnhard]

Tada, she stands on her own feet and is on internal power. Did a first roll test (and she rolls).
View attachment IMG_3562.jpeg

 

[bisco]

well done!

 

[Burnhard]

She flies!

Had my maiden today. She takes quite long to get her of the ground (so no short take off) but she flies great. What a presence in the sky. Next stop paint job.

 

[Burnhard]

So today was actually the second maiden attempt. On the first try a few months ago she did not take-off. It looked like she wanted to go into the grass. Apparently the angle of attack for the wing was negative which pushed her to the ground rather than getting lift. Simple solution to this was to make the front landing gear a few centimeters higher. First thought about getting a new landing gear with bigger wheels or a longer leg but both would have meant to rework the whole set up. So instead removed the installed landing gear and added a few layers of balsa/ply underneath so that I got my extra centimeters.

For take-off today I gave light flaps. Wind was not ideal with only little wind but rather from the back. It took a bit of runway until she was fast enough for the elevator to become effective. She took off very gratuitously.

Needed no trimming. I kept the flaps out when she was up. So this will be something to experiment for the next time.

The EDFs suck up a lot of juice. Both 4s 3000 packs where at 51% when I brought her in after about a minute of flight time (I flew her rather fast).

Oh boy, I was really worried whether she will fly and this was just great.

 

[Burnhard]

The son managed a nice shot today

 

[Mr Man]

The son managed a nice shot today View attachment 253156 View attachment 253157

Ooh, I like the second one a lot!👍👍😎

 

[Mr NCT]

The son managed a nice shot today View attachment 253156 View attachment 253157

WOW! That looks great, quite a presence in the air.

 

[LitterBug]

Ooh, I like the second one a lot!👍👍😎

I was thinking the same thing!