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Old 09-12-2008, 03:38 AM   #1
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Default "YADA" - Yet Another Delta Airplane, for Scratch Build Contest #2

I'm really into Kline-Fogleman (KF) airfoils and so I thought I'd take the SuperFly shape and see what I could do with it.

This will be:

- super easy to build
- use low cost and readily available components
- fly like a dream :-)

Rick


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Old 09-12-2008, 04:03 AM   #2
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I'm using 1/2" styrofoam insulation which cost $6.19 per 2' x 8' sheet. The wingspan is 33" right now. I may make it bigger depending on how the first flight tests go.

With the extra layer of foam and a bit of balsa spacer for the KF step plus some fiberglass strapping tape it won't need any carbon fiber.

The leading edge will be 'squashed' down top and bottom with a hot iron and then covered with packing tape making it low profile and very tough.

I'm expecting the AUW to be around 14 oz with battery.
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Old 09-12-2008, 04:11 AM   #3
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Here's YADA versus the SuperFly. It doesn't look that much bigger in the picture but it really is.

Between the KF airfoil and the addition of a rudder I'm hoping for a very stable yet aerobatic slow flyer.


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Old 09-12-2008, 04:20 AM   #4
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Originally Posted by GreenAce92 View Post
Pretty cool man, yeah i like that stuff for flying wings, its a nice thickness where you can just sand the foam into an airfoil kinda annoying though when you sand it by hand(which i did) i like it cuz its ligth.

But yeah man should be pretty sweet at flying
have fun and good luck
Thanks for the encouragement GreenAce. I'm dreaming of one with about a 5' wingspan but we shall see!
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Old 09-12-2008, 04:40 AM   #5
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Mine came from Home Depot too. They have 1/2" in 2' x 8' and 4' x 8' sheets. I can't find the bluecore stuff anywhere although I have seen it used for flotation under docks.

I think that this pink foam is pretty brittle but I'm hoping that the packing tape in critical areas will fix that.
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Old 09-12-2008, 04:49 AM   #6
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Default More build pics...

I am keeping this very simple. I used a spruce stick to connect to a GWS stick mount and also to strengthen the nose where the SuperFly and HyperFlea are very prone to break.

A few pieces of strapping tape top and bottom are all that are needed to make the wing very stiff and hopefully survive at least the initial testing :-)


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Old 09-12-2008, 05:00 AM   #7
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I will have to be carefull with the details! Yes the prop is on backwards. I just had that motor and prop kicking around and stuck it on the stick for the picture.

I am thinking that this delta will be a pretty good motor test platform. With the stick mount and the ability to use a decent size motor you could experiment a lot. We shall see.
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Old 09-12-2008, 05:07 AM   #8
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I'm just killing myself laughing thinking that maybe I could have tried to fly it like that without noticing. Not like I haven't accidentally had the prop on backwards before. LOL.

I totally appreciate all comments!
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Old 09-12-2008, 05:14 AM   #9
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Default KF Podcast

I just listened to a really great podcast about the KF airfoil:

http://www.rcflightcast.com/index.php?post_id=376178

Dave Powers is using this design for his latest creations...
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Old 09-12-2008, 01:41 PM   #10
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It sure is a bright pink. I'm surprised Chellie hasn't commented yet...

For assembly I'm using the new Gorilla glue that drys white as I've had a lot of success with it lately. Since the KF airfoil is only joined at the edges the foaming of the glue should provide a better bond than anything else. That's the theory anyway and it worked well on my previous project.
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Old 09-13-2008, 01:54 AM   #11
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Originally Posted by CHELLIE View Post
I Just Found your thread Its Looking great In PINK
keep it PINK Chellie
I think I may need advice on the color scheme then... I usually use red or orange for contrast but that sure isn't going to work here.

How about just some black stripes on the bottom?
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Old 09-13-2008, 01:56 AM   #12
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Oh my, Chellie posted before me and so I retract the "black stripes on the bottom" part. LOL.
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Old 09-13-2008, 02:01 AM   #13
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Originally Posted by CHELLIE View Post
I Like IT its Pink

Whats The Matter, you Guys dont Like HOT PINK

Do I get points for the most views of any thread???
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Old 09-13-2008, 02:08 AM   #14
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Chellie you are just too funny!

My YADA will definitely stay pink even if it gets to be 6 ft wingspan. Just imagine!
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Old 10-06-2008, 03:44 AM   #15
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Default Back at it...

I had to set this project aside for various reasons but last Friday I got back at it again.

I glued the KF wing halves together and made the cutouts for the elevon servos. So far so good...

Here's the pictures on Picasa Web:

http://picasaweb.google.com/RocketMa...y=IZdoz7dQTTw#

Rick
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Old 10-06-2008, 03:56 AM   #16
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Today I did some test flights in spite of the wind and I was very pleased with the results. Here is the setup so far:

http://picasaweb.google.com/RocketMa...y=CGAgEZfPMV4#

It's still mostly pink!

I have video to follow tomorrow...

Rick
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Old 10-06-2008, 04:50 PM   #17
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Thumbs up YADA Flies!

YADA proof of flight video as promised:

http://vimeo.com/1896430

What a thrill it was to fly it the first time!

I tried it with a range of batteries from 3S-800 to 3S-2150 which moves the CG around a bit but it doesn't seem to matter very much as far as handling goes. With the lighter batteries it glides really well which is likely due to the KF airfoil.

I probably have about 10 flights so far and I'm very happy with it but it needs some improvements:

- the vertical stabilizer needs to be bigger and maybe it would be good to have wing tip fins as well

- the rudder is more effective than I thought it would be but I think it could be bigger

- it's very noisy so I'm going to try tapering the sides of the cutout for the prop to see if that helps

- I'm going to make a built up canopy to hide the electronics and also to provide a bit more side force

I think it would scale up in size quite nicely still using the 1/2" foam so I'm thinking of making a much bigger one...

Rick
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Old 10-07-2008, 01:15 PM   #18
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Default Second day of flying the YADA...

Thanks for the comments Jim!

Yesterday evening I tried adding wing tip fins and I didn't like the effect at all. It became very sluggish in the roll axis. So I took the wing tips off and extended the height of the vertical stabilizer about 2" and that seemed to work a lot better. I was looking for a bit more stability particularly in the wind.

I am going to replace the now hacked up vertical stabilizer and rudder with new one made out of 6mm depron to reduce the drag a bit.

Rick
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Old 11-12-2008, 12:50 PM   #19
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I let a friend of mine fly the YADA and he liked it so much that I gave it to him! I haven't built another one yet but I plan to make a bigger at some point.

Before I gave it away I measured all the dimensions and I can provide a sketch and some construction notes. It's really easy to build and flys incredibly well!

Rick
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