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Old May 13, 2006, 04:21 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
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First composite/ scratch build

This has been my first scratch build, and first time vacuum bagging something.

The wing has 1 layer of 2 ounce fiberglass on a bias, 2 layers of 5 ounce bi-directional carbon on a bias on the hole wing, and a layer of 5 ounce bi-directional carbon 0/100 on the first half on both sides as a d-tube. The tail has 1 layer of 2 ounce fiberglass on a bias, 1 layers of 5 ounce bi-directional carbon on a bias. I am still working on making the plug for the fuz as you can see in the picture but am almost ready to make the mold out of Ultracal 30.

The wing span is 60 inches and it has a ds-19 airfoil for the wing, and a SD8020 for the tail.

You think it will fly?


Little Cody
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Old May 13, 2006, 04:31 PM
gas tires and oil
prplgoat's Avatar
malad, idaho
Joined Dec 2004
2,444 Posts
gonna fly??
that is gonna rock!!
looks like a ds machine for sure!
cool. nice, very nice.

marty
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Old May 13, 2006, 04:46 PM
It's not a Toomah.
cwayland's Avatar
Orange County California
Joined Apr 2005
388 Posts
How are you gonna do the Fuse?

I tried doing a lost foam fuse a while ago and it really turned out crappy. I didnt figure out (or give any for-thought to) how to lay the glass onto the foam in a smooth way. I tried wrapping and stretching the glass over it but it didnt work. What are you gonna do with the fuse?

Clint
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Old May 13, 2006, 04:47 PM
Happy Trees
m4rs's Avatar
Colorady
Joined Mar 2005
1,332 Posts
Looks really cool cody!
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Old May 13, 2006, 04:53 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
I am making a mold for the fuse. I am using the steps from composite molding made easy http://home.paonline.com/hayman/PAGE3.htm


I am making the plug for the fuse out of foam, then making a mold out of Ultracal 30, then putting carbon into the mold to make the fuse.

Little Cody
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Old May 13, 2006, 05:05 PM
It's not a Toomah.
cwayland's Avatar
Orange County California
Joined Apr 2005
388 Posts
Yeessssssss! I see it all now. Exccccellent.

How about the leading edges of the wings/tail? Did you wrap the carbon around the LE before bagging? How about the trailing edges?

Sorry for all the questions, I'm just really a composite retard. I can fix my own comp. ships without a problem, but I dont know how those darn chech's make em in the first place.


Clint
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Old May 13, 2006, 05:10 PM
It's not a Toomah.
cwayland's Avatar
Orange County California
Joined Apr 2005
388 Posts
Sweet, I got another question.

How would one do a slip on nose cone?

What are you gonna do for access?

Clint
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Old May 13, 2006, 05:20 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
bagging the wing I wrapped a layer of carbon around the LE then extended the carbon skin passed the layer of carbon on the leading edge, after it dried I sanded it smooth.

For the TE I just extended the skin passed the foam core then cut and sanded it smooth and straight after it dried.

all this I learned from VACUUM BAGGING MADE EASY http://home.paonline.com/hayman/PAGE2.htm


For the nose cone I am going to cut the first 8 inches away from the plug and make the mold from that, then make a flat insert to go into it to put the radio gear on.

something like this
http://www.rcgroups.com/forums/attac...hmentid=774490

Little Cody
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Old May 13, 2006, 05:29 PM
It's not a Toomah.
cwayland's Avatar
Orange County California
Joined Apr 2005
388 Posts
Does that video talk about doing internal hinges on the wing/tail surfaces?

Cause that would be a sealed deal for me

clint
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Old May 13, 2006, 05:33 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
Yea it shows you how to make live hinges out of Kevlar. It is a very good movie, it goes through every step from making the cores till they are ready for sale.

Little Cody
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Old May 13, 2006, 05:35 PM
It's not a Toomah.
cwayland's Avatar
Orange County California
Joined Apr 2005
388 Posts
We havnt talked about what your going to do with it.

Fun, beater, DS....what?

and why so much dihedral when the trend now seems to be less?

clint
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Old May 13, 2006, 05:45 PM
Der Haifisch!! R.I.P.
BeeDee's Avatar
Fallbrook, California, United States
Joined Jul 2003
2,226 Posts
well it will be rock stable with that Dihedral... what kind of spar did you put in it??


BD
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Old May 13, 2006, 05:48 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
I wanted it to be for DS, that could deal with the very turbulent groove we have in Colorado, and a really fast plane just to mess around with. I thought the extra dihedral would make it more stable. I do not understand much about aerodynamics so the whole plane I just guessed on what it should be, and took what seemed to work on other planes.
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Old May 13, 2006, 05:53 PM
cody303's Avatar
Louisville, Colorado
Joined Nov 2003
780 Posts
For the spar I used 2 .125" X .325" Rectangular Carbon Rod. one goes out 24 inches on each wing and the other goes out 12 inches. I joined them with lots carbon tow. Its not as strong a some of the spars other people have made but the wing does not flex.
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Old May 13, 2006, 05:58 PM
Where's the wind?
the_canuck's Avatar
United States, CO, Denver
Joined Jun 2004
5,850 Posts
Looks good cody especially for a first timer.

Andrew
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