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Old May 13, 2006, 05:21 PM
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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, 05:31 PM
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gas tires and oil
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gonna fly??
that is gonna rock!!
looks like a ds machine for sure!
cool. nice, very nice.

marty
Old May 13, 2006, 05:46 PM
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It's not a Toomah.
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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
Old May 13, 2006, 05:47 PM
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Happy Trees
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Looks really cool cody!
Old May 13, 2006, 05:53 PM
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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, 06:05 PM
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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
Old May 13, 2006, 06:10 PM
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Sweet, I got another question.

How would one do a slip on nose cone?

What are you gonna do for access?

Clint
Old May 13, 2006, 06:20 PM
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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
https://www.rcgroups.com/forums/atta...hmentid=774490

Little Cody
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Old May 13, 2006, 06:29 PM
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Does that video talk about doing internal hinges on the wing/tail surfaces?

Cause that would be a sealed deal for me

clint
Old May 13, 2006, 06:33 PM
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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, 06:35 PM
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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
Old May 13, 2006, 06:45 PM
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well it will be rock stable with that Dihedral... what kind of spar did you put in it??


BD
Old May 13, 2006, 06:48 PM
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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, 06:53 PM
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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, 06:58 PM
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Where's the wind?
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Looks good cody especially for a first timer.

Andrew


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