What weight of CF for pull-pull servo tray?  
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All Forums >> RC Airplanes >> Composites Fabrication And Repair >> What weight of CF for pull-pull servo tray?
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What weight of CF for pull-pull servo tray? - 11/15/2002 4:06:02 PM   
Whymee


 

Posts: 171
Joined: 1/8/2002
From: Grafton, WV, USA
Status: offline 		Hi,

I want to build a rudder servo pull pull tray & I have no idea what weight of CF I need. I will be using giant servos in a 40% Edge. Please advise.

THANKS!
       Post #: 1

What weight of CF for pull-pull servo tray? - 11/15/2002 5:35:31 PM   
Jetman007



Posts: 294
Joined: 1/7/2002
From: Spring Lake, MI, USA
Status: offline 		If you are using CF laminated plates, 2mm thickness is fine for most applications like this. If the span of the plate is unusually long, you can use 2.5mm.





< Message edited by CAPtain232 -- Nov 16 2002 3:16AM >

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Art Gajewski

(in reply to Whymee)
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???????????? - 11/16/2002 3:47:07 AM   
dennis1943



Posts: 518
Joined: 12/25/2001
From: cross, SC, USA
Status: offline 		he was ok right up to the last sentence, he is making it commercial, any suggestions marc.


dennis

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dennis1943

(in reply to Whymee)
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What weight of CF for pull-pull servo tray? - 11/16/2002 4:28:54 AM   
Darrinc



Posts: 1028
Joined: 1/22/2002
From: Piqua, OH, USA
Status: offline 		Go with 5.7 oz, it is the most common and is the cheapest.

Use 1/8" Nomex Honeycomb or some Closed Cell Foam for your core. If you use Nomex or End Grain Balsa, throw it in your oven at about 200°F for about two hours before you lay-up. This gets out any moisture which will cause voids in your laminate.

Your lay-up should be, 0°, 45°, core, 45°, 0°. Put under vaccum if possible, or use a lot of weights.

You can cut a lot of lightening holes in the piece.
It will be plenty strong for your application.


Darrin C

(in reply to Whymee)
       Post #: 4

What weight of CF for pull-pull servo tray? - 11/16/2002 7:00:27 AM   
Whymee


 

Posts: 171
Joined: 1/8/2002
From: Grafton, WV, USA
Status: offline 		Thanks for the replies.

I had planned on laying up 1 layer of CF over a balsa core to give me my shape. After reading this I have decided to lay up 2 layers with a core of foam. I wish I had a vac. bagger. Can someome send me one for xmas?

Blue skies.........

(in reply to Whymee)
       Post #: 5

What weight of CF for pull-pull servo tray? - 11/16/2002 8:37:28 AM   
filtr-RCU



Posts: 163
Joined: 2/26/2002
From: Moose JawSaskatchewan, CANADA
Status: offline 		Darrinc

I was wondering if the tray was made just of CF or is there balsa in the middle. Also were can you buy nomex material. Is that what they are using for pattern ship fire walls.

Ron

(in reply to Whymee)
       Post #: 6

What weight of CF for pull-pull servo tray? - 11/17/2002 2:56:43 AM   
Darrinc



Posts: 1028
Joined: 1/22/2002
From: Piqua, OH, USA
Status: offline 		There is a core between the carbon skins, you adjust the strength by the thickness of the core. A solid carbon 1/8" laminate would be incredibly heavy.

If you are going to use balsa as a core, Gene of Troy Built Models told me to use the purple can of Aqua Net hair spray on the balsa before you lay it up. You spray until it puddles, then wipe smooth and wait for it to flash off. This prevents the balsa from absorbing the resin out of the skin.

Keep at it!

Darrin C

(in reply to Whymee)
       Post #: 7

What weight of CF for pull-pull servo tray? - 11/17/2002 10:13:15 PM   
filtr-RCU



Posts: 163
Joined: 2/26/2002
From: Moose JawSaskatchewan, CANADA
Status: offline 		Darrinc

I was wondering if you know a good supply of the nomex core. Also what is closed cell foam.

Ron

(in reply to Whymee)
       Post #: 8

What weight of CF for pull-pull servo tray? - 11/17/2002 11:57:26 PM   
Darrinc



Posts: 1028
Joined: 1/22/2002
From: Piqua, OH, USA
Status: offline 		PLASCORE and Hexcel are the big manufactures, give them a call and see what they can do for you.

This is Hexcel's part number: 1.8 1/8 HRH-10
See if they will send you their tech manuals
on the honeycomb material, there great!

Here is a place to get 2'x4' sections.

http://www.avtcomposites.com/core.php3

CST is a good place to find material also, they have a core material section with definitions.

http://www.cstsales.com/catalog.htm

Darrin C

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"Make everything like your going to make the front page of NASA Tech Briefs"
Go Team Orange! Darrin R Cash

(in reply to Whymee)
       Post #: 9

What weight of CF for pull-pull servo tray? - 11/18/2002 9:14:04 AM   
filtr-RCU



Posts: 163
Joined: 2/26/2002
From: Moose JawSaskatchewan, CANADA
Status: offline 		Darrin

Thanks for info.

Ron

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       Post #: 10

What weight of CF for pull-pull servo tray? - 11/25/2002 7:58:30 PM   
rcplanefan


 

Posts: 312
Joined: 8/1/2002
From: Cincinnati, OH, USA
Status: offline 		Question for you guys making these plates for servo trays: What do you use to give the servo screws something to "bite" into? Maybe a thin (1/8" plywood piece below the tray?

Ken

(in reply to Whymee)
       Post #: 11

What weight of CF for pull-pull servo tray? - 11/26/2002 5:37:27 AM   
Whymee


 

Posts: 171
Joined: 1/8/2002
From: Grafton, WV, USA
Status: offline 		Good question Ken. I never really thought about it until you posed the question.

I think I will make the "meat" of the sandwich out of balsa. After making holes for the servos, I shall cut out & replace with ply where the screws will go thru. Should be Strong enuf.

Blue Skies.....

(in reply to Whymee)
       Post #: 12

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