HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Nov 17, 2009, 03:45 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Discussion
CF for DLG Booms and Pods

Could I use this around a waxed mold to make DLG tail booms?

Carbon Fiber Braided Sleeves
Available in .25", .5", 1", 1.5", 2.5" and 4" diameters
ACP’s Braided Carbon Sleeve is a triaxle braid of precisely oriented fibers of maximum stiffness, torsial stability, and compressive strength. It can be used to manufacture tapered tail booms, tubes, and motorcycle exhaust pipes. The sleeves are capable of expanding and contracting approximately 3/8” in diameter allowing for a variety of tapers.

or this:

3.7 Oz. "Uni-Web" Unidirectional Carbon Fiber
Available in 1", 2" and 12" widths
UniWeb is a new and easy to apply type of reinforcement. It consists of a nonwoven sheet of unidirectional carbon fibers that are held in position by a fine spider web of polymer fibrils Iying on the surface. The special polymer used is compatible with epoxy and polyester resins. The fibril or web system that bonds the reinforcement fibers together allows the fabric to be cut easily, trimmed, or slit, giving clean edges with absolutely no fraying. The fibers lie flat and straight, and cannot shift or bunch up as often happens with uni-stitched fabrics.


And I guess while I'm at it what about a layup for the pod?
Something like this:


3.5 Oz/Sq Yd., 42" Wide, Plain Weave

This mid-weight carbon fabric is woven from 1K carbon strands in a 24x24 strand/inch count, yeilding a pliable, tight weave fabric.

Thanks so much.
Curtis
Montana
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Sign up now
to remove ads between posts
Old Nov 17, 2009, 05:08 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
I guess what I'm asking is what carbon and fiberglass weights could I use to make a DLG pod and a DLG boom like Polecat Aero used to sell?

I'm enjoying learning these processes but prefer NOT to use Kevlar due to the expense and the difficulty working with it.

Thanks
Curtis
Montana
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 17, 2009, 05:55 PM
Registered User
soarluck's Avatar
Canada .the great
Joined Jan 2008
1,521 Posts
Kevlar is nice to work with but thats just me.

The carbon for rolling booms is two kinds that I know of. 3.7 oz uni-directional as you described and then a eqaul amount of 8820 carbon uni-directional which has carbon running warp [0] and S glass for fill .Its perfect material for a XP style wings [stressed skin for spar] and also booms http://www.aircraftspruce.com/catalo...ongraphite.php
soarluck is offline Find More Posts by soarluck
Reply With Quote
Old Nov 17, 2009, 07:04 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Thanks Soarluck.

Well what about this Kevlar then:
http://www.acp-composites.com/home.php?cat=252
7th item down the list:

2.5 Oz. "Uni-Web" Unidirectional Kevlar®

Unidirectional Kevlar® is a new and easy to apply type of reinforcement. It consists of a non-woven sheet of unidirectional Kevlar® fibers that are held in position by a fine spider web of polymer fibrils lying on one or both surfaces. The special polymer used is compatible with epoxy and polyester resins. The fibril or web system that bonds the reinforcement fibers together allows the fabric to be cut easily, trimmed, or slit, giving clean edges with absolutely no fraying. The fibers lie flat and straight, and cannot shift or bunch up as often happens with uni-stitched fabrics.

Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 17, 2009, 07:09 PM
Registered User
David Forbes's Avatar
United States, FL, Gainesville
Joined Dec 2005
2,899 Posts
Curtis,
Here's THE boom thread: http://www.rcgroups.com/forums/showt...+rolling+booms
Should give you a good place to start.
Dave
David Forbes is online now Find More Posts by David Forbes
Reply With Quote
Old Nov 17, 2009, 07:19 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
6,915 Posts
The kevlar would blow for the boom because Kevlar has poor performance in respect to compression forces. You would do much better using carbon there because carbon handle the compression forces much better.
wyowindworks is offline Find More Posts by wyowindworks
Reply With Quote
Old Nov 17, 2009, 09:11 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Quote:
Originally Posted by wyowindworks View Post
The kevlar would blow for the boom because Kevlar has poor performance in respect to compression forces. You would do much better using carbon there because carbon handle the compression forces much better.
I'm sorry, I was replying to the pod portion.

Thanks
Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 17, 2009, 09:12 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Quote:
Originally Posted by David Forbes View Post
Curtis,
Here's THE boom thread: http://www.rcgroups.com/forums/showt...+rolling+booms
Should give you a good place to start.
Dave
Thanks David. I searched off and on for about two hours and couldn't find it! :-)

Thanks
Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 17, 2009, 11:17 PM
wishes this caption was longe
will_newton's Avatar
wilson, nc, usa
Joined Dec 2005
2,214 Posts
http://www.avtcomposites.com/reinforcements.php3

carbon fabric Type 282 for dlg pods

http://www.sollercomposites.com/comp...ni-fabric.html

for dlg booms use 4.1oz but it is not high modulus, even though it says so on the web page.

read that boom thread!
will_newton is offline Find More Posts by will_newton
Reply With Quote
Old Nov 18, 2009, 09:47 AM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Thanks folks! I really appreciate the help.

For the boom:
Is there a substitute for the 80/20 carbon/glass, that stuffs hard to find and expensive! :-)

Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 18, 2009, 11:41 AM
Registered User
soarluck's Avatar
Canada .the great
Joined Jan 2008
1,521 Posts
@Curtis 80/20 may not yield as good of a search as style 716 which is its real name.

As Phil explains 80 /20 is a name the fabric adopted in the trade because of the content.

Its know As style 716 in the sales end of things SL
soarluck is offline Find More Posts by soarluck
Reply With Quote
Old Nov 18, 2009, 11:56 AM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Okay, I'll search for 716.

What's the fiberglass do to the carbon? Does it hold the carbon fibers in place better than just using straight carbon?

Gotta head off to work, have a nice day folks.

Thanks
Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Reply With Quote
Old Nov 18, 2009, 12:06 PM
wishes this caption was longe
will_newton's Avatar
wilson, nc, usa
Joined Dec 2005
2,214 Posts
Quote:
Originally Posted by CloudyIFR View Post
What's the fiberglass do to the carbon? Does it hold the carbon fibers in place better than just using straight carbon?
you need this thread for that info
http://www.rcgroups.com/forums/showt...t=stiffer+boom
will_newton is offline Find More Posts by will_newton
Reply With Quote
Old Nov 21, 2009, 01:53 PM
Red Merle ALES
Curtis Suter's Avatar
United States, Mt, Helena
Joined Apr 2002
5,704 Posts
Oh boy, I'm about there with all the product orders.

Thanks so much.
Since this is my thread I'm going to move to a slightly different subject, because I can. :-)

I'm going to layup another boom on a pool cue for a Supra type model that I'll be making an electric assisted launch. More on that later.

I'm looking for 6 ounce, or thereabouts, fiberglass that's unidirectional.

I can't tell from what's written here but which one am I looking for:
https://www.acp-composites.com/home.php?cat=261

Also,
Does anyone know the weight of fiberglass for the braided sleeve? It's the second to last item on the website above:


Thanks so much.
Curtis
Curtis Suter is online now Find More Posts by Curtis Suter
RCG Plus Member
Last edited by Curtis Suter; Nov 21, 2009 at 07:30 PM. Reason: text
Reply With Quote
Old Nov 21, 2009, 09:56 PM
Registered User
United States, CO, Denver
Joined Sep 2005
260 Posts
Here's some uni fiberglass

Quote:
Originally Posted by
.....I'm looking for 6 ounce, or thereabouts, fiberglass that's [B
unidirectional[/B].......

Aircraft Spruce and Wicks Aircraft carry Unidirectional fiberglass in a 7oz variety.

http://www.aircraftspruce.com/catalog/cmpages/rutan.php

http://www.wicksaircraft.com/catalog...492/index.html

Mike
ThermalSeeker is offline Find More Posts by ThermalSeeker
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
For Sale DLG tail booms and wing cores soaringMoe Aircraft - Sailplanes (FS/W) 14 Nov 09, 2009 12:39 AM
Discussion Looking for a source of smaller diameter lightweight dlg booms Ryan Archer Hand Launch 1 Sep 26, 2009 10:01 PM
New Product Supra booms, BubbleDancer booms and DLG booms dennymaize Thermal 10 May 01, 2006 07:00 PM
New Product Raptr Pods and booms now availabe to the homebuilder atlav8r Product Announcements 0 Mar 25, 2006 06:06 PM