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Fly2High
70 Posts |
 Posted - 11/29/2005 : 08:50:08 AM
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I am interested in rolling my own tailboom for a dlg. I would like to know how to do it and what materials to use. I have heard that unicarbon is used but the stuff I am looking at has a space every 1/4". I have heard of using 3oz unicarbon 0/90deg and bias .73 glass one layer each. any suggestions/opinions welcome. I am placing an order for material so if you have item #s from CST or aerospace composites or any other place that is cheaper let me know.
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stew swanson
16 Posts |
Posted - 11/29/2005 : 11:01:56 AM
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| Deny Maise at polecataero.com has DLG booms for $22 (16grams) |
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Fly2High
70 Posts |
Posted - 11/29/2005 : 2:25:28 PM
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| I am interested in doing it completely from scratch. I know about them and tailboom.com but am interested in the actual process and trying for myself. Thanks anyway for the info! |
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F3jeb
103 Posts |
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Fly2High
70 Posts |
Posted - 12/01/2005 : 11:26:13 AM
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Thanks Jose. I saw that link and another:
http://www.jantel.dsl.pipex.com/page20.html
(you need to manually change the page number to see how they build a DLG b/c the index doesn't work. I think they start the page around 16 or so).
The problem I have is that there is never any indication as to what materials (exactly) they use. For example, I was watching Phils DVD and he mentions uniweb carbon when laying up wings. This fabric has glass woven to hold the carbon tow every so often allowing someone to pull out a couple of bundles as needed. (By the way Phil I love the DVD - great information and very funny outtakes!). What Aerospace sells looks like it has plastic melted and randomly poured on top of it so you can't pull out any of the carbon to leave space for control surfaces. Also Aerospace's product has a 1/16" gap every 1/4" or so which isn't desireable to making a rolled boom when the fibers run the length of the boom. It is good for reinforcement when you need particular widths of 1/4" increments or so or when the space won't come into play. I guess I am looking for locations, product numbers and specific suggestions for boom making and materials. I really do appreciate all the feedback and help. I want to be able to make a DLG boom and a boom for a 3m class ship. Thanks
(By the way, if anyone knows where to get the uni carbon that Phil uses, I am interested to know. thanks). |
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Phil Barnes
100 Posts |
Posted - 12/02/2005 : 7:56:05 PM
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Try the following groups for information on rolling your own tailbooms:
http://www.rcgroups.com/forums/forumdisplay.php?f=96
http://groups.yahoo.com/group/SALglider/messages
You can try searching the messages in those groups first. The topic has come up numerous times before. I don't have links for materials since I don't bother to roll my own tail booms.
The carbon used in my DVD is called "uni-carbon/s-glass". I use mostly the 3.5oz variety which has 12 strands or tows of 3K carbon per inch in the long direction and 12 1K tows of s-glass in the fill direction. For higher stress areas I will use the 4.7oz variety which is exactly the same except that there are 16 tows per inch in both directions. Carbon and Kevlar are both very hard to find and expensive when you find it right now. The 3.5oz. uni-carbon/s-glass fabric comes from CARBCOM. They are the only source for that weight of that fabric. Here is the link:
http://carb.com/
Click on "carbon/s-glass". The web site still lists some 3.5oz and some 4.1oz which is effectively the same stuff. I am not sure that they actually have any of that in stock. The last I heard they were fairly close to getting more of it woven though. I would encourage you to call and ask about availabity of that fabric. I would appreciate hearing what they tell you. Feel free to email me:
philipdbarnes@verizon.net
What I have done in the past is buy up a few rolls of that fabric when it was available at low prices and then resell it in smaller quantities to guys who wanted it.
The heavier 4.7oz carbon/s-glass fabric has been available from a number of different sources. Right now it is still listed by Aircraft Spruce and Specialty (A.S.S.):
http://www.aircraftspruce.com/catalog/cmpages/unicarbongraphite.php
It is also listed at a fairly attractive price considering the current status of carbon availability. Once again, I'm not sure that it is actually in stock though. The only other place that might still have that fabric is ACP:
http://www.acp-composites.com/acp-sbwf.htm
They call it "4.7oz. 8020 graphite/s-glass" and it is listed on the web site but hold onto your seat if you decide to look up the price. Unlike A.S.S. , ACP is primarilly a composites supplier so they are more aware of the current lack of availability of all carbon fabrics and price their remaining stocks accordingly.
This 4.7oz weight of carbon/s-glass is woven by Hexcell and is called style 716. That will be useful information for anyone who wants to do a web search for it.
I am going to repost most of this to another RCgroups forum which is currently discussing some of my DVD methods:
http://www.rcgroups.com/forums/forumdisplay.php?f=210
You might want to check in there.
Phil Barnes |
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Fly2High
70 Posts |
Posted - 12/04/2005 : 10:11:51 PM
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Phil,
AS always great information. Thank you very much. I hope to put it to good use real soon! I must say that your video and Terry's has been very inspiring to me and very helpful so far in my endeavor to build a Super Gee II. I have hoped to build a foam core composite plane for many years and after seeing those two vidoes I have gained enough courage to try. So far my fiberglass mold for the fuse pod came out very good and I am having some success with cutting cores.
Thaks again!!
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jon stone
12 Posts |
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Fly2High
70 Posts |
Posted - 12/06/2005 : 1:09:08 PM
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| thanks. That page looks great! Seems like good information. |
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Rolling a tailboom and materials needed
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