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Re: "Carbon" Dragon? 10 Dec 2013 23:58 #589

hi duey
the origional builder of my dragon told me of a conversation he had with the designer...he was told that the wood alone in the spar caps was strong enough.

that is hear say...i was not present.

if a spar cap was made from the wood alone.....ie.. no void for cf rovings...it would be stronger again......just to be clear here im talking about the wood only.

futher moor the solid wood spar would be lighter than a wood carbon spar.

also in regard to the tail boom,i belive with some consiltation with an aronautical engineer...you may find that a wood scin might be superior in terms of stifness,waight and compressive strenth...mainly becaus the cf skin is very thin.

if you were to build a wood dragon...then yours wood be my favorite:)

russ.


On Thu, Feb 2, 2012 at 12:02 PM, Dewey <This email address is being protected from spambots. You need JavaScript enabled to view it.> wrote:


The carbon boom I understand completely. Your Dragon is a much more "modern" interpretation of the design and looks great. I hope that mine turns out as good.



--- In This email address is being protected from spambots. You need JavaScript enabled to view it., "akahori" wrote:
>
> Dear Dewey
>
> If I thought, the designer would grope for the use of the then carbon in
> various ways.
> Because the carbon rod was not commercially available at the time of a
> design, is not there no help for it?
> The produced carbon dragon includes all, the present technique and is
> remodeled now.
> As for my dragon, the Web is glass fiber, and a spar cap is a carbon rod.
> However, it is a very interesting thing to create a pipe of the carbon by.
> I devise it in various ways, and please make a modern carbon dragon.
>
>
> Sorry broken english by yahoo translate. have fun.
>
>
> Yasushi Akahori from Japan
>
>
>
>
>
>
>
Original Message
> From: Dewey
> To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> Sent: Thursday, February 02, 2012 9:35 AM
> Subject: [Carbondragonbuildersandpilots] "Carbon" Dragon?
>
>
>
> First of all let me say that I am looking for edification and information,
> I am NOT looking to offend anyone. With that said, here goes.
> I own a set of Dragon plans and construction manual and there are a couple
> of things that I wonder about. The first is this, except for the tailboom is
> there really a point to the carbon roving that is incorporated into the
> airframe ostensibly for structural reinforcement?
> The roving can not possibly develop anywhere near its theoretical
> strength, mainly because it's impossible to keep all of the fibers straight
> and under consistent tension. would not omitting all of the roving and
> making the sparcaps of solid or laminated Spruce result in a structure that
> is just as strong at very close to the same weight? The carbon roving in the
> flaperon ribs and trailing ribs seems a bit gimmicky also. The flaperons
> already seem sufficiently robust in construction without the carbon. Lastly
> is the control parts that made of carbon like the torque tube, etc. Is this
> really needed? Why not aluminum? The ULF-1 uses no carbon, is it weaker than
> the Dragon? The Dragon's design seems quite normal for a wooden sailplane of
> its weight except for the roving.

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