Making a Ribless D box

[Anonymous]

I am toying with making some ribless D boxes, and am looking for suggestions on how best to do this.

To go back one step, for a normal D box with riblets I would use one layer of cloth with the layup at 45′.
The cloth would be whatever was deemed appropriate for the use, ie for F1b I would use 90 gram carbon, for F1A/C I would use twice this weight.

So what is a good layup to make it ribless ?, would I add some UD carbon ?, going span wise, or perhaps chordwise.
What have people used that has worked ?

I have kevlar and carbon cloth in several weights, and UD carbon.
And several weights of glass cloth.

Thanks for your help.

David Ackery

[Anonymous]

Hi Dave, I’m interested in this method too. I’ve just finished making the D box ribs for a 2.6m F1c wing, a method of construction that does away with them seems most desirable just now….. I’ve also just bought home from Airsail some 008″ “Super Skin” to use on the back of the spars to complete the D box effect. It’s a flash fibreglass sheet intended for skining scale models of metal aircraft. I’ll bring some to the next club night….

Phil.

[Anonymous]

Hi Dave and Phil

Dave, contact me off line with you postal address and I will send you a CD copy of the Mike Woodhouse article on ribless construction. It’s in PDF format an at 6 meg and will take for ever to transmit on dial up. Share the info with Phil.

Cheers
Ployd

[Anonymous]

@Pelaero wrote:

Hi Dave and Phil

Dave, contact me off line with you postal address and I will send you a CD copy of the Mike Woodhouse article on ribless construction. It’s in PDF format an at 6 meg and will take for ever to transmit on dial up. Share the info with Phil.

Cheers
Ployd

Hi,cen you send me this article on my mail: v.mora@seznam.cz ? thanks you

[Anonymous]

Hi Vita

I will have Dave Ackery send you a copy.

Cheers,
Ployd

[Anonymous]

There is also an article in th UK Free Flight Forum of 1995 by Chris Edge and Mike Fantham which describes this process. In essence you lay up a cloth d-box as normal but with an additional layer of ud material running chordwise in the middle of the laminate. The only real difference you have from a useability viewpoint is that the resultant shell is much stiffer than just a cloth construction hence your moulds must be an accurate represtation of the airfoil; a a cloth shell has more compliance.

[MIKE SZURA]

Dave,
Just completed ribless d-boxes for F1A, 2.2 meter. Carbon and spec
kevlar laminate. Basic premise used is the same as in the article.
Let me know if there is interest and details will be shared.
Regards,
Mike

[Author]

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