GWTW Forum

Kites! Kites! Kites! => Kite Building and Repair => Topic started by: Stuart99 on February 24, 2011, 11:45 AM



Title: Structil?
Post by: Stuart99 on February 24, 2011, 11:45 AM
I am going to try to build a kite in the near future. I see a lot of plans call for 6mm Structil as framing and I am having a hard time finding it for sale on the web. Is it the same as the .240 pultruded carbon that our gracious host has for sale?


Title: Re: Structil?
Post by: Allen Carter on February 24, 2011, 12:00 PM
Structil is a brand name for carbon tubes. The standard weight tubes are similar to the Avia pultruded tubes available here. .2300 is generally the best equivalent to a 6mm tube. Structil also makes a high modulus product which is fairly unique these days. Lighter and stiffer than equivalent diameter standard tubes. It's specified in some plans. Benson and some other makers across the pond have used it here and there. The larger diameter Skyshark Pxxx series is the normal replacement for high mod, but you have the make sure it will fit where the smaller diameter pultruded was intended.


Title: Re: Structil?
Post by: Hadge on February 24, 2011, 12:34 PM
You don't say where you are. Structil is available in the UK - if this is any use to you PM me and I'll send you the link.  If not, any decent 6mm carbon tube would probably be OK.


Title: Re: Structil?
Post by: Stuart99 on February 24, 2011, 12:53 PM
Mid East USA


Title: Re: Structil?
Post by: Michel on February 24, 2011, 01:38 PM
Structil is a brand name for carbon tubes. The standard weight tubes are similar to the Avia pultruded tubes available here. .2300 is generally the best equivalent to a 6mm tube.

I think that 6 mm is .2400" and 5.9 mm is .2300"

Structil is a bit stiffer and lighter than Avia tubes.

The weight for Structil spars for 1 meter in g/m were given to me some years ago by the Structil Company :

W = ([D + d] x [D - d]) x 1.255   <- weight in grams/ meter

That means for example for a 6 mm O.D. diameter and 4 mm I.D. diameter tube : ([6 + 4) x [6 - 4)]) x 1.255 = 20 x 1.255 = 25,1 g/m

Quote
Structil also makes a high modulus product which is fairly unique these days.

Hi-modulus Structil were very good spars but they are no more available. :'(


Title: Re: Structil?
Post by: DWayne on February 24, 2011, 02:30 PM
.2400 is 6.10mm
.2300 is 5.84mm

Denny


Title: Re: Structil?
Post by: UPNET on February 24, 2011, 03:45 PM
Which kite are you thinking of building?


Title: Re: Structil?
Post by: Allen Carter on February 24, 2011, 04:05 PM
.2400 Avia are not a good alternate for 6mm because they are heavy and not very stiff for their weight. .2300s are the standard size pultrudes. You can use a .2300 with 6MM fittings in a pinch, or sometimes the only options are 6 & 7mm fittings.


Title: Re: Structil?
Post by: Steve Hall on February 24, 2011, 04:57 PM
If weight is a concern you might want to consider .2300 "thinwall". It will save you 3 grams per 32.5" stick.  Same price as the standard .2300 pultruded.
Drop me an email if you want to go that direction.


Title: Re: Structil?
Post by: Stuart99 on February 24, 2011, 05:39 PM
Possibly a Le Quartz


Title: Re: Structil?
Post by: UPNET on February 24, 2011, 06:11 PM
I think Denny built one of those.