We are selling some very nice carbon tubes that can be used to build your own custom ballast system. We have four different diameters of carbon tubing. Two of them are sized to accept our tungsten cylinders and the other two are sized to fit lead weights cast into copper plumbing sleeves. We are not currently selling cast lead weight. However, in the ballast specs, we list their weight as well as physical dimensions as a reference. The carbon tubes have been categorized so that you can easily find the proper size for your chosen ballast material.
The tungsten weights are the most convenient by far, they are pre made, have a higher material density than lead and are non toxic. The downside is cost. Lead is the economical choice for ballast but requires casting. The ballast tubes that we have provided for use with lead weights are sized to accommodate weights that have been cast into either 1/2" or 3/4" copper plumbing coupling sleeves. There are numerous places across the web to find information on casting your own weights. Please do your homework though, as mishandling this material is very dangerous.
A note about density vs atomic weight:
The Periodic Table tells us that tungsten has an atomic weight of 74 while lead has an atomic weight of 82. Typically, the heavier an atom is, the heavier a material will be when made from those atoms. Tungsten however is an exception to the rule due to the tighter arrangement of its molecules. This tighter arrangement results in a higher density material, 0.70 lbs/in3 vs. leads 0.410 lb/in3. The good news here, for glider pilots is, the ability to have greater mass in a smaller area.
- Currently we are stocking tungsten ballast cylinders in two different sizes.
Ballast Specs: diameter X length - weight :
The carbon tubes are constructed of a combination of unidirectional and woven carbon fabrics and are mandrel wound. The tubes can withstand rather extreme tension, compression and torsional loads as well as being very resistant to crushing and splitting.
Carbon Tube Specs: id x od x L
The Carbon tubes are also available in 330mm lengths.
Shipping Notes (applies to 1000mm tubes only):
USA Customers - Carbon Fiber can not be shipped via first class mail due to the length. You must ship carbon fiber via USPS Priority Mail or FedEx. Our shopping cart will offer first class mail, please do not select it.
International Customers - Carbon Fiber will not fit in a small box, and may get very expensive to ship. Our shopping cart may not accurately estimate shipping to your country. We will contact you if your order is not shippable.