SS2/WK2 news pending....

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Aluminum isn't really <i>necessary</i> since varying the paraffin used can make even greater changes in performance. IOW paraffin can be very green.<br /><br />Another additive is carbon black or an another material with high optical absorptivity, the purpose of which is to insure that most radiative energy is absorbed at the fuel grains surface, preventing deformation. <br /><br />Then there's stearic acid which can harden the grain. <div class="Discussion_UserSignature"> </div>

 

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WK2 may have more in common with Global Flyer or the F-82 Twin Mustang than WK1.<br /><br />Link....<br /><br /><blockquote><font class="small">In reply to:</font><hr /><p>><br />the jet-powered WK2 is a total redesign. The first mother ship had a single fuselage. The new one accommodates the expanded ship with twin hulls that hold the SS2 suspended between them. The interior of one hull is a replica of the SS2: Passengers will ride along in training for a full-on space voyage the next day. FAA permitting, the second hull will carry cut-rate day-trippers into the stratosphere. The vehicle is being engineered to perform zero-g aerobatic swoops on the way down.<br /> /><p><hr /></p></p></blockquote> <div class="Discussion_UserSignature"> </div>