[kach22i]

Originally Posted by gordner

There are detection systems for wheel bay fires but not usually supression systems.
And wheel fires occur on take of as well as landing, it can be a result of hot brakes from a long taxi or a bearing failure causing overheat, or a locked brake leading directly to tire ignition. That is why they have the detection systems in place.

I recently watched a X-Prize special featuring the Burt Rutan effort. The main fuel in the rocket booster was a long rubber tube.


http://www.nbcnews.com/id/5226424/ns/technology_and_science-space/t/historic-rocket-powered-rubber-fuel/#.Uyi8mKhdU7k

SpaceShipOne officials have chosen SpaceDev's hybrid rocket propulsion system, shown here during an engine test. The system uses nitrous oxide and a rubber component known as HTPB.