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whiskey

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Everything posted by whiskey

  1. Doubling the chances of engine failure is not a major concern if you have more than one engine. The impact of asymetric thrust depends how much of it you have. For example the starship design has the engines placed close to the centreline to reduce this impact in a simple manner. Your chances of complete power loss is n squared where n is the chance of failure. From an engineering perpective are twins are significantly more complex than singles? Unless you are trying to cope with significant yaw issues relating to asymetric thrust. It is simply another engine, the engines are uncoupled. Of course I may be missing something. Cozy designs have been modified to have two engines in the past without significant reengineering. Their performance may have suffered because the impact of hanging a couple of engines on the wings wasn't fully appreciated but apart from that they were simple cozy variations. Is it possible to mount two engines on a cannard design in a manner where the yaw produced by a "low, slow and heavy" engine loss won't present significant risks? I suspect that it is possible.
  2. One of the enduring themes in the kit building arena is the certified vs auto engine debates. Badly installed auto engine experimentals have the ability to paint the entire kit building fraternity with a not entirely respectable image. (this may not be a bad thing) Given that auto engines are less reliable than certified engines. Why has there not been more emphasis on multiengined variants? With two power plants of suitable power output you go down the same path as hard disk manufacturers with RAID systems. Call it RAIE redundent array of inexpensive engines. Develop a standard mounts for a set of engines and the Certified vs Uncertified argument based around reliability dissappears. Personally I would love to see a diesel engine twin based around some of the light diesels becoming available
  3. Hi All A number of people appear to be considering modifications of the original designs. Has anyone generated mesh models that are suitable for utilising CFD analysis tools? It would be interesting seeing if standard designs can be modelled effectively using current tools. On a side note there was modeling work done on the badger that indicated that considerable efficiency gains are available over current designs.
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