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On Feb 3, 8:48*am, bod43 wrote:
On 28 Jan, 04:46, bildan wrote: On Jan 27, 9:27*pm, Orval Fairbairn wrote: In article , *bildan wrote: Take a look at this: http://www.fairdiesel.co.uk/ One thing I like is the pistons can be held at TDC for the whole injection interval. *That removes one of the big issues for high RPM diesels. They mention an improvement in efficiency is possible but don't give any numbers. I suppose that for an essentially fixed speed application such as an aircraft engine the cam profile could be selected to optimise efficiency at that speed. Interesting. ....the dyna cam engine, which is what the diesel design is based on, was originally designed during WW2 to power torpedoes. ergo, when first designed, component life was not an issue beyond a minute or so... and anyone with a father, uncle or grandfather who sailed on ww2 pig boats who passed down war stories will attest to how reliable our torpedoes weren't. pat wilks and dennis palmer formed a corporation during the 80s to develop the technology for light aircraft, and flew an Archer around to airshows to promote it. Then they got into a pi$ $ing match with a company call axial vector technologies (originally over licensing the technology to axial), and lost the right to further develop (or for that matter even talk about) the engine. bottom line: very smooth, tons of torque at 1800 - 2000 rpm (and 200 horsepower), nice exhaust note, but also very heavy and with substantial cooling problems that were never remedied. |
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