http://groups.yahoo.com/group/ductfan/ Ducted Propulsors Fri, 23 Oct 2009 14:05:35 GMT n141sf http://groups.yahoo.com/group/ductfan/message/2532 http://groups.yahoo.com/group/ductfan/message/2532 There appears to be some sort of high RPM "vane axial blower" inside the columnar structure somewhat like the vacuum cleaners Dyson designs. That sort of makes Fri, 23 Oct 2009 14:01:41 GMT Lewis Blomeley http://groups.yahoo.com/group/ductfan/message/2531 http://groups.yahoo.com/group/ductfan/message/2531 Just out of curiosity, would this thing work if you fed it shop air instead of it having its own pumping fan? We carry about 90 psi from a large scroll Fri, 23 Oct 2009 03:29:50 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2530 http://groups.yahoo.com/group/ductfan/message/2530 There's a high pressure, low volume blower in the pedestal of the device, feeding the primary-flow slot. Marc Fri, 23 Oct 2009 03:23:21 GMT Danny Miller http://groups.yahoo.com/group/ductfan/message/2529 http://groups.yahoo.com/group/ductfan/message/2529 Isn't there a primary air mover in there somewhere? Probably not with a significant pressure rise, but a fan that moves the air? AFAIK that's what's going on Fri, 23 Oct 2009 01:54:29 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2528 http://groups.yahoo.com/group/ductfan/message/2528 A ducted fan makes very good sense in any low speed, high thrust application. The question is, is the Dyson ejector an adequate substitute for a ducted fan? Thu, 22 Oct 2009 15:20:03 GMT n141sf http://groups.yahoo.com/group/ductfan/message/2527 http://groups.yahoo.com/group/ductfan/message/2527 I keep thinking of a light, quiet, efficient glider tug. The flight envelope is 40 - 75 knots with emphasis on strong acceleration in the takeoff roll and a Thu, 22 Oct 2009 09:26:55 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2526 http://groups.yahoo.com/group/ductfan/message/2526 No idea about performance. Technically, it's not a fan at all, but a Coanda ejector. Marc Tue, 20 Oct 2009 22:43:26 GMT n141sf http://groups.yahoo.com/group/ductfan/message/2525 http://groups.yahoo.com/group/ductfan/message/2525 See: http://www.dyson.com/fans/ I can't see buying one for the asked price but the idea is intriguing. Is this a possible propulsor? What sort of thrust might Sat, 03 Oct 2009 07:28:04 GMT Danny Miller http://groups.yahoo.com/group/ductfan/message/2524 http://groups.yahoo.com/group/ductfan/message/2524 Well, if altitude permitted, a ballistic reserve chute would be dandy. Unlike a helicopter, there's no spinning rotor overhead to complicate that plan. This Sat, 03 Oct 2009 07:14:28 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2523 http://groups.yahoo.com/group/ductfan/message/2523 ... If you believe that, I have some riverfront land you'd be interested in. Generally, the higher the disk loading, the better the high end and the worse it Sat, 03 Oct 2009 07:11:57 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2522 http://groups.yahoo.com/group/ductfan/message/2522 Dear Jack, ... George is fine, but basically he got so busy with what started as a part-time business and became a huge success that he dropped his Sat, 03 Oct 2009 06:59:13 GMT F. Marc de Piolenc http://groups.yahoo.com/group/ductfan/message/2521 http://groups.yahoo.com/group/ductfan/message/2521 Autorotation on a rig like this is out of the question. The best solution for a flameout of the gas generator is to either provide more than one gas generator Sat, 03 Oct 2009 06:11:11 GMT Danny Miller http://groups.yahoo.com/group/ductfan/message/2520 http://groups.yahoo.com/group/ductfan/message/2520 Specifically, I was referring to trying to compare the hypothetical performance of an updated Avrocar to a helicopter when there is no working model to Sat, 03 Oct 2009 04:24:47 GMT John H. (Jack) Wiegman http://groups.yahoo.com/group/ductfan/message/2519 http://groups.yahoo.com/group/ductfan/message/2519 Danny, It is not a pointless question! That general shape would have been reasonable had it been possible to close what I think were some of the jets or pipes. Sat, 03 Oct 2009 04:12:16 GMT John H. (Jack) Wiegman http://groups.yahoo.com/group/ductfan/message/2518 http://groups.yahoo.com/group/ductfan/message/2518 Marc, I corresponded with George years ago and he promised to let me know where/how to get better info on Avrocar but he disappeared from the horizon. Can you