tag:blogger.com,1999:blog-8321804912236998273.post8516479704400207125..comments2023-06-27T16:25:50.532+03:00Comments on DESIGN|A|PLANE: New variant of the shape I have been thinking aboutAnonymoushttp://www.blogger.com/profile/08473990027098421362noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-8321804912236998273.post-16010318564770984452008-12-11T10:46:00.000+02:002008-12-11T10:46:00.000+02:00On the other hand, the Goldschmied tubular fuselag...On the other hand, the Goldschmied tubular fuselage has to be compared with lift producing BWB center section equipped with suction the comparison to be fair. It might turn out, that with suction, the BWB center section turns out more efficient. However, I do not know for sure without studying further.Anonymoushttps://www.blogger.com/profile/08473990027098421362noreply@blogger.comtag:blogger.com,1999:blog-8321804912236998273.post-19407822648175608522008-12-11T10:43:00.000+02:002008-12-11T10:43:00.000+02:00Allen - the Goldschmied fuselage would work with a...Allen - the Goldschmied fuselage would work with a tubular cross section. I need to compare it with the BWB, might be that the tubular cross section for the planned use case is:<BR/>- simpler (does not require separate pressure hull)<BR/>- more easily pressurized<BR/>- can benefit from pressure thrustAnonymoushttps://www.blogger.com/profile/08473990027098421362noreply@blogger.comtag:blogger.com,1999:blog-8321804912236998273.post-29730556019781386052008-11-29T11:30:00.000+02:002008-11-29T11:30:00.000+02:00Thanks for your comments!Well, I have a different ...Thanks for your comments!<BR/><BR/>Well, I have a different approach: <BR/>This is a configuration layout and I am not in detailed design yet. In detailed design I need to pay attention how to fit everything inside, but at the moment I have no such requirement as I am lofting to get my initial configuration layout ideas illustrated and documented (instead of sketching them by hand).<BR/><BR/>The blend function in CAD software does not do aerodynamically accurate blend. In my picture, every cross section is an airfoil (it is not drawn to scale though yet and it is not yet based on any of my calculations, these can not be yet accurate because I haven't chosen the airfoils (there needs to be couple of different airfoils over the span)).<BR/><BR/>In detailed design later for sure, I will place virtual people and virtual engine on their places when doing the loft. Wing spar will fit very easily to the blended part and the rest of the wing is like a sailplane wing with at least 14...15% thickness. <BR/><BR/>I plan to loft the engine nacelles to the wings, similarly than they are blended in the SR71. However, there are remaining issues with this blended idea. For example a large propeller for each engine is needed for my design point and the blended idea works best as a low wing or mid wing configuration. This in turn requires long landing gear legs. Long landing gear legs add weight, and unnecessary weight hampers performance (and causes a requirement for a bigger engine). It is going to be lots of optimization to reach a synergestic design rather than just put a tube, cone, wings and somehow join them. The intended target requires a lot more than that.Anonymoushttps://www.blogger.com/profile/08473990027098421362noreply@blogger.comtag:blogger.com,1999:blog-8321804912236998273.post-26244413334806496732008-11-27T22:47:00.000+02:002008-11-27T22:47:00.000+02:00With the most CAD software you can use "blend" ope...With the most CAD software you can use "blend" operation for joining fuselage body with the wing root. But the better way is to use "loft" operation covering a 3D wireframe model developed from controlled cross-sections and longitudinal splines.<BR/>But for the begining you need to develope an internal layout of fuselage - put in place pilot(s), equipment, structure elements (wing spar, for example), powerplant, etc. and only after that you may cover them with external shell.<BR/>In any case - good job, Karolina.<BR/>I like it!Kestashttps://www.blogger.com/profile/12941970507627356227noreply@blogger.comtag:blogger.com,1999:blog-8321804912236998273.post-60833111276186229142008-11-26T06:07:00.000+02:002008-11-26T06:07:00.000+02:00Have you looked into a Goldschmied fuselage. They...Have you looked into a Goldschmied fuselage. They claim that a Goldschmied fuselage generates negative drag.Unknownhttps://www.blogger.com/profile/00993870041448565840noreply@blogger.com