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Typical weight estimation data is pretty old today, like the one in Raymer's book. I think it would be useful to have statistics of modern aircraft airframe weight statistics split by at least major component, or in minimum the total empty weight of the airframe minus engine and minus propeller...

I have been talking about long range concepts before but there is another category where there is a hole on airplane market, such plane does not exist today (that would be available): - Practical everyday commuter that is geared towards the fact that airports are closing and also airports are...

We once had a discussion couple of years ago with couple of aircraft builders at SIL Talvipäivät (equivalent of EAA Finland, and a yearly gathering of experimental builders and enthusiasts, much smaller scale than EAA though) about my specifications for the personal HALE-cruiser/personal...

I have been concentrating on aerodynamics for years and have avoided the structural design part quite completely. However now I would like to get started on it too. Before going to complicated stuff I would like to understand the relations of length, mass and force (as generated by drag due...

I was watching a video about some EADS concept jet where the jet engines were replaced with electric ducted fans. And actually several such ducted fans instead of like two. And I was also looking some unducted fan information at the same time. And what we know is: - it is beneficial to move a...

Hi CriCri is an example of props in pylons. However, what about pylons in aft fuselage? TT62 Alekto is example of that. It is unclear why it failed, was it due to mechanical problem or aerodynamic problem? Will the pylons function as additional unwanted tails with moment arm clearly aft from CG...

Hi Short question: - would somebody find useful a conceptual design software if it ran on iPad? Long time ago I was writing one for Mac, but then switched on doing Excel-sheets. Situation is as everybody knows, the software would have nothing else but calculate large number of formulas that you...

Hi, I made Facebook album (that is public to everyone) about the Flynano (the sub-70 kg ultralight airplane) unveiling event. Flynano verkkokauppa.com | Facebook If you are interested to take a look on Flynano proto, check it out. Best Regards, Karoliina

I have been experimenting with mold fabrication with CNC. The most inexpensive material for the block to be carved happens to be the blue styrofoam. However its melting properties causes a surface finishing problem. I have figured out that I can directly paint over the foam using solvent free...

I have been thinking about vtol concepts out of the box since they would have their place in aviation, a gap currently unfilled. If we forget issues of combustion engines and consider an electric vtol. With today's batteries outcome will not be that useful, batteries are too heavy, but there...

Hi, There has been some back and forth discussion about ducted fans in general in this forum and elsewhere. Usually the limitations come from the engine that turns the fan. In general it has been concluded that the efficiency of a ducted fan is lower than a prop, except I have seen Orion...

About instrumentation of a RC model if you want to build one to obtain some test data without access to a wind tunnel: You should be able to add instrumentation to RC model and use for example embedded hardware called Arduino to deal with the data. The cost of these parts is very small compared...

So I thought that Jay's thread gets hijacked if this thing is continued to be discussed there, so I opened a new thread. So consider this (if the initial requirements were) and we leave out all hybrid propulsions from this speculation at this time: - Typical cruise altitude 25000 ft. Service...

Rutan tribute day in Oshkosh 2011. This video is about Burt Rutan and his aircraft designs. Burt tells about how he wanted to do space flight from Oshkosh. Starship and Boomerang flying on the video. Mike Melvil flying Boomerang and Bob Scherer flying the Starship. Link to the video: Burt Rutan...

Link to the video here: Synergy aircraft presentation, Oshkosh 2011 - YouTube

Link to the video I recorded: Burt Rutan Bipod update, Oshkosh 2011 - YouTube The Bipod is a roadable airplane or flying car, whichever way you want to put it. It uses hybrid electric-gasoline -propulsion. Unfortunately I had to shoot it from the side. I setted up my camera in the middle at...

Hello, I am thinking of a concept which is targeting at both high AR and very good empty to gross weight ratio at the same time. The weight of the resulting wing will pretty much dictate the feasibility of the concept. I want to calculate the weight based on actual materials that are going to...

Video John Roncz: Inside story about Rutan designs. Airventure 2011, Oshkosh :http://youtu.be/E9eEwyVrAps?hd=1 Link: John Roncz: Inside story about Rutan designs. Airventure 2011, Oshkosh. - YouTube Some people here were wishing for this video, and here it is. Enjoy!

http://youtu.be/nMuHh44upfA?hd=1 Link: John Roncz Presentation Airventure 2011 - YouTube

I recorded the presentation: http://youtu.be/xNUGKCBtTIA?hd=1 Link: http://youtu.be/xNUGKCBtTIA?hd=1