Roadable Aircraft DESIGN

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Holden

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Fair go ! Henryk is posting what looks like properly conducted research and seems to have a base of scientific results -- at least give him the courtesy of a respectful hearing and forgo the insinuations. It should be obvious as to what such a technology has to offer roadability --anything that can reduce the size and bulk (volume) of a wing to create the same lift makes the attainment of a reasonably sized road package so much easier . Conversely ,the ability to fly slower makes the take off and landing runs shorter and thus opens up more options for places to get into and out of the air -- both the oversize of the 'folded/stowed ,or otherwise converted for road use, vehicle and the limitations of long runways way out of town have been show stoppers for the near entirety of previous attempts at a viable flying car --solving these issues is at the very heart of the problem.

The noise and vibration of the test set up might be drawbacks but not necessarily show stoppers if only existing for the last few seconds of flight --it is clear that the oscillating flap could be easily stopped and remain in place without being any great burden for the aircraft in cruise --unlike some of the other attempts at a stopped rotor or the many failed pumped boundary layer (eg Sikorsky X wing ) or such schemes .

From the simulation it looks like a vortex is formed with each oscillation which then drifts rearwards over the wing (with three in the length of the chord ) so it is like a travelling wave as against a standing wave -- if this indeed does result in the very high Cls shown on test data then it is well worth exploring .

One thing that stands out in most of the earlier flying car designs is the LACK of appreciation for the value of higher Cls on reducing the size of the flying surfaces and thence the road package -look at Molt Taylor's Aerocar for a good example (not even plain flaps to shrink the wing - the road size is a flying semi trailer rather than a car ) the Fulton airphibian, Convaircar, Terrafugia, Brown Carplane et all all exhibit this oversight.

Please don't be put off by the criticism Henryk.
Ok, this concept somehow makes for smaller wings, I assume, by making the flow dynamic in the local area and by maintaining attached flow for higher Cls.

Yes, I agree that higher Cls reduce the size of wings and that a roadable design that does not focus on reducing wing area while maintaining low landing speeds will not be successful.
 

delta

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Interesting ebay listing this morning. Northrop was interested in a roadable cargo carrier back in the 60's. http://i.ebayimg.com/t/Airplane-Concept-Prototype-Desk-Model-Northrup-Amphibious-US-Army-1960-Rare-/00/s/ODY4WDE2MDA=/z/JFMAAOxyAs9SOMLP/$(KGrHqVHJE!FIiUDcJGHBSOMLPidU!~~60_57.JPG?rt=nc
eBay item number:

181219424737
 

Aircar

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Interesting model --like to see a couple of other views for more idea of configuration and what the history was . There might be a whole unknown project behind this (the UK had 'project prodigal' to come up with a sort of jumping jeep to clear ditches or rivers, walls etc that stopped only wheeled vehicles --very short airborne range only being required )

Just came across a photo and reference to Taras Kiceniuk Jr proposing a roadable (model shown - tandem wings ) --he was one of the real pioneers of the hang gliding and ultralight boom in the early 70s --maybe somebody knows more about it .

The Fanwing looks to me to be just about UNroadable simply due to the inherent bulk of the spanwise cylindrical fan and fixed 'fairing' involved -- such devices are of technical interest but no practical use because of the mismatch (the bulky ducted fans on Moller's "Skycar" are similarly incapable of being folded or stowed away and are again inappropriate for the task )
 

Holden

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Just came across a photo and reference to Taras Kiceniuk Jr proposing a roadable (model shown - tandem wings ) --he was one of the real pioneers of the hang gliding and ultralight boom in the early 70s --maybe somebody knows more about it .

The Fanwing looks to me to be just about UNroadable simply due to the inherent bulk of the spanwise cylindrical fan and fixed 'fairing' involved -- such devices are of technical interest but no practical use because of the mismatch (the bulky ducted fans on Moller's "Skycar" are similarly incapable of being folded or stowed away and are again inappropriate for the task )
This article, Aircar? Tehachapi 2013 scroll down.

What about it do you like?
 

delta

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Interesting model --like to see a couple of other views for more idea of configuration and what the history was . There might be a whole unknown project behind this (the UK had 'project prodigal' to come up with a sort of jumping jeep to clear ditches or rivers, walls etc that stopped only wheeled vehicles --very short airborne range only being required )

Just came across a photo and reference to Taras Kiceniuk Jr proposing a roadable (model shown - tandem wings ) --he was one of the real pioneers of the hang gliding and ultralight boom in the early 70s --maybe somebody knows more about it .

The Fanwing looks to me to be just about UNroadable simply due to the inherent bulk of the spanwise cylindrical fan and fixed 'fairing' involved -- such devices are of technical interest but no practical use because of the mismatch (the bulky ducted fans on Moller's "Skycar" are similarly incapable of being folded or stowed away and are again inappropriate for the task )
Here's the link to the auction. Click on "see original listing" as the auction is now over. Airplane Concept Prototype Desk Model Northrup Amphibious US Army 1960 RARE | eBay
 

jtrealty

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Aircar

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Thanks Delta - it looks a bit nose heavy and quite boxy but nothing I recognize . Wonder if it was intended to be roadable (the duct at the rear overhang a fair way --wings might stow on top )
 

delta

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I"m sure it was meant to "do it all". Maybe the CG and the amazing lack of power is what killed its progress.
 

Topaz

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Moderator Note: At 1,631 posts (plus this one) and well over a hundred pages, this thread has gotten to be so long and wandering that I think the best thing to do is close it down and leave it as a reference on this topic. We can hardly expect new posters to read through the whole thing before they make a post :shock:, and the fact that material is duplicated in the thread several times shows that's already happening.

The "Summary" thread on the same topic would be a good place for those involved to - as the OP there suggests - summarize their viewpoints and move the discussion forward in that thread.

Any time you want to reference this thread, it will be here. You can reference (link) to either the entire thread or an individual post. If you need help with that, either post the question in the Technical Problems section or contact one of the moderators.

Thread Closed.
 
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