"Bladeless" Propulsion

[Mad MAC]

Hmmm, boast phase to achive ram jet speeds.

 

[Vigilant1]

Hmmm, boast phase to achive ram jet speeds.

I think "boast phase" is the term used to market unrealistic aerospace projects to naive investors through the use of questionable physics and engineering.

 

[Highplains]

Entrained air flow, a small tributary in fluid dynamics. I have seen the concept greatly increase the power in two cycle Schnuerle ported engines. As to this application, I don’t think there is enough duct area to significantly scale up to full size.

 

[Sockmonkey]

I think you would do better to use bleed air from a small gas turbine this to blow air through a slot along the upper surface of the wing to provide full-span USB lift in addition to thrust.
Then your engine and wing can be optimized for high-speed cruise and still have a reasonable landing distance.
When cruising, most of the bleed air would be fed back into the engine for horizontal thrust.

 

[Tiger Tim]

I think you would do better to use bleed air from a small gas turbine this to blow air through a slot along the upper surface of the wing

Like this?

Ball-Bartoe Jetwing - Wikipedia

en.m.wikipedia.org

 

[Dan Thomas]

Entrained air flow, a small tributary in fluid dynamics. I have seen the concept greatly increase the power in two cycle Schnuerle ported engines. As to this application, I don’t think there is enough duct area to significantly scale up to full size.

The effect on engines is de to the pulsating nature of the exhaust. Each pulse generates a wave in the duct that pulls the succeeding pulse out, improving scavenging and intake flow. Steady-state flow as in the Dyson fan doesn't get such benefits.

 

[Doran Jaffas]

This investment opportunity exists (and thrives) only in the same physics and logic universe as the cartoons most of us grew up with. Acme Products, Wile E. Coyote surviving a fall of 3000 feet and becoming an accordion, Daffy Duck surviving a shotgun blast to the face, etc.

Really when you think about it those were pretty violent shows for us tender age little ones. And now we have?? Anyway, gravity didn't really seem to play a part in the physics part of what happens to something when it falls that far or get shot at close range. Unlike airplanes that always are subject to the laws of physics no matter what they are.

 

[Sockmonkey]

Like this?

Ball-Bartoe Jetwing - Wikipedia

en.m.wikipedia.org

I'd wanna blow the full length of the wing instead of just the roots, but yeah.
You could possibly use an opposed-free-piston engine to generate the compressed air for a lower cost than a turbine.

 

[henryk]

de to the pulsating nature of the exhaust.

-iff instal EJECTION duse onto exhaust tube we can get some thrust augmentation...

 

[Sockmonkey]

-iff instal EJECTION duse onto exhaust tube we can get some thrust augmentation...

Yeah, that's how it works with pulse jets.

 

[Speedboat100]

Same as previous thread here: Propless ducted fan ?

Video has a different narrator.

 

[Dan Thomas]

Like this?

Ball-Bartoe Jetwing - Wikipedia

en.m.wikipedia.org

Which reminds us, once again, that there isn't much in aviation that hasn't been tried already. Spectacular new developments need spectacular new technologies.

Such as batteries with 50 times the current energy densities...

 

[leviterande]

Talking from extensive propulsion compressor/airflow redirection/coanda experiments. I can assure you - without trying to be insulting anyone - that this idea AT FULL SIZE if it ever "takes off" the required amount of power will make a Harrier in VTOL mode a glider in comparison and it would produce a heat/noise source to rival a volcano. Marketing is the word