Propeller design reinvented

Last edited:
And what is really interesting is the USN has just contracted an Australian company to secure their leading edge 3D printing technology, including the likely ability to 3D print submarine propellers.
 
Last edited:
Similar?
techxplore.com

Propeller advance paves way for quiet, efficient electric aviation

Electrification is seen as having an important role to play in the fossil-free aviation of tomorrow. But electric aviation is battling a trade-off dilemma: the more energy-efficient an electric aircraft is, the noisier it gets. Now, researchers at Chalmers University of Technology, Sweden, have...
techxplore.com techxplore.com
 
I dont think so, they are using more blades, but not a totally different design. MT is following this path as well (I guess we allready have a video of a nine blade MT Prop somewhere here)
 
May I suggest a toroidal biplane racer?
The top wing would look like an exageration of the (currently popular) Schumann planform with wing tips curving down to meet the bottom wing.
The bottom wing would be a reverse Schumann planform to capture vortices shed by the top wing and channel those vortices towards wing root. The bottom leading edge would be a complex, curved forward sweep with even more forward sweep in the curved trailing edge.
Forget about making this in wood and fabric.
To derive all of the aerodynamic benefits, you would need to 3D mill female molds, then lay up composite (perhaps graphite) skins within the molds.
Hint: Greg Catto (of propeller fame) had already built composite wings for several Formula One racers that competed at Reno.
 
riggerrob said:
May I suggest a toroidal biplane racer?
The top wing would look like an exageration of the (currently popular) Schumann planform with wing tips curving down to meet the bottom wing.
The bottom wing would be a reverse Schumann planform to capture vortices shed by the top wing and channel those vortices towards wing root. The bottom leading edge would be a complex, curved forward sweep with even more forward sweep in the curved trailing edge.
Forget about making this in wood and fabric.
To derive all of the aerodynamic benefits, you would need to 3D mill female molds, then lay up composite (perhaps graphite) skins within the molds.
Hint: Greg Catto (of propeller fame) had already built composite wings for several Formula One racers that competed at Reno.
Click to expand...
The problem you can run into in that case is the down wash from the forward higher wing changes the local alpha of the bottom wing, greatly reducing it's efficiency.
 
The zipdrone here has unusual double propellors on the same side:
View: https://m.youtube.com/watch?v=DOWDNBu9DkU&embeds_euri=https%3A%2F%2Fup-ship.com%2F&feature=emb_logo


I don’t know if that would scale up well…they look less like partially open scissors.


As a counter-weight…I might have the loop type propellor opposite the scissor type…perhaps given a twist to play with vortices a bit? How odd it might be that the perfect prop-design looks like the breast cancer ribbon loop:

goldenopenings.com

Giant Awareness Loop - Golden Openings

goldenopenings.com

That drone’s cloud-car might replace fast-roping if it scales up well.
 
Last edited:
Sundog said:
riggerrob said:
May I suggest a toroidal biplane racer?
The top wing would look like an exageration of the (currently popular) Schumann planform with wing tips curving down to meet the bottom wing.
The bottom wing would be a reverse Schumann planform to capture vortices shed by the top wing and channel those vortices towards wing root. The bottom leading edge would be a complex, curved forward sweep with even more forward sweep in the curved trailing edge.
Forget about making this in wood and fabric.
To derive all of the aerodynamic benefits, you would need to 3D mill female molds, then lay up composite (perhaps graphite) skins within the molds.
Hint: Greg Catto (of propeller fame) had already built composite wings for several Formula One racers that competed at Reno.
Click to expand...
The problem you can run into in that case is the down wash from the forward higher wing changes the local alpha of the bottom wing, greatly reducing it's efficiency.
Click to expand...
We are hoping that trapping wing tip vortices will provide a greater advantage than the loss due to biplane interference. The other issue is positioning the top and bottom wings far enough apart both vertically and staggered to minimize interference. Vertical spacing should be more than 1.5 chords. Horizontal staggering would displace top and bottom wing roots more than 1 chord.
Finally, we hope that firmly attaching wing tips we will gain a structural advantage.
 
Any chance of a graphic example please?
 
Are we looking at the DeLanne formula problem ? IIRC, Germans tried to reverse-engineer it from his nimble prototype, but could not get it right. Seems they got dysergy instead of synergy for the wings' interactions, were not amused. Subtle 'counter-intuitive for that era' stuff, perhaps ? The UK's Lysander conversion, done with DeLanne's approval, worked as intended....
 
Well it seems to work for ships props...

www.sharrowmarine.com

Sharrow Marine - The Propulsion Revolution is Here

The Sharrow Propeller™ offers a faster, quieter, and more fuel efficient ride through state-of-the-art design that is custom machined and fitted to every boat. Two-time award winner and the first major advancement in propeller technology since the 1830s.
www.sharrowmarine.com www.sharrowmarine.com
 
MihoshiK said:
Well it seems to work for ships props...

www.sharrowmarine.com

Sharrow Marine - The Propulsion Revolution is Here

The Sharrow Propeller™ offers a faster, quieter, and more fuel efficient ride through state-of-the-art design that is custom machined and fitted to every boat. Two-time award winner and the first major advancement in propeller technology since the 1830s.
www.sharrowmarine.com www.sharrowmarine.com
Click to expand...
I allready linked it in the second posting...
 

Similar threads

Back
Top Bottom