02-25-2021, 08:56 AM
|
#651 (permalink)
|
Master EcoModder
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 4,171
Thanks: 124
Thanked 2,799 Times in 1,967 Posts
|
February 16, 2021
The Design of the Celera 500L
https://www.flyingmag.com/story/airc...a-500l-design/
Quote:
The Celera’s fuselage shape is intended to achieve as much laminar flow as possible.Courtesy Otto Aviation
|
Quote:
This oddity has now made its formal debut.
|
Quote:
The principal claim made for the Celera is that it supports an unusual amount of laminar flow and therefore has unprecedentedly low drag.
|
__________________
George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
|
|
|
The Following User Says Thank You to kach22i For This Useful Post:
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
02-25-2021, 09:29 AM
|
#652 (permalink)
|
Master EcoModder
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,796
Thanks: 226
Thanked 1,353 Times in 711 Posts
|
Quote:
Originally Posted by kach22i
|
Excellent post...
Full information can be found here:
https://www.ottoaviation.com/celera-500l
Quote:
RED A03 Engine Specifications
Liquid cooled V12, twin 6-cylinder bank, capable of independent operation with mutually independent critical engine sub-systems for each bank
Type certification approval granted via EASA (TC.E.150) and FAA (E00092EN)
Certified to operate on readily available Jet A1 and biodiesel
Capable of 550+ takeoff horsepower and best-in-class fuel efficiency
Controlled via fully redundant electronic engine control unit with single power control lever reducing pilot workload
Lightweight, all-aluminum design
|
Quote:
Gliding Capability
The Celera 500L has a glide ratio of 22:1 (typical GA aircraft of similar size have a glide ratio of < 9:1). At an altitude of 30,000ft The Celera 500L can glide up to 125 miles with no engine power. This is roughly 3x better than the typical aircraft.
|
Super cool 😎...
Thanks for posting...
>
.
__________________
Woke means you're a loser....everything woke turns to ****.
Donald J Trump 8/21/21
Disclaimer...
I’m not a climatologist, aerodynamicist, virologist, physicist, astrodynamicist or marine biologist..
But...
I play one on the internet.
|
|
|
02-25-2021, 09:49 PM
|
#653 (permalink)
|
It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,679
Thanks: 0
Thanked 1,653 Times in 1,473 Posts
|
That engine seems quite complex, but it's still an interesting design. On a sidenote, since the U.S. seized blueprints of DKW motorcycles as part of the war reparations, it does surprise me how aeronautical Diesel engine designs from companies such as Junkers fell out of favor within the U.S. aircraft industry by then.
|
|
|
02-25-2021, 11:12 PM
|
#654 (permalink)
|
EcoModding Apprentice
Join Date: May 2008
Location: N. Saskatchewan, CA
Posts: 1,805
Thanks: 91
Thanked 459 Times in 327 Posts
|
Quote:
Originally Posted by cRiPpLe_rOoStEr
That engine seems quite complex, but it's still an interesting design. On a sidenote, since the U.S. seized blueprints of DKW motorcycles as part of the war reparations, it does surprise me how aeronautical Diesel engine designs from companies such as Junkers fell out of favor within the U.S. aircraft industry by then.
|
No turbocharger is mentioned, even for high-altitude work. The Napier Nomad gave the best mileage in the 50s, and was more like a turbo jet with the peak temperatures moderated by using pistons for the initial expansion.
Cylinders that are not in use still create friction with this setup. I don't think anybody liked that 4-6-8 Cadillac option.
__________________
There is no excuse for a land vehicle to weigh more than its average payload.
|
|
|
02-26-2021, 08:06 AM
|
#655 (permalink)
|
Thalmaturge
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 1,160
Thanks: 764
Thanked 640 Times in 427 Posts
|
Quote:
Originally Posted by Bicycle Bob
No turbocharger is mentioned, even for high-altitude work. The Napier Nomad gave the best mileage in the 50s, and was more like a turbo jet with the peak temperatures moderated by using pistons for the initial expansion.
Cylinders that are not in use still create friction with this setup. I don't think anybody liked that 4-6-8 Cadillac option.
|
Not in that article, but it is there.
https://www.boldmethod.com/blog/list...tionary-plane/
Quote:
Piston-Powered RED A03 V12 Engine
The A03 has a multi-stage turbocharger and can run on Jet-A fuel, kerosene, or biodiesel. It's an extremely high-efficiency design with low fuel consumption and increased reliability over existing piston engines.
|
![](https://ecomodder.com/forum/attachment.php?attachmentid=30238&stc=1&d=1614345039)
|
|
|
02-26-2021, 01:20 PM
|
#656 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,255
Thanks: 7,962
Thanked 8,788 Times in 7,247 Posts
|
Quote:
Originally Posted by CR
That engine seems quite complex, but it's still an interesting design
|
Two redundant banks on a common crankshaft. If I understand correctly, it's to get twin engine reliability. This suggests the crankshaft is the most reliable part.
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________
.
.“You belong to Universe” -- the voice in Bucky Fuller's head
|
|
|
02-26-2021, 04:49 PM
|
#657 (permalink)
|
It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,679
Thanks: 0
Thanked 1,653 Times in 1,473 Posts
|
Quote:
Originally Posted by Bicycle Bob
Cylinders that are not in use still create friction with this setup. I don't think anybody liked that 4-6-8 Cadillac option.
|
This is meant to increase redundancy as a safety measure, not as a fuel-saving attempt.
|
|
|
02-26-2021, 04:53 PM
|
#658 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,255
Thanks: 7,962
Thanked 8,788 Times in 7,247 Posts
|
This is an aerodynamic oddity so I'll drop it here.
I've mentioned a few time that R. B. Fuller advocated for indoor windmills. I've always liked the idea. Here's someone who gets it.
www.euronews.com/living/2020/09/30/could-this-be-the-safest-most-powerful-wind-turbine-in-the-world
It's not clear about their hubless rotor design but the converging duct is the key. This needs to be embedded at the zenith of a sizable hemisphere. Then the guide vanes can be extended to increase that 40% factor. Putting it on top of the hemisphere increases the nominal wind speed even more.
It appears to be a 1kW device. There is a Kickstarter page, but it doesn't like Raspian's system clock.
_________________
Maybe more on-topic, I found thing looking for something else:
historysdumpster.blogspot.com/2016/05/1930s-traveling-movie-theater.html
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________
.
.“You belong to Universe” -- the voice in Bucky Fuller's head
Last edited by freebeard; 02-26-2021 at 05:14 PM..
|
|
|
02-26-2021, 05:04 PM
|
#659 (permalink)
|
EcoModding Apprentice
Join Date: May 2008
Location: N. Saskatchewan, CA
Posts: 1,805
Thanks: 91
Thanked 459 Times in 327 Posts
|
Quote:
Originally Posted by freebeard
This is an aerodynamic oddity so I'll drop it here.
I've mentioned a few time that R. B. Fuller advocated for indoor windmills. I've always liked the idea. Here's someone who gets it.
www.euronews.com/living/2020/09/30/could-this-be-the-safest-most-powerful-wind-turbine-in-the-world
It's not clear about their hubless rotor design but the converging duct is the key. This needs to be embedded at the zenith of a sizable hemisphere. Then the guide vanes can be extended to increase that 40% factor. Putting it on top of the hemisphere increases the nominal wind speed even more.
It appears to be a 1kW device. There is a Kickstarter page, but it doesn't like Raspian's system clock.
|
Yet, every single analysis shows that unless you are dealing with limited space or other exotic conditions, you always get more bang for the buck by taking material from the ducting and adding it to the turbine.
That said, if I were buying wind turbines, I'd save time and money by using guy wires on the tower below the turbine blades, and add a fairing to the upper tower that turns with the power head. The blades would probably also benefit from short guy wires. Anyone who has put up a dodgy shelf should be able to appreciate the potential savings.
__________________
There is no excuse for a land vehicle to weigh more than its average payload.
|
|
|
02-26-2021, 05:27 PM
|
#660 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,255
Thanks: 7,962
Thanked 8,788 Times in 7,247 Posts
|
Quote:
I'd save time and money by using guy wires on the tower below the turbine blades, and add a fairing to the upper tower that turns with the power head.
|
What does the tower do? It gets you above the microclimate. What does the hemisphere do? It draws air movement down into the microclimate.
Fuller's Dymaxion House had a rotating fairing, but it only exhausted interior air.
socalarchhistory.blogspot.com/2011/12/structural-similarities-in-work-of.html
Quote:
The blades would probably also benefit from short guy wires. Anyone who has put up a dodgy shelf should be able to appreciate the potential savings.
|
Not getting that at all. The rotor is wired like a bicycle wheel?
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________
.
.“You belong to Universe” -- the voice in Bucky Fuller's head
Last edited by freebeard; 02-26-2021 at 10:24 PM..
Reason: fixed an image liink
|
|
|
|