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Old 11-09-2018, 11:21 AM   #91 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
I fail to see how they have the same thrust as a long aspect rato prop that uses the same input power.

I also don't understand what the patent is about. ROHR was doing similar things 25 years ago
I view it as more of an adaption of the Turbo-Fan as it is basically an electric jet motor, something I've been interested in for the last 15-20 years or so for my hovercraft designs that I do for fun.

Here is what I mean, in lieu of the fan part of the turbo-fan they have only an annular inlet (w/folding plates).

In lieu of the turbine element of the turbo-fan they have a fan or propeller.

https://en.wikipedia.org/wiki/Turbofan


I'm sure at some time in the past some testing facility modeled or tested a turbo-fan with the fan removed using only the center turbine part.

This would be a jet engine with shrouded air cavity where air could be squeezed or expanded depending on velocity and pressure desired when it merges with the jet gasses at the end. Sort of a Ram Jet but not quite.

As I understand it, in a turbo-fan the fan produces 90% of the thrust, the turbine and hot jet exhaust only the remaining 10% but I could be wrong (flying off of memory here).

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Old 11-09-2018, 11:32 AM   #92 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
I fail to see how they have the same thrust as a long aspect rato prop that uses the same input power.

I also don't understand what the patent is about. ROHR was doing similar things 25 years ago
ROHR was just a ducted fan/propeller from what I can tell, a very cool one though.

Using the search term "Hoversurf" in Google Patents I could not find anything.

I'd like to see their patent, please post it if you find it - that goes out to anyone reading this. I have to get back to work.
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Old 11-10-2018, 04:28 PM   #93 (permalink)
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Quote:
Originally Posted by kach22i View Post
I'm sure at some time in the past some testing facility modeled or tested a turbo-fan with the fan removed using only the center turbine part.

This would be a jet engine with shrouded air cavity where air could be squeezed or expanded depending on velocity and pressure desired when it merges with the jet gasses at the end. Sort of a Ram Jet but not quite.
You're essentially describing the J58 engine in the A12 / YF-12 / SR-71 Blackbird ...
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Old 11-11-2018, 10:28 AM   #94 (permalink)
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Quote:
Originally Posted by euromodder View Post
You're essentially describing the J58 engine in the A12 / YF-12 / SR-71 Blackbird ...
Kind of, minus the introduction of fuel at the end called an afterburner of course.

Pratt & Whitney J58
https://en.wikipedia.org/wiki/Pratt_%26_Whitney_J58
Quote:
The J58 was a single-spool turbojet with an afterburner.[1] It had a unique bleed from the compressor to the afterburner which gave increased thrust at high speeds.[2] This feature caused it to be referred to as a turboramjet in some writings.
Doing a search on the turboramjet topic I found a combination that I have never seen before.

Commercial Near-Earth Launcher: Propulsion Choices
https://link.springer.com/chapter/10...-662-54744-1_4


The point of this discussion I believe is to explore the introduction or reintroduction of airflow and or pressure differentials at the nozzle exhaust of a ducted fan/propeller/jet thrust system.

These gadgets or approaches are every bit as important as business at the front end, typically the increases in efficiency of a bell-mouth curve inlet.

EDIT:
I found a video showing the electric fan (cold jet - my own term) Venturi engine by Hoversurf.


Flying car scale model first test flight using Venturi EDF

Quote:
Hoversurf is well known for our Hoverbike. We know that propellers scare people and for the last few years we have been working very hard on our patented Venturi EDF technology. We are excited to present our 1:10 scale model of our future flying car that utilizes our Venturi EDF. This technology is safer, more compact, eco friendly and will replace propellers on all our future products. Thank you to all our subscribers and for your comments, we look forward to changing the future together.
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Last edited by kach22i; 11-11-2018 at 10:34 AM..
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Old 11-17-2018, 04:56 PM   #95 (permalink)
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http://justacarguy.blogspot.com/2018...with-this.html

Boxed cavity on a Porsche 356.
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Old 11-17-2018, 08:27 PM   #96 (permalink)
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Quote:
Originally Posted by freebeard View Post
Boxed cavity on a Porsche 356.
I saw pictures of that before but did not really consider it a box cavity until you pointed it out.

Thanks for the link, I never saw the front before.
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Old Yesterday, 09:38 AM   #97 (permalink)
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This looks like too much fun, he has the quick fabrication skills for doing experiments that I admire.

He's moving air, so it is aerodynamically related.

Blower impeller design experiments

Quote:
Comparing forward curved blades, backward curved blades and straight blades for a blower impeller.
I see now why hovercraft use the straight and backward curved for high pressure lift fans.
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George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
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Chin Spoiler:
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Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html

Last edited by kach22i; Yesterday at 09:45 AM..
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Old Yesterday, 05:38 PM   #98 (permalink)
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Old Yesterday, 10:37 PM   #99 (permalink)
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