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Old 02-22-2021, 11:49 PM   #11 (permalink)
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Nuclear Pulse Starship - Earth to Mars in 37 Days!

Better yet

Ultimate Nuclear Starship! 14 days to Mars! 60 days to JUPITER?

[Uranium salt water] Steampunk!

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Old 02-23-2021, 11:02 AM   #12 (permalink)
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So: 7 days acceleration, 7 days decelerating. Not a lot of time at speed which would have to be pretty fast or pretty far to do center cruise
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Old 02-24-2021, 08:25 PM   #13 (permalink)
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(in regards to OT)

to be honest - didn´t listen to commentary, but imho I spot few design flaws:
- retractable lift-only front fans: Too much dead weight, too much space lost
- multiple slots at front canard? too much drag, less lift
- I am no aerodynamicist, but the design overall seems more to please an investors eye than to maximize lift from every bit of surface.
- from my short experience Dysons bladeless ventilators produce impressive volume of moving air, but at an expense of greater wattage than conventional fans. You need to beat internal friction of massive volume of air pushed through relatively narrow tube.

I hope I am wrong, but it seems like Paul Moller offspring to me. With todays overpowered modell airplane motors its easy to fly any EPS structure, and too easy to produce appealing animation. Investor trap.
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Old 02-24-2021, 10:51 PM   #14 (permalink)
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Old 02-25-2021, 12:39 AM   #15 (permalink)
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Wrong thread?

Quote:
Originally Posted by seifrob
- retractable lift-only front fans: Too much dead weight, too much space lost
- multiple slots at front canard? too much drag, less lift
- I am no aerodynamicist, but the design overall seems more to please an investors eye than to maximize lift from every bit of surface.
  • I don't understand why they retract. If not, they may augment that slotted wing.
  • I commented on the front wing at #3, but it was neutral just to draw attention to it.
  • The flying scale model has a reasonable round-ended rectangle duct, the investor friendly rendering has an odd kink in the bottom.

But they do have a flying scale model. Maybe they know what their doing? Productizing it is an whole another matter.
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Old 02-25-2021, 04:19 AM   #16 (permalink)
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Wrong thread?
-samwichse probably wants to draw attention to ejectors used at the back of that Tatra 603. While I do not object that ejectors can produce massive amount of moving air, I have conserns about total momentum (and thus generated thrust). Will look into it for sure. Good point!

Quote:
Originally Posted by freebeard View Post
  • I don't understand why they retract. If not, they may augment that slotted wing.
  • I commented on the front wing at #3, but it was neutral just to draw attention to it.
  • The flying scale model has a reasonable round-ended rectangle duct, the investor friendly rendering has an odd kink in the bottom.

But they do have a flying scale model. Maybe they know what their doing? Productizing it is an whole another matter.
- i haven´t noteced this. kinda hard to read comments carefully at 2 o clock in the morning.

I too wish it became a true, But Mollers Skycar, Aptera, Elio, Nikola Motors....

Both Coanda and Bernoulli were tested for transportation (either rotary wings, or rotary sails, or to improve STOL performace) and usually utilized only in special (military) applications, where efficiency is not the main concern.

I Will watch their progress though. You found interesting project.
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Old 02-25-2021, 09:38 AM   #17 (permalink)
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Quote:
Originally Posted by seifrob View Post
(in regards to OT)

......................Investor trap.
I agree.

It's pretty easy to get just about any that flies to fly at model scale (or animation) because of the power to weight ratios. One must weigh down and penalize the model for a scaling factor so that it's an accurate representation of the larger scale.

That said, it is NOT certain to failure.

I say this in order to keep an open mind, and based on this large RC hovercraft model that uses electric fan jets and actually carries it's inventor over hard surfaces (water not so much - not enough surface area).

DIY 12000W Electric Personal Hovercraft Running Test


There is another video of his showing a power up inside of his spare bedroom, worth watching.

If the aircar in the opening post works, it's not so much because of airslots, it would be because of the advancements in electric batteries and fans changing the game. Maybe the game is changed so much that less efficient solutions using air slots will work.
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Old 02-25-2021, 09:39 AM   #18 (permalink)
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Quote:
Originally Posted by seifrob View Post
-samwichse probably wants to draw attention to ejectors used at the back of that Tatra 603. While I do not object that ejectors can produce massive amount of moving air, I have conserns about total momentum (and thus generated thrust). Will look into it for sure. Good point!
Got it in one :-).
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Old 02-25-2021, 03:01 PM   #19 (permalink)
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Quote:
but the design overall seems more to please an investors eye
Ding! Ding! Ding! Ding! Ding! We have a winner!

My first big question is if it's not a twin engine design, what's the engine out glide ratio on this thing?
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Old 02-25-2021, 05:06 PM   #20 (permalink)
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Another pic, this one down the ejector cooling, just because I like it


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