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Old 07-22-2020, 10:31 AM   #3501 (permalink)
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?

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Originally Posted by freebeard View Post
Did you mean Drag-Kapult?



I wanted to give it a satin green finish and a logo, but I'm still learning Krita v3.3.3. I did figure out the clone brush.
I was going for 'kaput!', as in 'drag breaker'.

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Old 07-22-2020, 10:58 AM   #3502 (permalink)
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Tracker/ Cirrus

* the tail boom length probably necessitated the extra ground clearance for departure angle, which doesn't help drag. Can't see the belly. Presume that it's panned.
* the mirrors are really dirty.
* trailing parts of front fenders would be in separated flow.
* faux wing root, rear fenders would really add frontal area, plus high drag.
* wheels are dirty and increasingly exposed to air, compared to Tracker.
* turbulence from mirrors and fenders would compromise the boat-tailing of the aft-body.
* I can't imagine driving it in any wind at all. The C.G./ C.P. looks way too spooky.
* Tracker was assigned Cd 0.45. I don't know that it's been improved upon. ' Doubt it.
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Old 07-27-2020, 03:57 PM   #3503 (permalink)
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Tatra T87 on Jay Leno's Garage:



There is neat footage of the underside of the T87 - I have never seen that anywhere else!
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Old 07-27-2020, 04:28 PM   #3504 (permalink)
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Most hadn't except for ditches around Austria in the 1940s.
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Old 07-28-2020, 11:37 AM   #3505 (permalink)
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Underbody aero is from 20:06-21:41 in the video.

I wonder how you change the oil in that system with the oil cooler run all the way up front. There's got to be a lot of oil in those lines and in the cooler. And if you got it all drained out, you wouldn't want to start it to pump that system all full again before you get lubrication?
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Old 07-28-2020, 03:35 PM   #3506 (permalink)
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In a video about the Chaparral 2J, they point out that it would do 40mph with the jets from the two powered fans alone. Donut Media: How Vacuums Made This Car Fast

What made it competitive was a complicated linkage system that decoupled the skirt from the body roll.

I was involved in the 1990s with an RC race car team. We had a car that would passively suck dirt 3" (the height of the wake) out of the pavement and leave a trail hanging in the air just like the 2J.
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Old 07-29-2020, 11:09 AM   #3507 (permalink)
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drain

Quote:
Originally Posted by samwichse View Post
Underbody aero is from 20:06-21:41 in the video.

I wonder how you change the oil in that system with the oil cooler run all the way up front. There's got to be a lot of oil in those lines and in the cooler. And if you got it all drained out, you wouldn't want to start it to pump that system all full again before you get lubrication?
I suspect that fresh oil was introduced while the engine was running, and oil pump was evacuating out the old oil.
A friend's mother's Toyota Corola's radiator breached internally, allowing coolant to contaminate the automatic transmission fluid, via the built-in cooler.
After $ 220 for a new radiator, I intercepted the transmission coolant lines, such that I could add in new fluid, while the torque converter pumped out what looked like strawberry milkshake, until the fluid finally ran clear.
Motor oil will cling to engine parts for years, maintaining hydrodynamic lubrication, even in a 'dry' engine, which hasn't turned over for the duration. It's impressive!
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Old 08-07-2020, 01:05 AM   #3508 (permalink)
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Every part of this has been thought about. It has air-cooled tail lights. The louvers for the cooling air are shaped like parabolic NACA ducts.

That fan*:
  • adds downforce
  • creates a 'virtual longtail'
  • adds thrust
The downforce comes because the fan pulls airflow up into the tall diverters, and acts forward of the rear axle line. As compared to airfoils at the front and back that have to be balanced.

The shape is virtually identical to the F1. The two-tone disguises it somewhat. It's the same size on the outside but bigger inside.

*Now I want to see a boxer four rear engine with a Porsche fan that blows, instead of sucking, right out the back like the T50. The difference would be it would be on all the time.
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Old 08-07-2020, 09:27 AM   #3509 (permalink)
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Quote:
*Now I want to see a boxer four rear engine with a Porsche fan that blows, instead of sucking, right out the back like the T50. The difference would be it would be on all the time.
Building that is now officially your homework. (Don't you have a stockpile of Beetles?)
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Old 08-07-2020, 09:26 PM   #3510 (permalink)
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I'm down to two.

The Superbeetle stays stock for the resale value.

The '58 Baja is slated to be a bobber rat rod. I'd have to add a boat tail.

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