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Search took 0.09 seconds. Search: Posts Made By: some_other_dave
Forum: EcoModding Central 09-09-2022, 12:00 AM
Replies: 8
Views: 663
Posted By some_other_dave
IIRC, the R and L series engines rotate the...

IIRC, the R and L series engines rotate the opposite way from the D series--and have the transmission on the opposite side of the engine bay! That means the mechanical part of the swap is more...
Forum: Aerodynamics 08-29-2022, 02:30 AM
Replies: 12
Views: 1,155
Posted By some_other_dave
That was not done for aerodynamic purposes. That...

That was not done for aerodynamic purposes. That was done because the wheels had to be covered by the fenders, and they wanted to put wider wheels and tires on the car. So they could take corners...
Forum: EcoModding Central 08-22-2022, 03:02 AM
Replies: 73
Views: 6,202
Posted By some_other_dave
You've said that a couple of times. Can you...

You've said that a couple of times. Can you provide a source?

Traditional torque-converter automatic gearboxes are quite complex, what with planetary gearsets and immensely fussy shift valve...
Forum: The Unicorn Corral 08-22-2022, 02:20 AM
Replies: 40
Views: 6,740
Posted By some_other_dave
This sounds like EGR with extra steps. ...

This sounds like EGR with extra steps.




You forgot about the entirely mundane possibility that there was some flat surface now that had air passing across it, causing it to vibrate. Like a...
Forum: Hypermiling / EcoDriver's Ed 04-12-2022, 11:35 PM
Replies: 16
Views: 5,651
Posted By some_other_dave
Remember that "efficiency" can mean many...

Remember that "efficiency" can mean many different things!

The BSFC graphs show the most efficient way for your engine to make power, not specifically the most efficient way to get from point A to...
Forum: Aerodynamics 12-06-2021, 09:15 PM
Replies: 88
Views: 8,033
Posted By some_other_dave
Where did you hear that? The lines cross at the...

Where did you hear that? The lines cross at the same RPM, always! (Exactly what RPM depends on what units you use for power.)

In SAE units, HP is defined as (Torque * RPM / 5250). So those...
Forum: Off-Topic Tech 11-07-2021, 05:20 PM
Replies: 9
Views: 886
Posted By some_other_dave
Depends on a number of things. How is the air...

Depends on a number of things. How is the air flow being measured? There are three different ways this typically happens (or four if you add carburetors to the discussion).

One is "just guess...
Forum: General Efficiency Discussion 10-31-2021, 09:30 PM
Replies: 12
Views: 1,352
Posted By some_other_dave
The idea of a whole bunch of computer-controlled...

The idea of a whole bunch of computer-controlled vehicles traveling very closely to cut down on aero drag is not new. It was one of the points that was touted by proponents of autonomous vehicles at...
Forum: General Efficiency Discussion 08-31-2021, 02:53 PM
Replies: 22
Views: 3,137
Posted By some_other_dave
I don't think you can really say that engine size...

I don't think you can really say that engine size is irrelevant. I mean, if we want to pick absurd examples, how about a diesel ship's engine? It's only a few hundred tons, after all...

Smaller...
Forum: General Efficiency Discussion 07-31-2021, 02:32 AM
Replies: 44
Views: 3,494
Posted By some_other_dave
I vividly remember one car commercial: A guy is...

I vividly remember one car commercial: A guy is in the gym, and an announcement is made over the speakers: "There's a tan minivan with its lights on." He looks around, obviously hoping nobody sees...
Forum: EcoModding Central 07-27-2021, 11:36 PM
Replies: 73
Views: 5,452
Posted By some_other_dave
There are a lot more D-Jetronic parts being made...

There are a lot more D-Jetronic parts being made nowadays for people restoring late-60s through mid-70s cars. Manifold Pressure sensors can be rebuilt with kits from places like Tangerine Racing.
...
Forum: Aerodynamics 07-27-2021, 11:28 PM
Replies: 4,211
Views: 1,319,413
Posted By some_other_dave
You could share the link to the single post. Or...

You could share the link to the single post. Or at least the link to the right page.

https://forums.pelicanparts.com/off-topic-discussions/1065287-2020-new-random-pics-112.html#post11354379
...
Forum: EcoModding Central 07-19-2021, 02:51 PM
Replies: 29
Views: 13,402
Posted By some_other_dave
You might check on www.archive.org , if you know...

You might check on www.archive.org , if you know the old URL.

-soD
Forum: Aerodynamics 06-30-2021, 08:41 PM
Replies: 43
Views: 3,633
Posted By some_other_dave
The other problem with airships is that they are...

The other problem with airships is that they are far too affected by the weather. The US lost a number of airships between the two world wars to weather events. (Three major ones that I can think...
Forum: Aerodynamics 06-30-2021, 08:30 PM
Replies: 138
Views: 11,331
Posted By some_other_dave
Here's the part with the wheeled device that...

Here's the part with the wheeled device that RedDevil proposed. It does exactly what he says.

EDIT: shoot, the forum doesn't seem to want to post time-stamped links correctly.

Anyway, it's at...
Forum: Aerodynamics 06-30-2021, 08:23 PM
Replies: 1,306
Views: 163,161
Posted By some_other_dave
Probably because it's hot AF with the canopy...

Probably because it's hot AF with the canopy closed...

-soD
Forum: Aerodynamics 06-30-2021, 02:37 AM
Replies: 138
Views: 11,331
Posted By some_other_dave
Just saw a new video discussing the Blackbird...

Just saw a new video discussing the Blackbird from an engineering perspective. Perhaps it can help convince the naysayers?

https://www.youtube.com/watch?v=CkhBskovitQ


-soD
Forum: Aerodynamics 06-24-2021, 07:20 PM
Replies: 138
Views: 11,331
Posted By some_other_dave
No, it is not. You are starting from this...

No, it is not. You are starting from this assumption, and so you go wrong from the beginning.

It is not a square-rigger, it is much more like a modern sailboat with triangular sails. Which can...
Forum: Aerodynamics 06-19-2021, 01:44 AM
Replies: 138
Views: 11,331
Posted By some_other_dave
But we're not talking about sailing with the...

But we're not talking about sailing with the wind. And the propeller blades are not turning with the wind--when they turn, they are meeting it at an angle!

-soD
Forum: Aerodynamics 06-16-2021, 07:11 PM
Replies: 138
Views: 11,331
Posted By some_other_dave
If I may take another tack here-- (see what I...

If I may take another tack here-- (see what I did there?)

Do you believe that a boat can sail faster than the wind speed? Your arguments would seem to say that no, they cannot.

If not, then...
Forum: Aerodynamics 06-13-2021, 01:00 AM
Replies: 138
Views: 11,331
Posted By some_other_dave
It used to blow my mind that a sailboat could...

It used to blow my mind that a sailboat could sail faster than the actual wind. Then I started wrapping my head around the fact that the sail in question was acting as an airfoil.

Once I realized...
Forum: Aerodynamics 03-28-2021, 12:42 AM
Replies: 940
Views: 326,304
Posted By some_other_dave
No, the radiators have always been up front in...

No, the radiators have always been up front in the watercooled 911s and Boxsters/Caymans.

It is most likely that what you see there are intercoolers. I think all of the 911 line are turbocharged...
Forum: Aerodynamics 03-01-2021, 02:34 AM
Replies: 20
Views: 1,846
Posted By some_other_dave
There is no one "ideal". If there were, it would...

There is no one "ideal". If there were, it would be universally used by now.

There are a ton of different constraints that an automotive shape has to satisfy. And each choice made in one affects...
Forum: Aerodynamics 01-21-2021, 08:02 PM
Replies: 12
Views: 1,561
Posted By some_other_dave
Looks like double wishbones up front and...

Looks like double wishbones up front and semi-trailing arms in back? That's about a million times better than the original Speedster's suspension, which Porsche 356 guru and racer Vic Skirmants once...
Forum: Aerodynamics 01-20-2021, 02:26 PM
Replies: 233
Views: 19,505
Posted By some_other_dave
Any way you cut it, 100 MPG at 60 MPH...

Any way you cut it, 100 MPG at 60 MPH steady-state is gonna be a tall order!

Vintage looks will make it even tougher, since almost all vintage cars have poor cD and even the ones with a decent cD...
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