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Search: Posts Made By: TEiN
Forum: Aerodynamics 04-29-2020, 10:43 AM
Replies: 141
Views: 24,027
Posted By aerohead
sticking out

'Sticking out' is an advantage.The convexity of the disc returns a lower drag than a flat disc,even though it aggravates frontal area.The technology dates to the WW-I Curtiss JN-4 'Jenny',of which...
Forum: Aerodynamics 04-22-2020, 01:42 PM
Replies: 141
Views: 24,027
Posted By California98Civic
I want to offer this study into the mix....

I want to offer this study into the mix. Ventilation drag seems to be a closely-related issue.

Alexey Vdovin, "Investigation of Aerodynamic Resistance of Rotating Wheels on Passenger Cars,"...
Forum: Aerodynamics 02-16-2017, 08:52 AM
Replies: 71
Views: 16,474
Posted By kach22i
I appears that because of the small scale the...

I appears that because of the small scale the physical attachment of the spoilers introduces compromises.

Maybe the spoilers themselves are just way too large and thick to be of practical value?
...
Forum: Aerodynamics 02-11-2017, 02:41 PM
Replies: 71
Views: 16,474
Posted By aerohead
911s

here's the original 911/912
http://i1271.photobucket.com/albums/jj622/aerohead2/06-2814.jpg (http://s1271.photobucket.com/user/aerohead2/media/06-2814.jpg.html)
later,with whale-tail...
Forum: Aerodynamics 02-09-2017, 09:00 PM
Replies: 71
Views: 16,474
Posted By kach22i
The corrugated metal image was just one of many...

The corrugated metal image was just one of many examples or variants within the same conceptual family.

Testing flat sheets with waves, wavy sheets with waves, and more complex 3D shapes similar...
Forum: Aerodynamics 02-05-2017, 07:33 AM
Replies: 71
Views: 16,474
Posted By kach22i
I agree with what everyone else has been saying...

I agree with what everyone else has been saying about reducing Cd and lift if you can. I'm offering this example for reference because it is so iconic and well tested.

Sourced base image below...
Forum: Aerodynamics 02-04-2017, 03:45 PM
Replies: 71
Views: 16,474
Posted By aerohead
1/24-scale

Full-size automobiles achieve a stable coefficient of drag at around 20-mph.
Testing mods in full-scale would require at least a 20-mph test velocity....
Forum: Aerodynamics 02-04-2017, 01:22 PM
Replies: 71
Views: 16,474
Posted By ChazInMT
A wind tunnel is like using a chain saw to slice...

A wind tunnel is like using a chain saw to slice onions, you get an idea about what might be happening, but the slices will look dramatically different.

The 3 primary differences between a wind...
Forum: Hybrids 04-17-2016, 07:41 PM
Replies: 843
Views: 327,535
Posted By Bill the Engineer
Update: Sorry for the sideways photo... ...

Update:

Sorry for the sideways photo...

I spent the afternoon cutting away the pieces that I thought were holding the Firebird body too high on the chassis. Nothing seemed to work even though...
Forum: Hybrids 04-12-2016, 11:57 AM
Replies: 843
Views: 327,535
Posted By mcrews
I like the 55 tbird. there is a fiberglass kit...

I like the 55 tbird.
there is a fiberglass kit in 1to1 ratio on a frame with roller wheels. you can install rack and pinion steering and any engine and tranny.
Yet 'classic car guys' ***** and...
Forum: Hybrids 04-12-2016, 06:48 AM
Replies: 843
Views: 327,535
Posted By Bill the Engineer
Thanks for all the support folks. It is...

Thanks for all the support folks. It is appreciated. Making major modifications just so the rear wheels would do a burn-out instead of the front ones just doesn't make sense to me. Here is why.
...
Forum: Hybrids 04-11-2016, 05:36 PM
Replies: 843
Views: 327,535
Posted By RedDevil
I am fine with anyone who says this project is a...

I am fine with anyone who says this project is a bad idea, as long as they themselves bought one of the many thousands of Firebird wrecks rotting away and carefully restored them to perfect working...
Forum: Hybrids 03-05-2016, 04:28 PM
Replies: 843
Views: 327,535
Posted By Bill the Engineer
I think someone beat you to that last one... ...

I think someone beat you to that last one...

BangShift.com 1967 Firebird Convertible Body Onto A Prius Chassis...
Forum: Aerodynamics 12-21-2015, 10:06 PM
Replies: 32
Views: 6,355
Posted By freebeard
I'm in the Bucky Fuller camp:

I'm in the Bucky Fuller camp:
Forum: Hypermiling / EcoDriver's Ed 11-05-2015, 07:20 AM
Replies: 85
Views: 20,123
Posted By user removed
It's important to understand the difference...

It's important to understand the difference between load and throttle position. When accelerating a very small increase in throttle position can make a huge increase in load.

This happens when you...
Forum: Hypermiling / EcoDriver's Ed 11-05-2015, 05:53 AM
Replies: 85
Views: 20,123
Posted By Angib
It is amazing how many people think that pressing...

It is amazing how many people think that pressing the accelerator pedal less means higher fuel economy.

If you need energy, for example to reach your chosen cruising speed, then you should buy it...
Forum: Hypermiling / EcoDriver's Ed 11-04-2015, 10:55 PM
Replies: 85
Views: 20,123
Posted By mr bad example
i find this true in my smart, we call it "drive...

i find this true in my smart, we call it "drive it like you stole it". accelerating for 8-10 seconds at 1.8-2 GPH uses less fuel than accelerating 1.3-1.5 GPH for 15-20 seconds. (i use an ultra...
Forum: Hypermiling / EcoDriver's Ed 11-04-2015, 08:09 PM
Replies: 85
Views: 20,123
Posted By skyking
If the target speed is going to be optimal, say...

If the target speed is going to be optimal, say 45~50 MPH, the sooner you can start reaping the benefit of that speed the better, IMO. Diesel favor a more brisk acceleration for this reason. Poking...
Forum: Hypermiling / EcoDriver's Ed 10-17-2015, 07:59 PM
Replies: 85
Views: 20,123
Posted By JRMichler
I ran some tests with my truck. Starting from...

I ran some tests with my truck. Starting from work, pulling out onto the road, and accelerating to 35 MPH (the speed limit) at various rates and shifting at different RPM's. The Scangauge trip MPG...
Forum: Aerodynamics 03-28-2015, 09:46 AM
Replies: 4,208
Views: 1,314,058
Posted By kach22i
That is not a 1973, because it has accordion...

That is not a 1973, because it has accordion bumpers (1974 and plus feature). However it is more like a pre-1970 because it appears to have the shorter wheelbase. The early 1980's Tea-Tray or Whale...
Forum: Aerodynamics 02-02-2015, 02:39 PM
Replies: 67
Views: 18,888
Posted By redneck
. Here's another one he did with the solar...

.

Here's another one he did with the solar car in a wind tunnel.

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


>
Forum: Aerodynamics 03-27-2014, 12:37 PM
Replies: 84
Views: 28,770
Posted By doviatt
http://www.youtube.com/watch?v=ftq8jTQ8ANE

http://www.youtube.com/watch?v=ftq8jTQ8ANE
Forum: Aerodynamics 02-12-2013, 01:46 PM
Replies: 4,208
Views: 1,314,058
Posted By Varn
It is listed with the diablo but it is called the...

It is listed with the diablo but it is called the Varna2. An older version of the diablo that I modified to diablo specs. It has been to 62 mph as the original version ridden by Sam in the early 90s....
Forum: Hypermiling / EcoDriver's Ed 10-23-2012, 10:04 PM
Replies: 112
Views: 43,878
Posted By MetroMPG
Have you ever given 1-on-1 ecodriving instruction? (Here's how I did it.)

To a willing participant? (Grumbling from the back seat / passenger seat doesn't count! :D)

http://www.metrompg.com/posts/photos/hypermiling-tips.jpg[/img-r]I used to teach in-car defensive...
Forum: Hypermiling / EcoDriver's Ed 10-08-2012, 05:18 PM
Replies: 103
Views: 26,785
Posted By redneck
Well... If that ain't accurate enough for...

Well...

If that ain't accurate enough for you then how about...

One Mississippi.

Two Mississippi.

Three ........
Showing results 1 to 25 of 223

 
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