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Search took 0.03 seconds. Search: Posts Made By: Otto
Forum: Aerodynamics 01-04-2024, 09:29 PM
Replies: 8
Views: 298
Posted By Otto
Best Coroplast thickness for a small car undertray?

What's the consensus view?
Forum: Aerodynamics 09-19-2022, 09:31 AM
Replies: 10
Views: 925
Posted By Otto
Nose design, air curtains, undertrays, etc.

Starting with a clean sheet of paper and aware of recent studies of car noses with air curtains, undertrays, etc., what would an optimized car nose look like?

In other words, how best to design a...
Forum: Aerodynamics 08-28-2022, 06:15 PM
Replies: 12
Views: 1,155
Posted By Otto
Speaking of which, I'm considering mods on my...

Speaking of which, I'm considering mods on my Porsche 944 Turbo, which left the factory in the mid-'80s with a drag coefficient of 0.29. With an undertray, aero mirrors, aero cleanup of the nose...
Forum: Aerodynamics 02-25-2021, 04:25 PM
Replies: 20
Views: 1,847
Posted By Otto
What woud be the ,optimum car nose shape given what is known about air curtains, undertrays, etc?e

Starting with a clean piece of paper and given what is known about air curtains, undertrays, nose stagnation and compression of airflow, etc., and given conventional car shape, what would such a face...
Forum: Aerodynamics 09-20-2018, 12:37 PM
Replies: 13
Views: 3,075
Posted By Otto
Seems to me, such vortex traps could be easily...

Seems to me, such vortex traps could be easily and inexpensively made with Coroplast, cut with a compass device to match the round curvature of the tire, then mounted to the inner fender liner.
...
Forum: Aerodynamics 10-20-2015, 04:06 PM
Replies: 9
Views: 4,762
Posted By Otto
Looking at the videos, I cannot see any...

Looking at the videos, I cannot see any significant difference in flow.

The outlet picture of the wheel well appears to show an adjustable gap, and if so, this could easily be adapted for use in...
Forum: Aerodynamics 10-20-2015, 12:32 AM
Replies: 9
Views: 4,762
Posted By Otto
Although the air curtain may help, I'm virtually...

Although the air curtain may help, I'm virtually certain there will be no laminar flow over the wheel and tire, despite the dubious claim by Ford.
Forum: Aerodynamics 09-26-2015, 11:13 AM
Replies: 6
Views: 1,968
Posted By Otto
Well, I ask because 4mm is the standard thickness...

Well, I ask because 4mm is the standard thickness for Coroplast at local sign shops, but that seems too thin to be stiff enough for an undertray supported by the car's cross members spaced ~2 feet...
Forum: Aerodynamics 09-19-2015, 11:12 PM
Replies: 11
Views: 3,307
Posted By Otto
The carbon fiber, fiberglass, or bedsheet with...

The carbon fiber, fiberglass, or bedsheet with resin ideas will all work, but require a smooth flat table to lay up on to get a smooth, flat surface. They'll also require stiffeners.

And, they'll...
Forum: Aerodynamics 07-08-2015, 02:14 AM
Replies: 9
Views: 1,989
Posted By Otto
Google for Lockheed YO-3 aircraft, essentially a...

Google for Lockheed YO-3 aircraft, essentially a Sweitzer sailplane with 5 or 6 bladed slow moving propeller, engine, and a long muffler. It was a dog to fly, being under powered and over weight,...
Forum: Aerodynamics 04-29-2015, 01:37 PM
Replies: 9
Views: 2,336
Posted By Otto
Aptly, this video describes this as like driving...

Aptly, this video describes this as like driving a taildragger plane down the road. That's because rear steering is inherently unstable. Makes for a small turning radius, though.

Put the...
Forum: Aerodynamics 03-30-2015, 04:15 PM
Replies: 59
Views: 8,016
Posted By Otto
And you managed this without megabucks from the...

And you managed this without megabucks from the feds. You've done a very good thing.

I suggest parking your truck at the front door of DOT with a big sign displaying its actual fuel economy...
Forum: Aerodynamics 03-10-2015, 03:02 AM
Replies: 8
Views: 1,547
Posted By Otto
The Corvette wheel arch mod is in effect an...

The Corvette wheel arch mod is in effect an admission the original geometry was lacking. Better to re-loft the fender lines to smoothly fair the airflow out to the vertical plane of the modified...
Forum: Aerodynamics 03-02-2015, 09:33 PM
Replies: 8
Views: 1,547
Posted By Otto
Apply to leading edges of front wheel wells, see...

Apply to leading edges of front wheel wells, see what happens.

I'd guesstimate that it would offset the major turbulence generated by the forward-rotating tires, which act as turbines and throw...
Forum: Aerodynamics 02-05-2015, 01:42 PM
Replies: 9
Views: 1,928
Posted By Otto
Make kerf cuts in the wood piece to help it...

Make kerf cuts in the wood piece to help it conform to the body contour. Or, make a female mold of the wood piece, and then make flexible foam duplicates of the wood piece's shape by using Gorilla...
Forum: Aerodynamics 07-21-2014, 11:27 AM
Replies: 45
Views: 9,443
Posted By Otto
Not if the polyester resin does not contact the...

Not if the polyester resin does not contact the polystyrene. There are barrier or prophylactic methods to protect polystyrene, so google for foam sculpting websites for hobbyists and artists. ...
Forum: Aerodynamics 07-07-2014, 02:41 AM
Replies: 45
Views: 9,443
Posted By Otto
Styrene foams such as styrofoam can be hotwired,...

Styrene foams such as styrofoam can be hotwired, with excellent results, as is common for wings, etc in homebuilt airplanes. But, polyester resin dissolves that foam, so you must use more expensive...
Forum: Aerodynamics 07-05-2014, 12:30 PM
Replies: 45
Views: 9,443
Posted By Otto
Polyurethane foam such as Great Stuff is...

Polyurethane foam such as Great Stuff is closed-cell, and adheres very well, so is used for flotation in boats. Gorilla Glue is also polyurethane, so makes a good adhesive for PU foam board. ...
Forum: Motorcycles / Scooters 03-19-2014, 02:24 AM
Replies: 180
Views: 38,286
Posted By Otto
Try clear plastic L shaped corner piece used to...

Try clear plastic L shaped corner piece used to protect corners of sheetrock walls in houses. Comes in 8' lengths, straight but somewhat flexible.

Very cheap at Home Depot or Lowes. Stick on...
Forum: Aerodynamics 12-15-2013, 01:07 PM
Replies: 24
Views: 6,549
Posted By Otto
Diffuser design, per Lotus blog

http://www.lotustalk.com/forums/attachments/f92/86902d1217307347-can-someone-explain-what-diffuser-does-lotus-aero-005-copy.jpg
and ...
Forum: Aerodynamics 12-06-2013, 03:22 PM
Replies: 52
Views: 13,805
Posted By Otto
This is exactly why I asked in another thread...

This is exactly why I asked in another thread about optimum nose shape.

Mother Nature tells us with her snowscapes that nose shapes count. It would be wonderful if somebody could extract...
Forum: Aerodynamics 11-28-2013, 02:11 PM
Replies: 106
Views: 86,120
Posted By Otto
Lowering the rear end is probably the worst thing...

Lowering the rear end is probably the worst thing you could do: It just makes the underbody a trap for air, acting essentially like a boogie board that kids use to skim along the shallow water at...
Forum: Aerodynamics 11-28-2013, 01:53 PM
Replies: 79
Views: 39,715
Posted By Otto
Parachute effect: If the rear bumper cover is...

Parachute effect: If the rear bumper cover is effectively a parachute, drilling holes in it might make it less a parachute, reducing drag somewhat and thereby attenuating a gross design flaw. ...
Forum: Aerodynamics 11-28-2013, 01:36 PM
Replies: 4,211
Views: 1,319,558
Posted By Otto
The extra lumps and bumps, coupled with the Coke...

The extra lumps and bumps, coupled with the Coke bottle wasp waist, probably detract from aerodynamic efficiency, needlessly reducing the cabin volume and side-impact crush zone into the bargain. ...
Forum: Aerodynamics 11-19-2013, 02:06 PM
Replies: 54
Views: 13,918
Posted By Otto
One reason for reduced drag is the location of...

One reason for reduced drag is the location of the foglights: Consider one of those color-coded pressure graphics showing air pressure along a car body, where red is the highest pressure, and blue...
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