Low cost car aerodynamic testing

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Low cost car aerodynamic testing

Рет қаралды 3,627

Julian Edgar

Күн бұрын

Пікірлер: 41

@piedpiper1172 2 ай бұрын

Dear fellow enthusiasts: his book is cheaper than that dubious carbon fibre lip a company you’ve never heard of sells for your car. It’ll last longer too. Just get it, I know, you’re all “is this just an add, can it be that good, can’t I figure it out from the videos?” Get the book.

@JulianEdgar 2 ай бұрын

Thank you!

@prophecyking3448 Ай бұрын

I don't know boss, attaching a book to a front bumper doesn't seem like a good idea

@tcarter6462 2 ай бұрын

I was ready to buy about $1000 worth of chassis braces then you appeared on my feed and stopped me before costly needles mods that at best would have only marginally increased the speed at which the same handling characteristics would have happened with less margin for error and correction. Thank you.

@JulianEdgar 2 ай бұрын

You can still buy them, it's just that it is almost certain that money is better spent elsewhere.

@tcarter6462 2 ай бұрын

@JulianEdgar my first book will be your aero book. My car is fairly well balanced by itself, but tends to power understeer. Lift off brake oversteer and has a considerable amount of lift at higher speeds.

@michaelblacktree 2 ай бұрын

I've done some tuft testing with a cheap action camera and some yarn. I made a camera rig from PVC pipe, to film the tufts while I drive. Less than $100 US altogether, and you get video footage to watch and analyze all you want.

@buicksmith1249 2 ай бұрын

First off. Thank you for this video. It helped me a lot. I have plenty of Dirt and snowy roads. So will be doing that for sure. And will defiantly look at the Magnehelic setup for finding out how to get more air out of the engine bay on my 1971 Buick GS.

@SeanOBryanZZ 2 ай бұрын

What's up! Nice too see you here. I deffinetly like the way Julian explains, and provides testable expiraments.

@buicksmith1249 2 ай бұрын

Loving the book by the way.:)

@nateracing 2 ай бұрын

8:00 What units are those in? I'd imagine kPa over Pa given how small Pascals are, but I suppose it depends on the speed?

@JulianEdgar 2 ай бұрын

Pascals.

@ixD9 2 ай бұрын

Would checking throttle position (from the ECU) to maintain a given speed be a good way to track changes in drag? If holding 75 mph takes less throttle then there must be less drag, right?

@JulianEdgar 2 ай бұрын

Yes but I find maintaining a fixed throttle opening and measuring changes in speed works better. But needs to be done ultra carefully and with comparisons made in the same session.

@ixD9 2 ай бұрын

@@JulianEdgar Oh, huh. Interesting. Any theories on why that works better? Seems like maintaining specific throttle would be tougher than specific speed. If it's a streetable car, you could even have cruise control maintain speed extra steadily while logging throttle position over time. Just a shower thought on my part though. I yield to your experience.

@JulianEdgar 2 ай бұрын

I imagine because the inertia of the car is such that car speed at a fixed throttle opening gives a smoothed result, whereas to maintain a speed, the throttle is constantly being juggled - especially under cruise control.

@michaelblacktree 2 ай бұрын

Cruise control would be a bad choice, because it constantly adjusts throttle position. Your throttle position data would be all over the place. Any differences between one test and another would probably get lost in the noise. The fixed throttle position would be more workable, but would need a long section of straight level road with little traffic.

@ixD9 2 ай бұрын

@@JulianEdgar Ahhh that does make sense. Basically smoothing the value aerodynamically rather than mathematically like you'd have to with a throttle position plot. Thanks for the info!

@matsudakodo 2 ай бұрын

Hey Julian, enjoying your videos. Let's say you're done prototyping and testing some aero mods and want to build them out to look more finished. Would 3D printing be viable?

@JulianEdgar 2 ай бұрын

For smaller items, maybe.

@gerardvanwalstijn9077 2 ай бұрын

Hi Julian, it would be great with a link to the book, preferably as an e-book.

@JulianEdgar 2 ай бұрын

No e-book is available. Hard copy - www.amazon.com/Vehicle-Aerodynamics-Modification-Development-alternative/dp/B0C87VYVL8 or Amazon in your country

@gerardvanwalstijn9077 2 ай бұрын

@@JulianEdgar Please consider publishing as an e-book, I am probably not the only potential buyer that only buys e-books to avoid the unnecessary cleanup of my office/house with piles of paper :)

@andersonchong7625 Ай бұрын

And I don’t live in the US, oversea shipping fees would be very expensive

@qkurd9141 2 ай бұрын

Hey Sir! You have great archive here! Wish I could buy some of your books, yet they're impossible to buy from Iran directly! Even though I am United Nations employee, on and off for 8 years now! Yet, I hope we could benefit of'em very soon!

@JulianEdgar 2 ай бұрын

If there's a postage service, you can buy them direct from me. But it will be expensive for freight.

@crispychicken7933 2 ай бұрын

Sorry, maybe I missed it, but what’s the actual method for measuring drag? Engine load?

@JulianEdgar 2 ай бұрын

Constant load, varying speeds.

@crispychicken7933 2 ай бұрын

Ok, I guess as simple as a block under the throttle on the same road then! Thanks

@JulianEdgar 2 ай бұрын

Yeah, but with a few more subtleties in testing technique.

@10weslleynereu 2 ай бұрын

Hi Julian! I'm making a front grill to (hopefully) increase air flow on the radiator - would measuring the temperature rasing time difference be accurate enough measurement? (I'm planing on ducting the air all the way out behind the wheels but for right now the duct will end on the radiator). Nice information as aways btw!

@JulianEdgar 2 ай бұрын

No. Why measure a secondary effect when you can so easily measure the primary? It will be far faster and, I'd suggest, more accurate to measure pressures.

@10weslleynereu 2 ай бұрын

@@JulianEdgar Thanks! Im working on acquiring the necessary hardware for it

@johnkim3858 2 ай бұрын

Cyclist will get meltdowns at 14:07

@JulianEdgar 2 ай бұрын

Yes, people calculating Cd values to three decimal places from coast-downs is one of the absurdities of aero misinformation. (At least, not without a huge number of runs, some very sophisticated modelling of rolling inertias, and use of a yaw based anemometer probe.)