Welcome Guest [Log In] [Register]

Announcements (Updated: July 11, 2018)

Welcome to Swifty's Garage!


Thanks to all of you for making this board what it is today!


Attention new members: We would like to welcome you personally, so please introduce yourself. Click here: INTRODUCTIONS


For all the latest news and announcements, please click here: PA System



Thank you - The Swifty's Garage Team




This board is best viewed at 1024 x 768 Resolution

Car of the Week:


Matchbox 1968 Ford F-100


Click Here: Matchbox '68 Ford F-100
Welcome to Swifty's Garage. We hope you enjoy your visit.


You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free.

Thank You,
The Swifty's Garage Team


Join our community!


If you're already a member please log in to your account to access all of our features.

Username:   Password:
Add Reply
  • Pages:
  • 1
  • 2
What do these terms mean?; JDM & DLM
Topic Started: Sep 17 2016, 12:40 PM (1,104 Views)
funeralxempire
SUV
Milton Fox Racing
 
I tend to agree with the wings and spoilers - as adding downforce - that they should be ground effects as well, but a wing has been excluded for a long time in the racing world - in the accepted ground effects definition. Not so sure about spoilers though. And the engineers and drivers in both NASCAR and F1 would probably argue that fender shapes (orlack of shape in NASCAR) do greatey effect down force as well as side force. Drivers will often drive up beside each other to change those forces during race events.

But back to the OPs question about JDM - remember it also includes graphics and neon lights that get added to a car to make it look like it can go faster!


Rice =/= JDM

Among things, that look was popular in America before most American 'import tuner scene' folks had heard the term JDM.

The shape of flares, your hood, your roof, etc can add downforce, but those, and the wing or spoiler on your car don't operate 'in ground effect' typically. A low mounted wing that works in tandem with your diffuser might, but those aren't too common outside of sports prototypes, most tintops seem to get rear wings that are mounted too high for that to be the case. Mounting it high makes sense to remove it from 'dirty' air flow, but if the car allows it to be mounted low enough to work with the diffuser it makes sense to mount it there, you give up a little bit of downforce (but less than one might expect if you're thinking of the wing in isolation) but you reduce drag significantly at the same time.

Never heard of a Flarecraft, but I am familiar with ekranoplans like the Caspian Sea Monster.
Offline Profile Quote Post Goto Top
 
juantoo3
Member Avatar
~~~~~~~~~~~~~~

funeralxempire
Sep 21 2016, 02:11 PM

Never heard of a Flarecraft, but I am familiar with ekranoplans like the Caspian Sea Monster.
It appears to me they are in the same category, the primary difference being size and use. I had not heard of Ekranoplans...took me right to the same Wiki reference. Large, military transports using ground effects principles primarily over water. Flarecraft are smaller, civilian pleasure craft using ground effects principles primarily over water.

Interesting to see the Ruskies were playing with these craft in the 70s, and they went largely unreported in the west at that time. Which coincides with when I learned of the development of Flarecraft in the states, which was touted at the time as the next big leisure activity...not quite boating and not quite flying while combining elements of both. It didn't catch on, and folks flocked to the new personal water craft (jet skis and jet bikes) instead.

Posted Image

From the Wiki:

Quote:
 
The craft was dubbed the "Caspian Sea Monster" by U.S. intelligence experts, after a huge, unknown craft was spotted on satellite reconnaissance photos of the Caspian Sea area in the 1960s. With its short wings, it looked airplane-like in planform, but would obviously be incapable of flight.[5] Although it was designed to travel a maximum of 3 m (9.8 ft) above the sea, it was found to be most efficient at 20 m (66 ft), reaching a top speed of 300 kn (560 km/h; 350 mph) to 400 kn (740 km/h; 460 mph) in research flights.


https://en.wikipedia.org/wiki/Ground_effect_vehicle

I quote this here regarding the Caspian Sea Monster to further make my point: "it was designed to travel a maximum of 3 m (9.8 ft) above the sea," which is that layer of atmospheric interaction with the surface that provides the "cushion" that provides "ground effects." I'm hard pressed to think of *any* non-airplane racing vehicles that operate normally at greater than 3 meters above the ground. Perhaps some dirt bikes in a motorcross, perhaps some offroad vehicles in an endurance race spend *some* time at that altitude, but most racers typically inhabit that boundary layer as a matter of course. Hence my opinion. In the grand scheme, it is merely words and doesn't really matter.
Offline Profile Quote Post Goto Top
 
funeralxempire
SUV
juantoo3
Sep 21 2016, 03:34 PM
funeralxempire
Sep 21 2016, 02:11 PM

Never heard of a Flarecraft, but I am familiar with ekranoplans like the Caspian Sea Monster.
It appears to me they are in the same category, the primary difference being size and use. I had not heard of Ekranoplans...took me right to the same Wiki reference. Large, military transports using ground effects principles primarily over water. Flarecraft are smaller, civilian pleasure craft using ground effects principles primarily over water.

Interesting to see the Ruskies were playing with these craft in the 70s, and they went largely unreported in the west at that time. Which coincides with when I learned of the development of Flarecraft in the states, which was touted at the time as the next big leisure activity...not quite boating and not quite flying while combining elements of both. It didn't catch on, and folks flocked to the new personal water craft (jet skis and jet bikes) instead.

Posted Image

From the Wiki:

Quote:
 
The craft was dubbed the "Caspian Sea Monster" by U.S. intelligence experts, after a huge, unknown craft was spotted on satellite reconnaissance photos of the Caspian Sea area in the 1960s. With its short wings, it looked airplane-like in planform, but would obviously be incapable of flight.[5] Although it was designed to travel a maximum of 3 m (9.8 ft) above the sea, it was found to be most efficient at 20 m (66 ft), reaching a top speed of 300 kn (560 km/h; 350 mph) to 400 kn (740 km/h; 460 mph) in research flights.


https://en.wikipedia.org/wiki/Ground_effect_vehicle

I quote this here regarding the Caspian Sea Monster to further make my point: "it was designed to travel a maximum of 3 m (9.8 ft) above the sea," which is that layer of atmospheric interaction with the surface that provides the "cushion" that provides "ground effects." I'm hard pressed to think of *any* non-airplane racing vehicles that operate normally at greater than 3 meters above the ground. Perhaps some dirt bikes in a motorcross, perhaps some offroad vehicles in an endurance race spend *some* time at that altitude, but most racers typically inhabit that boundary layer as a matter of course. Hence my opinion. In the grand scheme, it is merely words and doesn't really matter.
Ground effect isn't determined by height from the ground, it's determined by height from the ground relative to the wing's chord. An ekranoplan with stubby, deep wings might still be in ground effect much higher off the ground than a craft with a narrower wing chord. That's why a race car wing isn't operating in ground effect even if it's less than half the distance from the ground compared to a wing-in-ground-effect craft.

That flarecraft looks pretty fun.
Offline Profile Quote Post Goto Top
 
avalanche man
Member Avatar
avalanches rule
so since the 99 civic type r was only sold in japan, does that make it jdm?
Offline Profile Quote Post Goto Top
 
Hobie-wan
Member Avatar
SUV
Yes. But even a regular pedestrian 99 Civic that was made to be sold in Japan is JDM. It really just means (made to be sold in the) Japanese Domestic Market.

If Eddie Bauer (or whatever cobranded vehicles) Explorers were only made for the US because that's a recognizable name here, then someone in Europe that imported one might be driving around talking about their USDM vehicle.
Offline Profile Quote Post Goto Top
 
funeralxempire
SUV
Hobie-wan
Oct 5 2016, 10:49 AM
If Eddie Bauer (or whatever cobranded vehicles) Explorers were only made for the US because that's a recognizable name here, then someone in Europe that imported one might be driving around talking about their USDM vehicle.
Expanding from this, your (hypothetical) Acura DC2 with the bug-eyed front is USDM, and if that person trades front sheet metal with a Japanese Honda DC2 owner, the Japanese Honda DC2 owner did a 'USDM conversion' the American Acura owner did a 'JDM conversion'.

Further, nation of origin isn't relevant, GM has sold JDM Camaros (among vehicles), Volkswagen has sold JDM Golfs and Polos.
Offline Profile Quote Post Goto Top
 
diecastguru
Member Avatar
Compact
Here in Eastern PA, the term JDM is affiliated with the company James D. Morrissey, Inc. They have been in business for almost 100 years and they are the largest union Heavy Highway Builder in the region. They pretty much built every major road, and highway in Eastern PA. They also have a ready mix concrete division called JDM Materials, Co.

http://jdm-inc.com/

https://www.instagram.com/jdmmaterialscompany/
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Free Parking: Off Topic · Next Topic »
Add Reply
  • Pages:
  • 1
  • 2



March's Picture of The Month Contest



Congratulations DinoMom for winning March's contest!



April's Picture of The Month Contest



Congratulations carsdownunder for winning April's contest!






Powered By

This board is best viewed at 1024 x 768 Resolution


eXTReMe Tracker