Does anyone have specs for the opel gt? - Page 2

2.3T_GT · 10-29-2003

i didn't think of using it to cool the brakes, and that would also be a good use for it. but like i said if you could channel it to the rear wouldn't it give an appreciable decrease in the pressure differance back there being created by the "abrupt" end of the car. i remeber somebody saying this is what causes a good portion of the drag and rear end lifting on our cars.

bear785 · 11-11-2003

when I was thinking of ideas for my opel when I convert it to elec. For longer trips I was going to fab up a tail cone to house a ic generator and remove the abrupt end all together

Cypher · 11-11-2003

Ok, I have a real problem with the "plating the underside" thing. In theory it is a great idea. In fact mercedes had the same idea. They did it with one of their cars, I believe the SLK Le Mans car. Anyway, they had 3 cars turn into "airplane wings" before the season was half way over. Some of you may recall seeing the video of this a few years back. Seems that under certain circuimstances the under cladding had the opposite effect. and for you who did not see the video. The mercedes started to slowly lift at the nose, and then abruptly flipped end over end. I believe the guy did 9 some odd flips in mid-air in under 3 seconds.

Not my idea of fun

Cypher · 11-11-2003

They also had the same problem with the Porsche GT1, but I think it may have been another cause

West Coast GT · 11-11-2003

Cypher - I've seen a video clip of a race car doing a back flip just like a speed boat does. I think it was yellow, halfway down a short straight. Sound like the same one you're referring to?

baz · 11-12-2003

the merc tha t fliped was on the Mulsane straight( about 3 kilometres long with 2 chicanes and a kink) and even with add on winglets to control the lift allthe merc got was 300 yards and 30 MPH faster before

namba209 · 11-12-2003

I've seen this more than my fair share of times, both in the full size racing boats and the model racing boats. Aerodynamics plays a huge part in boat racing. You just want the boats to skim across the water riding on a cushion of air. As soon as the nose get a little light, the air pressure pushes the nose straight up and instead of being a hydroplane, they become an aeroplane. The same thing applies to cars, with a totally flat bottom and the curves above the center line of the angle of attack, you have a lifting surface. The rule of thumb here is the faster you go, the more lift you get. Basic laws of physics apply and air brakes don't work in that scenario.

Ron

baz · 11-13-2003

this link is to an artical on the merc flip and the reasons for it http://www.mulsannescorner.com/techarticle1.htm

namba209 · 11-13-2003

Yeah Baz, that explains exactly what I referred to. I went so far as to query an unlimited racing boat mech why they couldn't put a gyro in the boat to automatically actuate the front spoilers and horizontail tail piece to dump the lift if the boats exceed a specific angle of attack. The response was the rules prohibit any "automatic" trimming of the boats, even to keep it from flipping over. and possibly injuring the drivers. Oh well, I'm just an old Air Force jet mech that doesn't know anything about aerodynamics, I guess. The last aircraft I was a crew chief on just happened to be the worlds fastest, highest flying, production aircraft made. It cruised at 2194 MPH at an altitude in excess of 80,000 feet. So that doesn't give me much credence.

Ron

baz · 11-13-2003

i didnt know the US Airforce had that many british kites
and i thought NeverAchieveSpaceAgain used to fly a brick that went faster than that?????

the thing to do must be to put the wheels on the roof and use the shape to get down force
this will mean we will all have to use the hyundi pony safty belt because it will be a pain to put the lap and sholder belts on 1 at a time

baz · 11-13-2003

just dont do it before you put the wheels on top first

hence my tag line
my head still hurts 12 weeks later

namba209 · 11-13-2003

I think if I was in that car may head would hurt for a while too. British Kites? NASA has the shuttle and the USAF had the Dyna Soar program along with the X series aircraft, but none were production type aircraft, and all of them, except for the shuttle and X-15 are slower than the SR-71. Wheels on top? I think I've seen a radio controlled car that had that configuration. I like the seat belt idea but it would still be a pain to get in and out of the car with it upside down.

Ron

jvandyke · 05-14-2007

Reading through some period reviews of the GT they mention (usually with approval) the use of the Kamm tail to reduce drag. I see in this thread the tail implicated as being draggy. Also wondering if the Steinmetz kit is good for this (I'd imagine that's why it's out there, reduce drag). Curious.

carter840 · 06-10-2007

I have always wondered what the acceleration of the GT is like. Could someone give me the 0-60 times on a 1.9L engine.
thanks

jordan · 06-10-2007

R&T tested the gt 1.9l
0-30mph @ 3.6 seconds
0-40mph @ 5.5 seconds
0-50mph @ 7.4 seconds
0-60mph @ 10.8 seconds
0-70mph @ 14.7 seconds
0-80mph @ 19.1 seconds
0-100mph @ 34.0 seconds

1/4mile time of 17.7 seconds @ 77mph

11-12-2003	#32 (permalink)
namba209 5,000 Post Club Join Date: Aug 2002 Location: Imperial Beach, CA South of San Diego Posts: 5,974 Classified Rating: 0% (0)	I've seen this more than my fair share of times, both in the full size racing boats and the model racing boats. Aerodynamics plays a huge part in boat racing. You just want the boats to skim across the water riding on a cushion of air. As soon as the nose get a little light, the air pressure pushes the nose straight up and instead of being a hydroplane, they become an aeroplane. The same thing applies to cars, with a totally flat bottom and the curves above the center line of the angle of attack, you have a lifting surface. The rule of thumb here is the faster you go, the more lift you get. Basic laws of physics apply and air brakes don't work in that scenario. Ron Last edited by namba209; 11-12-2003 at 09:01 PM..

11-13-2003	#36 (permalink)
baz opel free after 25 years Join Date: Jun 2002 Location: sunderland england Posts: 4,669 Classified Rating: 0% (0)	just dont do it before you put the wheels on top first hence my tag line my head still hurts 12 weeks later Last edited by baz; 11-13-2003 at 06:44 PM..

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10-29-2003	#26 (permalink)
2.3T_GT Opeler Join Date: Aug 2003 Location: elko, NV Posts: 15 Classified Rating: 0% (0)	i didn't think of using it to cool the brakes, and that would also be a good use for it. but like i said if you could channel it to the rear wouldn't it give an appreciable decrease in the pressure differance back there being created by the "abrupt" end of the car. i remeber somebody saying this is what causes a good portion of the drag and rear end lifting on our cars.

11-11-2003	#27 (permalink)
bear785 Opeler Join Date: Jul 2003 Location: lawrence, ks Posts: 10 Classified Rating: 0% (0)	when I was thinking of ideas for my opel when I convert it to elec. For longer trips I was going to fab up a tail cone to house a ic generator and remove the abrupt end all together

11-11-2003	#28 (permalink)
Cypher Opeler Join Date: Aug 2003 Location: Tulsa, Oklahoma Posts: 22 Classified Rating: 0% (0)	Ok, I have a real problem with the "plating the underside" thing. In theory it is a great idea. In fact mercedes had the same idea. They did it with one of their cars, I believe the SLK Le Mans car. Anyway, they had 3 cars turn into "airplane wings" before the season was half way over. Some of you may recall seeing the video of this a few years back. Seems that under certain circuimstances the under cladding had the opposite effect. and for you who did not see the video. The mercedes started to slowly lift at the nose, and then abruptly flipped end over end. I believe the guy did 9 some odd flips in mid-air in under 3 seconds. Not my idea of fun

11-11-2003	#29 (permalink)
Cypher Opeler Join Date: Aug 2003 Location: Tulsa, Oklahoma Posts: 22 Classified Rating: 0% (0)	They also had the same problem with the Porsche GT1, but I think it may have been another cause

11-11-2003	#30 (permalink)
West Coast GT Member Join Date: Aug 2003 Location: San Francisco Bay Area Posts: 839 Classified Rating: 0% (0)	Cypher - I've seen a video clip of a race car doing a back flip just like a speed boat does. I think it was yellow, halfway down a short straight. Sound like the same one you're referring to?

11-13-2003	#33 (permalink)
baz opel free after 25 years Join Date: Jun 2002 Location: sunderland england Posts: 4,669 Classified Rating: 0% (0)	this link is to an artical on the merc flip and the reasons for it http://www.mulsannescorner.com/techarticle1.htm

11-13-2003	#34 (permalink)
namba209 5,000 Post Club Join Date: Aug 2002 Location: Imperial Beach, CA South of San Diego Posts: 5,974 Classified Rating: 0% (0)	Yeah Baz, that explains exactly what I referred to. I went so far as to query an unlimited racing boat mech why they couldn't put a gyro in the boat to automatically actuate the front spoilers and horizontail tail piece to dump the lift if the boats exceed a specific angle of attack. The response was the rules prohibit any "automatic" trimming of the boats, even to keep it from flipping over. and possibly injuring the drivers. Oh well, I'm just an old Air Force jet mech that doesn't know anything about aerodynamics, I guess. The last aircraft I was a crew chief on just happened to be the worlds fastest, highest flying, production aircraft made. It cruised at 2194 MPH at an altitude in excess of 80,000 feet. So that doesn't give me much credence. Ron

11-13-2003	#35 (permalink)
baz opel free after 25 years Join Date: Jun 2002 Location: sunderland england Posts: 4,669 Classified Rating: 0% (0)	i didnt know the US Airforce had that many british kites and i thought NeverAchieveSpaceAgain used to fly a brick that went faster than that????? the thing to do must be to put the wheels on the roof and use the shape to get down force this will mean we will all have to use the hyundi pony safty belt because it will be a pain to put the lap and sholder belts on 1 at a time

11-13-2003	#37 (permalink)
namba209 5,000 Post Club Join Date: Aug 2002 Location: Imperial Beach, CA South of San Diego Posts: 5,974 Classified Rating: 0% (0)	I think if I was in that car may head would hurt for a while too. British Kites? NASA has the shuttle and the USAF had the Dyna Soar program along with the X series aircraft, but none were production type aircraft, and all of them, except for the shuttle and X-15 are slower than the SR-71. Wheels on top? I think I've seen a radio controlled car that had that configuration. I like the seat belt idea but it would still be a pain to get in and out of the car with it upside down. Ron

05-14-2007	#38 (permalink)
jvandyke Opeler Join Date: May 2006 Location: Hudsonville, Michigan, USA Posts: 1,788 Classified Rating: 0% (0)	Reading through some period reviews of the GT they mention (usually with approval) the use of the Kamm tail to reduce drag. I see in this thread the tail implicated as being draggy. Also wondering if the Steinmetz kit is good for this (I'd imagine that's why it's out there, reduce drag). Curious.

06-10-2007	#39 (permalink)
carter840 Opeler Join Date: Jan 2007 Location: NYC Posts: 24 Classified Rating: 0% (0)	I have always wondered what the acceleration of the GT is like. Could someone give me the 0-60 times on a 1.9L engine. thanks

06-10-2007	#40 (permalink)
jordan Moderator Join Date: Mar 2003 Location: corning ny 14830 Posts: 2,107 Classified Rating: 100% (1)	R&T tested the gt 1.9l 0-30mph @ 3.6 seconds 0-40mph @ 5.5 seconds 0-50mph @ 7.4 seconds 0-60mph @ 10.8 seconds 0-70mph @ 14.7 seconds 0-80mph @ 19.1 seconds 0-100mph @ 34.0 seconds 1/4mile time of 17.7 seconds @ 77mph

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