Landracing Forum
Thrust-powered Land Speed information => Discussions on absolute land speed records => Topic started by: J79 on June 02, 2016, 04:50:36 PM
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Shows Jessi Combs driving the F104 Eagle to 440mph.
At 3:40 you can see the car leaving and sucking dust into the intakes. A second through a few seconds later, you see the exhaust and it looks like a small amount and then a lot of dust is exiting the exhaust. My question is, is that dust coming from the intakes and out the exhaust or does the turbulent air around the exhaust make it look like it's coming from the exhaust?
Does anyone have any video links for other thrust powered turbine cars sucking dust into the intakes?
Does this car have the lowest intakes when compared to a turbine engine thrust powered plane?
Does this car have a full roll cage to protect the driver like a dragster/funny car? I'm assuming it doesn't since there would be little room inside for such.
https://www.youtube.com/watch?v=TswO_fO-gu0 (https://www.youtube.com/watch?v=TswO_fO-gu0)
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Every time we run the Eagle, when we return home, we do a complete wash down of the engine internals and dry it out by conducting an engine run. After that, we borescope the engine to look for any damage. After all the runs in the dirt, we've been fortunate to come away with no damage. Part of the reason is that we do a very good fod patrol. Another part of the reason is the J-79 is one tough engine and can take a great deal of abuse. We've made a total of 48 runs with 44 of them having been on dirt (Black Rock, El Mirage, Edwards AFB and Alvord Dry Lake). A great deal of the dirt you see coming out of the engine is exactly that, dirt! We roll out very gingerly to about the 1/2 mile mark and reaching about 150 mph before you go into full military power. At that point, the engine is turning 7400 rpm and is now sucking all the air it can digest. Then, roll the throttle into minimum afterburner and when you get a good light you push it into full AB. Now you're rolling along quite nicely. You are now at about the 1 mile and just keep it pointed toward that V in the mountains about 30 miles away!
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Roll cage! We've discussed that many times over the years. The general feeling is that it wouldn't do you any good at 500 to 1000 mph anyway. If it did, they would have them in all the fighters. There is no real structural framework to attach the cage to anyway. If you look inside most of the absolute land speed cars, they have little or no roll cage either. We figured the best and safest practice is to build stability into the vehicle using advanced aerodynamic concepts and validating the concepts through data aquired on each and every test run. At this point in time, at 500+, the Eagle ran straight as an arrow with nearly no steering input. The aerodynamics of the Eagle have also shown a small increase in down force throughout the length of the fuselage. Our CFD analysis indicates we will receive about 800 lbs of lift as we transition into transonic. With 5300 lbs static on the nose, 800 lbs of lift is not very much. We also have the ability to change the angle of attack of the canards on the nose to increase or create more down force as necessary.
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Roll cage! We've discussed that many times over the years. The general feeling is that it wouldn't do you any good at 500 to 1000 mph anyway. If it did, they would have them in all the fighters....
Ed, had Craig Breedlove tell us basically the same thing the last time he tested a Jet Car on the salt. We were looking at his new car, and mentioned that it didn't seem to have any roll structure... there was just a cockpit sticking out the front
He said "you don't build a Learjet to be able to crash it into a mountain"....
Hope you get to check the transonic and sonic stability... we are cheering for you Ed :cheers:
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About 9+ min you see a mirage of the Eagle in the mirage? 1st time I've seen that!
JL222