Twin engine XB-70, well maybe.
05-06-2003, 10:09 PM
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Twin engine XB-70, well maybe.
I have plans to build a XB-70, but before I start to build it, I need to decide weather to build it with a pusher or twin propfans, power will be ASP's .90 s strokes.
My question is do any of you know any thing about these prop fans? where to get them, and some info about them.
thanks for looking and helping if you can, i want to start so bad, but this is a decision i have to make before i start ot build.
My question is do any of you know any thing about these prop fans? where to get them, and some info about them.
thanks for looking and helping if you can, i want to start so bad, but this is a decision i have to make before i start ot build.
05-06-2003, 10:17 PM
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Twin engine XB-70, well maybe.
LOL, all though my name is Dago Red but the XB is my fav plane of all. Dago 2nd.
I chose this plane becasue its differ, and if you check my gallery, thats what im all about almost. I have all the measurments worked out, and should have enough power to move the plane, i might have to take it to LARKS to test fly it, id rather take off from a concrete runwasy with this plane rather than a grass runway
I chose this plane becasue its differ, and if you check my gallery, thats what im all about almost. I have all the measurments worked out, and should have enough power to move the plane, i might have to take it to LARKS to test fly it, id rather take off from a concrete runwasy with this plane rather than a grass runway
05-07-2003, 03:37 AM
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Twin engine XB-70, well maybe.
SALMONBUG:
Not so, sir. The B-70 never got too far over 3000 mph, the SR-71 set a speed record from France to the West Coast of the USA, at an average speed around 3600 mph. Mach 6+. And that included slowing twice for refuelling.
The A-11 and the YF-12A could exceed Mach 7 for a short time, the SR-71 was a development from the same airframe.
Bill.
PS: Check the FAI site for records. wr.
...and speed of a sr71.
The A-11 and the YF-12A could exceed Mach 7 for a short time, the SR-71 was a development from the same airframe.
Bill.
PS: Check the FAI site for records. wr.
05-07-2003, 08:07 AM
#6
Twin engine XB-70, well maybe.
yes yes william I know my classics, the valkyrie never flown faster than a little above M3 because of the stupid tendency he had to loose a part of his honeycomb skin in flight
my above sentence was a kind of "hyperbol"
my above sentence was a kind of "hyperbol"
05-07-2003, 10:55 AM
#7
Twin engine XB-70, well maybe.
William, I think you will find that the SR-71 does a little over mach 3 not mach 6. As for the the A-12 exceeding mach 7. The world record for the fastest manned flight is held by the X-15 at Mach 6.7 or 4520 MPH on 3 Oct 1967 by W J knight. I believe the max estimated speed of the A-12 is about M 3.3. The XB-70 was hoped to come close to the SR-71 but fell slightly short.
05-07-2003, 02:04 PM
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Twin engine XB-70, well maybe.
GRANT ED:
Official posted speeds and world records do not reflect true capabilities.
We could make the round trip, Okinawa to San Francisco and return, in a little over two hours.
Figure it for yourself.
Bill.
Official posted speeds and world records do not reflect true capabilities.
We could make the round trip, Okinawa to San Francisco and return, in a little over two hours.
Figure it for yourself.
Bill.
05-07-2003, 04:16 PM
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Twin engine XB-70, well maybe.
On September 1, 1974 Major James V. Sullivan, 37 (pilot) and Noel F. Widdifield, 33 (reconnaissance systems officer) (photo inset), flashed across the starting line (radar gates in New York) at approximately 80,000 feet and speed in excess of 2,000 miles per hour. Exactly 1 hour 54 minutes and 56.4 seconds later, they had set a new world speed record from New York to London England. The average speed was 1,807 statute mph over the 3,461 statute mile course, slowing to refuel one time from a specially modified KC-135 refueling tanker. The aircraft was placed on static display at Farnborough Air Show for 1 week. It marked the first time the secret plane had been on public display outside of the United States. Clarence L. "Kelly" Johnson (photo inset), the aircrafts designer, was on hand for the event. He remarked, "It (the SR-71) has exceeded all my expectations."
ok let's make some calculations
thrue airspeed= 2000 MPH
altitude of 80000 mean a temperature of something like -60 degrees celsius (tropopause)
-60 celsius=213 kelvin
20*sqr (213)=291, so the spped of sound was around 291 m/s
2000 MPH= 894 m/s
894/291= 3.07
so our SR71 was flying around mach 3
ok let's make some calculations
thrue airspeed= 2000 MPH
altitude of 80000 mean a temperature of something like -60 degrees celsius (tropopause)
-60 celsius=213 kelvin
20*sqr (213)=291, so the spped of sound was around 291 m/s
2000 MPH= 894 m/s
894/291= 3.07
so our SR71 was flying around mach 3
05-07-2003, 04:28 PM
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Twin engine XB-70, well maybe.
Philippe:
I repeat myself.
Bill.
Originally posted by William Robison
Official posted speeds and world records do not reflect true capabilities.
Official posted speeds and world records do not reflect true capabilities.
Bill.
05-07-2003, 04:41 PM
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Twin engine XB-70, well maybe.
Philippe:
The distance from Okinawa to San Francisco in a bit over 6000 miles, our time was really a lot closer to three hours than two.
We stopped the clock at the California coast, flew inland to refuel, and restarted the clock passing SF on the way back. On course total time, to and from, not quite three hours.
As I said, posted soeeds and world records do not always reflect true capabilities.
Bill.
The distance from Okinawa to San Francisco in a bit over 6000 miles, our time was really a lot closer to three hours than two.
We stopped the clock at the California coast, flew inland to refuel, and restarted the clock passing SF on the way back. On course total time, to and from, not quite three hours.
As I said, posted soeeds and world records do not always reflect true capabilities.
Bill.
05-07-2003, 05:16 PM
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Twin engine XB-70, well maybe.
Philippe:
If you look at the pictures of the plane, note the cones in the engine air intakes. These moved back and forth to keep the compressor inlet air speeed subsonic. When they were fully forward there was only a very small gap left for the intake, additional doors were near the back of the nacelles for dynamic air intake.
Johng:
I was long gone from them before they became known as the "Blackbird." We just called them the "Sled."
Bill.
If you look at the pictures of the plane, note the cones in the engine air intakes. These moved back and forth to keep the compressor inlet air speeed subsonic. When they were fully forward there was only a very small gap left for the intake, additional doors were near the back of the nacelles for dynamic air intake.
Johng:
I was long gone from them before they became known as the "Blackbird." We just called them the "Sled."
Bill.
05-07-2003, 05:25 PM
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Twin engine XB-70, well maybe.
here is a guy who worked on it answering the questions
real info or intox?
http://www.wvi.com/~lelandh/sr-71~1.htm
real info or intox?
http://www.wvi.com/~lelandh/sr-71~1.htm
05-07-2003, 06:11 PM
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Twin engine XB-70, well maybe.
Philippe:
Very interesting site.
Here's a quote:
Does that give you a hint?
Bill.
Very interesting site.
Here's a quote:
The SR-71 cruises at Mach 3, with a reported top speed of Mach 3.2 some contest this is a low estimate the government gives to keep certain aspects of the former spy plane a secret. According to Schmidt, at Mach 3 the SR-71's pilots must throttle hack to keep the plane from naturally climbing to faster speeds. We've got no problem with thrust," he said.
Bill.
05-07-2003, 06:56 PM
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SR-71......
Gentlemen.....I'm not knowledgeable enough to say what the SR-71 will or will not fly at speed wise....although I do know several ex AirForce mechs that have "mentioned" the mach 3 number was low..........I will also mention that I became quite friendly with the British Airways mechs here in MIA when the Concorde was routinely flying in and out...and got very acquainted/fond of the Concorde...its a fascinating airliner to say the least....one thing they all agreed on was the plane was capable of speeds up to mach 3+ except the skin could not handle the temp rise....a small temp bulb about 12 inches from the nose tip would limit airspeed by max temp.......once 160* C reached thats all the speed it would reach.......roughly mach 2.......At T/O thrust with AB...each engine consumed 30k lbs/hr....the fuel burn from Miami to London was the same as a 747....roughly 150k pounds.......Bill....
05-07-2003, 08:12 PM
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Twin engine XB-70, well maybe.
I read that thrust was actually kept at 25% when they reached cruising speed and altitude to keep fuel consumption down...
William Robison...which one did you fly most often?...I prresume you flew the A-12's...
William Robison...which one did you fly most often?...I prresume you flew the A-12's...
05-07-2003, 09:16 PM
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Twin engine XB-70, well maybe.
SALMONBUG:
Please translate. What does this mean?
Bill.
PS: I never got in the "SR" version. wr.
William, sr71 pilot, I am on the ass
Bill.
PS: I never got in the "SR" version. wr.