red admiral,red admiral said:It is doubtful the L-1000 turbojet ever worked and the stats convince me that it couldn't have ever worked. Theres more chance of Griffith's CR.1/2 32 (IIRC) spool double reverse flow turbofan working.
I thought I had a picture but I can't find it unfortunately. If you have Jet Aircraft Engines by Bill Gunston, its in there. The scheme is difficult to explain without a pictures but lets try;amsci99 said:Never heard of the Griffith, other than Metreo-Vickers. Could you tell us more?
Information on Griffith's CR.1/2 32 is suprisingly hard to find unlike the Metropolitan-Vickers F.1 & F.2 axial flow turbines. Are we referring to Griffith's work on 'contraflow' jet engines when he was at the RAE and before Metropolitan Vickers took over the project?red admiral said:I thought I had a picture but I can't find it unfortunately. If you have Jet Aircraft Engines by Bill Gunston, its in there. The scheme is difficult to explain without a pictures but lets try;amsci99 said:Never heard of the Griffith, other than Metreo-Vickers. Could you tell us more?
There area bunch of individual compressor stages connect to a central shaft, outside of the compressor stage and directly connected to it is the turbine stage. Every compressor stage is driven by its own turbine stage. The air flows through the compressor along the axis and into the combustor where it is turned through 180° and exits through the periphery driving the turbine stages.
The RR Historical Society at Derby has the original, which they actually managed to get running in 1942 or 43.
I think they never did. There seems to have been at least three different versions of this engine and only one (last design) was completed after the war by Menasco.KJ_Lesnick said:How did they get 5,000 lbs of power out of 1,543 lbs of weight with early-1940's era technology?
Never posted here, but "hi" to all. I've been working on this plane off-and-on (mostly off, depending on the kids' activities) for a year as a 3D model. The wings do bear a striking resemblance to the P-80's, which was why I used the P-80 when I set about doing the image maps for the panel lines). Here are a couple renders of the unfinished model (see attachment, sorry about the second one being so big) from last year, before I started not liking it and starting over with a new version.XP67_Moonbat said:Yeah, I noticed that about the guns. Now as for the statement about P-38 wings, I'd like to recant. I went back and looked. I had read it on Wikipedia, which states they were "essentially the outer wing sections of a Lockheed P-38." But hey, it's Wikipedia.
The intake and cannon arrangement didn't make sense to me, either. Wasn't that supposed to have been four 20mm cannon in the nose, and stuffed into the intake at that? Can't imagine effect from all off the spent gasses and possible debris from the guns getting sucked into the engines. Then there's what I'm guessing are auxiliary intakes, top and bottom, toward the aft end. I'd think the bottom pair would have to be closed during taxi/takeoff/landing due to FOD. Seems like all the drawings I've seen of this plane depict it with a pair of those intakes, top and bottom. Not that there are many drawings I've found, mind you, since there seem to be very few (at least available on the Interwebs that I've found... Ha!). Scott's eAPR that featured the L-133, was interesting.XP67_Moonbat said:Yeah, I noticed that about the guns. Now as for the statement about P-38 wings, I'd like to recant. I went back and looked. I had read it on Wikipedia, which states they were "essentially the outer wing sections of a Lockheed P-38." But hey, it's Wikipedia.
I think the bit about the wings being off a P-38 is a bit of confusion. I wouldn't be surprised if it used the same airfoil as the p-38, and the planform of the wing seems to be a bit too different from the p-38. However, the constellation had what was essentially a scaled up p-38 wing, so who knows.The first time I saw drawings of the plane my first thought was how similar the wing planform looked to the P-80. I guess I never noticed resemblance to the P-38 wing. Is it me, or does it seem to have a very thick chord and airfoil. Doesn't seem like it would have been extremely fast with that thick a wing (of course, I have no engineering shingle hanging anywhere, so I'm likely wrong ).
But thats a great model J_Matthews. The one suggestion that I'd give is the "spine" of the aircraft appears to blend a bit more with the fuselage as it approaches the rear and vert stabilizer.Thank you very much! You may be right about the blend from the fuselage to the tail. However, from the images I've seen of the desktop promo models, the blend seems pretty consistent (see attached). Those images I uploaded were of the first and second iterations of my model (with my hamfisted attempts at texture mappng). I checked last night and I'm on the third, and likely last, version. As soon as I can reach a happy point regarding the exhaust area I'll start modeling the other intakes and the cockpit.
And I have to ask what are you going to do with the model when you are finished? I've been thinking about making a L-133 for X-Plane, but between the XP-77 I've been working on and a few other projects, I haven't had any time to think about making a good 3d model of it for xplane.I'll have to see about that. This has been an on-again/off-again project for the past year. I'll have idea when I'm finished. Ideally, I wanted to model a German design or two and make a few images of them dogfighting. I'll have a better idea once I'm finished ;D .
Lockheed's First Jet Design
The L-133 was Lockheed's initial design study for a jet propelled fighter. Design objectives included 600 mph top speed, 40,000-foot altitude, four 20mm canon, three hours endurance, no takeoff assistance, and one-pilot crew. Lockheed also designed the engine, designated L-1000. The final design evolved as the L-133-02 (shown here). It had a design takeoff gross weight of 18,000 pounds. In evolving the design, Lockheed built a similar, 3/4-scale, propeller-driven configuration. The design effort began in January 1942.