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Post by magnesium on Apr 12, 2015 7:14:02 GMT -6
Unfortunately there was no nostalgia for sleds back then. As for magnesium, aircraft manufacturers don't use much of it. It's light but not durable.Bill's 650 vintage race sled is the ultimate "what if?" Rupp. They could have built something close to it in 73-74.
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Post by mrmotors on Apr 12, 2015 11:20:31 GMT -6
Current aircraft manufacturing doesn't use much of it. Older aircraft are full of it, in particular the WWII aircraft that I am around. I have a German Argus engine in my shop I am reworking for a fellow. It is an inverted, air-cooled V-12, the crankcase is magnesium... can pick it up with one hand. As far as magnesium tunnels for the 3d sleds, if they were weak to start with and the very limited number of them built, it's conceivable any spares would have just corroded away into swiss cheese. That is partially the reason I am building new slide rails for my F/A, the junction between the aluminum spring plate and the slide rails were a big hairy white pile of corrosion, mostly on the magnesium side, hadn't started in on the aluminum.
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Post by magnesium on Apr 12, 2015 13:30:08 GMT -6
There was an engineer/designer of German descent who worked for Wright Aeronautical. Rudy, can't remember his last name. Even though fighter engines were heavy,he wouldn't use magnesium in their engines...he said it was too cheezy.Mrmotors,if you get your hands on a Rolls Royce Crecy, let me know. I'd pay just to see one.
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Post by mrmotors on Apr 12, 2015 15:42:03 GMT -6
The Curtiss-Wright R3350 weighs around 4000 Lbs, the Pratt R-4360 probably closer to 5000 lbs, the Bristol Centaurus sleeve valve radial weighs around 4500 lbs. Those are big heavy engines, little ol' Merlin weights around 1800 lbs while an Allison is somewhat lighter yet. A RR Crecy? The only place I know where one of those is at is Rolls Royce in the UK. I don't know if any of them are currently in service anywhere, will have to see.
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Post by magnesium on Apr 12, 2015 16:54:33 GMT -6
I didn't know that a Merlin was that light. Good racing motor! You're right about the Crecy, only one was kept and it's at the RR museum.
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Post by mrmotors on Apr 12, 2015 20:38:27 GMT -6
That is why a Mustang (P-51) makes a good racer. Our airplane was right at 7000 lbs empty weight as set up for racing. Probably loaded with fluids and driver for a Sunday race would make it right at 8000. The airplanes with the big radials would be pretty close to twice that on the ramp. 3 G's on a Mustang bleeds off less speed than 3 G's on a Sea Fury...... And it turns a lot better.....
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Post by snosnake on Apr 12, 2015 20:50:14 GMT -6
Hey I think there is a proper site for all of this dirty talk.
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Post by mrmotors on Apr 12, 2015 22:16:44 GMT -6
Hey, it's racing...just not on the snow....
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Post by magnesium on Apr 13, 2015 7:29:10 GMT -6
Hey, it's racing...just not on the snow.... Mickey Rupp flew a P51, good choice.
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Post by snosnake on Apr 13, 2015 8:25:50 GMT -6
He crashed that P51 too.
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Post by mrmotors on Apr 13, 2015 9:05:19 GMT -6
That's correct, it was crashed, however the situation is a bit more involved than just crashing it. He also had a pelican come through the canopy one time and almost cost him his eye..... Was very lucky on that one.
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Post by magnumed on Apr 16, 2015 6:03:33 GMT -6
In closing for me I wanted to add to this post and comment on creditable information with this subject. It may seem trivial at this point wether it is or isn't. Years down the road when it's for sale or setting in a museum and portrayed as a real 3D because someone said so because they know is ridiculous. You have to have reliable, credible information. How do you get this after 40 plus years? You have to have pictures and or rely on those people that do know. The few pictures that do exist do give some information. The people that know have giving their thoughts. Someone seeing the sled back in the day once or saying someone told them may be creditable to some but I doubt many. If we just make up information and say it's so it is a disservice to the people that built and raced the sleds back in the day. It's nice to dream but some need to wake up. Some like to tell their story from back in the day and they tend to be neat stories but when mistakes are clearly made on what was seen then how creditable is the rest of the story.
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Post by kronnikracing on Apr 16, 2015 6:48:01 GMT -6
Ed could you post some pics and info on your 3d? I think guys would maybe get a kick out of information on yours as well.
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Post by magnesium on Apr 16, 2015 8:17:53 GMT -6
Ed is right about info that comes with a "find". 30 years ago I bought a mint 71 600 Magnum chassis from a retired Rupp dealer. Seat and hood suspension etc but no drivetrain.The seller told me it was Rupp's demonstrator for promoting the 1971's.That's why the hood had custom pinstriping.Never raced.This past winter I noticed the "shadow" of a name in the red paint when the light was right.(pacemaker). Also someone on this board mentioned that Rupp lent 600's out to qualified racers and took them back at the end of the 71 season. Now I have serious doubts about the demonstrator story from the old Rupp dealer. After all,he was a salesman. Does it cheapen the value of it,to me? No,but I believed that story to be true for 30 years.
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Post by magnumed on Apr 16, 2015 8:26:28 GMT -6
Ed could you post some pics and info on your 3d? I think guys would maybe get a kick out of information on yours as well. Ed posted a link on the thread identify this bulkhead, what kind of kick are you looking for? What questions do you have? More than happy to tell you what I have and what I have been told by the builder it is......
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Post by kronnikracing on Apr 16, 2015 9:19:41 GMT -6
Cool ive never seen that link before.
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Post by Hoots on Apr 16, 2015 9:27:00 GMT -6
Cool ive never seen that link before. Luke, I liked it the way it was before. I have been wondering that question for some time myself but understand.
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Post by kronnikracing on Apr 16, 2015 9:31:53 GMT -6
Cool ive never seen that link before. Luke, I liked it the way it was before. I have been wondering that question for some time myself but understand. Yeah Hoots i know what you mean. I guess i have seen that post years ago because i posted on it but forgot it was there. I guess i was more so looking for what parts did Ed's all come WITH and what did he HAVE to fab. Pretty simple question but im sure it will be taken the wrong way and ill be beat up for asking but oh well.
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Post by magnumed on Apr 16, 2015 10:31:51 GMT -6
Luke, first look at the pics of the tunnel and bulkhead, Can you identify this? Can you identify the sled as a 3rd Dimension? What are your thoughts?
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Post by kronnikracing on Apr 16, 2015 10:39:20 GMT -6
Luke, first look at the pics of the tunnel and bulkhead, Can you identify this? Can you identify the sled as a 3rd Dimension? What are your thoughts? Now Ed why do you have to be like that? Sure looks like magnesium to me! But what were the other parts that came with the bulkhead and tunnel that were included? Rupp made magnesium slide rails for FA's correct? Im just asking a simple question and you just get an attitude right away. Its a cool sled and i asked. Big woop.
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