67newport
Old Man with a Hat
The (BB-38) USS Pennsylvania opening fire on Japanese positions on the island of Guam. July 21, 1944.
Heavy Metal
- Thread starter amazinblue82
- Start date
67newport
Old Man with a Hat
German battleship Bismarck as seen from the heavy cruiser Prinz Eugen as the two ships practiced towing and refueling by trailing hose, circa April-May 1941.
67newport
Old Man with a Hat
USS Enterprise (CV-6), one of the few pre-WW2 aircraft carriers to survive and the most decorated US Navy Warship in WW2, being towed to be sold for scrap, August 21, 1958
67newport
Old Man with a Hat
USS Nevada before, during, and after suffering a direct hit from a nuclear bomb - perhaps this is why she received the nickname “the unsinkable ship
67newport
Old Man with a Hat
IJN Yamashiro undergoes post-reconstruction trials off Tateyama, Japan, Dec 24, 1934
67newport
Old Man with a Hat
Ships of the US fleet at Ulithi Atoll, Caroline Islands, 8 Feb 1945. Visible are 7 large carriers, 3 light carriers, 3 battleships, and numerous cruisers, destroyers, and support vessels including 1 hospital ship.
67newport
Old Man with a Hat
USS Portland (CA-33) at Pearl Harbor, 14 June 1942, with her crew paraded on deck. Note the external degaussing cable fitted to the hull side of this ship.
Slap Stick
Active Member
Unfortunately it sank at Pearl Harbor in the Japanese raid on 12/7/41.
3175375
Senior Member
Yes it was actually beached to prevent blocking the entrance to Pearl Harbor.
It eventually did see its demise:
Nevada was subsequently salvaged and modernized at Puget Sound Navy Yard, allowing her to serve as a convoy escort in the Atlantic and as a fire-support ship in five amphibious assaults (the invasions of Attu, Normandy, Southern France, Iwo Jima, and Okinawa).
At the end of World War II, the Navy decided that, due to age, Nevada would not be retained as part of the active fleet and she was instead assigned as a target ship for the atomic experiments at Bikini Atoll in July 1946 (Operation Crossroads). The ship was hit by the blast from atomic bomb Able, and was left heavily damaged and radioactive. Unfit for further service, Nevada was decommissioned on 29 August 1946 and sunk for naval gunfire practice on 31 July 1948.
Slap Stick
Active Member
Yes, it was beached but it slid into deeper water and sank.
70bigblockdodge
Old Man with a Hat
Never went under, refloated, repaired returned to service saw action in Pacific and provided shore bombardment prior to D day. In the Nuclear test it would not sink and was only sunk after alot of naval gunfire (before missles) to finally put her beneath the waves.
15K ft under, ole number 36, off Pearl Harbor as noted in #1029
It had been found in 15,000 feet of water, purposely sunk by the Navy in 1948 after a career that spanned three decades of service, from World War I to the atomic bomb.
The Nevada had fought on D-Day in 1944 off Normandy and, reequipped with guns from the shattered Arizona and USS Oklahoma, fought again at the battles of Iwo Jima and Okinawa in the Pacific. After the war it had been painted orange and used as a test ship at the Bikini Atoll atomic bomb detonations in 1946.
The Nevada survived again, but in 1948 the vessel, possibly still radioactive, was sunk by naval guns, explosives and torpedoes 65 miles southwest of Pearl Harbor, said maritime archaeologist James P. Delgado, of Search Inc., one of two firms that found the wreck in April.
It took the Navy 4½ days to hammer the Nevada to the bottom. Afterward, a funeral, with chaplain and crew, was held on the USS Iowa over the site where the ship had gone down, Delgado said.
The Nevada had fought on D-Day in 1944 off Normandy and, reequipped with guns from the shattered Arizona and USS Oklahoma, fought again at the battles of Iwo Jima and Okinawa in the Pacific. After the war it had been painted orange and used as a test ship at the Bikini Atoll atomic bomb detonations in 1946.
The Nevada survived again, but in 1948 the vessel, possibly still radioactive, was sunk by naval guns, explosives and torpedoes 65 miles southwest of Pearl Harbor, said maritime archaeologist James P. Delgado, of Search Inc., one of two firms that found the wreck in April.
It took the Navy 4½ days to hammer the Nevada to the bottom. Afterward, a funeral, with chaplain and crew, was held on the USS Iowa over the site where the ship had gone down, Delgado said.
source: https://www.washingtonpost.com/history/2020/05/25/uss-nevada-wreck-discovered-pearl-harbor/
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Heavy Metal .. RC style.
warm day last fall a guy and his kid where at the playground of a school near my house. I heard and saw a fast moving RC jet .. didnt believe it.
Wasnt what's in this video, but they clearly exist. wouldn't a thought it.
wonder if it pulls "g's" in proportion to its size, or greater?
interesting..
warm day last fall a guy and his kid where at the playground of a school near my house. I heard and saw a fast moving RC jet .. didnt believe it.
Wasnt what's in this video, but they clearly exist. wouldn't a thought it.
wonder if it pulls "g's" in proportion to its size, or greater?
interesting..
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Slap Stick
Active Member
If it ain't floating and it ain't beached any longer, it is sunken.
67newport
Old Man with a Hat
Advertised on Pinterest as a " Fully Loaded1929 Mack AC Tractor with Bucyrus crane". Seems like if you wanted something moved, Mack truck folks were the people you called.
1916 - The famous AC model was introduced in 1916. With its chain drive rear axle, the AC model earned an unparalleled reputation for reliability and durability, and was called on to help accomplish nearly impossible military and civilian tasks. The AC model was manufactured continuously through 1939 -- a remarkable 24 years, and 40,299 were built.
The AC is not only credited with giving Mack its famous Bulldog identity, but also with achieving a degree of success and international fame that has never been accomplished by any other motor truck in history.
source: Mack Trucks "YEARS"
The AC is not only credited with giving Mack its famous Bulldog identity, but also with achieving a degree of success and international fame that has never been accomplished by any other motor truck in history.
source: Mack Trucks "YEARS"
70bigblockdodge
Old Man with a Hat
Let see that attitude if you one of the asses onboard.
Stuck in the mud is way better than on the bottom blown apart like the Arizona.
I had to answer my own question: from what I see (and asking my aerospace engineer daughter who works for USAF for a general confirmation) and understood (without getting a headache) is the RC g's are, like any other airframe, are limited by its structure and power-to-weight ratios.
a thread attached where a modeler asked his fellow RC crowd about g's in their scale vs full size aircraft.
I conclude that, like for many model machines, humans could not survive the full-size "g" ride in many cases -- and structurally neither could some of our full-size machines:
Post#4
Here is my take on it from my rather rusty knowledge of aerodynamics.
In balanced (no sideslip) level flight in a banked turn, g force is 1/cos(angle of bank). (I'll call it g force but really g is an acceleration and is a multiple of acceleration due to gravity which is 9.81 m/s/s).
So at 60 degs, g = 2
75 deg, g = 3.86
80 deg, g = 5.76
85 deg, g = 11.47
Whether any particular aeroplane can fly at a particular angle of bank depends on how much lift it can produce. 10g basically means that the lift force is 10 times the weight of the aeroplane. The ability to generate this much lift depends on airspeed and coefficient of lift, which is closely related to angle of attack.
When you try to turn or pull up too hard what you are doing is increasing the angle of attack up to and beyond the stall angle and when the wing stalls lift is reduced. Maximum lift is achieved at maximum airspeed and at an angle of attack just below the stall, provided of course that the wings don't fall off
.
As an example, my Jazz weighs about 90 oz. Motocalc says (very rough) that at maximum lift at full power is produced at an angle of attack of 7 deg and lift is 520oz. 520/90 = 5.8g.
Now I expect Motocalc's modelling of lift is a bit conservative but the figures are of the right order. In a dive, airspeed would be higher which would increase lift but I doubt if g force would get beyond about 7g.
What enables an F16 to pull 10+g and a Cessna 172 only about 2-3g (other than structural factors) is basically power. The Cessna wing stalls long before it is able to increase the lift force to 10 times weight. With our model aeroplanes, we can achieve very high power to weight ratios (Cessna 172 models that can climb vertically!) so perhaps we can get towards 10g with fast aircraft.
Here is my take on it from my rather rusty knowledge of aerodynamics.
In balanced (no sideslip) level flight in a banked turn, g force is 1/cos(angle of bank). (I'll call it g force but really g is an acceleration and is a multiple of acceleration due to gravity which is 9.81 m/s/s).
So at 60 degs, g = 2
75 deg, g = 3.86
80 deg, g = 5.76
85 deg, g = 11.47
Whether any particular aeroplane can fly at a particular angle of bank depends on how much lift it can produce. 10g basically means that the lift force is 10 times the weight of the aeroplane. The ability to generate this much lift depends on airspeed and coefficient of lift, which is closely related to angle of attack.
When you try to turn or pull up too hard what you are doing is increasing the angle of attack up to and beyond the stall angle and when the wing stalls lift is reduced. Maximum lift is achieved at maximum airspeed and at an angle of attack just below the stall, provided of course that the wings don't fall off
As an example, my Jazz weighs about 90 oz. Motocalc says (very rough) that at maximum lift at full power is produced at an angle of attack of 7 deg and lift is 520oz. 520/90 = 5.8g.
Now I expect Motocalc's modelling of lift is a bit conservative but the figures are of the right order. In a dive, airspeed would be higher which would increase lift but I doubt if g force would get beyond about 7g.
What enables an F16 to pull 10+g and a Cessna 172 only about 2-3g (other than structural factors) is basically power. The Cessna wing stalls long before it is able to increase the lift force to 10 times weight. With our model aeroplanes, we can achieve very high power to weight ratios (Cessna 172 models that can climb vertically!) so perhaps we can get towards 10g with fast aircraft.
Post #8 Response to Post #4
your assessment is right-on! The amount of g-force an air vehicle can withstand is totally dependent upon it's structure, the amount of g-force an air vehicle can generate is dependent upon it's speed and aerodynamics (CL max), once an air vehicle exceeds it's CL max it will depart or destruct. At extremely high speed it is much more difficult to get to CL max than it is at low speed, SR-71 for example!
your assessment is right-on! The amount of g-force an air vehicle can withstand is totally dependent upon it's structure, the amount of g-force an air vehicle can generate is dependent upon it's speed and aerodynamics (CL max), once an air vehicle exceeds it's CL max it will depart or destruct. At extremely high speed it is much more difficult to get to CL max than it is at low speed, SR-71 for example!
In the world of RC modeling, low Reynolds Number, you can get away with a lot that you could not do in a full scale with a human in the cockpit, although many WWII era spruce built biplanes can withstand +12g's, current day high performance fighters are limited to +9/-3 g's (structural limits), the g-onset rate is what causes pilot G-LOC, Loss-Of-Consciousness, pilots train to withstand sustained high g-loadings.
The way to test your model for structural integrity is to do it the same way full scale planes are done. In a static rig, support the fuselage and load the wings with evenlly distributed weights until they fail.
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source: Mack AC / AK / AP (Commercial vehicles) - Trucksplanet
The most significant contribution to developing of the Mack company was made by engineer Alfred Masury. In 1916 he designed the most famous Mack truck - the AC model with the informal name "Bulldog", which was given for its massive tapered hood, low silhouette and widely spaced wheels, huge headlamps and ability to work in the toughest conditions.
The AC model offered in several versions with a capacity of 3,5-7,5 tons and wheelbase of 3962, 4267 or 4572 mm. In-line 4-cylinder engine with an output of 75 hp was located directly above the front axle.
The radiator was placed in front of the driver's seat and cooled by air flow from the impeller, mounted in the flywheel. The four-speed gearbox was placed in the middle of the chassis and combined with the main gear and differential. The truck had chain drive.
The company received 18 patents during developing of the AC model. Among them is the frame, stamped from chrome-nickel steel, pistons made of cast iron and cast in pairs of stainless steel cylinders with a heat treatment, metal working parts, reinforced by the surface seal and a number of parts from aluminum alloys.
Crankshaft and pinion were cemented, and a beam front axle was made by free forging of steel billets. Other features of the AC model included long-leaf springs with a small thickness, the widespread use of roller bearings, brakes on rear wheels and a transmission shaft, and a wide cast tires.
From 1923 all AC trucks were equipped with a 6-cylinder engine with an output of 97-120 hp. From 1932, construction dump trucks AC6 with a 6-cylinder 150-horsepower engine were produced.
The AC series is well known for its strength and durability. Without great technical changes it produced till 1938. Totally 40,299 copies were made.
The AC model offered in several versions with a capacity of 3,5-7,5 tons and wheelbase of 3962, 4267 or 4572 mm. In-line 4-cylinder engine with an output of 75 hp was located directly above the front axle.
The radiator was placed in front of the driver's seat and cooled by air flow from the impeller, mounted in the flywheel. The four-speed gearbox was placed in the middle of the chassis and combined with the main gear and differential. The truck had chain drive.
The company received 18 patents during developing of the AC model. Among them is the frame, stamped from chrome-nickel steel, pistons made of cast iron and cast in pairs of stainless steel cylinders with a heat treatment, metal working parts, reinforced by the surface seal and a number of parts from aluminum alloys.
Crankshaft and pinion were cemented, and a beam front axle was made by free forging of steel billets. Other features of the AC model included long-leaf springs with a small thickness, the widespread use of roller bearings, brakes on rear wheels and a transmission shaft, and a wide cast tires.
From 1923 all AC trucks were equipped with a 6-cylinder engine with an output of 97-120 hp. From 1932, construction dump trucks AC6 with a 6-cylinder 150-horsepower engine were produced.
The AC series is well known for its strength and durability. Without great technical changes it produced till 1938. Totally 40,299 copies were made.
