New pics tractor pulling arena from Finland
Tuesday, July 14, 2020
Sunday, July 12, 2020
Here is a history from the Wikipedia site about the US American engine from the second world war how everything started and the different developed versions during that time.
The Allison V-1710 aircraft engine designed and produced by the Allison Engine Company was the only US-developed V-12 liquid-cooled engine to see service during World War II. Versions with a turbocharger gave excellent performance at high altitude in the twin-engined Lockheed P-38 Lightning, and turbo-superchargers were fitted to experimental single-engined fighters with similar results.
The United States Army Air Corps (USAAC) preference for turbochargers early in the V-1710's development program meant that less effort was spent on developing suitable mechanically-driven centrifugal superchargers for the Allison V-12 design, as other V-12 designs from friendly nations like the British Rolls-Royce Merlin were already using.
When smaller-dimensioned or lower-cost versions of the V-1710 were desired, they generally had poor performance at higher altitudes. The V-1710 nevertheless gave excellent service when turbocharged, notably in the P-38 Lightning, which accounted for much of the extensive production run.
Design and development
The United States Navy (USN) hoped to use the V-1710 in its rigid airships Akron and Macon, but both were equipped with German-built Maybach VL-2 engines as the V-1710 was still in testing when the Macon was lost in February 1935 (the Akron having been lost in April 1933).
The V-1710 has 12 cylinders with a bore and stroke of 5.5 by 6 in (139.7 by 152.4 mm) in 60° V format, for a displacement of 1,710.6 cu in (28.032 L), with a compression ratio of 6.65:1. The valvetrain has a single overhead camshaft per bank of cylinders and four valves per cylinder.
Versatility and reversibility of rotation
The engine design benefited from the General Motors philosophy to build-in production and installation versatility, embracing a philosophy of modular design for aviation powerplants. The engine was constructed around a basic power section, from which different installation requirements could be met by fitting the appropriate accessories section at the rear, and an appropriate power output drive at the front. A turbo-supercharger could be used, if desired.
The accessory end had a one- or two-speed engine-driven supercharger that might have a second stage with or without an intercooler, the ignition magnetos and the customary assortment of oil and fuel pumps, all dictated by the application requirements. The front of the engine could have one of a number of different output drives. The drive might be a "long-nose" or close coupled propeller reduction gear, an extension drive to a remote gearbox, or a gearbox that could drive two wing-mounted propellers from a fuselage-mounted engine.
The V-1710 has often been criticized for not having a "high-altitude" supercharger. The comparison is usually to the later, two-stage, versions of the Rolls-Royce Merlin 60-series engines also built by Packard as the V-1650 and used in the P-51B Mustang and subsequent variants. The USAAC had specified that the V-1710 was to be a single-stage supercharged engine and, if a higher altitude capability was desired, the aircraft could use their newly developed turbo-supercharger as was featured in the XP-37(YP-37), P-38, and XP-39.
The benefits of a two-stage supercharger eventually became so clear that Allison did make some efforts in this direction. Allison attached an auxiliary supercharger in various configurations to the existing engine-mounted supercharger and carburetor. Early versions of these two-stage supercharger engines were used on the P-63. No intercooler, aftercooler, or backfire screen (flame trap) were incorporated into these two-stage V-1710 engines (except for the V-1710-119 used on the experimental P-51J, which had an aftercooler).
Although the early V-1710 powered P-39, P-40 and P-51A were limited to combat operations at a maximum of about 15,000 feet (4,600 m) they were available in comparatively large numbers and were the mainstay of some Allied Air Forces in all but the European theater of war. The engines proved to be robust and little affected by machine-gun fire. In total, over 60 percent of the post-June 1941 USAAF's pursuit aircraft operated during WWII were powered by the V-1710.
Allison slowly but continuously improved the engine during the war. The initial rating of 1,000 hp (750 kW) was incrementally increased; the final V-1710-143/145(G6R/L) was rated for 2,300 hp (1,700 kW). By 1944, the War Emergency Power rating on the P-38L was 1,600 hp (1,200 kW).
The most powerful factory variant was the V-1710-127, designed to produce 2,900 hp (2,200 kW) at low altitude and 1,550 hp (1,160 kW) at 29,000 feet (8,800 m). This engine was static tested at 2,800 hp (2,100 kW) and was planned for installation in an XP-63H aircraft. The end of the war ended this development, so this promising experiment never flew. The extra power of this version was derived from using exhaust turbines, not to drive a turbo-supercharger, but to return that energy to turning the crankshaft, called a turbo-compound engine.
Comparisons between the Allison V-1710 and the Rolls-Royce Merlin engine "families" are inevitable. What can be said for the Allison; is that it made more power at less boost, with a longer time between overhauls, and with a parts-count that was nearly half that of the Merlin engine; which greatly facilitated mass production.There was also a high degree of commonality of parts throughout the series.
The individual parts of the Allison series were producedto a high degree of standardization and reliability, using the best technology available at the time. Even after the war, racing Merlins used Allison connecting rods. As stated previously, General Motors' policies regarding versatility meant that their Allison division would also employ modular design features on the V-1710 from its "long block" core V-12 unit outwards, so that it was capable of being mated to many different styles of turbo-superchargers and various other accessories, although the variety of turbo-superchargers available for installation was limited due to the constraints of single-engine fighter design. Since it was produced in large numbers and was highly standardized, the engine has been used in many postwar racing designs. Its reliability and well-mannered operation allowed it to operate at high rpm for extended periods.
Following the war, North American built 250 P-82E/F for air defense roles into the early 1950s. This was the final military role for the V-1710.
The USAAC had earlier decided to concentrate on turbo-superchargers for high altitude boost, believing that further development of turbo-superchargers would allow their engines to outperform European rivals using displacement superchargers. Turbo-superchargers are powered by the engine exhaust and so do not draw power from the engine crankshaft, whereas displacement superchargers are coupled directly by shafts and gears to the engine crankshaft. Turbo-superchargers do increase the exhaust back-pressure and thus do cause a decrease in engine power, but the power increase due to increased induction pressures more than makes up for that decrease. Crankshaft-driven superchargers require an increase in directly driven percentage of engine power as altitude increases (the two-stage supercharger of the Merlin 60 series engines consumed some 230–280 hp (170–210 kW) at 30,000 ft (9,100 m). General Electric was the sole source for research and production of American turbo-superchargers during this period, from its four decades worth of steam turbine engineering experience.
However, mating the turbocharger with the Allison V-1710 proved to be problematic. As a result, designers of the fighter planes that utilized the V-1710 were invariably forced to choose between the poor high-altitude performance of the V-1710 versus the increased problems brought on by addition of the turbo-supercharger. The fates of all of the V-1710 powered fighters of World War II would thus hinge on that choice.
The original XP-39 was built with a V-1710 augmented by a General Electric Type B-5 turbo-supercharger as specified by Fighter Projects Officer Lieutenant Benjamin S. Kelsey and his colleague Gordon P. Saville. Numerous changes were made to the design during a period of time when Kelsey's attention was focused elsewhere, and Bell engineers, NACA aero-dynamic specialists and the substitute fighter project officer determined that dropping the turbocharger would be among the drag reduction measures indicated by borderline wind tunnel test results; an unnecessary step, according to aviation engineer and historian Warren M. Bodie. The production P-39 was thus stuck with poor high-altitude performance and proved unsuitable for the air war in Western Europe which was largely conducted at high altitudes. The P-39 was rejected by the British, but used by the U.S. in the Mediterranean and the early Pacific air war, as well as shipped to the Soviet Union in large numbers under the Lend Lease program.
The P-40, which also had only the single-stage, single-speed-supercharged V-1710, had similar problems with high-altitude performance.
The P-38 was the only fighter to make it into combat during World War II with turbo-supercharged V-1710s. The operating conditions of the Western European air war – flying for long hours in intensely cold weather at 30,000 feet (9,100 m) – revealed several problems with these engines. These had a poor manifold fuel-air distribution and poor temperature regulation of the turbo-supercharger air, which resulted in frequent engine failures (detonation occurred as the result of persistent uneven fuel-air mixture across the cylinders caused by the poor manifold design). Specially formulated fuels were a necessity for the P-38 as were specific spark plugs needed for specific cylinders. The turbo-supercharger had additional problems with getting stuck in the freezing air in either high or low boost mode; the high boost mode could cause detonation in the engine, while the low boost mode would be manifested as power loss in one engine, resulting in sudden fishtailing in flight.
These problems were aggravated by sub-optimal engine management techniques taught to many pilots during the first part of WWII, including a cruise setting that ran the engine at high RPM and low manifold pressure with a rich mixture. These settings can contribute to over-cooling of the engine, fuel condensation problems, accelerated mechanical wear, and the likelihood of components binding or "freezing up. Details of the failure patterns were described in a report by General Doolittle to General Spatz in January 1944. In March 1944, the first Allison engines appearing over Berlin belonged to a group of P-38Hs of 55th Fighter Group, engine troubles contributing to a reduction of the force to half strength over the target. It was too late to correct these problems in the production lines of Allison or GE, and as the numbers of Merlin-engined P-51 Mustangs based in England mounted up through the end of 1943 and into 1944, the P-38s were steadily withdrawn from Europe until October 1944 when they were no longer used for bomber escort duty with the Eighth Air Force. A few P-38s would remain in the European theater as the F-5 for photo reconnaissance.
The P-38 had fewer engine failures in the Pacific Theater, where operating techniques were better developed (such as those recommended by Charles Lindbergh during his development work in the theater) and the Japanese did not operate at such high altitudes. Using the same P-38Gs which were proving difficult to maintain in England, Pacific-based pilots were able to use the aircraft to good advantage including, in April 1943, Operation Vengeance, the interception and downing of the Japanese bomber carrying Admiral Isoroku Yamamoto. New P-38 models with ever-increasing power from more advanced Allisons were eagerly accepted by Pacific air groups.
When Packard started building Merlin V-1650 engines in America in 1942, certain American fighter designs using the Allison V-1710 were changed to use the Merlin. The P-40F, a Lend Lease export to Britain, was one of the first American fighters to be converted to a Packard-Merlin engine. However, the installed engine was the V-1650-1 (a Packard-produced Merlin XX) with a slightly improved single-stage, two-speed supercharger, yielding only modest gains in performance due to the airframe's own limitations.
The last Allison powered P-51, the Mustang I(II)/P-51A, used the single-stage, single-speed Allison V-1710-81, with a 9.6:1 blower ratio. This allowed the P-51A to reach a maximum speed of 415 mph (668 km/h; 361 kn) at 10,400 ft (3,200 m) and maintain 400 mph (640 km/h; 350 kn) at 23,000 ft (7,000 m). This was more than 70 mph (110 km/h; 61 kn) faster than the Merlin 45-powered Spitfire V at 10,000 ft (3,000 m), and more than 30 mph (48 km/h; 26 kn) faster at 25,000 ft (7,600 m). Its speed impressed the British, and the RAF quickly realized the airplane would possess excellent high altitude performance if the Allison V-1710 engine were replaced by the 60-Series Merlin. A similar proposal to cure the P-38's problems by replacing its Allisons with Merlins was quashed by the USAAF, after protests from Allison.
Starting with the V-1710-45 around 1943 (after the P-51 had been fitted with a Merlin 61 by Rolls Royce), Allison attached an auxiliary supercharger to some of its engines in an effort to improve high-altitude performance. The two-stage supercharged Allison was essentially developed as an "add on" to the single-stage engine, and required minimal changes to the base engine. While it lacked the refinement, compactness and after-cooler of the two-stage Merlin, the Allison used a pressure-altitude governed variable-speed first stage. Various configurations of this auxiliary supercharger were used in production versions of the V-1710 that powered aircraft such as the Bell P-63 and North American P-82E/F/G series. In addition, it was tried or studied as the powerplant for many experimental and test aircraft such as the Curtiss XP-55 Ascender, North American XP-51J "lightweight Mustang", Boeing XB-38 Flying Fortress, and Republic XP-47A (AP-10), both of the latter with turbo-superchargers.
The V-1710-powered F-82 did not arrive in time for World War II, but did see brief action in the Korean War, although the type was completely withdrawn from Korea by the end of 1950. It had a short service life that was probably due to a combination of factors: poor reliability from the G-series V-1710 engines, low numbers of F-82s produced, and the arrival of jet fighters. The initial production P-82B had Merlin engines, but North American was forced to use the Allison V-1710 for the E/F/G models when Packard stopped production of the Merlin engine.
In total, 69,305 V-1710s were built by Allison during the war, all in Indianapolis, Indiana.
The V-1710's useful life continued, as thousands were available on the surplus market. In the 1950s, many drag racers and land speed racers, attracted by its reliability and good power output, adopted the V-1710; Art Arfons and brother Walt in particular used one, in Green Monster. It proved unsuccessful as a drag racing engine, being unable to accelerate rapidly, but "could taxi all day at 150". Unlimited hydroplane racing also became a big sport across the U.S. at this time and V-1710s were often tuned for racing at up to 3,200 hp (2,400 kW)—power levels that were beyond design criteria and significantly reduced durability.
Later, as purpose-built V8 engines became available for drag racing and unlimited boats shifted to turboshaft power, tractor pullers began using the Allison engine, again developing unimagined power. Finally, the warbird movement began to restore and return to the air examples of the classic fighters of the war and many V-1710-powered pursuit airplanes began to fly again, with freshly overhauled engines. The reliability, maintainability, and availability of the engine has led others to use it to power flying examples of aircraft whose original engines are unobtainable. This includes newly manufactured Russian Yak-3 and Yak-9 airplanes, originally powered by Klimov V-12s in World War II and the two (so far) airworthy examples of the Ilyushin Il-2, taking the place of the Mikulin V-12 it originally used, as well as ambitious projects such as a replica Douglas World Cruiser and Focke-Wulf Fw 190D by Flug Werk of Germany.
Allison's internal model designation for the V-1710 started with the letter A and proceeded to the letter H. Each letter designated a family of engines that shared major components, but differed in specific design details. Each of these designs were identified by a number, starting with number 1. The last letter, which was introduced when both right hand turning and left hand turning engines were built, identified by the letter R or L respectively.
The military model numbers were identified by a "dash number" following the engine description "V-1710". The USAAC/USAAF models were the odd numbers, starting with "-1" and the USN models were the even numbers, starting with "-2".
"A" series engines were early development engines for the USN and USAAC. The first military model was a single V-1710-2, which was first sold to the USN on June 26, 1930. The "A" engines had no counterweights on the crankshaft, 5.75:1 compression ratio, 2:1 internal spur gear-type reduction gearboxes, 8.77:1 supercharger ratio, 9.5 in (240 mm) impeller, SAE #50 propeller shaft, a float-type carburetor, and produced 1,070 hp (800 kW) at 2800 rpm on 92 octane gasoline.
"B" series engines were designed for USN airships. The military model was V-1710-4. They differed from the "A" series engines in that they did not have a supercharger, had two float-type down-draft carburetors were mounted directly to the intake manifold, an SAE #40 propeller shaft, and could be brought from full power to stop and back to full power in the opposite rotation in less than 8 seconds. They produced 600–690 hp (450–510 kW) at 2400 rpm.
"C" series engines were developed for highly streamlined pursuit aircraft for the USAAC, and are easily identified by the long reduction gear case. The military models were V-1710-3, -5, -7, -11. -13, -15, -19, -21, -23, -33, producing between 750–1,050 hp (560–780 kW) at 2600 rpm. These engines came in two groups, one group rated at full power at sea level, the other rated at full power at high altitude. The altitude rating difference was in the supercharger gear ratio, four of which were used: 6.23:1, 6.75:1, 8.0:1 and 8.77:1. These engines received heavier crankcases, a stronger crankshaft, SAE #50 propeller shaft, and Bendix pressure carburetors.
"D" series engines were designed for pusher applications using propeller-speed extension shafts and remote thrust bearings mounted to the airframe. The military models were V-1710-9, -13, -23, and -41, producing 1,000–1,250 hp (750–930 kW) at 2600 rpm. Supercharger ratios were 6.23:1, 8.0:1 or 8.77:1, depending on altitude rating. These engines had the compression ratio increased to 6.65:1. Marvel MC-12 fuel injection, which was unsatisfactory and quickly replaced by a float-type carburetor on -9 and -13 models. Later dash number engines used Bendix pressure carburetors. These engines were being designed at the same time as the V-3420 engine, and shared many assemblies as they were developed. The "D" series engines were the last of the "early" V-1710 engines.
"F" series engines were designed for late model pursuit aircraft, and are identified by the compact external spur gear-type reduction gearbox. Military models were V-1710-27, -29, -39, -45, -49, -51, -53, -55, -57, -61, -75, -77, -81, -87, -89, -91, -95, -99, -101, -105, -107, -111, -113, -115, -119, producing 1,150–1,425 hp (858–1,063 kW) at 3000 rpm. The V-1710-101, -119 and -121 models has an auxiliary supercharger, some with a liquid-cooled aftercooler. Supercharger gear ratios were: 6.44:1, 7.48:1, 8.10:1, 8.80:1 and 9.60:1 depending on altitude rating. These engines had either a six or twelve weight crankshaft, revised vibration dampeners that combined to allow higher engine speeds, SAE #50 propeller shaft, and higher horsepower ratings. The "E" series and "F" series engines were very similar, the primary difference being the front crankcase cover, which was interchangeable between the two series engines.
"H" series engines were to use a two-stage supercharger driven by a two-stage air-cooled power recovery turbine. The engine was to have an aftercooler and port-type fuel injection. This variant, however, was never built.
- Bell FM-1 Airacuda
- Bell FL Airabonita
- Bell P-39 Airacobra
- Bell P-63 Kingcobra
- Boeing XB-38 Flying Fortress
- Curtiss P-40 Warhawk
- Curtiss-Wright XP-55 Ascender
- Curtiss XP-60A
- Curtiss P-37
- Douglas XB-42 Mixmaster
- Douglas DC-8
- Lockheed P-38 Lightning
- North American A-36 Apache
- North American F-82 Twin Mustang
- North American P-51 Mustang
- T29 Heavy Tank (trial)
Saturday, July 11, 2020
Worthington, Ohio---With great regret, the National Tractor Pullers Association herein announces the cancellation of the 2020 running of the Enderle Memorial Pull-Off.
The event had been planned for Saturday, September 19 in Urbana, Ohio. A statewide moratorium in Ohio on spectator-attended, isolated motorsports events made it impossible to include fans in the festivities at the Champaign County Fairgrounds.
"That was a deal-breaker for Kent and Joan's son, Mike Keena," said Gregg Randall, NTPA's General Manager. "Mike made it clear that the Enderle isn't the Enderle without fans in the stands cheering on their heroes, and we wholeheartedly agree."
"We want everyone to stay safe and hang in there," Randall concluded. "We'll hope for a better year next year, and the Enderle will be our season finale like always."
For further information, check here: https://allstarpull.com/
or, check here: https://www.facebook.com/enderlepulloff/
Friday, July 10, 2020
Serious concerns expressed by the Mercer County Health Department about the staging of large public gatherings in their rural community have prompted the Ambassador Club to cancel the 2020 Fort Recovery NTPA Grand Nationals.
The event had been planned for Friday and Saturday, July 31-August 1 and will not be rescheduled this year. Though the Fort had lost sessions due to weather over its five prior decades, 2020 will mark the first time since 1971 that no NTPA competitors will gather at Ambassador Park.
"There really was no path forward for our friends at Fort Recovery this year," began Gregg Randall, the Association's General Manager. "As I've said so many times, we must look past our deep disappointment and heartache for a nearly lost 2020 and think about the future. There's just too much risk involved in flouting the guidelines of local officials who can shut you down this year and/or put up obstacles to holding an event next year."
"No promoter wants to be a bad corporate citizen or an unwelcome presence in their hometown," Randall said. "Competition will return next season to the shadow of the Victory Monument, and the Fort's pulling history will continue."
Tentative dates for the 2021 Fort Recovery NTPA Grand Nationals are July 30-31.
The following is the text of the Ambassador Club's release to Facebook on Thursday, July 9.
The Fort Recovery Ambassador Club regrets to announce that they are cancelling the NTPA Tractor Pulls scheduled for July 31-August 1.
A lot of effort was put in by many to make the event a success but multiple factors ultimately made it impossible including the current mass gathering ban issued by the Ohio Department of Health and the safety and well being of everyone.
We appreciate the support and understanding by all in making this decision.
For further information, check here: https://www.fortpull.com/
or, check here: https://www.facebook.com/Fort-Recovery-Ambassador-Park-212218211032/
Monday, July 06, 2020
Saturday, July 04, 2020
Thursday, July 02, 2020
PPL Champions Tour Mound City, MO (USA) June 27, 2020:
PPL Silver Series Mound City, MO (USA) June 26, 2020: https://propulling.com/events/results#/results/2020-06-26/3/0/599
PPL Silver Series Mound City, MO (USA) June 27, 2020: https://propulling.com/events/results#/results/2020-06-27/3/0/600
PPL Western Series Mound City, MO (USA) June 26, 2020: https://propulling.com/events/results#/results/2020-06-26/4/0/599
PPL Western Series Mound City, MO (USA) June 27, 2020: https://propulling.com/events/results#/results/2020-06-27/4/0/600
Nebraska Bush Pullers Mound City, MO (USA) June 26, 2020: https://www.nebraskabushpullers.com/2020-results.html
Nebraska Bush Pullers Mound City, MO (USA) June 27, 2020: https://www.nebraskabushpullers.com/2020-results.html
OTTPA Warrensburg, MO (USA) June 20, 2020: https://outlawpulling.com/wp-content/uploads/2020/06/Warrensburg-MO-1.pdf
OTTPA Whitewright, TX (USA) June 26, 2020: https://outlawpulling.com/wp-content/uploads/2020/06/Whitewright-TX-1.pdf
OTTPA Whitewright, TX (USA) June 27, 2020: https://outlawpulling.com/wp-content/uploads/2020/06/Whitewright-TX-2.pdf