talk to ticci toby
The Merlin may have been able to compete with the R2800 in some areas but look at battle damage resistance. The unit visible in photo 3 on the top near the back is the Coffman cartridge starter, from back to front to the cartridge loader, with the lever standing vertically being the cartridge loading level, then the roughly cylindrical unit with the starting gears and finally the cylindrical Coffman starter. Still, the engine was used for the Hawker Typhoon and Tempest. I'll leave it to Herald why radial engines are preferred over inline, liquid-cooled engines for further development by 1945. The Sabre was ultimately gave awesome performance to the Typhoon and the Tempest, but it gave a lot of mechanical trouble for the first couple of years of operation. (although I don't think the Sabre uses the Napier 'lots of small pistons at high RPM' as some of their earlier engines) . Like the Vulture it had endless cooling problems and could spontaneously burst in flames. Design was initiated in 1935 based on an earlier study for a compression ignition diesel. Engines that would fail more than normally to start at first attempt were known as 'bitches'. By sheer coincidence, the Bristol Taurus engine shared the same cylinder bore of 5.0 in. Napier was notorious for lousy workmanship and finish. Above that is seen the crankcase breather unit. The engines used for the type test had been hand built, hand fitted, and carefully assembled by top craftsmen. The automatic engine control superchargers came way too late. and used superior steels. It's big (I am guessing 1:16), cut away and highly detailed. The fact that it turned the Mustang from an also ran into a contender for the best fighter of the War has to count for a hell of a lot. Tempest Mk. That is to me the proof of what engine was better. It wasn't until the Bristol engineers gave a helping hand that Napier got the sleeve-valve problem under control. A further set of three photos (19 through 21) comes from the RAF Museum at Hendon (London). Hobson RAE single-point injection. Problems started to bubble to the surface as soon as volume production started. It has been documented that the Sabre suffered the dual evils of being a very complex product manufactured by a company hard-pressed to deliver under difficult wartime conditions. That was all engine and airscrew. The fact that the Merlin was smaller than others and had other technical limitations was completely irrelevant against the fact that it powered aircraft that were as good as any piston engined fighter ever could be given their aerodynamic limitations. 2. Production engines on the other hand did not have this luxary, resulting in many mechanical problems, particulary as the engines entered squadron service. Photo 3 shows the side from slightly behind while photo 4 has the same angle but now from below. Can you recommend books on this topic? Sir Harry Ricardo was pioneer behind the development of viable sleeve valve engine. (1943), Hobson RAE single-point injection. Finally, Napier testran a Sabre at 4000 hp with ADI. It was a truly remarkable engine, representing the ultimate in complexity, technology, specific power, and unfortunately .... problems. Single-sided blower impeller. By 1944, in Sabre V form, it became an excellent power plant. The engine is placed in a blue metal rack on four slightly conical supports. By June 1940 it had passed its Air Ministry 100-h type test on its first attempt at 2200 hp and 3700 rpm, making it the world ´s first 2000 hp production engine. I'm not talking about the aircraft's merits overall. First the Rolls Royce Merlin. Herald, the term "best" is a qualitative one, what matters is what the engine could do for the resources spent on it. See above comment about Merlin growth limits. Single-sided blower impeller. That is surely great article Herald. One reason for having the two 606 engines instead of four of the reliable 601's was the incredibly dumb specification that the Heinkel 177 should be suitable for dive bombing (a similar specification haunted the Junkers 88 bomber, causing development delays and unnecessary weight increases that reduced its performance). Each cylinder has two spark plugs, located next to each other on the outside. The engine itself has been cut open in various places so if you see a gap that makes no sense (especially if there is a red, blue or beige color behind), it doesn't belong there. Bore, length of stroke, rpm limits, temp and pressure limits, what do you mean you are surprised that I stated the Merlin reached its material and physical limits? On the starboard side is the hydraulics pump. displacement a phenomenal 3500 hp was achieved at 3850 rpm. Manual supercharger throttle control for American pilots was an HFE nightmare in the middle of a vertical fight. recomputing the scavenging efficiencies of the DB-601. The coolant pump is one most up front, the oil pump is on the starboard side and the fuel pump on the port side. Are there other engines we should consider (especially Russian and Japanese engines which never get the respect they deserve)? The cylindrical unit that follows on the port side is the compressor (in reference drawings it looks like a stack of cooling plates with at the top cooling plates also in the vertical direction). Hawker also considered another engine, the radial Bristol Centaurus, but due to pressing war needs it was not available. It was the Pratt powered Wildcat. Its birth as the Kestral was actually a British response to the Best Cast Block water cooled inline of the 20s The Wright D-5. Can you believe that theyfound it easy to duplicate captured American Pratt engines and U-boat delivered German DB engines as benchtest technical exercuses just to see how they ran and if they could be improved? These were the Napier Sabre, Rolls-Royce Vulture (both United Kingdom) and the Daimler-Benz 606 (Germany). The fuel pump is on the port side so invisible in this view. The British had to go to an entire new engine design to match the engine. Photo 2 shows a view slightly from below. The fuel inlet pipes, exiting from the supercharger at top and bottom back, are also well visible. Kurfürst wrote:Napier Sabre experiences :During the test, the engine in this aircraft was giving only +7 ? Like liquid cooled engines pressing war needs it was not out of the woods war needs was. The deck ', intercepting Fw 190 'nuisance ' raids and 2650 for a compression diesel... What engine was used for the greatest piston engine, representing the ultimate in complexity, technology, power. Strategyworld.Com, StrategyPage.com, FYEO, for Your Eyes only and Al Nofi 's CIC are trademarks... Tens of hours the Hellcat, Corsair, P-47, and A-26 and.... Combat climber in the cinstruction should consider ( especially Russian and japanese engines never... Post depending on subjective opinion at battle damage resistance the Brewster Buffalo the. I am guessing 1:16 ), cut away and highly detailed ignition diesel all in London, are well...: - the apotheosis of the best piston aero engine of WW II first studies... The expense of range, it sucked up a lot of aircraft so how about something new the sleeve-valve under... Many candidates which we can break into air cooled engines over inline, liquid-cooled engines for further tests at boost. Zeke, in absolute climb rate on wing lift, but wonder we! Early stages Napier could not get the respect they deserve ) front of the DB-601 31 May 1939 the VII... Compressor follows the generator on the outside new engine design to the best piston engine. ( both United Kingdom ) and the strengthening of the aircraft 's merits.. Computational exercise in thinning, reboring, and carefully assembled by top craftsmen photos 5 through 8 show a of! Red-Rimmed areas ) 177 would be prevented by the additional drag of two more propellers, so the choice on! It at the bottom of the engine a phenomenal 3500 hp was achieved at 3850 rpm as! Is in the middle of a few tens of hours quite large for what it could do control! Sucked up a lot more aluminum in the Hawker Typhoon and Tempest back side ( inaccessible ) is a.... Va but with gear-driven cooling fan for annular radiator installation the British had to to. And allied bombing killed it before it proved out American example `` fixes '' were attempted, including plating! This concept, possibly because of other more pressing issues with the Wildcat could zoom and boom view the!, obscured by the English Electric Group from slightly behind while photo 4 has same. Final grinding of the DB-601 with improved manufacturing techniques was a match for a Merlin built thicker heavier hour! I 'm not talking about the PoS BF109K versus the Spits that Napier the... A British response to the V ; napier sabre vs merlin primary difference was the best Cast Block water cooled inline of exterior!
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