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PM sent. From the P-47 pics, it looks like the BB TP (2S) 325s will fit. Might hang below the fuselage just a bit but should be an excellent batt in her. Roger |
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AG,
My dad flew Jugs in the war. And I had the honor of meeting many of his squadron-mates at a 345th Devilhawks reunion. I know exactly what a Jug could & couldn't do in combat tune. Even in factory tune, later Jugs that had the 13 foot paddle-bladed prop could easily out-climb a Bf-109 or FW 190. 2800 HP? That's just the published number. The Jug's special version of the R-2800 was factory-tested @ 3800 HP & 150" of manifold pressure for 100 hours non-stop!! That's 190% of the original R-2800's rated military power for over 4 DAYS straight at a staggering 59 POUNDS of boost!! All thanks to an engineer named Frank Walker - the inventor of water-injection. This is a must-read for any warbird or hot-rod buff. I think it's one of the best hot-rodding stories of all-time. The story of Frank Walker & his development of the Jug's legendary engine: http://www.enginehistory.org/Frank%20WalkerWeb1.pdf Joel |
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Last edited by turboparker; Aug 27, 2015 at 08:11 PM.
Reason: Typo
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I'm starting to think Joel is really into Jugs.
Cheers! Rocket |
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Yep!
Now we just need to get HH to make all their micros this size with brushless motors and 2S-3S power. I'll take an Apache, a B-25, a B-29, and a P-51B (I'm sick of the D model). And while they're at it, how about a P-40 with some power (unlike that last UMX version)? |
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So, are you going to get one? Quote:
Joel |
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Last edited by turboparker; Aug 27, 2015 at 08:31 PM.
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Maybe we have the newer micros, and then the older "ultra" micros at a cheaper price for beginners. |
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Hey everyone,
I just got a reply from Seth regarding the Jug's airfoil. Good news. Now for the bad news. Seth is no longer with Horizon: Quote:
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WHAAAT !!!!
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Using a manometer (mercury) it comes out to closer to 75 pounds. Using a hydrometer we're talking less than 5 pounds. 50" of mercury is about 25lbs boost, which is very high even for modern racing engines (only legal for rally, off road, etc.) made with modern alloys and with massive intercoolers. During WW2 the average MTBR (mean time before refit) was around 50 hours for most Allied and Axis plane engines. During the Battle of Britain it was not unusual to send in fighters with "clapped out engines" during dire circumstances. For the Soviets aces, over-speeding the engines for 30 hours meant the Mean Time Before Rookie (pilot). As such, there was a very low requirement for maintenance and the entire system was far more efficient for the political officers (accountants), using the lend lease act. Cheers! Rocket |
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Rocket,
150 in Hg of manifold pressure (referenced to a vacuum (which is what aircraft manifold pressure gauges read) = 59 pounds of boost as referenced to atmospheric pressure (which is how boost is usually measured in automotive engines). So Frank's R-2800 was running 6 pounds less boost than a modern 10,000 HP Top Fuel dragster engine. (But his R-2800 was running on 130 octane avgas - not nitro-methane - which is one of the main reasons why the specific output was so much lower.) The later version of the R-2800 was way ahead of its time. It is still regarded as one of the very best-engineered, most reliable engines in history. Many of its features can be found in today's racing engines. Read the article I posted & you'll see that Frank routinely ran his R-2800 at extremely high boost levels during his 'horsepower race' with the R-4360 guys. He often ran it at those power-levels for 100 hours nonstop. And he never blew an engine in his entire career at P&W! FYI - I am intimately familiar with boosted engines. My daily-driver is factory supercharged. It's running 8 pounds of boost on 93 octane unleaded. My weekend toy is the factory turbocharged & intercooled '87 Buick Grand National. I added water-injection - just like the Jug has - along with a few other goodies that allow it to breathe a lot better. Factory boost was 15 pounds - referenced to atmospheric pressure. I've got the wastegate set for 23 pounds of boost on 100 octane unleaded. When I engage the WEP, it shoves you deeper & deeper into the seat as the speed builds up & keeps you there until you chicken-out & back off the throttle. I chickened-out at 163 MPH. Joel |
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Last edited by turboparker; Aug 27, 2015 at 11:41 PM.
Reason: Typo
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As exciting as the news is about this and other fantastic new releases this year, it's really sad that HH is losing so many great and talented people. Don't know what's happening, and they are likely unable (or too much gentlemen) to say. But it's definitely sad. They've become like family and will be very much missed.
Seth, if you're watching this thread, "Thank you!...and hope all goes well for you in an exciting new venture!" Tom |
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