MisakaMikoto_

21/10/17 Wetmore's P51D-10 engine power error

Hi,

Wetmore belongs to the 359FG. I found a copy of the 359FG dated July 1, 1944, which states that the brigade began to carry out a 100/150 fuel modification.

359th-150grade-1jul44.jpg

 

According to the 8AF report, the P51 intake pressure using 100/150 fuel should be WEP 72IN MIL 61IN.

http://www.wwiiaircraftperformance.org/150grade/dir-supply-5feb45.pdf

 

 

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Hi.

 

Your report does mention a transition in mid 44 and a wider use in early 45.

 

Wetmore's got his P-51D possibly in this time range, but it doesn't mean that his plane was immediately running at 72 or 75" HG.

 

More importantly, 150 octane works perfectly fine with a 67" boost.

A city car can run with 92, 95 and 98 fuel. Same apply for a plane: high octane doesn't legitimate a higher engine MP setting.

 

For instance, your PDF, point 6) (3) mentioned that the airplane needs modification to run higher boost, in addition to the high octane

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2 hours ago, Rapitor said:

Hi.

 

Your report does mention a transition in mid 44 and a wider use in early 45.

 

Wetmore's got his P-51D possibly in this time range, but it doesn't mean that his plane was immediately running at 72 or 75" HG.

 

More importantly, 150 octane works perfectly fine with a 67" boost.

A city car can run with 92, 95 and 98 fuel. Same apply for a plane: high octane doesn't legitimate a higher engine MP setting.

 

For instance, your PDF, point 6) (3) mentioned that the airplane needs modification to run higher boost, in addition to the high octane

 

Quote

In late Winter of 1943-44 the Allied Expeditionary Air Force (A.E.A.F.) decided, pending further trials, not to employ 150 Grade Fuel for Overlord due to spark plug issues, however, it was intended that 150 Grade would be used when proved satisfactory. Meanwhile, cross channel operations by two squadrons of P-47’s and one P-38 using 150 Grade fuel revealed an increase of speed and climb characteristics at the expense of spark plug difficulties. The Production Division was directed on 28 March 1944, under the authority of the Commmanding General, Army Air Forces, to modify all P-38, P-47 and P-51 airplanes in the United Kingdom for the use of Grade 150 fuel, with the necessary modification kits to be shipped to the European Theater of Operations within 30 days.

 

Quote

Successful service tests led in May 1944 to the Eighth Air Force Fighter Command requesting that it "be supplied immediately with grade 150 aviation fuel for use in P-47, P-51 and P-38 planes". Deliveries of Grade 100/150 aviation fuel to AAF Stations commenced within a week of the landings in France. The change over to 150 grade fuel necessitated the resetting of all aneroid switches on the P-51s.

 

Quote

A decision was made in May 1944 to have all fighter units supplied with this fuel no later than 1 June. As of that date operations with this fuel continued until approximately 1 February 1945 when all fighter units switched to “Pep” (100/150 plus 1.5 T’s ethylene dibromide). As of 1 April 1945 all units switched back to 100/150 fuel containing 1.0 T ethylene dibromide.

 

http://www.wwiiaircraftperformance.org/150grade/150-grade-fuel.html

 

Furthermore, Wetmore achieved more than half his kills after the switch to 150 octane fuel: https://en.wikipedia.org/wiki/Ray_Shuey_Wetmore

 

Yeah, it's Wikipedia, but the article does cite sources of its own.

 

E: That said, we do know Wetmore's Mustang was among the last 100 planes produced from the 800 plane batch of D-10s: 

 

http://www.mustangsmustangs.com/p-51/production

http://www.millionmonkeytheater.com/P-51Dfirst.html

 

P-51D-10-NA s/n 44-14733*1944-45: USAAF 370th FS (359th FG) as CS-L. 

 

9b0c312dbdc6778d7e3f6e08039429c3.jpg

 

As such it is almost certain it ran on increased boost concurrent with 150 octane fuel for most of its service life.

Edited by PainGod85
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That's enough to justify the use of 150 to me.

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I did not forget you, I just have some high workload IRL.

 

Report will be processed when possible

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On 15.10.2017 at 2:17 PM, EvgeniyPetrosyan said:

So, when report will be processed?

 

 

On 04.10.2017 at 10:09 PM, Rapitor said:

when possible

I have real life activities, and they are also time consuming.

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Your Bug Report is submitted.

 

This thread will remain unlocked for 7 days in order to allow anyone with information / evidence / examples to post them.

It will also serve as a place where the developers may post questions for you to answer, so please keep up to date here.

 

Thank you for helping us improving the game.

 

Sincerely,

Rapitor, for the ™ team

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