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Classic Wings Magazine Luftwaffe Resource Center WWII Naval Aviation Research Pacific


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PostPosted: Sun Sep 24, 2017 2:17 am 
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Steve and Voodoo arriving to the Reno just days after breaking the world speed record.
https://www.youtube.com/watch?v=gUhVbQYds4o

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PostPosted: Sun Sep 24, 2017 3:17 am 
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Cool video, thanks for sharing that with all of us!

Okay, I have to ask, as I know everybody wants to know the answer, but are you going to upload the cockpit footage from Voodoo's Gold Race on Sunday? TIA!


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PostPosted: Sun Sep 24, 2017 5:49 am 
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Cool :) Does anyone know what the problem with the engine was on the record last run?

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PostPosted: Sun Sep 24, 2017 7:29 am 
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Fouga23 wrote:
Cool :) Does anyone know what the problem with the engine was on the record last run?

Steve-o was losing oil pressure right after the third run. Because of that he had to make his turnaround earlier than normal as it was a race to get in the 4th run before the engine let loose and quit. The record attempt required 4 runs through the gate, each time in opposite directions. If he hadn't turned early, there was the chance that the record would not be set due to engine failure/seizure and the whole effort would have been for naught.


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PostPosted: Sun Sep 24, 2017 1:26 pm 
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Thanks!

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PostPosted: Sun Sep 24, 2017 1:47 pm 
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Anyone who knows which power settings were used and output achieved?


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PostPosted: Sun Sep 24, 2017 3:58 pm 
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Christer wrote:
Anyone who knows which power settings were used and output achieved?


Reportedly, for the record attempt, Steve-O used full throttle and prop the whole time. I've heard that it is in excess of 160" MP and approx. 3100-3200 rpm. The output was just short of 4000 h.p.


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PostPosted: Sun Sep 24, 2017 4:13 pm 
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Well done as always Jason, thank you...

Lynn


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PostPosted: Mon Sep 25, 2017 3:35 am 
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OD/NG wrote:
Reportedly, for the record attempt, Steve-O used full throttle and prop the whole time. I've heard that it is in excess of 160" MP and approx. 3100-3200 rpm. The output was just short of 4000 h.p.


Thanks for the data ... :) ... !

If I recall correctly, "wartime" max settings for a Merlin is 3000 rpm and 25 lb/in^2 boost. 25 lb/in^2 boost converts to some 80" MP, right? That makes 160" MP quite impressive.


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PostPosted: Mon Sep 25, 2017 4:21 am 
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Christer wrote:
OD/NG wrote:
Reportedly, for the record attempt, Steve-O used full throttle and prop the whole time. I've heard that it is in excess of 160" MP and approx. 3100-3200 rpm. The output was just short of 4000 h.p.


Thanks for the data ... :) ... !

If I recall correctly, "wartime" max settings for a Merlin is 3000 rpm and 25 lb/in^2 boost. 25 lb/in^2 boost converts to some 80" MP, right? That makes 160" MP quite impressive.

"Wartime" max settings for a Mustang Merlin engine are 67" MP and 3000 rpm. Remember though, that this engine bears little resemblance to a stock wartime Merlin. It has been extensively modified with parts from other engines, including Allison connecting rods, which are much more beefier than Merlin connecting rods. There are a lot of modifications which allow a much higher BMEP, and consequently a higher MP and HP than a stock Merlin.

BTW, I don't know about conversion of MP into boost, so I have no idea about your numbers.


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PostPosted: Mon Sep 25, 2017 5:08 am 
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OD/NG wrote:
BTW, I don't know about conversion of MP into boost, so I have no idea about your numbers.


My line of thought is that boost is in addition to atmospheric pressure (14.7 lb/in^2 or 29.92 inHg)
25 lb/in^2 boost + 14.7 = 39.7 lb/in^2 MP
14.7 lb/in^2 converts to 29.92 inHg giving 39.7 lb/in^2 MP = 80.8 inHg MP

The other way around for 67" MP
67 - 29.92 = 37.1 inHg boost = 18.2 lb/in^2 boost

Aircraft Engines Of The World by Paul Wilkinson is my source for the conversion numbers.

Spitfire the History by Morgan/Shacklady states for the Mk IX and Merlin 66, 18 lb/in^2 boost on 130 grade fuel and 25 lb/in^2 boost on 150 grade fuel.

As you point out, this racing engine has little in common with a stock Merlin but still impressive!


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PostPosted: Thu Sep 28, 2017 4:19 am 
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Thanks everyone!!
Too answer the question, yes I'm putting together the gold race video now and will add the cockpit footage to it as well. About the engine power output during the record run (and Reno), on top of the other engine mods, they also use 160 octane race fuel that has additives put in as well to boost the octane even higher!!
Jason

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PostPosted: Thu Sep 28, 2017 8:08 pm 
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OD/NG wrote:
"Wartime" max settings for a Mustang Merlin engine are 67" MP and 3000 rpm.


That is correct only early on, with the standard 100/130 octane fuel, but later in the war, beginning in the summer of 1944, with British-produced 100/150 octane fuel available, Merlin-engined Mustangs were cleared for even higher power settings than that. With 100/130 octane fuel, the V-1650-7 was only cleared for 61" MP max power and 67" MP WEP. When 100/150 octane fuel became available starting in June 1944, the V-1650-3/-7 was initially cleared by the VIII Fighter Command for 72" MP WEP, and later increased this to match the British, who, using the same 100/150 octane fuel, cleared their Merlin-powered Mustangs for 81" MP WEP. This is why from late P-51D-15-NA/P-51D-5-NT production onward, all P-51D's (and most K's) came from the factory with 100"-span manifold pressure gauges, replacing the earlier 75"-span gauges. Also, for this reason, when the switch in fuel came, the British replaced the manifold pressure gauges in their Mustang III's (B/C's) from the 75"-span to the British +25 lbs boost gauges - all of the British Mustang IV's and IVa's were manufactured late enough that they all already had 100"-span manifold pressure gauges from the factory and didn't need replacement gauges. Furthermore, using U.S.-produced 115/145 grade fuel, the VII Fighter Command P-51s on Iwo Jima also ran 80" MP WEP. The V-1650-9 Merlin, as installed on the P-51H, could run 90" MP WEP, on water-injection.


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PostPosted: Thu Sep 28, 2017 9:11 pm 
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jschillereff wrote:
Too answer the question, yes I'm putting together the gold race video now and will add the cockpit footage to it as well.

Jason, for the past couple of days, after work I've spent an hour or so watching videos from your YouTube channel. This means I kinda know what to expect from the in-cockpit stuff, and I'm very excited! :drink3:

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PostPosted: Fri Sep 29, 2017 2:45 am 
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JohnTerrell wrote:
Furthermore, using U.S.-produced 115/145 grade fuel, the VII Fighter Command P-51s on Iwo Jima also ran 80" MP WEP. The V-1650-9 Merlin, as installed on the P-51H, could run 90" MP WEP, on water-injection.


Interesting, I didn't know that the P-51H was equipped for water injection. Was methanol/water an alternative or "antifreeze" was never needed?


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