CubsThe long answer to your queries:
There was no 100 Octane available at LAE so logically Earhart would not want to dilute this high Octane fuel used for Take-Off by completely filling the tank with lower grade fuel and as the gurus say she carried it in a 100 USG tank and it was “half-full” we can speculate a little.
There were 97 USG tanks and 102 USG tanks which fall into the “100 USG”. So we’ll stick with the 100 and say that tank carried 50USG remove that from the capacity of1151 USG and we end up with 1101 USG carried out of LAE.
However, the LAE refueller is reported to have said at the time that he topped off all tanks before she left so the Electra may have had 1151 USG on board when it taxied out.
This “may” explain why the take-off run was so long if the fuel was diluted as the Electra would not get the same performance out of say “90-ish Octane Fuel as it would out of 100 Octane. One pilot who was overhead in a Ju31 said that he could see a cloud of dust raised when the Electra hit the rise of the dirt road which was at the end of the seaward runway. I have stood on that perimeter road at LAE and it was right at the end of the available runway length on the old airport at LAE. So she used all the 3000 feet available. There then was a drop-off of about 20 feet to the level of the sea. Descriptions say the Electra descended down to sea level until it was obviously in ground effect whereupon the props left wakes in the water and was still only climbing very slowly out over the water when they lost sight of it.
So, on fuel carried, 1100 or 1151, take your pick.
Unlike the sister-ship, “The Daily Express”, which could be refueled from fuel cans which were taken aboard before flight, C/N1055 does not appear to have had this luxury available as no mention of it being capable of being refueled during flight has been mentioned.
“The Daily Express” was flown from the hard sand beach at Woodgate in Lancashire, in the U.K. to NYC by Merrill and Lambie, carrying film of the Coronation of King George VI. It flew across the North Atlantic, mainly at 5,000 feet to avoid icing and made a precautionary landing near Boston before continuing on to NYC without refueling.. Quite an achievement in itself. It landed in NYC with fuel to spare.
Lockheed Figures:
0-8000' 1 Hour using 100 USG
8000' 3 Hours at 60 USGPH
8000' 3 Hours at 51 USGPH
8000' 3 Hours at 43 USGPH
10000' Remainder of the flight at 38 USGPH.
On the Flight in March 1937 from OAKLAND to Wheeler Field on Oahu, HI; 947 USG were loaded. The Electra climbed through to 10,000 feet and remained there for all the flight until descent into Oahu. At one point the Groundspeed was 180 mph. The flight was going so well that Earhart realized they would be arriving in the dark so she slowed the Electra down by pulling back the power until as she says in her book: “Last Flight”, “….we are at 10,000 feet, indicated speed 120 mph, I am using less than 20 USG of gas”. The book indicates that she reduced power at the 14 hour point in a near 16 hour flight. The 120mph must have been “Corrected Indicated Airspeed”.
From the Lockheed figures, you can see then that they would expect the Electra to use 714 USG in that 14 hours.
We now have to work backwards from the known fuel load planned for the Luke Field to HOWLAND flight over 1900 Statute Miles which was 900 USG.
Paul Mantz bought 590 USG of hi-Octane fuel from the USAAC at Luke Field to make up the load to 900 USG. Therefore, there must have been 310 USG in the Electra when it landed at Luke.
Mantz had flown his Fiancee around the island after leaving Wheeler Field so let us say he would use 50 USG for that flight, in which case the Electra left Wheeler with 360 USG on board.
On arriving from OAK, the previous day fuelling had commenced but was stopped by Mantz because sediment showed up in the chamois filters when the Contractor tried to refuel the Electra. Let us say that a total of 40 USG went in through the filters before fuelling was stopped. That means that the Electra landed at Wheeler Field with 320 USG on board after the flight of near 16 hours.
If we add to that the 40 USG which would have been used in the last two hours of that flight according to Earhart’s own words on Page 37 of her book, then at the 14 Hour point, the Electra had 360 USG left, meaning it used 587 USG in the 14 Hours of Climb and Cruise. That is an average consumption of 42 USGPH when by the Lockheed figures it should have used 714 USG for an average consumption of 51 USGPH, quite a saving.
What I am trying to show here is that by Earhart’s “practical use” of the Electra, the fuel figures are better, there is less consumption in the way that she operated the aircraft.
There is also a planned flight as evidenced by Clarence Williams’ strip map for DAKAR-ADEN across Africa which is a distance of 4302 Statute Miles in a time of 28 Hours and 40 Minutes. Why Flight Plan it if the Electra cannot do it ? That time in Lockheed consumption figures means 1267 USG had to be carried but we know that only 1151 USG could be carried so how ? Well the time figure is in still air at 150 mph G/S so Earhart was obviously banking on a tailwind and my calculations show that she could do it even on the Lockheed figures if she did have 10 mph at the back. In the event she did not do this flight because of headwinds but did the distance in stages.
If we look at the HNL-HOW proposed flight over 1900 Sm and only 900 USG loaded, it tells us that Earhart cut down the required fuel to get to the “remote” island because as we have seen she would only require some 525 USG for the 12.5 Hours of flight (she always Flight Planned at 150mph G/S and adjusted for wind), leaving another 375 USG, for what ? She obviously had a contingency if she could not find Howland and that was to continue on to The Gilberts 600 miles further on. This means that 2500 Statute Miles was possible on 900 USG.
Looking at the LAE-HOW flight and her flight plan time into a 12 mph wind would work out to 18.5 Hours, then she needs on average 777 USG for that 18.5 hours but this flight turns out longer than the planned 18.5 hours as she called at 1912 GMT “Must be on you…etc” so she did consider that she was “at” or “lateral to” HOW at that point but the extra time would be taken up with the descent because we didn’t count that into the 18.5 hours.
The extended time of the flight could have been done at reduced speed also because Kelly Johnson’s advice was for Earhart to “lean off” ie; slow down slightly in the face of an increasing wind so less fuel than 777 USG would be the result. The Flight Manual for the Lockheed 10A I have has an amendment page inserted which is in “Courier” font which was not invented pre-WWII and therefore would not have been seen by Earhart and the amendment tells Pilots to “speed up” into an increasing headwind, not to “slow down”.
An MS Excel programme I made up for the early part of the flight LAE to the ONTARIO, where we do have a handle on times, locations and therefore distances flown has me “increasing” the headwind on the Electra in order to have it arriving at the Ontario at 1036GMT, six minutes after the 1030GMT call, “Ship in sight ahead…” There is evidence that the Flight was conducted by way of Choiseul Island to avoid the reported storm to the S-E of New Britain Island because the 0518GMT Lat/Long position heard by Harry Balfour in LAE and recorded by him is erroneous and the Longitude is incorrect. The dogleg adds only 37 Sm and is logical if one wishes to avoid a Tropical Storm. The distance from LAE-NUKUMAU then becomes 910 Sm and they were in the vicinity at 0718GMT and Earhart had reported a wind there at 7000 feet of 25 mph. Another 405 Sm sees them at the USCG Ontario and in order to get them overhead at 1036GMT, I have to wind up the headwind to a value of 35 mph. On the surface, the ONTARIO recorded a wind of 20 Knots at the time when Earhart would be going over.
So the wind value had obviously increased and that is why they were late.
I only state 20 USGPH as a setting if they use that setting in a return and to guarantee endurance.
My working shows them being 200 Statute Miles “short of” Howland. They searched for an hour, didn’t find anything and from what we have in the jungle, they did a turnback onto their reciprocal to invoke their Contingency Plan and head back to the Gilberts. As Earhart “thought” she was at or lateral to HOW, she would not expect to see The Gilberts for four hours.
We have Fred Goerner’s report of the Radio Call only heard by Nauru Island “Land in sight ahead” which can be shown to have been made at 2200 GMT, one and three quarters of an hour after the supposed last call at 2014GMT. If she had a contingency plan, she also had to have “contingency fuel” and it is my contention that this level is set at 300 USG and she turned back at that figure. In four hours she will use about 180USG climbing up to altitude again but if she sees ‘Land in sight ahead’ after 1 ¾ hours she will only use about 70 USG.
This then is “Big Decision” time. Put it down on an Atoll or “press on” to get closer to civilization.
Ocean Island is ahead, Nauru Island is ahead, Nukumanu Island is ahead and all can be easily reached on 230 USG. Why put it down now ? If we climb higher, pull the power back to a CIAS of 120 mph we can endure for 11 hours. If we now have a tailwind of 20-25 mph our Groundspeed will be 140-145 mph in 11 hours we can go 1540 to 1595 Statute Miles. Rabaul is 1580 Miles away, it has two airstrips.
At 0825GMT, 0831GMT, 0843GMT and 0854GMT on 3rd July 1937, Nauru Radio heard unintelligible calls on 6210Kcs and the Nauru Operator said it sounded like the same voice he had heard the night before but there was no hum of plane in the background.
In April 1945, an Australian Army patrol found an all-metal, twin-engined aircraft in the Jungle which carried no Nationality markings but which had Pratt & Whitney engines.
In 1993 a map used by this patrol and kept by a member of the same Company of the same Unit for 48 years turns up which has writing on the edge which says: “600H/P S3H1 C/N1055”.
Regards,
David Billings
Last edited by
David Billings on Sat Dec 18, 2010 12:55 am, edited 1 time in total.