Question: Doc is quite a resourceful and clever guy. Why didn't he set to work on repairing the flying circuits which would have enabled them to use Mr Fusion to reach 88mph, instead of the engine?
jshy7979
12th Mar 2020
Back to the Future Part III (1990)
19th Aug 2019
Back to the Future Part III (1990)
Question: Back in 1885 why doesn't Doc change the letter he sent to Marty, asking him to bring a can of gas?
Answer: When Marty received the letter from Doc in 1955, as seen in the second movie, Doc wrote down that he didn't want Marty to go to 1885 to rescue him because he was happy living in the past. Instead, he wanted Marty to take the Delorean straight back to 1985 and then destroy it so it could never be used for personal gain again.
But once Marty appears in the past Doc could easily change the letter, changing things such that Marty would bring gas with him.
Answer: This would create a different timeline, not the timeline they are in.
Answer: That would not be possible as in 1885, Doc sent the letter on September 1st, and 1955 Doc sent Marty to 1885 on September 2nd so it was a day later and on the 1st, Doc was not expecting Marty to turn up. However, one CAN ask why Marty and Doc didn't go to the local Western Union office and change it (or write a new one) there since it was in their possession per the gentleman in part 2.
Changing the letter while Marty is in 1885 with Doc would accomplish nothing, because it doesn't it instantly travel to the future. Marty at the end of Part II, for his part, may receive the letter almost immediately, but the letter itself had to wait 70 years to be delivered to him.
I mean, there's no solid rules to time traveling, but just for argument's sake it seems like the letter idea could work... in the franchise, when something is set in motion, the effects usually take place immediately. Take for instance when George and Lorraine kissed at the dance in Part 1. The picture of Marty and his siblings went right back to normal, even though the kids had not been born yet. Doc and Marty changing the Western Union letter "could" have had an immediate effect and a gas can could have materialized in the Delorean, much like we've seen newspaper headlines change before our very eyes, disappearing gravestones, etc.
In your examples, the changes occur to future events. The items that changes, like the picture and newspaper, are from the future themselves. They can't change the past by changing events in the future (like they do in Bill and Ted's). This is why Doc and Marty couldn't go back to 2015 to stop old Biff from taking the DeLorean.
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Answer: Mr fusion only powers the flux capacitor. The engine is needed to get the car up to 88mph whether flying or not and the only way to get the car any power is by the use of petrol, which didn't exist in 1885.
The_Iceman
At the beginning of the movie, when 1955 Doc reads the letter that 1985 Doc sent to Marty, he reads that the lightning bolt activated the time circuits and at the same time destroyed the flying circuits. Because of this, the Delorean will never fly again.
These answers are correct. Plus, to the original question: as clever as Doc is, keep in mind he got the flying conversion done in 2015. Definitely no way he would have been able to repair something so futuristic with 1885 tools at his disposal. He couldn't even get gas.
jshy7979
Yet just a few years later he had built from scratch a flying time-traveling locomotive, all with 1885 tools and parts.
jimba
There's no indication he built the flying train in 1885. It's suggested he had been time traveling with his wife and kids and says he's already been to the future. Whether this is in the DeLorean or the train it's not clear, but the dialogue suggests he's been to the future in his train with the family and could have modified his train to fly with future technology.
Bishop73
That took years, as you said. They were trying to leave 1885 in a matter of days so Doc wouldn't be shot by Buford.
jshy7979