Take the 2-minute tour ×
Science Fiction & Fantasy Stack Exchange is a question and answer site for science fiction and fantasy enthusiasts. It's 100% free, no registration required.

In Return of the Jedi:

Artoo butts the golden droid over the edge and steps off himself, tumbling toward the sand.

But in Attack of the Clones:

ARTOO uses his rocket jets to fly up and into the factory.

Why didn't R2-D2 use his jets in RotJ instead of ending feet up in the sand?

Update: I am looking for an in-universe explanation.

share|improve this question
4  
All the answers seem focused on explaining why R2 may not have been ABLE to use the rockets. Maybe he simply didn't see a need. It was the end of the battle, he was getting himself and 3PO out of the way to be picked up (with no expectation of further use until after pickup) and knew 3PO would land in a likely helpless position as well. So... Why waste fuel in order to be right-side-up when picked up? Is vertical that important to a magnetic hoist? –  Scivitri Oct 5 '11 at 22:27
4  
Uh, how about the Jawas in A New Hope removed them to make R2 more marketable as a service droid? –  user11946 Jan 15 '13 at 3:03
add comment

8 Answers 8

up vote 42 down vote accepted

This obviously looks like a afterthought explanation but here is what I found :

The magazine, Star Wars Insider Issue 62, explains that R2's manufacturers at Industrial Automation had limited their factory warranty on astromech rockets to about 20 years, which would explain why R2 doesn't have his rockets in the Original Trilogy.
generalanswers.org

I was dubbing on that reference because I don't have any copy of Star Wars Insider Issue 62. I also fond the same text in a cached wikipedia page and that section has been removed long ago. (see wikipedia Talk on R2-D2)

Anyway, from the Industrial Automaton wookieepedia article there's a remark on this limitation of the warranty that cite holonetnews as reference :

RORDIS CITY, NUBIA - Rescinding previous consumer documentation that guaranteed a "lifetime" of reliability in their after-market astromech hover rockets, Industrial Automaton has now capped the warranty at 20 standard years. This decision affects all optional R2, R3 and R4-adapted leg-bracket and barrel-housed propellant rocket systems.[...]

share|improve this answer
6  
I kinda think this is not a real good answer, I know its cannon but .... if Han can keep the Falcon fling why not tell Luke (or have Chewie ) how to fix the rockets? –  Vaughn Sep 2 '11 at 16:28
3  
How could you doubt of a canon explanation? Heresy!!!! –  DavRob60 Sep 2 '11 at 16:45
2  
Do Luke or Chewie even know R2 units have friggin' rockets? –  Pureferret Jan 3 '12 at 12:40
3  
"afterthought explanation" is better known as ret-conning –  Jarrod Roberson Feb 29 '12 at 19:13
3  
@Vaughn - Han had to have enough information in his brain on all the cobbled together pieces of the Falcon. Between that, sabbac moves, and pick up lines there was little room left for actual maintenance knowledge. –  Chad Mar 26 '12 at 18:26
show 5 more comments

Another possible reason could be that the rockets (even if they had fuel) weren't powerful enough to lift R2-D2 in the gravitational field ot Tattooine (which, being a rather large planet, is likely to have relatively high gravity).

If In remember Attack of the Clones correctly that scene took place on an asteroid or planetoid, thus in low gravity.

Rockets powerful enough to lift an R2-D2 in 1G (1 Earth gravity acceleration) - and it's quite likely Tattooine had higher than that - would be rather large and bulky. Thrusters for (near) zero gravity to propel the same mass can be a lot smaller and thus easier to fit into a droid.

As the R2-D2 was designed for use in zero gravity primarilly (space ship maintenance and repair, etc...) the designers aren't likely to have designed it with atmospheric flight in a high-G environment in mind.

share|improve this answer
    
agreed, and I alluded to that in one of my comments, above. Nice one. –  Wikis Mar 9 '11 at 7:44
6  
There's no observable evidence for either Tatooine or Geonosis having gravity far from 1G - people seem to fall at the same rate, thrown and flying objects have 'normal' looking trajectories, etc. If they were off from 1G, it wasn't by much. –  Jeff Mar 11 '11 at 19:57
1  
rather hard to film a high-G environment on earth, slowing down some actions while speeding up others at the same time, especially without the computer resources now available to movie studios (resources ILM didn't have when filming the original SW movies). –  jwenting May 26 '11 at 12:36
add comment

It's probable that, as his focus shifted away from starship maintenance (with its requirement for zero-g mobility) and toward 'Rebel hacker/awesomebot' R2 was modified to remove the rockets.

It's also possible that, as a member of the rebellion against the government of the time (instead of as a robot in the service of the present government, as in the prequel trilogy) the fuel was hard to come by. R2 can't have a lot of storage space for fuel, and I'd be willing to bet that his flight capabilities either require a significant amount of his internal power OR need a separate fuel source. If it is fuel, then it's certainly likely that he had none at the time - either because the Rebellion didn't think it would be needed or because it had been removed by Jabba's people (why would a drink server need it?).

Keep in mind that there IS evidence for R2 having flight capabilities in Empire Strikes Back (unless you think the bottom of a lake in a SWAMP is a good environment for a wheeled robot, and that it would be level enough for his sensor probe to maintain a flat path).

share|improve this answer
add comment

Among the plausible reasons:

  1. because the small repulsorlift engines in R2 might not work over "off the cliff" surface (either not enough power, or problems with control).

  2. It was a faster way down :)

I don't know of a canonical answer.

share|improve this answer
2  
+1 for the "faster way down" –  jclozano Dec 30 '11 at 17:16
add comment

Since I first watched Revenge of the Sith, I thought a direct answer to this question was given when R2 spits out a full load of petroleum-like fluid and uses his thrusters to ignite it and fry a bunch of battle droids on Dooku's flagship. It is even clear that he used all his fuel for this, because the thrusters cough and turn off right after. Why he never refills can be explained in various ways. Maybe the tank was not refillable as that fuel quantity was intended to last for decades. Or that particular fuel was never available again after the fall of the Republic.

share|improve this answer
add comment

Perhaps, in the RotJ secne, they were disabled or removed despite the fact that R2 had a restraining bolt. The foreman robot in Jabba's palace recognized R2 as being a troublemaker and could have accounted for him being wily enough to try to circumvent the restraining bolt at some point. Furthermore, I would imagine that they would be a limited use item as R2 did not use them for a very extended period on Geonosis.

share|improve this answer
add comment

He didn't fly because there was no need he was going to get picked up by the magnet anyways so it made no difference if he was in the sand or on top of it.

share|improve this answer
    
Wrong from in-universe. HE didn't know that in advance –  DVK Nov 12 '13 at 22:07
add comment

According to Wookieepedia:

R2-D2, during the Clone Wars, utilized a Brooks Propulsion rocket booster, which he used to escape and, in the case of the Battle of Coruscant, offensively. After the Clone Wars, however, Brooks Propulsion Devices, the company responsible for the development of his boosters, was shut down, and his rocket boosters were eventually damaged and thus could not be repaired. Despite this, however, R2 hardly regretted the loss of his ability to fly.

share|improve this answer
    
Wiki answers are pretty worthless unless they can be backed up with an original source. –  Richard Jun 9 at 18:32
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.