Dangerous Incorporated said:
In the prequels and CW Series we see R2 use his rockets which we didnt at all in the originals. Could R2 use his rockets to get into the X-Wing when Luke is on Dagobah when Luke leaves to help Leia and Han? As we saw on ANH, it seemed liked a big production to get the droids in the ship. But then in ESB there isnt anyway for him to get in.

I know this was breifly covered a few pages back but I though showing R2 boosting his way into the X-Wing and/or boosting his way out on Cloud City.

Well, even though we don't see him use those boosters, it doesn't necessarily mean that he didn't use them. Also, it is possible to say that his boosters' fuel supply was on empty at the time of the OT.

Just throwing some possible explanations out there.