The Hubologists need plans for a Vertibird from Navarro is a quest in Fallout 2.
ESS Quetzel is being readied for the flight to Quetzel, however, Harry the Rocketman is not sure about the aerodynamics of the shuttle. To resolve the problem, he needs a copy of the Vertibird plans from Navarro.
The quest is available after joining the Hubologists at either the NCR or by talking to AHS-7. Harry will reveal that he needs the plans from Navarro for aerodynamic reference.
The plans are located at Navarro, inside the locker in the Vertibird maintenance hangar. The stealthy way is to infiltrate the base by convincing Chris the gas station attendant that the player is part of the reinforcements, then acquire a suit of advanced power armor from the armory underground, and find the hangar.
Raul, the Vertibird mechanic, will direct the player to Quincy, the head mechanic. After talking to Quincy and mentioning the need for the plans, Quincy will direct the player to collect the plans from the locker.
The plans have to be delivered to Harry to complete the quest. Turning them in to Matthew at the Brotherhood bunker in Chinatown will give a 20 000 experience reward, however, and will not remove the plans from inventory as they simply copy them. The same is not true for the Shi. In fact, if the player already completed the quest to get the plans for the Shi, they will need to steal the Vertibird plans from the Shi.