Ok, I need:
-A script that makes the object invisible when you fly, and visible when you're not.
-A turbine engine particle effect script that turns on when you fly and off when you're not.
-A script that makes the object rotate and change to another texture when flying and stop rotating and change back to the previous texture when not.
These may be simple for you, but I don't know the slightest about scripting. Name your prices.