I have an Ingersoll Rand, model 315, long board air sander. It is available from Northern Tool or a lot of other sources for just over a hundred dollars. It is really a nice tool for keeping large surfaces fair when using some heavy fairing compound.
The aluminum sanding pad comes off with two bolts like this photo:
![Image](http://www.javelin38.com/images/ir315before.jpg)
I made a new base from a piece of spruce 2 x 4 to match a profile I wanted to sand. I then attached it with 2 - 1/4" x 1-1/2" carriage bolts and large fender washers to prevent the wood from distorting the slide plate. That came out like this:
![Image](http://www.javelin38.com/images/ir315after.jpg)
To attach the sandpaper, I used 3M spray Disc Adhesive.
It does an awesome job!! I am about to make some more special profiles after I make a gizmo to mount my router on the cross slide of my lathe. In the absence of that, profiles can be made by attaching a blank to the sander and gluing some sandpaper to a surface profile that you want to copy. Then run the sander with the blank attached until it matches the copy, then reverse the deal and put the sandpaper on the blank.