Getting 'square' root edges on balsa fins?

[Tom]

Got any tips or pointers on how to get a nice straight and square root edge on balsa fins?

Seems like mine always end up kind of rounded from stem to stern.

I use a sanding block, also have tried putting the sandpaper on the table and sand on that.

Short of using a table sander that is

 

[lakeroadster]

Fixturing is the key. You need a perpendicular surface in which to place the fin in relation to the sandpaper.

You can build your own with some scrap pieces of lumber or, as you eluded to, buy a small bench sander..... which if you do, you'll wonder how you ever lived without it.

 

[Tom]

Nice that's a good idea. Thanks for taking the time.

 

[heada]

Shooting board with a good plane.

 

[Tom]

What is a shooting board?

 

[heada]

https://en.m.wikipedia.org/wiki/Shooting_board

 

[lakeroadster]

What is a shooting board?

I've learned a 737 isn't a good plane... And I've learned an ironing board makes a great shooting board. All from the internet, so it must be true.

That all sounds really pricey though.

 

[David Schwantz]

Place wood on table, use table edge as guide for sanding block. Works great for bevels also.