I have lost one of the washers that are used with the nut on IRIS's blades. Would it be safe to fly without this washer? If not, does anyone know what I could buy to replace it?
Hardware stores will have the washer, it is a very common one. I wouldn't fly the IRIS without it. Take one of the washers to the store, a decent employee will find a match.
I have done so it the past but I do not think it is a good idea. Prop was loose after flight of about 5 min. You should be able to find a replacement at just about any decent hardware store. Take one with you so you can compare and obtain the proper size. I bought a dozen at Lowe's.
I wouldn't do it. Send an email to email@example.com. We'll send you a new set.
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I replaced nuts and washers with nuts that have the washer attached (like this):
I bought them at ACE Hardware and and had some good success so far.
In addition it does not hurt to add some removable threadlock such as LOCTITE® THREADLOCKER BLUE 242