Is there any particular reason why there is no lock washer under the prop nut? A few times I have had it come loose...not in the air yet. I put a lock washer under it today because to me it just seems insane not to have one there. On a real aircraft you never install hardware without some locking feature. I was just wondering if there was some reason that I am not aware of that they don't come with one. I know that even if it comes off in the air you can still glide the aircraft in and land it but seems like it would be preferred that it not come off at all. If there is some reason for not using one, I will remove the one I put on.