I'm starting this thread to post some figures on how much props weigh. While maybe it isn't incredibly important for the 50cc++ gassers, I have found that on most glow engines (and probably smaller gassers as well), the weight can actually have a significant impact on engine/plane performance, especially as it regards spooling up or down. I believe that the weight of the prop should be taken into consideration, not just it's maximum static thrust etc.

I used a reasonably accurate scale from WalMart, though someone with a nice postal scale or something similiar will obviously produce better results. I encourage whoever has a few extra minutes to go and weigh a few props and post the results here for all to see.

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Xoar 15x6 laminated wood : 52g/1.75oz.
APC 14x6 : 76g/2.75oz.
APC 15x6 : 76g/2.75oz.
APC 15x4w : 70g/2.5oz.
Master Airscrew Wood Scimitar 14x6 : 30g/1.1oz.

That's all I've got on hand.