Good floats, using these under my quadcopter when I fly over water for safety reason (just in case of splash, not for water landing).
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They're not terribly pretty when all is said and done but they work great and are very stable under a 450 size, 1.7 kilo quadcopter. I did do some finish sanding on the wood to prevent chafing on the floats and you do have to drill holes for the cross bars which requires some thought or you wont get the floats on without some creativity. Lift offs from water are a bit tricky so be careful on your first few tries. The best part is that they can be aired down for transport and take up practically no space. Lighter than my fg "tall" landing skid from ebay! I think you could replace the aluminum cross bars with 8mm fg or cf tube and some tarot style rubber undercarriage mounts and save a good bit of weight but I havent tried it yet. I may have some cf plates cut to replace the plywood as well and see if I can shave a few more grams off. It would also be a good idea to add a layer of vinyl to the bottoms to prevent punctures. Worth every penny including shipping to the states though!