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<\/a>This is my first attempt on the prop for the Cessna.\u00a0 Don provided the design for the fixture to set 15″ pitch.\u00a0 Note the bracket at the hub to hold the prop spar (1\/16″ dowel).\u00a0 Also, this initial prop used an aluminum hub whereas the second Cessna prop used a one-piece spar.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Everyone knows about Plastic Props.\u00a0 Many people know about carved wood props.\u00a0 There is another type of prop that you can make that is a) light weight and b) effective.\u00a0 I call these “Can Props” because they are formed on … Continue reading <\/a>For this new prop, I laid out the prop design on a plastic cup.\u00a0 This is 18 degrees off vertical.\u00a0 This cup is my Template – I take a second cup and slip it over this and trace the pattern on the second cup.\u00a0 In that way, I do not have to continually lay out the design on a cup.<\/p>\n<\/a>I use these cups from Walmart.\u00a0 They are small.\u00a0 This bag of 80 cups cost about $4.<\/p>\n<\/a>Here is a single blade set up in a new fixture that was based on the old fixture but was designed for a fatter aluminum tube hub.\u00a0 The hub was drilled for 1\/32″ wire and that wire slips into a vertical tube to positively prevent rotation.\u00a0 More in the next photo.<\/p>\n<\/a>This is the back side of the same blade.\u00a0 I used standard round toothpick as the primary spar.\u00a0 Rather than cut the blade to fit the spar, I sanded a flat on the spar and glued it to the blade.\u00a0 This method necessitated a tubing hub as shown.\u00a0 The blade was very flexible, so I added a 1\/32″x1\/16″ stiffener to the back side of the blade.\u00a0 I sanded it thinner.\u00a0 The toothpick spar is being glued into the aluminum tubing with Canopy Glue.<\/p>\n<\/a>Gluing to the cup\/blade is nearly impossible, but Loctite makes a product that primes the plastic.\u00a0 There is science behind this, but I won’t attempt to explain it – just know that this works.\u00a0 The “Activator” is the key – I am pretty sure the glue is just CA.\u00a0 Without this glue, I couldn’t glue the toothpick or the stiffener to the blade.<\/p>\n<\/a>The finished prop comes in under 1 gram.\u00a0 By the way, that is just flat black Design Master sprayed on the blades.\u00a0 I haven’t yet tried this prop on any plane, but am confident that it will work for indoor models.\u00a0 I anticipate having to match rubber to the prop and maybe trimming some of the prop away.<\/p>\n