1.75in 3 blade prop spinner

by odie_wan, published

1.75in 3 blade prop spinner by odie_wan May 31, 2012
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1.75in diam x 2.5in tall spinner for a Master Air Screw 6x4 3 blade prop. The base has a "fan" in the skirt to help with cooling. This was made for a Hobby King 750mm GB R3 but can be used for whatever.It's designed for a 5mm prop adapter main shaft.


Print out base and spinner. Thread the base for M2.5 x .45mm threads. Use M2.5 x 10mm or 12mm to screw it together.

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UPDATE: I revised the spinner and base for the 3 bladed, normal rotation version. Made it a bit lighter. Should be less than 13gr. Also I flew the latest version (v5/v2base) today and it works nice.(See default pic)

UPDATE: Since it seems like this is popular item, I decided to update it with other configurations. I made a 2 blade version as well as a 2 bladed counter rotating version.The base has a CR version as well. I will post a 3 blade CR version soon.

Do you know of anyone running a printed spinner on a gas engine? Your success proves the material will handle the forces and can be balanced, but I worry about heat. We are building a 134" Lancaster with 4 15cc engines and I have printed some scale spinners but have not had the chance to test whether they can take the stresses or not.

The spinner would have to get up towards 200C (392F) for you to have to worry. But there are a lot of gas motors that run plastic spinners. I think it should be fine. If the engine was set up as a pusher, that might be an issue as the hot air from the cooling fins would flow over the prop. But in a typical tractor prop arrangement, the spinner will have lots of air flowing over it. I think you should be fine. But I might be able to convince some nitro guys at my flying field to use one of my spinners just to be sure.The think I might worry about is using a starter on the spinner.

Thanks for the advice. I am waiting for a new extruder from Makerbot... I wore mine out on the Replicator 2... when I get it set up I'm going to print on for testing on a gas engine. Let me know if you have anyone test it on a glow engine.

Made some tweaks to the spinner and base. The little fan features in the base seem to be too small for the Replicator, so I made them bigger. I also thinned out the spinner and added some ventilation/lightening holes. The newest version fits together well.