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Building Tips and technical articles. => 1/2 A building. => Topic started by: Fred Cronenwett on February 24, 2014, 11:25:12 AM
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Where is the best source to get propellers for the Cox black widow engines?
I found an APC prop in the right size but the hole size for the screw on the prop is way too big on the APC prop
Thanks,
Fred
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APC claims to have adapters available.
I machined a few from aluminum.
I've heard from folks on this group that a bit of fuel tubing works well.
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Fred, i still like the old cox 5x3 on a black widow. Available from the coxengines folks (google coxengines) for around $2.50 ea. sku# 5x30000 i believe. I don't care for the ones with safety tips. Also, for the apc props, i like to use tygon yellow fuel line for spacers.
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thanks guys....I knew that had to be a simple answer and thought about making a spacer but fuel tubing is easier to work with
Fred
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I use two pieces of brass tubing. Forgot the size but one fits the prop hole ID and the other fits the shaft OD. Cut them sightly short so that so that they don't interfere with tightening the prop.
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Contact Melvin at MBS Model Supplies. He has the props and the adaptors.
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I had some input in the design of these adapters. http://www.ebay.com/itm/APC-Prop-Bushing-for-1-2-A-Props-Brass-Propeller-Bushing-Buy-5-get-the-6th-FREE-/251462760149?pt=Radio_Control_Parts_Accessories&hash=item3a8c5 They work with the APC 5x3 and for the smaller props like the 4.2x4 you will need the plastic APC bushing and this metal one will fit inside of it. Ken
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If you are crashing still the rubber ducky Cox props are good (they are not great though). They are a lot less powerful than Master Airscrew, APC, and the rigid Cox competition props. This loss is primarily due to flex, which makes them resist breaking in grass and dirt crashes.
Phil