Carbon Fiber Pushrod Ends
10-11-2009, 08:36 AM
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Carbon Fiber Pushrod Ends
Hi there, I was wondering if anyone has used the CF pushrod ends from [link=http://www.connectorsRC.com]ConnectorsRC.com[/link]? They seem quite a bit cheaper than central hobbies and they're the capture type so they protect the Carbon from splitting at the ends??
Thanks for your help.
Thanks for your help.
10-11-2009, 09:41 AM
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RE: Carbon Fiber Pushrod Ends
Take a good look at the section where the threads and piece that goes over the push rod meet. If there is no radius, or the last thread runs right up to the larger section, be carefull. I have had three ( NOT Connectors RC brand) that were machined like that break off right at the last thread. Fortunately when bumped on the ground, not in the air. I am partial to the Central Hobbies style with an aluminum sleeve over the push rod to prevent splitting. No failures, Ever!
$5,000 to $10,000 airplane, $20 C.H. pushrod set, less than 1/2% of aircraft cost. That's not all that expensive.
If you do use the Connectors RC type, I would be interested in what you think of them.
Doug
$5,000 to $10,000 airplane, $20 C.H. pushrod set, less than 1/2% of aircraft cost. That's not all that expensive.
If you do use the Connectors RC type, I would be interested in what you think of them.
Doug
10-11-2009, 09:57 AM
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RE: Carbon Fiber Pushrod Ends
Doug. your right. My intentions were to endorse Central Hobbies ends not the other. Anytime you have a radius at the thread junture thats what you want and nothing else. I Rec some with a Yak 54 last year that were good for nothing but fishing sinkers. I don't think they were made out of stock even as good as 1018 which is on the bottom for our intent. I have made these in a pinch and pickup only 1144 type stock from my stock pile. I also blue them with gun bluing as I do with all the WW1 plane fittings and rigging.
10-11-2009, 10:28 AM
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RE: Carbon Fiber Pushrod Ends
Take a good look at the section where the threads and piece that goes over the push rod meet. If there is no radius, or the last thread runs right up to the larger section, be carefull. I have had three ( NOT Connectors RC brand) that were machined like that break off right at the last thread.
I don't think they were made out of stock even as good as 1018 which is on the bottom for our intent. I have made these in a pinch and pickup only 1144 type stock from my stock pile. I also blue them with gun bluing as I do with all the WW1 plane fittings and rigging.
10-12-2009, 08:12 AM
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RE: Carbon Fiber Pushrod Ends
Exactly.
Notice where the threaded portion is turned down just before the taper between the threads and body section and the sharp (not radiused) transition from thread to body.
303 S.S. is fine, it's just the machining I would be concerned with.
I forgot to ask, what are you going to use them on?
Doug
Notice where the threaded portion is turned down just before the taper between the threads and body section and the sharp (not radiused) transition from thread to body.
303 S.S. is fine, it's just the machining I would be concerned with.
I forgot to ask, what are you going to use them on?
Doug
10-12-2009, 08:18 PM
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RE: Carbon Fiber Pushrod Ends
As Doug stated, 303 is good for the size of these parts intent. 303 has a little more carbon than say 304 or 316 which has almost none if any. Thats why the higher the grade number the less corrosive it is. The radius and metal used is where your strength is. Also, keep the threaded portion as short as you can and cut off the excess after you have sized your length. You are better off with your carbon rod a little longer and the threads shorter.
