CTI Prol 6gxl

[MLionbergerParticipant]

There are a couple basic types of eyebolt: Wire, which has the bolt bent around in a circle and leaves a small open gap; and Forged, which has the eyebolt fabricated as one piece.

As JW said, the wire or open eyebolts are not reliable under a load, and can open up.

The forged eyebolts are load-rated, and are usually available at Ace in a plain steel or galvanized finish. If you want to get exotic, stainless steel forged eyebolts can be found, just don’t faint away when you see the prices.

[Warren B. MusselmanModerator]

For 29mm and 38mm birds, I have long used “wire” eye bolts or screws. What I do is weld the loop closed with my little tiny 125A wire-feed welder. Takes 5 seconds to do the weld, and 2 hours to clear a space, set it up, do the job and tear it down… Ya gotta love rocketry – profit is NOT the motive.

[BEAR]

I found the cast eyes on-line with a price of about $11 for a pack of 10 with a 1/4-20 thread; so I get a piece of all thread, cut it to length, clean the threads, screw it into the eye with some locktite applied, and then screw it into the top of the motor with a jam nut in there to make sure it remains tight until I am ready to take it out. Will that work?

Remember, if the women don’t find you handsome, at least they will find you handy!

[greywolves]

Hey,
That is about what I’m thinking too, Bear. The jam nut might be a little tricky though, there will be a bulkhead in the way, but I would like to think i won’t need it. That is a smoking deal you found on eyenuts!

[MLionbergerParticipant]

For 29mm and 38mm birds, I have long used “wire” eye bolts or screws. What I do is weld the loop closed with my little tiny 125A wire-feed welder. Takes 5 seconds to do the weld, and 2 hours to clear a space, set it up, do the job and tear it down… Ya gotta love rocketry – profit is NOT the motive.

Warren, you are right–for small rockets such as 29 and 38, the wire eyes will work OK. I wouldn’t use them in anything larger, though.

[SCOTT EVANS]

I think I will just stick to “using those big honkin’ eyenuts”
Besides It was JW that turn me onto them a couple years ago.
It was his post with a link.

[Steve JensenParticipant]

about just passing the Kevlar through the plug, tying it to a washer, and epoxying the whole thing in place. This would eliminate the eye bolt entirely. The only down side (assuming it would work), is that you’d have to cut a bit of Kevlar off each time to make a new connection — you can’t reuse the plugs. I think there’s enough room in the plug to do it.

Anyone try this?

[John A. WilkeParticipant]

I think I will just stick to “using those big honkin’ eyenuts”
Besides It was JW that turn me onto them a couple years ago.
It was his post with a link.

I use them all the time – but usually in bigger rockets where weight and/or space is less of an issue. I have a bucket full of them 🙂

[greywolves]

Hey guys,

So i’m still curious, do we think the plug in the motor will hold 1/2″ of 1/4-20 threaded rod?
Thanks

[BEAR]

I have no expereince with this casing, but looking at the CTI website, you are going to have a minimum of 0.60 inches of thread in the end for you to screw into. Looking at one of the other cut-aways, you probably have more than that, but there are no dimensions to give reference to and I would not rely on scaling from the drawing. So I definitely would go with at least 6/10 ths of an inch. I am surprised no one has an answer for you.

[Author]

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