JW, thanks to your recommendation, I bought six, it's yours. 😉 Then again, mine were $9 and change each, right dimensions... from the link you gave me, did the price go up? I'lll pass one on to Art in case I can't make it to MHM... though Hell hasn't frozen over yet.

Addendum: Checked the site, mine aren't forged, closed, yes, forged no, and that explains the price difference... drat! Still yours though. Have I said "though" enough?

Checked the site again, mine are stainless steel... couldn't find the forged, stainless steel isn't bad. 8)

Awesome, Bruce - many thanks. Those things are wonderful, I use them on all my rockets anymore. I just don't have enough to equip two large rockets... I have them in 1/4", 5/16", and 3/8". BTW, the cool kids use titanium http://www.bosunsupplies.com/products2.cfm?product=T0571 😯

What do you mean "if you don't make it to MHM"????????

I'm just using stainless - I have 4 in 1/2", 4 in 1/4"... I'll be adding 3/8" when I start my 4" MD project. Bosun Supply is great and the prices beat the hell out of McMaster-Carr.

Warren

Bosun Supply is great and the prices beat the hell out of McMaster-Carr.

I'm not sure how you figure that Warren. Price on these items is

Bosun 3/8"
$20.13 rated at 1160 pound
McMaster 3/8"
$21.70 rated at 1800 pound

Bosun 1/2"
$30.56 rated at 2150 pound
McMaster 1/2"
$35.38 rated at 3600 pound

Sure you could save a few dollars but that's hardly what I would call the prices "beat the hell" out of McMaster, especially when you look at the load ratings.

Doug

I just bought four 1/2" stainless, non-forged eye-nuts with a 2000# WLL for $10.33 each. Based on the load rating, I'd say that beats the price of the nearest McMaster equivalent by quite a bit.

http://www.bosunsupplies.com/products2.cfm?product=S0321

W

I buy my eyenuts from CD Fasteners in Fort Collins. I think when I bought some 3/8" ones they were $6 apiece. I'm betting most of the time the harness fails before the eyenut.

Edward

I'm betting most of the time the harness fails before the eyenut.

Edward

I concur. Another area that I have had issues with is when I use a Kodson / AMW casing and I anchor directly into the fwd closure. My rocket "Argos" apparently experience a bit too much opening shock one time, and the upper end of the casing got a bit disfigured. The snap ring did not fail, but I had to chop the casing back. That really surprised me.

At the end of the day, as you say - the harness (and probably the chute) would seem to be the weaker links.

Love those eyenuts.........

JW, I put two aside for you. I'll be at MHM, just maybe not Friday--when the cool kids fly. Don't know how my schedule will be then.

Just so most know I have a pretty extensive amount of hardware pieces like these forged eye nuts and eye bolts I keep around. If ever any of you need some please feel free to give me a shout.

I have a pretty extensive amount of hardware pieces like these forged eye nuts and eye bolts I keep around.

And, they're good quality! I should ask this elsewhre, but how do you keep forward closures from unscrewing after main deploy with closed, forged eyebots? Duct tape? I know, that most reloads of highest power (M and above) put tension on the threads--at least, in my limited experience, and that's what I'm counting on. Though my next flight will use a Cesaroni reload (M1400) in an AT motor casing (75/6400). Uneasy about that, 'cause I've never tried it. Any suggestions, or words of caution?

Bruce, your question is why I don't use eyebolts or eyenuts. It is possible for them to un-thread especially if one section of the rocket like the fin can is rolling. I bolt the motor in with a bolt to a plate but then use a U-bolt to actually anchor the recovery harness to. Some use a lock washer or lockwire to prevent the eyenut from backing off but I just avoid the whole situation and use U-bolts. I hope this helps.

Doug

Thanks, Doug. I'm using U-bolts on my next rocket, for no other reason than I trust them to work. 😉 You need any MBA's with an English degree who's always loved, studied, and lived science down there in NM? 😉

I'll send you a PM.

Doug

Doug, I would have to disagree. Ive never seen this be an issue. UNLESS the flyer didn't prep it right, But thats not a failure of the method but a failure in doing it right. ALMOST every flight ive flown in 38/54/75/98mm sized motors has used nothing but eyebolt in the forward closure of the motor case to tie the harness to on the booster end. I wont tie my harness to anything but. I use a good nut underneath the eyebolt to lock it in place it NEVER goes anywhere. Thats better then 100 flights and never a problem. To each his own. But I cant see an issue if its done right. I know guys with lots of experience Like JW and James and Tony A and I could list more that do it the same way. Some of them have pushed well past the 30K mark. Yet never an issue. I cant say ive seen any data to support it as a problem. Again unless its users error.. But i see that happen on all sorts of stuff. Be it electronics, motor building, ect....