I find the same thing about second stages going wild, and have only used the higher pressure on MR12 second stages to run Poseidons properly. Like you say they prefer that higher pressure for good performance. I'll scan the USD bulletin and email to you.luis wrote:I would like to get a copy of the document, just to have it. That is interesting that they published that big of a range back then.
I have run the IP of a Conshelf and a RAM above 150, but I have found that many conventional second stages will start free flowing if you get around 160 or above.
I do have two Conshelfs that are set to around 165 psi, but those are feeding Poseidon Cyklon second stages. They are great performing second stages when they have a constant IP at that level.
They do get frisky! Rarely I would find a second stage that just didn't crack as easily as I liked, and had to go up above 140. Probably a variation in second stage spring. I don't recall going even up to 150 except to use on Poseidon second stages. After a few rebuilds on Poseidon first stages, I began to prefer the simplicity of the Conshelf/MR12-type first stages. Made field repairs easy. In those cases I wasn't using a conventional octo, which would not have worked out well.Bryan wrote:Conshelf XIV Manual This is for the most current Conshelf XIV as it shows the metal 2nd stage with the adjustment port on it.
In my experience anything over 140psi is risky for most safe 2nd stages.
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