I saw it but that kind of like when my wife tells me she told me something. I hear her even though I'm not listening. In the case, I saw it but didn't read it.
From a quick skim I'd say it's a pretty good writeup on BP Motor issues. Nothing personal - I don't use BP Motors.
Actually, I posted my reply to David E-W's post where he said: "Tell me more!
David Erbas-White "
In response to Bob Kaplow's comment:
"Some BP motors were born bad. Some got bad as they aged, even without being temperature cycled (the Estes E15s). But there are also ways of treating temperature cycled motors so that they will work OK! "
My "Tell me more" was about the comment of "treating temperature cycled motors so that they will work OK!", not about how the temperature cycling makes them bad in the first place...
I did read it, and understand it fully. I think we're having a misunderstanding over the word 'treat'.
I was using the word in the sense of "a method to restore the motor to its original condition", and you were using the word in the sense of "a method to allow the motor to be used in some circumstances so that it won't CATO." I was inferring from Bob's post that he had some 'treatment' that could be applied to a motor to 'heal' the BP fracture
-- and couldn't imagine what it might be. I'm very familiar with what you've written, but the way Bob worded his statement it appeared that there was something new to learn.
If he had phrased it as "there's a way to HANDLE temperature cycled motors so that they'll work OK" instead of "there's a way to TREAT temperature cycled motors so that they'll work OK", I wouldn't have jumped the gun like that.
I thought it might be something like what is done to dehumidify ICs, or something similar -- you know bake in a very low temperature oven for 24 hours, etc.
And especially does not mean return to "original condition". A treatment for a gunshot wound does not remove the wound, only limits consequential damage and does some work to minimize the scar and tissue damage.
Also since when is a post subjected to such close scrutiny when it is a contemporaneous authorship with no review committee.
And a gaggle of whiners and personal attackers and virtual stalkers, does not a review committee make.
The key parameter is the delta between max temperature they've been exposed to, and the internal temp when fired. So firing them in the cold also causes catos.
But take a cycled motor, warm it back to its max temperature, and fire it while warm, and it will probably work OK. I can't recall who did the R&D report (late 70s?) but someone actually did this and it works.
Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!
The fact that I chose to skim a few lines, decided I wasn't interesting in reading it and moved on means I can't read or comprehend? Anyone that draws that conclusion certainly is 'Special.'
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