Are you taking your toys too ?
This is what I was hoping for:
http://www.robinsonheli.com/manuals/r22_mm/r22_mm_9.pdf
or even:
http://science.howstuffworks.com/tra...elicopter5.htm
woops, they use ball bearings !

 

who died and left you in charge???

 

+996

 

At some point, Mssrs. Gelb and others were appointed as hall monitors for the bearing threads. Coooooooooool.

 

I almost hate to post lol for fear of being landblasted (I love the personal protectors of the site. god forbid someone tries to chime in on a subject)

But Jake suggests that oil temperature/heat is the reason for bearing failure. So I assume (?) that a lower temp thermostat would be a good idea, or perhaps an additional oil cooler to lower temps?

Perhaps the primary cause of damage should be thought about more

 

Jake's indicated in several threads is that overloading is the cause of the M96 IMS bearing failure.

You're mixing apples and oranges - or, in RL parlance, "modes of failure." A T-stat change isn't going to do boo for your IMS bearing. The low-temp t-stats are GREAT, however, at spawning arguments.

"Landblasted" = "lambasted?" Typo or wordplay? Funny either way.

Please note that my reply was landblast/lambaste free, and contains no corn syrup nor genetically modified organisms.

 

Gluten free as well ?

 

um OK. looks like youre not reading the thread youre so good at derailing

as far as GMO, funny how these things become en vogue. been going on since vegetables and fruits arrived in the supermarket, just in different ways of getting there

 

Hey now, Quotey McQuotesalot - If you're going to throw quotes around, you might as well include the very next sentence Jake wrote:

"The problem is not lubrication, and never has been. The problem is overloading of the bearing."

Cooling the oil is not going to address whether or not a bearing is overloaded.

As for GMO - people are f****g dumb, almost as stupid as the anti-vaccine crowd. Everything we eat is the product of genetic manipulation. Apparently, though, it's only evil if the genetic tinkering takes place in a lab instead of the massively inefficient method involving selective breeding over many generations...

 

if the first step is seal failure, then would the bearing remain OK?

Im not looking for anecdotal or "im an engineer" (total BS. Unless youre an engineer in a very very very similar field, why this matters is beyond me), but people like Jake and similar who do this for a living, a reasonable question would be if I can lower my oil temp, is there a reduced risk of failure?

I built an electric car. Feel free to google it. This does not make me an expert in designing an electric motor, a contactor, or anything else.

 

I stayed at a Holiday Inn Express last night. (?)

 

5chn3ll is a bright guy - particularly when discussing plant genetics.:-).It must be the inter-molecular fluorescence?
I am with you on the BS, btw.
Back to IMSB.

Which of all the issues mentioned are cause & which are consequence ?

- Indirectly - if the cause is (*insert any diagnosis from above posts), why does DOF seem to work (?) on a whimpy, generic single row bearing ?
Cop-out answer - there are not enough DOF units installed for long enough to draw that conclusion. Are we hiding behind spurious epidemiology ? Define 'enough'.
Let's suppose DOF does work as well as any other IMSB 'solution' (no failures so far according to Pedro), the basic cause was therefore inadequate lubrication ? Maybe, but perhaps the DOF was cooling the bearing. Maybe the DOF flushes contaminants,reduced thermal shear of the under-spec oil or....?
To answer this we need a M.SC. Eng helicopter expert(not me) -where'd he go?
Lots of contributors(including one Bearing Engineer & me) to these threads will be looking very silly if something a simple as DOF is the answer.

 

I tried to make this simple, and bait you to my hook, but then two alter egos re-emerged (one of which I kinda like btw...)

Such brilliant engineering minds, and people who use words like "epidemiology" to make it sound like a high-brown convo. Some of us had to take courses in that stuff, and it can get slightly loathsome.

But back to my original question.

To quite the fantastic Pedro:
theres that little word again: cooling. So if it is indeed the oil temp, would an effort to reduce this, even indirectly by a lower temp thermostat, be a somewhat prevention effort? I know Jake reads all this stuff, and would love to know how they view this, as clearly they have approached this stuff in about every imaginable way

 

High brown??? Ummm... No, I won't go there.

 

" little word again: cooling"
Actually there were several " little words" . Why select only 'cooling' ?
And all the little words are mere assertions until/unless we get test data.Which nobody has got/offered to support a specific IMSB remedy.
If we just select our favorite assertion ,it is technically meaningless. Which is fine if the lack of technical basis is admitted.
Flaps is doing us all a service by experimenting with a solution that mere assertions (thrust/heat) have dismissed. Bravo Flaps!
Just my "high brown" 2cents.