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HelicopterMain Discussion › Applying ATF to OWB
12-15-2015 05:22 PM  23 months agoPost 1
rudyy

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E. Amherst, NY

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So what is the right way to apply ATF to OWB? Should I just add a few drops to the inner wall or should I just fully submerge the whole OWB into a pool of ATF? Also, what agent can I use to clean the OWB before applying ATF? Alcohol or acetone?

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12-15-2015 06:51 PM  23 months agoPost 2
fastflyer20

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N. Tonawanda, NY

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Alcohol (90%, not 70%) and compressed air work fine for cleaning. Flush it a few times.

I use a few drops of ATF, more is not necessary and can contaminate clutchs on fuel powered heli's.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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12-15-2015 08:34 PM  23 months agoPost 3
jharkin

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Holliston, MA - USA

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Tom,

Interestingly I had an email discussion on this topic with Josef Schreiner (new owner of MA). He told me he spoke to the folks at GMN Bearings about this, and they tell him the sprag bearings are designed to be run in a fully submerged oil bath. They believe the failure rates are partially due to under oiling, which of course we have to do in the whiplash due to clutch contamination you mentioned.

Hence he is moving the whiplash bearing back to the mainshaft so it can safely be run fully oiled.

My takeaway from this is fill it with as much oil as you can if contamination of other parts is not a concern.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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12-15-2015 10:19 PM  23 months agoPost 4
fastflyer20

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N. Tonawanda, NY

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Agree an oil bath is preferred in many mechanical designs but often not possible. On a heli it just flings out if too much is used due to lack of sealing. MA issue was mainly RPM related. If properly designed, and many heli's are not, you can fly with little to no attention to the OWB. Good design requires correct RPM and sizing, proper support on both sides of OWB, proper clearances and lube. In industry, I have seen OWB's last decades with zero maintenance to the bearing.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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12-15-2015 10:29 PM  23 months agoPost 5
Heli 770

rrProfessor

USA.

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I use an aerosol can of brake cleaner, cleans and dries fast.

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12-16-2015 01:25 AM  23 months agoPost 6
Four Stroker

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Atlanta

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"proper support on both sides of OWB"

There you go. Hence the Align 600N failures. Have over a 1000 flights on an old Kalt Mercury 50 with a single 10 mm ID one way roller clutch - not a sprag.

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HelicopterMain Discussion › Applying ATF to OWB
12-16-2015 01:46 PM  23 months ago •• Post 7 ••
jharkin

rrApprentice

Holliston, MA - USA

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MA issue was mainly RPM related. If properly designed, and many heli's are not, you can fly with little to no attention to the OWB. Good design requires correct RPM and sizing, proper support on both sides of OWB, proper clearances and lube.
Agreed on that. Once Rhodes pointed me to the spec sheets at GMN it was pretty obvious that the sprag MA picked was way under-rated. I still don't understand how they didn't notice that when selecting the bearing.

Looking at a lot of designs out there I wouldn't be surprised if very few heli companies actually have degreed engineers on the design staff. (spoken as an armchair ME who hasn't practiced professionally in years)

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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