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charset=utf-8 Content-Transfer-Encoding: quoted-printable Neil, With a -6 drain line to the crankcase, air that was initially inside the gea= rbox is mixed with the oil and this mixture is forced out the drain by an eq= ual volume of pure oil coming in. Eventually all the air is eliminated and t= he gearbox is completely filled with oil. An RD (Tracy Crook) redrive fitte= d with a -10 (5/8=E2=80=9D) id drain and a vent from the upper part of the r= edrive to the upper part of the crankcase will not fill up with oil and only= have crankcase pressure inside. Steve Boese=20 > On Apr 29, 2021, at 4:25 PM, flyrotary@lancaironline.net wrote: >=20 > =EF=BB=BF > =E2=97=86 This message was sent from a non-UWYO address. Please exercise c= aution when clicking links or opening attachments from external sources. >=20 > Mat, > Oil into the redrive is needed mainly for lubrication and a= lso heat transfer. Very little is needed as lubrication needs little with o= ils these days. It appears that In most cases the redrive actually fills an= d does not drain readily. Why I do not know. This puts pressure on the sea= ls back and front, which suggests it may be beneficial to hold both seals in= with small screws to prevent them getting pushed out. Screws are good insu= rance as in flight a detached seal could ruin a good day. > Neil. > =20 --Apple-Mail-D0A7D7BF-18D4-4495-A85B-161487737451 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Neil,

With a -6 drain line to th= e crankcase, air that was initially inside the gearbox is mixed with the oi= l and this mixture is forced out the drain by an equal volume of pure oil c= oming in.  Eventually all the air is eliminated and the gearbox is com= pletely filled with oil.  An RD (Tracy Crook) redrive fitted with a -1= 0 (5/8=E2=80=9D) id drain and a vent from the upper part of the redrive to = the upper part of the crankcase will not fill up with oil and only have cra= nkcase pressure inside.

Steve Boese 

On Apr 29, 2021, at 4:25 PM, flyr= otary@lancaironline.net wrote:

=EF=BB=BF

=E2=97=86 This message= was sent from a non-UWYO address. Please exercise caution when clicking li= nks or opening attachments from external sources.


Mat,

     &= nbsp;          Oil into the re= drive is needed mainly for lubrication and also heat transfer.  Very l= ittle is needed as lubrication needs little with oils these days.  It = appears that In most cases the redrive actually fills and does not drain readily.  Why I do not know.  This puts= pressure on the seals back and front, which suggests it may be beneficial = to hold both seals in with small screws to prevent them getting pushed out.=   Screws are good insurance as in flight a detached seal could ruin a good day.

Neil.

 

= --Apple-Mail-D0A7D7BF-18D4-4495-A85B-161487737451--