Velocity 755V, with its 3-rotor 20B powerplant, has completed 40.2 hours of
flight, and is now released from Phase 1 operating limitations.
No need to clutter the list with congratulatory messages. I appreciate all
the information that has come from this group, and the positive feelings out
there that go with the achievement of this milestone.
Al
Great Al. You would not be planning on going to OSH would you?
Paul Lamar ...No rotor no motor.
---------------
No; not this year. Still have some issues to address - oil temps are
running a bit high in the warm weather; some strange behaviors still with
the EC2; and the RD-1B oil seal in the drive mounting plate has developed
some leakage.
Al
Old message Al. Paul
-----------------------------------------------------------------------------
-------- Original Message --------
Subject: Ross modifications
Date: Fri, 01 Jun 2001 09:38:51 -0700
> > "Bass, Jerry" wrote:
> > >
> > > No pictures with this copy, but I saw them on another. The input (sun)
> shaft
> > > looks shorter too. Our units are about 14 inches from engine flange to
> the
> > > prop hub face.
> > ..... SNIP
>
> > > Everyone complains about blowing the rear seal. And no one complains
> about
> > > the front near the prop hub. Logic says the pressure behind the sun
> gear
> > > towards the back seal gets higher than we expect. I added a drain from
> the
> > > back side of the bell housing near the seal to the pan. this should get
> oil
> > > flow.
> > >
> > > Jerry Bass
> > >
> Jerry,
>
> I had the problem of oil leaks past the rear seal on my 2.17:1 Ross
> drive. Finally got tired of coming back with oil covering bottom of aircraft
> and canopy. I tried everything from smaller oil flow restrictors (getting
> down to 0.025" dia which is too small for good cooling of gears) to
> rerouting the drain line dump into the oil sump, to an expensive custom made
> High Performance Oil seal - all with no success in stopping the leak. I
> finally drilled a 1/8" dia hole into the top of the gear box case right next
> to where it bolts to the bell housing. I installed a fitting, hooked up a
> clear hose and ran it into a bottle. I observed that anytime engine was
> above 5000 rpm that oil would flow out this opening = about 10% to the total
> oil flow to the gear box. So I hooked a hose to this vent and vented it
> back to the oil sump and have had no problem with any oil leaks since. And I
> have since gone back to a 0.040" dia oil restrictor to get more oil flow
> into the gear box. I certainly don't understand what pressure mechanism
> causes it to want to flow out the top of the gear box near the rear seal,
> but this fix worked for me and was simple to do. I made a point not to
> drill into the area where the planetary spokes were.
>
> Ed Anderson
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