Jerry Hey wrote:

O.K.  Are there proven modifications?  Who is doing them?  Or should
I scrap the  Ross?

Jerry, it's only the 2.17 ratio Ross that needs a thrust bearing because the
other (2.86:1?) produces thrust in the opposite direction which has a thrust
bearing. The other bigger problem is the lack of oiling to the sun gear. I tried
running over 200 hp thru it and it began to eat the gears after a few hours. I
know of at least 5 others that have had severe gear wear. The only ones that
seem to last are low hp. A machinist friend and I figured out how to spray oil
onto the sun gear, and several Ross owners have had this done. I think Dave
Atkins has over 100 hrs on his since the mod. He's putting out close to 180 hp.

I suggest you call Ray Baker (machinist) (206-364-9894) to discuss.

There is no question in my mind a stock Ross would have trouble with a
turbo 3 rotor like Chuck is running above. I do believe however it is perfectly
adequate for the run of the mill side port 13B's that most people run. John
Moran is working on a six pinion planet carrier similar to the drawing below
that could change that scenario. The fact that the 2.86 to one Ross oils fine 
indicates to me that gear oiling is not a real problem for the Ross when used 
with a side port 13B.

I kind of like the Ross light weight design. There is no beating needle 
bearings for taking a lot of load for their weight and size. They 
are not only light weight they are small
in diameter for their load rating which reduces the weight of the psru 
housing as well. Another feature of the Ross that keeps it light is the prop shaft 
is made from relatively large diameter, thick wall steel tubing. The third 
feature is the excellent casting patterns for the various cast housings, in 
particular the bell housing, are very well done. This too keeps the weight down.

It is no secret that Ross has had some customer support problems lately.
It is unfortunate that Chris Ross does not seem to be a computer person
as email and the Internet are great ways to support your customers.
Due to that I would hesitate buying a new box from them right at the moment.
That does not mean however we should scrap their all their boxes now in the
field and start over.

Paul Lamar
 
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