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Kelly,
Sure does, I am awaiting the one from Matt to then
get sent to the vulcanizing firm for inspection. I will send
enough drives to be redone, to cover all sales to date, such as
yours, to be done with the correct rubber. Will post what I learn
once I get the "official" version. Then I will send my jig to
Randy to get the rest redone in the US as that is where the
freight savings are.
Can you send me your postal address some time so I can send
direct to you p-lease? Not expecting any movement under a month
sadly ,as customs have Matt's in their hot hands. Usually takes 2
weeks just to get past them, no different in the US either.
Neil,
I have one of your "Flex Drives" sourced from Randy
here in the US...…...Does it come under the recall for
the incorrect rubber formulation ?
Kelly Troyer
When
racing with the stock Mazda trans we often lost the
tailshaft bushing. I cut a new bushing in half and
pressed them in with a small space between the two
pieces. I put in a tapered pipe hole between the two
for pressure oiling. I used a double lip Garlock
seal and made up three "U" shaped clamps to keep the
seals in place. And the Garlocks prevented the
bushing from walking out of the housing when it got
hot. The oil pump put the oil through a cooler to
keep that bushing cool. When we started using the
Richmond Gear trans I did the same mods to it. Never
a problem. Once one of those bushing starts rotating
with the shaft it will wear the hole bigger and ruin
the housing. If you must use a bushing, think of a
way to pin that bushing in place. Even a tight press
fit will let go of the bushing if the housing is
overheated. Many a Mazda trans has died this way.
A
synthetic trans lube will foam less and then return
drain better. Much better if the engine oil is being
used in the reduction unit as well. We used RedLine
racing 40 weight. Pours like lighter fluid. Never an
oil related failure in 30 years. Rotaries have an
oil foaming problem. Foam is air and oil mixed. Air
is an insulator.
So,
oil cooling is much improved with a synthetic.
In
the Mistral Piper, they used aircraft oil. It foamed
badly and reduced the effectiveness of the coolers,
thus over heating the oil. Never made it to
Sun&Fun.
Just
a few thoughts......................Lynn E. Hanover
In a message dated 5/8/2019 7:11:13 PM Eastern Standard
Time, flyrotary@lancaironline.net
writes:
Dave and all,
My prop shaft is on
timken taper bearings, so does not need the
pressure feed. Matt is too polite to tell the
whole story. The initial run did not get enough
oil to the bronze bush between the input shaft
and the prop shaft --- so it did what all oil
starved bearings do --- it melted. Luckily
Matt had his rubber cushion drive self destruct
as well-- I say luckily as that caused the
dismantle of the redrive which found the cooked
bronze bush. Fortunately no other damage. This
prompted us to make the unit self contained as
for lubrication. Heat may be a problem, but I
doubt it and time will soon tell.
Rubber cushion drive --- Matt has really
copped the "pineapple" on this. Finally turns
out that the rubber firm used the wrong rubber
--- Still chasing that problem down but appears
lack of communication between the office and the
workman doing the job. In ignorance and lack of
knowledge he put the wrong rubber in--- totally
different rubber to the one I am running
currently. These cushion drives will be subject
to recall and the proper rubber fitted. Very
embarrassing and infuriating for me.
So as info becomes available I will post, but
the self contained oil should work well and will
simplify things.
Neil.
Well said, Charlie. Here is
Neil's page with diagrams:
BTW, very nicely done Neil.
Best I can tell it is a pressure fed
bearing just like Tracys.
Dave Leonard
Matt,
I've not followed Neil's version of the
drive carefully; he may not be using a
sleeve bearing. But Tracy's drive *does*
use one, under that oil feed hole in the
'fat' part of the housing. Dave's
telling you that if there's a sleeve
type bearing in there that's designed
for pressure feeding, lack of oil
pressure is certain death, in short
order. If Neil is using a ball or roller
bearing back there, that's a different
game entirely, and I'd want his input on
whether it needs pressurized flow, both
for lube and for cooling.
On 5/8/2019 3:44 PM, Matt Boiteau mattboiteau@gmail.com
wrote:
Neil's. 3.17 ratio.
I've found the back gears push
the oil to the front pretty well.
- Matt Boiteau
Matt, is this one of Tracy
Crooks drives? If so, it will
absolutely fail in short order
with no pressure feed to the main
bearing.
Dave Leonard.
So far on the ground,
static 2200 prop rpm for
30seconds, temps only got to
135°F.
Haven't flown yet. Will
advise in June.
- Matt Boiteau
Matt,
So you are
trying using self
contained lube
with no pressure
feed from the
engine and no
drain...…...Watch
your
temps......…….Let
us know what
happens...…...
Kelly Troyer
I've been
experimenting on
Neil's PSRU with
sealing it up.
Only adding a
breather vent on
the rear
housing. So far
I've only done
ground testing,
but all seems
well enough to
fly with it soon
enough. The
Tygon house in
the picture was
only to see the
oil flow, it's
capped off now.
I ran gear oil
70w-140 and it
was way to thick
and came out the
breather vent,
so went back
down to my
normal engine
oil 20w-50.
Filled half
full, but I
think I can go a
little less,
haven't tested
the idle level
yet.
I have a temp
sensor (1/3
down), and a
digital level
sensor (half
way) installed
in the rear
housing as
well.
-
Matt Boiteau
On
2019-05-07
12:32:26 PM,
Steven W.
Boese SBoese@uwyo.edu
<flyrotary@lancaironline.net>
wrote:
If
the original
return line
was not
enlarged, the
"vent" line
simply acted
as an
additional
return line
and my
gearboxes
operated
completely
filled with
oil.
Steve Boese
> On May 7,
2019, at 9:41
AM, Jeff
Whaley jwhaley@datacast.com
wrote:
>
> ◆ This
message was
sent from a
non-UWYO
address.
Please
exercise
caution when
clicking links
or opening
attachments
from external
sources.
>
>
> Hi Steve,
is the
enlarging of
the oil return
necessary?
> I thought
you first
tried
enlarging the
return line
expecting it
to improve
draining, only
to find no
improvement
until the vent
line was
added.
> Jeff
>
> Jeff,
> At this
point I have
only 3 hr of
flight time on
the gearbox
with the
modified drain
and vent. I
have not
observed a
significant
effect with
respect to
power
absorption or
heat
generation.
>
>
Connecting the
vent line to
the foot of
the rotor
housing was
ineffective
even though
this location
was above the
oil level.
Connecting the
vent line to
the area of
the oil filler
opening at the
top of the
center iron
allowed the
gearbox to
drain as
intended.
>
> The most
troublesome
part of the
modification
was enlarging
the oil return
to 1/2" NPT in
the rotor
housing foot.
>
> Steve
Boese
>
>
> --
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