Paul
 Tel me how the driver shaft is attached to the sun gear on
 Tracy is pressure fit ,welded or others??
 i still waiting the shipment of gears

 Jean Prudhomme

 Pressure fit and then two welded in 1/4 or 5/16 pins welded
 in 90 degrees apart. He used to use one and Dave Leonard
 broke it with his turbo.

 Paul Lamar



 Do you think Paul
 Dave took some photos of broken sun gear shaft and do you have more
 clearly
 photos showing the shaft attached to the gear


 Jean Prudhomme

 Here is what I have Jean.

 Paul Lamar


 --
 Paul I receive all the gears components but i guess i do have the wrong sun
 gear for this application it fit on the planet but if i look yous is all the
 same outside diameter and i guess it,s a weak point at the big groove
 I do have the Slauson catalogue, could tell me which part number it can be

 Jean Prudhomme

 I don't have the catalog here. I'll be home in a couple
 of days. That looks like the right part. If it does not fit
 You may have the wrong planet carrier.

 Grind or cut off the teeth on the end you don't use.
 The weak point is not the groove. It is always the root
 of the tooth.

 Paul Lamar

 There used to be no pin at all, just rosette welds. That is what I
 broke(not the shaft, and not a pin). It was not the turbo that did it, but
 a backfire due to a bum chip in the computer. There is a picture on my
 website under 'trials and tribulations'.

 --
 David Leonard

 Turbo Rotary RV-6 N4VY
 http://N4VY.RotaryRoster.net
 http://RotaryRoster.net


 Jean, here is all I have on the sun gear.. Use the large part
 and the front planet carrier.

 There a third in the A4OD. It is the overdrive planet
 carrier. That is not the one to use.

 Paul Lamar


 Hi David
 I went back on your web site reading about the sun gear problem due to the
 back fire and i saw the photo of the new sungear which is the same size
 outside diameter and i am wondering from which planet this one come from



 Jean Prudhomme

 Paul i am working on my gearbox and i am looking for prop governor
oil pressure scale and -operation schematic and operation rpm range
which you produce on one of your past e-mail but i can not retrace
it,also if you have the tracy propshaft dimension so i can refer some
dimension to design mine almost the front end flange to the first bearing

Jean Prudhomme          


I don't have the dimensions on Tracy's prop shaft. It is a GM rear axle
of some sort I think.

I would build something like this instead. It would be a lot lighter.
It uses needle bearings which are much lighter. They work fine in
the RPM range of the prop shaft. It also does away with one spline
which decreases the back lash.


You might talk Jeff into helping you build the box as he
is here in SoCal and I can work with him on it. I have all the
Rhino dwgs on these things.

Most prop governors have a built in oil pump
that increases the engine oil pressure sent to the prop.

The prop governor does not have to be driven off
the gear box. It could be cog belt driven from
the e-shaft.

The down side to a metal constant speed
prop is the high 50 pound weight. An electric constant speed
composite prop would be a better choice and will work
with any gear box. It does not need oil in a hollow prop
shaft.

Paul Lamar Back home.