George Lendich wrote:

Paul,
Well I received my Planetary yesterday looks ideal for the 2.85, all up

weight is 6.5 lbs.

E4D 15FN C6/E4D Planet Front with bearing
E4D 30AN Gear Front Ring
E4D 41BN Hub Front Ring Gear
E4D 3887AN Sun gear forward

The Ring gear (with the usual plate) and in this case there is a needle

roller bearing between

this plate and the planetary housing which has a female spline housing

(all part of the planetary

housing) which goes through (the usual plate) and will be good for

driving the prop shaft (i.e.

driving from the planetary housing)

I don't know if the needle roller bearing will be strong enough, or

should be replaced with a

larger ball bearing?

Depends on the overall design of your gear box. Do you have a screen

capture

of the drawing? PL

Then there is sun gear (however no thrust gear between the sun and

palanetary housing) - I believe

one will be required here and there should be sufficient room for one.

Tracy if your reading this, I would be buying one of yours, if it

weren't for the terrible

exchange rate - but necessity is the mother of invention in this case !!

The ring gear doesn't have the larger flat teeth, as seen on some C6,

however it has smaller

spline teeth which will be quite well suited for holding the ring gear

in place.

George (down under)

No problem George, I like to see people do their own thing and I know the
exchange rate problem.
I found that the needle thrust bearing (stock) will work fine but the life
span was less than I wanted (using industry standard formula for L10 life)
so I went to a roller bearing (larger diameter "needles").   I tried ball
bearings before the roller and they were a disaster, at least at input shaft
speeds.  You can see a picture of my ball bearing failure on my website.
I'd suggest sticking with rollers.
Let us know how the project progresses.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

I think you two are talking about two different needle bearings.
I think George is referring to the one between bulkhead
and planet carrier. Very low RPM compared to the helical 
sun gear thrust bearing. Unless of course he is using it 
for a prop load thrust bearing. Not likely because of 
the spline on the planet carrier.

You, I think, are talking about the high RPM helical 
sun gear thrust bearing.

Also several needle bearings back to back will work
for the helical sun gear thrust bearing as the RPM of
any individual one is reduced consequently the life is
increased.

BTW Tracy, I am getting some bounces on your email. Did
you get the latest schematic of the RS232 switch today?

Paul Lamar
 
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