Paul As per today all major cars are built with front drive and
almost built with a wheel bearing hub integrated with double ball
bearing who act as trust in both sides and as been proof since lot of
years..
I found one who can be use to match the prop stubs by machining
those hole stubs between the original wheel stubs and remove the
existing stubs and enlarge them to remove excess weight'.
The wheel flange have to be reduce in diameter to standard prop
shaft size flange.
The attaché triangular flange can be machined to .200" thickness to
reduce weight and all these parts are soft enough to be machined.
The hub can be hold on pressure fit and with 3 long bolts from the
inside aluminum casing and the head seal with orings to hold the oil
pressure inside the gears chamber, or 3 long treaded studs.
The aluminum casing can be machined from solid bar or get it cast
from foundry, it can also be added some ribs for more stiffeness
You can find the wheel hub bearing in Ebay at $40.00 and up depends
on quality.
The both shaft are about $80.00 from Slauson Transmission Parts,all
other parts as sun gear ,planet.ring gear,front ring,drum forward
,bearings less then $200 from Slauson few years ago
I am sending you several sketch showing how to built this gear box
and it might be a few more pounds of Tracy one , much cheaper and
fast to built with almost available parts.
JEAN PRUDHOMME
Jean also sent some picture of his rotary powered scale Piaggio
Avanti he is working on. Perhaps by mistake :) Interesting nose
gear.
BTW Jean set your epson scanner to save as jpg instead of pdf. Then
you can attach the jpg's to email.
Paul Lamar
Paul
I just finish to extend my garage with a total length of 50 ft and
all my tool are in place,i will have enough space to built the
fuselage plug. I am still building my original gearbox with internal
passage for the constant speed and install a stator. I came up with
the hub idea for someone want to built his own cheap and fast to
built. I do have all steel and aluminum parts for the gear box
Include the last 2 Velocity I built from Google.com and enter N274JP
and clic Prudhomme
JEAN PRUDHOMME
We were in south Florida so we visited Jean Prudhomme.
Jean is a very prolific and talented aircraft builder. He has been
working on airplanes since the late 60's. So far he as built nine.
Many Velocities.
Here are some pictures of gear box parts he intends to use on his
34 scale Piaggio Avanti.
Paul Lamar
Jean, I assume P-1160044 JPG is a photo of an auto transmission 7A
and a reduction housing. We are interested in the reduction housing
for a 3.i7 reduction housing. Do you have a dimensioned sketch of the
reduction housing? And can the housing be purchased separate before
machining?
Milo
Hi Milo
You can buy the housing from Speedway.com, is a special design but
it have 2 side a left and a right which one of the is longer and is
the one I do have.
It's already machined for 85 od mm bearing at the inside housing. and
along the inside is machined to 3.000" dia.
For my design it is just perfect for 45mm x 85x 19 mm ball bearing
sealed in the front and open in the back.
You can use a constant speed propeller by drilling hole in middle of
the shaft,
If you machine a prop shaft in one pce you can drill bigger hole and
lighter the weight, I will build one with the wheel bearing housing
which I take out lot of weight
Later I will send it to Mark Williams Enterprise to have one to be
built with my dimensions after all adjustment been done.
After cleanup the wheel bearing housing a 45mm id bearing fit
perfectly without machining just add pressure fit steel collar from
Mark Williams or any Auto Part suppliers.
You can buy the wheel bearing housing from Ebay at $40.00 and keep
only the flange and a bit of machining. Bearing from Ebay about
$25.00 plus each
My unit will be a couple of pounds more then Tracy but I am including
a stator and also will us a constant speed MT propeller with feather
for the twin
I send a hand sketch to give you and idea by using the wheel bearing
housing.
JEAN PRUDHOMME
Milo I am sending you some photos showing transmission parts shaft
matching the other pce we need there are from Slauson less then $80
plus shipping. I use those as reference and the shaft for the sungear
can be use by grinding tooths until it match the inside part of the
with a press fit and retain by round pins as Paul suggest. By matting
the sungear outside diameter and the inside dia shaft it will be
stronger in shear and machine the geared wheel off
JEAN PRUDHOMME
jean Please Turn Bold B off in you email program.
Paul Lamar
Jean I may have miss led you. I am an amateur at this game. We are
interested in using an automatic Xmission bell housing like you show
in your photo's with a nose piece as shown for a 3.17 setup and
different from you we wish to salvage the use of a prop shaft of an
IO 540 Lycoming engine that we have in hand that has 2 flanges to
work with and for taking up thrust loads in particular and dispense
with the necessity of screwing the hub on the shaft for experimental
purposes. Your extensive back ground has proven a big help and with
your permission we will tag along, right now everything is up in the
air but with guys like you and paul we are making good progress. I am
fascinated with the number combinations possible using standard
automotive components, we like aircraft pieces, especially hubs and
etc., to test with just to get data.
Milo
Let me clarify this a bit more. Milo is using recycled Lycoming
crank shafts that are typically cracked in the first journal fillet
area. The case is split and then bolted together just like a Lycoming
crank case. This accommodates a stock prop gov and CS prop.
Paul Lamar
Hi Milo
I just turned the rough shaft but I nee to make treads at flange ends
and atrear bearing,splines to hold the front flange and threads to hold
the rear bearing trust ( I can use a opessure fit collar but it will be
easyer to adjust the rear bearing to prevent excess load and few
thousands for metal expansion.
I will get the rest to be done on a machine shop near buy, i only have
small lathe, the guy will charge me $50.00 an hour to cut the treads and
splines.
I need a bigger lathe to machine the 12' back plate and other alum part
to hold the stator
I am sending you photos of the shaft with component, the planet side is
to long and I will cut the excess after assembly adjustment.
Paul I received the BLU STUDIO 5.5 as a phone ,you is it with intercom
when you received a call which is not convenient for me.
Do you have the shock mount cup drawing I will need to design the alum
plate .
JEAN PRUDHOMME
i am not sure what you need but here is our latestest thinking on that.
I have some parts made if you need them.
Paul Lamar
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