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 3/4
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
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