Paul and George

 There is a part design of shaft with detachable flange who can be
 built with
 splines with the shaft and threaded nut to secure the flange and the
 bearing
 the nut can be lock with flat head screw true the flange or outher
 ring with
 splines

 Jean Prudhomme

 Send me a sketch, dwg or jpg.

 Paul Lamar @ Aero

 DWG jpg

 Jean

 How does the 3.5 inch dia. carbon fiber prop shaft connect to
 this part?

 Paul Lamar


 __
 Paul

 There is the way of the propshaft will attache to the 3.500"ID X .180"
 wall thichness,i found a double side trust sealed ball bearing and
 Mark Williams have a 45mm deepgrooved double ball bearing but i can
 use their number to find the 50mmx90mmx32.1mm.

 To use the carbon tubing i have to go with the 5"od x.250 wall alum
 tubing reinforced with 1/4" gusset.

 On the flange attachement on back of the bearing housing have to be
 beeffy up more then 1/2" thichness
 I will redesign in 3D after i finish to figure it out all dimensions.

 I still in contact with Mark Veldhuis of PST inc.

 Jean Prudhomme

 That looks pretty good. Look into helicopter or thin section
 bearings.

 Paul Lamar @ Aero

 Hi Jean;
 It sounds like you plan to have carbon and aluminum tubes in direct
 contact - carbon eats aluminum through galvanic action. You will want
 an insulating layer between them. I have heard a single layer of glass
 will work from several sources, but no solid numbers to back that up.
 The layup schedule, helical angle and epoxy for the carbon tubing and
 method of attachment are also important factors.
 There are AL structural bonding processes.

 You might also look at the damper used for the Cirrus VK-30 driveshaft
 installation.

 Cheers
 Cary

 The shaft is made with steel and bonded to
carbon tubing no carbon fiber is in contact
with aluminum,if you look my dwg it show clearly
how i am doing the shaft and wet aluminum shaft
housing with bearings and seals

Jean Prudhomme
Jean
Do you plan to have the tube weldment stress relieved and then heat treat
to get back strength?  What is weight of this assembly?
Dan F

Jean,

Given the weight and the cost, I hesitate to offer up this suggestion, but
experimental builders have successfully used a torrisonal damper product
call "Flexadyne."  Jump into the following thread for information.
http://www.homebuiltairplanes.com/forums/firewall-forward-props-fuel-system/1465-flexadyne-drive.html
.

If you will pull up the Mini-IMP website (http://www.mini-imp.com/), you
will find a number of discussions on the topic, including problems
encountered with flexible shafts and an array of approaches to resolve the
issue.

Regards,
Gordon