Paul,
WOW, your timing is almost perfect. This PSRU idea is just what
I need for a light weight power system.  Would you tig weld
or friction weld the shaft parts and then heat treat before final machine?
Dan F

Do you have friction weld capability? It is great if you have it.
Lots of stuff is made with friction weld these days.

Yes I would heat treat and finish grind.

There is lots of potential for saving 15 or 20 pounds in all these
hollow shaft designs.

I am half thinking of producing one for a constant speed metal
propeller.  The investment would be enormous but I think I could keep
the price under $3,000. Less the governor of course. The governor
would be cog belt driven.

What does everybody think about that?



Paul Lamar

Jean, I have never designed a canard, however the foreplane  of higher
incidence angle than the main wing and a higher wing loading than the main
wing are used singly or together to stall the foreplane before the main wing
to get the nose to fall through and unload the angle of attack on the main
wing.

I prefer a tapered main conventional wing with a straight trailing edge
and strakes so that the remaining lift shifts aft as the wing aproaches
stall. not as good as a canard but beter than the hershy bar wing . I would
strongly recommend that you get in touch with Barnaby Wainfran who writes
articles in Kitplanes magazine about all aspects of stability and control.

Having built several planes you should have a handle on what their designers
were doing.

As  far as gear train options one other possibility is a quick
change center section as used on midget circle track cars. It would be
smaller than the sprint car equivalent and they use change gears which let
you adjust gear reduction . the change gears are simple spurr gears which I
never broke in the sprint car although I destroyed a number of ring and
pinion sets. The housings I used were magnesium and they had a light weight
spool i place of a differential. The axle shafts on these as well as
passenger cars don't turn the RPM of a propeller so a look in a bearing
catalog is also necessary. The rated speed on bearings is apauling low for
roller bearings in shaft sizes we need for a propeller. I was wondering what
kind of afterbody shape you are intending behind your engines to get a 50"
wide firewall to a point of closure. Just a thought, but could you start
flattening the shape  ahead of the engines as early as practicle and  end
with a flattened tail rather than a pointed one. It would be more wetted
area  but it's

another way. Also You might have a slightly open ended tail and dump
cooling air out there.



Paul, I burnt a couple of cd's on the side housing designs in three
different formats. The autocad 14 system has always been 3D,   I just use it
in a single pane rather than four panes to get some drawing room.They have
other systems that are 2D such as the LT series with limited capabilites, I
tries to render the drawings in Rhino and it  oweflowed due to drawing size.
I am about to where I will need to break out the  parts into individual
drawings. After I get the bolt holes for the manifold flanges and drilled
passages for oil pressure and scavenge on the current parts I want to do a
set of foundary patterns on my new cnc router. Also I diden't fillet the
shapes on the solids because that makes transfering to different  file
formats sketchy.

I included a drawing viewer that will open the drawings and
print them on whaever printer is hooked to the computer. You might want to
render the views before posting for clarity so the parts wont look more
complicated than they are. Also on the drawings is the complete set of all
cross sections from which all dimensions can be taken. Can't mail till
monday when the post office opens.

george grimes