The last time I looked, Ray Harlan had the split rear bearing as a
pannyplane bearing - it works great and allows easy changing of prop
assemblies.
http://www.indoorduration.com/HarlanBrochure.htm
PIGTAIL THRUST BEARINGS
Simple “drop in” feature at rear bearing assures low wear and no
crushed motorsticks from snapping in the prop shaft
Precision-sawn diagonal slot gives full 360 degree shaft support
Strong aircraft aluminum alloy
Acclaimed by many to be the world’s best
model cross section hole shaft
weight max
size clearance
rubber
F1D/EZB .02”x.04” .016” 5/32”
.00073 oz. .085”
PENNY .02”x.05” .018” 5/32”
.00098 oz. .125”
Science
Olympiad .02”x.10” .022” 1/4"
.083 gram .125”
(no pigtail on SO bearing)
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
On Tue, 13 Nov 2007 23:10:25 -0000 "calgoddard" <calgoddard_at_yahoo.com>
writes:
> Bill:
>
> As usual, thanks for your expertise.
>
> Can you describe why you like the Harlan bearing insead of the
> standard Ikara thrust bearing? The latter allows you to quickly
> change props onthe Ikara prop hanger.
>
> I have Harlan's metal thrust bearings that are already sized for
> the .020 prop shaft. He calls them his Science Olympiad bearings.
> So there is no need for delicate drilling. But thanks for the info
> on drill sizes. That may yet come in handy.
>
> When you glue the shaft to the Ikara prop with CA, how do you know
> it is perfectly perpendicular to the prop spars? There is a tiny
> amount of slop there, but I suppose it makes little difference if
> the prop is vertical at the time. Why do you glue the prop shaft to
>
> the prop anyway?
>
> One year our team used special prop bearings that were machined by
> Geauga. They were really neat, but you couldn't swap out props very
>
> easily and you had to make sure you used a tiny rubber motor to keep
>
> the motor shaft pulled back during transport.
>
> Thanks Bill.
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
[Non-text portions of this message have been removed]
Received on Wed Nov 14 2007 - 10:01:13 CET