Here's a picture of the new prop shaft for the RD-1A.  Shaft diameter

at

flange end is 45mm.  Material is 4340 thru hardened via heat treat.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

Looks great Tracy.

Paul Lamar

Tracy,

Looks very nicely done. Does the shop know what it is for?
Probably an airboat, yeah, an airboat'd be my guess.  ;-)

Good alloy - you can get up to 225Ksi yield out of it,
and even at 200Ksi it has about 14% elongation before
failure - i.e. not brittle.  Chrome-moly alloys are a really
good class of steels for high strength machinery.

So,45 mm OD, I assume behind the step, what is the ID?
What is the fillet radius at the step just behind the flange?

Bill
Long EZ builder & pilot
mechanical engineer

Its two piece Bill.

Paul Lamar

The new prop shaft is a single piece part machined from a forging.  This is
even stronger than machined from billet because of the improved grain
structure.  The radius of the fillet between hub and 45mm shaft is .093".
ID of gun-drilled shaft is .875".

Yeah Bill, airboat it is :-)

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

I stand corrected. Single forged piece! I am IMPRESSED!!! No pressed on
and welded flange.

Paul Lamar
 
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