Ralph,
I don’t know the physical dimensions
of the 20B shaft. Maybe someone else can answer your questions on
dimensions (my engine is assembled).
Yes, there is more space between 1 & 2
than 2 & 3 due to the extra bearing. The side housing is visibly much
thicker. You can easily see the bearing in the attached jpg. This
side-housing is one of the pieces unique to the 20B. The other side and
rotor housings are interchangeable with the 13B. The split shaft is held
with a long woodruff key. No, I have never heard of a one-piece 20B
eccentric shaft. The issue is how to get the 3rd bearing in
there. In my opinion it is plenty strong for our purposes. There’s
at least one 20B putting out 900hp.
Mark S.
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ralph Reed
Sent: Thursday, July 21, 2005 3:34
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 13b crankshaft
Does that mean that rotors 1 and 2 are farther apart than 2
and 3?
What fixes the two together? Are there no 20B cranks
that are all one piece? Why?
What is the smallest diameter of the shaft on either one and
how much over built is it?
Could the 13B be hollow and strong enough?
----- Original Message -----
Sent: Thursday, July 21,
2005 3:20 PM
Subject: [FlyRotary] Re:
13b crankshaft
Ralph,
The 20B utilizes a split shaft
design. The #1 stub-shaft slips over the snout of the 2-3 journal.
There is a 3rd main bearing between the #1 & #2 rotor.
Mark