Hello to Rotary land, I've just
joined the list and am wondering if any of you people would be able to help me
out w/ some details. I'm interested in useing the three rotor 20B engine on my
a/c yet, I know very little about it. I'm wondering if there are any of you out
there whom may be able to shead some light on this engine for me. I'm wonderig
about weights and and some of the dimensional aspects of this engine[ firewall
to prop flange dim's as well as width, height and basic length dim's] I'm also
curious as to what props are being used on both the 13b and the 20b [ Constant
speeds-if any?] Any and all help includeing books, websites, or video's
would be great!
Jarrett;
I’m near completion of the
installation of a 20B in my standard Velocity RG. The all-up weight firewall
back, including radiators and oil cooler, excluding prop extension and prop, is
420 lbs. I went to some length to keep the weight down with custom oil pan,
manifold; etc. My firewall to prop flange of Tracy’s R1B is 41 ½”,
and there is 2” space between firewall and waterpump pulley, so pulley to
flange must be 39 ½. I guess the block is about 14” x 14” but the
overall width and height depend a lot on how you arrange things around it.
I’m going with a Catto fixed pitch
(66” x 85 pitch, 3-blade) because there isn’t a reasonably priced,
lightweight constant speed (variable pitch) prop that I like - yet. I’m
willing to sacrifice some takeoff and climb performance for good cruise (200 mph),
and top end (Catto says close to 250 mph).
For more photos you can go to http://www.alventures.8m.com/ROTARY%20ENGINE.htm
The dyno test report is at http://www.alventures.8m.com/Dynamometer%20test%20report.htm
Having said all that; I’d say the
20B is obsolete. Start fresh with the new RX8 Renesis.
Al