Not to add more confusion to the current discussion re. PSRU designs, but here's an interesting solution to the blade length problem. Unfortunately, this particular product is too light duty for the Mazda rotary, but perhaps it offers an interesting possibility in concept. Any comments?

http://www.sunflightcraft.com/en/coaxp.php

Beto Replay

What blade length problem?

Very bad ground adjustable prop hub design. Too heavy.

I also doubt the efficiency claims. There may be some but I doubt if it is that much.

Paul Lamar

The Rotary Engine free News Letter. Powered by Linux. If you want off
the list PLEASE let me know and I will remove  you.  ACRE NL web
site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas
Copyright 1998-2017 All world wide rights reserved.