RE: 3 bladed prop
Was looking for 3-bladed props & spinners for a nitro-planes P-38 (little one, 52" span, takes 1 3/4" spinners). Found that Mecoa now makes the 3-bladed Zinger (JOZ) spinners; you can also get them from SIG, in sizes from 2 - 2 1/2". Now if only I can find a 1 3/4" red 3-bladed spinner!
-RB8