[TowerTalk] Rotor on AB577

[K4tmc@aol.com]

The 2.75 inch OD adaptor with a 1/2 inch wall thickness is more than likely 
the one that fits the AB-621 mast system; which is basically a "big brother" to 
the 577 system.  The 621 uses 6 inch diameter mast sections and does not use 
a clamp to hold the sections together.  The launcher assembly is just like the 
577, only a little larger to accept the 6 inch sections.

73,
Henry - K4TMC