downundarv8builder
Member
I purchased a Hartzell composite prop (G2YR/N7605W-2X) from Vans and while it is a thing of great beauty, the blade chord is very wide and I'm a little concerned about it interfering with the cowling when the pitch is coarsened up. It does have the extended G hub and while I note that it is not compatible with the Sam James cowling, I have the standard Vans cowling and I haven't heard of anyone having any problems with this after the move to the G hub. Anyway, I'm fitting the cowl at the moment and I'm wondering whether anyone has some guidance as to just how far back the spinner backplate should sit from the aft section of the hub. This of course will dictate the fore/aft position of the forward edge of the cowl with the stipulated 1/4" clearance. The Hartzell manual specifies a number of different spacer/washer combinations that are acceptable and at the moment I have fitted the single supplied spacer between the hub and the backplate. This is my first prop so my knowledge base is rather limited so I haven't tried twisting the blade to see as I'm not sure if you can do this sort of thing without damaging the prop. A very specific enquiry I know but does anyone have any information as to whether this will provide sufficient clearance from the cowl when the prop is at full coarse pitch? Any help would be much appreciated.