Reality Check; Spinner Backplate

DanH · #1 11-02-2008, 09:04 PM

Quick check please. Pulled out my spinner kit today. The backplate is dished quite a lot, about 3/16" or so when you lay a straightedge across it. Is that common, or did I get the bad one?

szicree · #2 11-02-2008, 10:12 PM

Mine was like that too. I asked on here and virtually nobody would admit to having one. I can tell you that if you try to undish it you'll end up with an out of true condition instead (ask me how I know this). After I screwed one up, the replacement was a tiny bit better, but still dished. I made sure it was true and went ahead with it.

trib · #3 11-03-2008, 09:56 AM

No apparent dish on mine. I just put the spinner together within the past two weeks and both plates were fairly true.

pierre smith · #4 11-03-2008, 11:08 AM

......pretty much to where it needs to be, Dan. Ours had a little "dish" as well when we first installed it. 410 hours now.

Regards,

DanH · #5 11-03-2008, 11:42 AM

<<The prop will flatten it..>>

Wish it was true <g> This one is going on a Hartzell CS; the backplate hangs on 4 hub bolts instead of being clamped between the prop face and the engine flange.

I think I'm going to treat this as an opportunity to build a "screwless" spinner.

DanH · #6 11-05-2008, 10:17 AM

FYI, I spoke with Ken at Vans this AM. Ken says all available S602-1 backplates are dished, and pulling the S602-1 and S602B together won't hurt anything in the practical sense.

With the center removed per a CS Hartzell application, mine was still dished 1/8" when measured at the edge of the cutout. I did a trial assembly, fully riveted. The result is a lot of deformation at the rivet locations; obviously something has to give when you pull a dished part into compliance with a flat part. Personal choice; these parts are now patterns.

Don't think the dishing hurts a thing in a fixed pitch application.