Sonerai 2 spinner

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planda31

Member
Joined
Dec 28, 2019
Messages
19
I am mounting the cowling on my Sonerai 2 project and need spinner advise before doing so. The prop hub has a 2" x .100 shoulder for prop location. What do I look for in the way of a spinner and backplate that will show me how far back to mount the cowling from the front face of the prop hub? Thanks in advance.
 

eschrom

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Joined
Jan 18, 2006
Messages
799
Location
Manchester, PA
Slip the back plate on the prop hub and where the flange of the back plate is, that's where the rear end of your spinner will be. Bring your cowling as close as you can. The gap on mine at the narrowest place is probably about 1/8", which I thought was pretty good, but I somehow blew the up-down alignment and my spinner stands up above the cowling a bit. But fixing that will require a firewall adjustment, which I haven't done yet (11 years later).

Ed
 

planda31

Member
Joined
Dec 28, 2019
Messages
19
Slip the back plate on the prop hub and where the flange of the back plate is, that's where the rear end of your spinner will be. Bring your cowling as close as you can. The gap on mine at the narrowest place is probably about 1/8", which I thought was pretty good, but I somehow blew the up-down alignment and my spinner stands up above the cowling a bit. But fixing that will require a firewall adjustment, which I haven't done yet (11 years later).

Ed
If I place the backplate on the hub, there will be no shoulder to locate the prop. Is there a spinner plate that goes in front of the prop?
 

planda31

Member
Joined
Dec 28, 2019
Messages
19
Ok, dumb questipn here. Does the prop locate off the bolts, or the shoulder on the crank hub? If off the bolts, I can just drill and ream holes in the backplate for the bolts to locate it.
 

eschrom

Well-Known Member
Joined
Jan 18, 2006
Messages
799
Location
Manchester, PA
The hub's raised pilot is what locates the prop. Your back plate must have a hole of the same size, centered, with just a bit of clearance so that it slips over the pilot and rests against the hub flange. The back plate is quite a bit thinner than the pilot, leaving the pilot sticking out so it can center the prop. Yes, there is another bulkhead for the front of the prop. The bolts keep it all (front bulkhead, prop, back plate, and hub) sandwiched together. Hope this helps.

Ed
 

planda31

Member
Joined
Dec 28, 2019
Messages
19
The hub's raised pilot is what locates the prop. Your back plate must have a hole of the same size, centered, with just a bit of clearance so that it slips over the pilot and rests against the hub flange. The back plate is quite a bit thinner than the pilot, leaving the pilot sticking out so it can center the prop. Yes, there is another bulkhead for the front of the prop. The bolts keep it all (front bulkhead, prop, back plate, and hub) sandwiched together. Hope this helps.

Ed
It helps a lot. Here is a pic of the hub and the shoulder. Does it look correct?
 

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