Spinner too short? or Saito engine shaft too long?
I need some advice/guidance.
I am in the middle of a building a kit (Sig Kadet Sr.) and plan to use a new Saito .62 I've purchased. Sig recommends a 2" spinner. So after much looking I bought a Dave Brown Vortech 2" "standard" aluminum spinner. Dave Brown recommends their "short" adapter nut for spinners under 2.5" so that is what I bought to go with.
I just received the spinner and adapter nut so I thought I'd check to see how they fit together on the engine. So I first removed the Saito washer, prop nut and lock nut. I then slipped the spinner backing plate all the way down the engine shaft until it was against the brass-colored non-removable spacer (with the knurled face - sorry not sure what this is called). I then spun the adapter nut onto the end of the threaded engine shaft as far as it would go. It spun easily until it bottomed out so I'm pretty certain it was all the way on even though it is only finger tight. I then put the spinner cone itself over the adapter nut and screwed the retaining screw through the tip of the spinner cone and into the adapter nut. First photo below shows the pieces I am referring to. The second photo shows the issue.
Here is the problem. The spinner cone is still about 1/4" short of reaching it's backing plate. It would seem I'd either need a longer spinner cone or a shorter threaded shaft on the engine. I've done a lot of searching and haven't read anything like this. I am surprised as it doesn't seem like I'm using overly small or large engine or spinner. . This is the shortest adapter nut Dave Brown has available and it is really pretty short - just under 3/4" total. A longer adapter nut would only push the spinner further away from the backing plate.
Thoughts?
Thanks for the help!
-Matt
Last edited by MattKennedy; 02-06-2021 at 04:11 PM.