Spinners
#1
Thread Starter
My Feedback: (2)
Spinners
I would like to start a discussion regarding spinners. I have a DLE-111 in an Extra 330. I have installed an MPI 4-1/2" aluminum spinner. This spinner is very good looking, the finish is as good as you could ask for. The problem i am running into is when the cone is tightened the back plate warps. It not only looks bad, it creates a condition that brings a portion of the back plate very close to touching the cowl. The question, is there a way to avoid this and still be confident the cone is secure? I wouldn't mind replacing it with another brand of spinner but not crazy about spending $100 plus to do that.
Any thoughts, ideas, suggestions will be appreciated.
Any thoughts, ideas, suggestions will be appreciated.
#2
Senior Member
Simply stop tightening the cone before the backplate starts to warp. Large spinners are not what binds the prop to the drive shafts. They don't have the leverage to do so.
The cone should not contact the prop anywhere. It should not even touch it. So it has absolutely no leverage to hold the prop to the engine. That's what the engine bolt(s) and washer are for.
I'm sure you already know all that but there are lots of members who probably don't.
The cone should not contact the prop anywhere. It should not even touch it. So it has absolutely no leverage to hold the prop to the engine. That's what the engine bolt(s) and washer are for.
I'm sure you already know all that but there are lots of members who probably don't.
Last edited by da Rock; 07-16-2014 at 01:25 PM.
#3
Senior Member
When a cone continually loosens in use, the problem is with the surfaces on the cone that contact the cone. Rough them up to introduce significant friction to resist spinning.
If your backplate isn't robust enough to stand sensible tightening of the cone, you've either bought a poorly designed spinner or gotten a spinner that doesn't belong on an engine like the one on which you've put it. There isn't much cure for that.
Gas engines with multiple prop bolts for example don't play well with friction held spinners.
If your backplate isn't robust enough to stand sensible tightening of the cone, you've either bought a poorly designed spinner or gotten a spinner that doesn't belong on an engine like the one on which you've put it. There isn't much cure for that.
Gas engines with multiple prop bolts for example don't play well with friction held spinners.
Last edited by da Rock; 07-16-2014 at 01:13 PM.
#4
Senior Member
The backplate shown in the ad for the MPI 4.5" spinner ($40) doesn't look very thick. A Johnson Stunt Supreme I once had would throw spinners regularly. One night, I used some brass wire and a drill bit the size of the wire to put some teeth into a backplate. Drilling holes around the spinner, half the hole in the cone and half in the backplate, made some places to epoxy short pieces of the wire. They gave the backplate teeth that fit into the cone.
Clamp the cone to the backplate and drill along the seam.
Clamp the cone to the backplate and drill along the seam.
#5
When a cone continually loosens in use, the problem is with the surfaces on the cone that contact the cone. Rough them up to introduce significant friction to resist spinning.
If your backplate isn't robust enough to stand sensible tightening of the cone, you've either bought a poorly designed spinner or gotten a spinner that doesn't belong on an engine like the one on which you've put it. There isn't much cure for that.
Gas engines with multiple prop bolts for example don't play well with friction held spinners.
If your backplate isn't robust enough to stand sensible tightening of the cone, you've either bought a poorly designed spinner or gotten a spinner that doesn't belong on an engine like the one on which you've put it. There isn't much cure for that.
Gas engines with multiple prop bolts for example don't play well with friction held spinners.
Bob
Last edited by sensei; 07-17-2014 at 03:06 AM.
#20
Thread Starter
My Feedback: (2)
Had to share this with you in this thread, i just happened to stumble across looking for another item.
Can this possibly be worth a darn?
http://www.abellhobby.com/XOAR-4-5-A...er-p/xs4.5.htm
Can this possibly be worth a darn?
http://www.abellhobby.com/XOAR-4-5-A...er-p/xs4.5.htm