How can I make the bottom of an extrusion thicker than the top?

[Anonymous]

The last time I posted this, it was flagged as spam for some reason, so I am posting it again.

I am trying to design a Cessna logo that my dad recently found for our Cessna 195, and after tracing the image (mostly with splines, but also lines/arcs) and extruding it, I can't figure out how to get the bottom of the extrusion thicker/bigger than the top face of the extrusion, like in the real emblem. I have tried to use lofting in other attempts, but it would just say the model intersects itself. I am very new to Fusion 360, so if there is an easier way to do this that I haven't figured out, any ideas/suggestions would be helpful.

Here is what I have so far:

https://a360.co/2KIkCwd

And here is a picture of what the actual emblem looks like:

[ToddHarris7556]

Have you tried adding a taper angle to the extrusion? 

i.e. trace the top profile, and extrude it with a 10degree taper angle.

[Anonymous]

I've tried. When I add anything more than a 0.001 degree taper angle, it displays an error saying "tool body creation failed." 

[TrippyLighting]

That's not a surprise. When using such tight radius splines that is a naturreal consequence.

However, a bigger reason for this to fail is that none of the may lines, arc and spline segments are tangent to each other. You ned to use the tangent constraint to make that so and then you'll have to probably do a good bit of adjustment.