Oh man. A marvellous stuff like X-plane only could be created by a sick person. A person with a disease called ‘PASSION for engineering’.

It’s a very rare disease…and in a high degree of confidence , especially if patients suffer this disease since a youth age, they are engineers.
There are no treatment available.

Flight Model is amazing, and this upgrades are marvellous, but in my opinion, there are secondary at this moment because only a few simmers will see it. Base customers have other priorities and other demands.
That’s a common symptom of the disease, focus in a very tiny engineering detail and forgot other areas not related with engineering.
I suffer it too, but in a minor degree than Austin who has very severe symptoms.

The swirl of the air is clearly the source of efficiency loss by energy waste but not a drag nor proportional to drag. It appears rather like a sort of constant deducted from the total energy which is wasted in accelerating the air flow.

With regard to the so called spiraling slipstream, there are many illustrations explaining vapour trails attached to the propeller blade tips as a sign of spiraling slipstream.

But, indeed they are just trace of propeller tip vortices visualized by condensation of vapour in the air due to the low pressure created at the tip vortex core. The tip vortices are stationary but because the plane moves forward it looks like it travell downstream and that is why such trail looks as if it penetrates any interfering structure on its way. Of course, some mass of air rotates together with propeller blades but the spiraling flow does not go so far downstream (the viscosity of air is very low) and then the slipstream gets almost aligned to the fuselage. Youtube search by ‘propeller spiraling slipstream’ will bring several videos showing how the actual slipstream flows by tufts on the fuselage of an RC plane.

Please file a bug.

Correction: it was beta 5 and second test flight seems to show the effect though I don’t know how strong it is in reality. My thanks to LR people for nice hard working!

Most of that is likely to be inconsequential with X-Plane modeling, but it’s a real world headache.

I think it should be a yaw effect that is increased, not a roll effect.

I have to read carefully and put my neurons to work while doing so, to correctly understand what you’re considering to implement – but it looks promising as I and others ( Murmur, Andy Goldstein et al ) have long “complained” about less yaw due to prop effects and specially the asymmetric slipstream hitting different areas of the aircraft ( wings, tail, fuselage… ) then there should be, specially before the “torque bug” was finally solved thx to Murmur’s finding… Looking forward to test it in Beta 4. Thx for sharing your thoughts Austin!