Recent content by NapierDeltic

Another thing that concerns me at Tesla turbine: I know from wind power plants and similar applications that there is a certain proportion between gas speed (wind) and rotor speed at which energy transfer (efficiency) is maximum. There is a certain formula I can't recall. I don't know how this...

Haven't thought of it!

One thing that doesn't fit my mind is why Tesla turbine doesn't like backpressure! As I figure it (and was described by its inventor), the mechanism is based on micro-adhesion between steam molecules and turbine disks so a direct transfer of kinetic energy from steam to rotor; no other...

Hi Steamchick. I have little experience with Tesla turbines - I mean even from informal point of view. From what I have read, it seems many had poor experience with it (I mean low efficiency even in ideal conditions - dry steam or alike) while few have hit the bull's eye. I think the efficiency...

In fact, you are right, Minh-thanh; most high octane gasoline has antiknock additives. only those allow high compression ratios without issues. Though, in many engine operating conditions - for a c.r. 12-1 engine-, compression does not start from 1 bar; engine being partly choked on its...

Hi, I don't know if I should enter such hot discussion. I have read some engine books, most appearing in 1950-1990. First comment, as an interesting example for the case. Free piston engines were (and still are) one of St. Graal of IC engines. At the level of 70', Sigma(France) and...

Maybe I'm wrong but I believe even swapping to final fluid with its own viscosity curve might require another final tuning - lots and lots of diagrams to get closer to the truth... Luckily, electronic control comes in support. Care should be taken, though, for stable vs unstable processes -...

I really take care not to push any button too much... Love to see development of experiment and consequent corrections. And respect for using digital support -something still far for me; at least in what concerns software understanding and put-to work!

What I have said above comes to add to K2's details. Uneven mixture is both effect of suspended fine fuel particles in air flow that has a rhythmic beat on cylinders and a continuous flow of a film coming from larger fuel particles which adhere to manifold walls. Both have higher inertia and...

If engine is not intended for performance but for smooth running, this might be of help (sometimes hot spot is bath shaped and diverts air flow 90 deg. to retain and vaporise gas droplets). But this is old technology, mating with less-than-perfect carbs...

Maybe last templar, half knight half monk; and living in a cave :) . As I think the problem is much more complex (we were discussing here just one of the most simplified models, but if you want to go deeper, you notice it is half meaningless, unless you take in consideration other factors...

I guess, but not by me :) ! Last serious calculations (excluding +,-,x,: ) I have done maybe 30 years ago... Please let me return to my cave! And I am not ironic. Any knight needs an ideal to continue to fight ; be it Holy Grail, crusade, wealth or love...or other. I have already defined...

F is resultant of forces acting on analyzed half of crankshaft. F1 is resultant of forces acting on the other half of crankshaft. Situation is mirrored on either halves. This was my judgement. Cheers!

Yes K2, that-s what I thought; on static, forces on both halves being on the same magnitude (not equal) looks like central bearing acts partly like a fixed attachment point for each one half. And I said (and meant) just a bit more stiffness. Of course, my "simulation" was also entirely mental...

I think is even a bit more than your estimation. First, 2 bearings, due to internal play, do not take any bending load (torque); central bearing is much evenly loaded on both sides and takes much more pure radial compression. And, as bonus, the other side of crankshaft (if we judge one half)...