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  1. P

    Passive Variable Pitch Propeller

    https://books.google.ca/books?id=KX3mAAAAMAAJ&pg=RA3-PA64&lpg=RA3-PA64&dq=thompson+industries+iso+rev+propellers&source=bl&ots=Z6t5s5J1rX&sig=ACfU3U2YJ5nbD0PqOKAcJ5GU7q-FOBm9dA&hl=en&sa=X&ved=2ahUKEwiv_IPk8tSFAxWYEjQIHfEqDgk4ChDoAXoECAYQAw#v=onepage&q=thompson industries iso rev...
  2. P

    Turbo-normaliser question

    Pretty hard not to have SOME tubing to get from multiple ports to turbo, but to even try to build resonantly constructive length requires a LOT of tubing. To really understand this, slip on over to the music department - where people making instruments seem to understand resonance quite well...
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    Craig Cato's New Propellor Gave Us Insane Results! | Whisper Sling Prop Test

    OK: Everyone is too polite to ask, so I guess that's my que: If one were to design a fixed pitch prop to behave as per Prandtl concept, would you accept a little bit of positive pitch at the tips thus loading them up at start of takeoff roll or increase overall pitch so the last bit of inverse...
  4. P

    Turbo-normaliser question

    I expect there is a pretty strong pulse available to bounce off of a collector feeding a turbo, but "tri-Y" systems are more interference that fully resonant (check the length you need for a full wave primary and you will see what I mean). I would hardly call it "my bias" but not every airplane...
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    Craig Cato's New Propellor Gave Us Insane Results! | Whisper Sling Prop Test

    Without measuring up what I have seen, I think his props have more of an end plate effect than "winglet" capable of recovering energy from flow regions. Most of all: can't tell what effective AOA is in flight near tip.
  6. P

    Turbo-normaliser question

    Usually a room-in-the-cowling but IMHO the glowing bright red bundle of snakes required is a non starter. The shift in radiated heat back towards the engine is a fact of life that turbo retrofit fanbois just seem to miss.
  7. P

    Turbo-normaliser question

    I have spent hundreds of hours in middle altitudes behind O-360 and fixed pitch. You have to be prepared to tolerate the loss of IAS and HP but in my case the prop fit right in to WOT operation without overspeed or overheat. Mostly worked because no turbo, so power fell off in proportion to...
  8. P

    Turbo-normaliser question

    No exposure to 550s at altitude but TIO540s in 601P and TSIO520s in P210 were nasty offenders. I do understand the TCM made a genuine effort with the 550 - just haven't been around any.
  9. P

    Craig Cato's New Propellor Gave Us Insane Results! | Whisper Sling Prop Test

    This thread has cost me an entire morning watching videos from Al Bowers. I still REALLY want to see some hard data on the Catto prop vs. several others, but I have been so busy with engine stuff over last many years I haven't paid much attention to the aerodynamic world. This one plunged me...
  10. P

    Turbo-normaliser question

    Just to hammer a thumbtack in with a proper sledge hammer: When adding boost to an SI engine at altitude the ancient designs of Lycosaurus and Clunkinental engines have to throw GALLONS of fuel per hour into the combustion chamber to try to make up for cooling deficiencies in the flight...
  11. P

    Turbo-normaliser question

    Agree that when done right, the penalties are small, but the whole point I was trying (and obviously not succeeding) to make is the VW head is pushed to its absolute limit in 80 or so HP aviation application and adding anything at all is pushing it further. No free lunch - not even a cheap one...
  12. P

    Turbo-normaliser question

    Common misconception that turbocharger energy comes from pixie dust. Not so. Not only do you have to produce the power it takes to drive the compressor (as is so with ANY supercharger) you now must deal with Bilski mentioned - more heat. Not just the rejected heat from making the extra power...
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    Craig Cato's New Propellor Gave Us Insane Results! | Whisper Sling Prop Test

    Very interesting, but I sure would like to see some hard numbers in comparative testing. LOVE the pitch setting arrangement - and the comments about how much engine RPM each increment of pitch shim gives is a definite eye opener. The only adjustable pitch props I made used synchronizer gears...
  14. P

    Ultimate SI for u/l, EAB

    My thought was one common cylinder but dedicated crank, cam and crankcase with common architecture - to keep simple and light.
  15. P

    Ultimate SI for u/l, EAB

    I wrote a reply, but it gets too geopolitical. Let's just leave it at I opened my first office in China about 30 years ago and remain well aware of how things work there.
  16. P

    Ultimate SI for u/l, EAB

    I would hope that monitoring exports from USA would prevent that. Then again: nothing stopping China from building them in country.
  17. P

    Ultimate SI for u/l, EAB

    No, have not seen any evidence - just imagining how China normally does what they do. They might even be cloning in country - as they do with Rotax. BTW: then they say "cooling is predominantly liquid" I believe charge cooling is secondary. At just under 1HP/lb. not sure if that includes...
  18. P

    Ultimate SI for u/l, EAB

    The rotary side is already covered by Austro at 55 and 110 HP - and I don't think they are flying off the shelves (for civilian use - but the owners - CPC may be stuffing hundreds into Iranian drones sold to Russia). I was thinking of simplicity and air cooling in a recip 4 stroke that doesn'...
  19. P

    Ultimate SI for u/l, EAB

    Sorry, assumed most people would identify SI with spark ign vs. CI for compression ign. I am firmly in the CI world, thus have to dust off a lot of old thinking to try to understand how things should fit in an SI world. Personally, 2 stroke cycles and other piston port (i.e. rotary) engines...
  20. P

    Ultimate SI for u/l, EAB

    Would like to hear from the UL guys, but I think both the 33 and 41 CID cylinders are a bit shy on HP to give 50 HP - but might get there at a bit higher RPM. Stroke on the 41 cylinders is right on the money. But, the radial configuration only works for a few airframes. Personally, I would...
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