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  1. R

    Saunders JetHawk...Any builders?

    I've actually been looking for a good squirel cage fan :-) I'm doing all kinds of energy saving/ producing things to my girl friends house. One idea I've already validated,...putting a fan in the attic during the winter,...and blowing the warm solar heated air into the house. Free,..almost heat...
  2. R

    Saunders JetHawk...Any builders?

    That is my opinion; what I favor is using a section of stainless steel honey comb in a cylindrical shell. THe exhaust would enter a volute manifold,...to evenly distribute the exhaust through out the honeycomb. The exhaust would heat the honeycomb,...and then is leaked between honeycomb cells...
  3. R

    Saunders JetHawk...Any builders?

    Serge,... I ran two cases: Sea Level max speed: Pressure ratio of 1.15, Flow = 36 lbm/ sec corrected flow I kept lowering flat plate area to reach 460 mph. I also ran a case for using the waste heat of the engine to boost enthalpy and thrust. At Sea level you can go 460 mph with 380...
  4. R

    Saunders JetHawk...Any builders?

    Serge,... I'll run my aircraft deck,...with my current fan flow,...and PR,....vary the flat plate area that gives that speed. I'll just use max VFR altitude 18,000 feet,...and tell you the thrust and the hp required. Now as to the "mixed-mode" fan,...I have an idea of what that...
  5. R

    Saunders JetHawk...Any builders?

    For the speeds,...(300 mph) we're talking about,...but more importantly the pressure ratios we can achieve with an auto-engine rpm,...6,000 continuous for a Mazda rotary, a variable inlet or exit would most likely not be worth the weigh penalty, cost, etc. Remember,...every "add-on-trick" must...
  6. R

    Saunders JetHawk...Any builders?

    That is "correct" but incomplete. The exit area of the propulsion system is the mass flow throttle "so to speak". In a static thrust condition,...there is no spillage drag obviously,....the converging duct does not inhibit operation. But the flow is also controlled by the exit area. If you keep...
  7. R

    Saunders JetHawk...Any builders?

    Take these one at a time I guess. 1) 250 kts; there is one design on what is technically a shrouded prop,...I know the designed very well,...he ran it,...and got the thrust numbers he was predicting,...essentially,...it was a hoop with the blades centrifugally loaded. As I talked to him about...
  8. R

    Saunders JetHawk...Any builders?

    "I'd love to hear some more informed opinions on a convergent vs divergent inlet performance for a ducted fan." I worked as a project Engineer at Pratt & Whitney for 5 years. Worked with some of the best compressor aerodynamics folks in the world. Learned streamline analysis from them etc...
  9. R

    Saunders JetHawk...Any builders?

    Actually,...."I read" somewhere,..mid-90s I think,...that several were started,...maybe 5 or 6,...reached various levels of completion and not flown,...exept one (other than the original). The guy flew it,....was very disappointed,...mainly cuz of the fan inefficiency. THe plane is a real...
  10. R

    Test footage of my ducted fan

    This fan has a 19.5 inch diameter. It could be scaled to up or down however
  11. R

    Saunders JetHawk...Any builders?

    I hate to sound brash or abrupt,...but the Mass Flow guys are flat wrong period. They have experience with ducted props,..shrouded props etc. Dirigible(sp?) vectored thrust devices which are only "useful" at static to low air speed. You need a diffuser for a fan-jet designed to operate at any...
  12. R

    Saunders JetHawk...Any builders?

    I do not,....when I left there long ago :-) it was conceptual,...I have not kept up with where it is now. Lots of cool features though,...thrust reversing fans blades,...less noise,...high efficiency,...low fuel consumption.
  13. R

    Saunders JetHawk...Any builders?

    The problem is "the propulsion system". There are "shrouded propellers" which is essentially what the "Mass Flow" folks are advocating. The inlet system for those type fans is only good for low speed 100 mph etc. For a "true fan" like what's on a high bypass turbo-fan,...you need a diffusing...
  14. R

    Test footage of my ducted fan

    Yes indeed. HAve we met? At Sun & Fun maybe?
  15. R

    Test footage of my ducted fan

    The design point is a Pressure ratio of 1.1 to 1,...with a 30 lbm/sec flow. That works out to about 390 lbf static thrust. The fan has considerable over speed capability which,..if more HP were available could produce substantially more thrust,...like about 600+ lbf with 350 odd hp.
  16. R

    Test footage of my ducted fan

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