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  1. M

    Distributed Electric Propulsion

    Aircar - since you know my name, why don't you tell me yours? I'd like to go back and see our prior discussions. Almost all that you have been saying is completely off topic, and quite inaccurate - I've worked at NASA 30 years and led the efforts that you're discussing and you simply don't...
  2. M

    Distributed Electric Propulsion

    Aircar - have we met before? I honestly have no idea who you are so you have me at a disadvantage. As I said, if you'll stick to a specific technical issue - I'll be happy to address it. But you have this tendency to ramble in strange conspiratorial tones - and it tends to make people not...
  3. M

    Distributed Electric Propulsion

    A bunch of good questions... Concerning Oshksoh, no we won't be presenting. I would have liked to so that I could hear feedback from the pilot and sportplane community. Sometimes they think of things we haven't thought of. I will be present on Thur and Fri next week, as Airbus is sending out...
  4. M

    Distributed Electric Propulsion

    Excellent question. They will be interconnected, but we have yet to design to what degree and exactly how. There are many advantages to an interconnected system, but the question is to what degree and how complex that makes the wiring paths and other bus management issues. If the tip...
  5. M

    Distributed Electric Propulsion

    Regarding the de-icing issue there is great potential to use that waste 5 to 7% of power heat to help. However, we only have those motors active in in the low and slow portion of flight. So I'm not sure how effectively this will meet de-icing needs. There are a lot of permutations to this...
  6. M

    Distributed Electric Propulsion

    I answered the redundancy/controller question already from the other post. Your cost question is something we care a great deal about as we're not merely trying to provide advanced technologies for new aviation products, but also provide an incentive for early adoption of this new technology -...
  7. M

    Distributed Electric Propulsion

    Yes we are using a CAN bus on the initial test this year. We'll see how well it works in terms of letting us talk to all of the motors, a CAN bus is essentially a network that lets each Engine Speed Controller talk to the others (without a host server). NASA Armstrong is doing this work and...
  8. M

    Distributed Electric Propulsion

    The Aviation Week article is now available on line without a subscription for those interested in reading that article. NASA Plans Tests Of Distributed Electric Propulsion | Commercial Aviation content from Aviation WeekNASA Plans Tests Of Distributed Electric Propulsion | Commercial Aviation...
  9. M

    Distributed Electric Propulsion

    You are a bit presumptuous aren't you :) It would be better to phrase this as a question instead of a statement please. Of course we were well aware of this characteristic. But you aren't taking into account the new degrees of freedom present. We can vary the spanwise distribution of power...
  10. M

    Distributed Electric Propulsion

    You are very insightful - we hadn't thought about this, until we saw the results from our initial wind tunnel test. If you look at the CTOL/STOL/VTOL slides I sent, you'll see on slide 9 that I discuss exactly this characteristics that we pleasantly discovered. Typically with advanced concepts...
  11. M

    Distributed Electric Propulsion

    My answer relating to this question is incomplete - we haven't done the testing to prove our point. But I don't think that is a high risk area. The nacelles will have indentations for conformal stowing (in fact we will likely have them partially recessed to instead insure tripping the flow...
  12. M

    Distributed Electric Propulsion

    Thanks for suggesting renaming, I should have thought of that. I've attached 2 .mov files that are renamed as .pdf. The first is the SR-22 (like) single prop with 300 hp, the 2nd is 300 hp going into 20 15 hp low tip speed props with frequency spreading. Your analogy of the full auto mode vs...
  13. M

    Distributed Electric Propulsion

    OK, I'm going to go out on a limb and share something really cool with you relevant to this post (because we just did this work). This is exactly correct that we run each motor/prop at slightly different speeds to spread out the harmonics (which are now dramatically smaller because we have 20...
  14. M

    Distributed Electric Propulsion

    Exactly! I think you've got it right. Let's see what happens with F44. Just today we spent several hours with the FAA guys doing this talking about the new climb language. I'm hopeful, but it will take time. Their intents are in the right place, and it is the first chance for a complete...
  15. M

    Distributed Electric Propulsion

    So much to comment on... yes, I know all these people very well - Dennis and I chat almost daily, as I do with Todd. This concept is not about VTOL, but the same Distributed Electric Propulsion could definitely be used for VTOL concepts (as we have done at the UAV scale). I believe that if we...
  16. M

    Distributed Electric Propulsion

    We're going to have to simply disagree. Community noise is all about down low. Even if you're going 50 miles you would still cruise at 4000+ feet, and then noise is not nearly the same issue. Plus - are you kidding me? You're saying we making a grown man cry by spinning up to 700 ft/sec -...
  17. M

    Distributed Electric Propulsion

    We're already talking to the FAA about how this aircraft can be certified, and their response has been quite positive. Currently Part 23 rules are being rewritten into ASTM Consensus Standards as part of the F44 committee. This provides a great opportunity to establish the new regs to accept...
  18. M

    Distributed Electric Propulsion

    You've misunderstood. Our prop tip speeds are designed for 450 ft/sec (not 400) at the low speed condition. The Puffin rotors were designed for this same tip speed in hover (but is a VERY different prop-rotor design). I'm not sure where you got the information that the Puffin blades were...
  19. M

    Distributed Electric Propulsion

    I love it when I can do the impossible! :) This shows the power of firmly entrenched assumptions, many have real difficulties looking beyond them because they are so accustomed to what they currently have. The key difference is that with electric motors we don't have to keep the same rpm (or...
  20. M

    Distributed Electric Propulsion

    Here are two papers that we presented 2 weeks ago. These papers offer much more specific discipline results than my general presentation. One paper describes the aero-propulsive CFD analysis that we performed which is the basis of our 5.6 CLmax claim. The other paper goes into detail on the...
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