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  1. Key200

    No Net Force on a Centrifugal Impeller? Really Puzzling

    IRstuff, thanks! So it appears that I can apply the force calculation in this situation. Good, well, the thing however is that tests carried out on impellers did barely show any net forces at all(i.e. perpendicular net force to the impeller surface as seen in the previous pictures uploaded)...
  2. Key200

    No Net Force on a Centrifugal Impeller? Really Puzzling

    Hi again Yes it is a blower, used as an example. My question relates to centrifugal impellers in general. It seems my question is misinterpreted. I am not a student. My question as said earlier dealt with the lower pressure created by the increased velocity on inlet surface. The...
  3. Key200

    No Net Force on a Centrifugal Impeller? Really Puzzling

    Hi, I uploaded a picture, The outlet is not closed. It is just away from the inlet as to not interfere or recirculate with the inlet flow. The assumed centrifugal fan is rotating just like in any centrifugal blower like in the picture, thereby a strong suction pressure/low static pressure...
  4. Key200

    No Net Force on a Centrifugal Impeller? Really Puzzling

    Hello! I am not sure if I understand the point you are trying to make? I am aware of both gentlemen :) and you are absolutely correct, Newton has a much easier name to spell hehe. Also, Newton always apply everywhere. How it applies is of course depends on many factors. Anyway, perhaps...
  5. Key200

    No Net Force on a Centrifugal Impeller? Really Puzzling

    Hi everyone! I have seemingly a very simple question regarding centrifugal fans/blowers and really thought that you here might be able to answer considering your experiences in the area. We all know a centrifugal fan/blower has a very low pressure in the center where suction occurs...
  6. Key200

    Power loading vs the percentage increase of total static thrust in a ducted prop with a lip?

    Thanks, sorry, I changed that now. .... Indeed the ducted fan has a relatively low efficiency but what about big ducted propellers/rotors? The thrust of all low-disc area high-powered systems can be doubled or more by installing a suitable ductlip but of course as you know the original...
  7. Key200

    Power loading vs the percentage increase of total static thrust in a ducted prop with a lip?

    Hi! Just want first to say I am not a complete beginner in aerodynamics. I have been searching for an answer to this question I have had for a while now w/o luck. Will you still get huge benefit of huge added extra lift force from the duct lip even if you have huge power loading...
  8. Key200

    Big Peripheral Rotor-Bearing, practical?

    Thanks for you inputs everyone,. The whole point of this was originally to make the rotors as rigid as possible, without having to make the rotors very heavy carrying this huge inertia that is metallurgically/structurally very complex and dangerous IMO. My line of thinking was rather having the...
  9. Key200

    Big Peripheral Rotor-Bearing, practical?

    Thanks for the reples. Indeed I agree too about eh added weight and complexity. Yes 3DDave, the whole reason behind this idea is to have very rigid rotors without having very high stresses point(like blade root) or very heavy rotorblades. Such a bearing seems to me the only method of having...
  10. Key200

    Big Peripheral Rotor-Bearing, practical?

    Hi everyone, this is my first post here, so please feel free to move this to another section if this is an inappropriate one, Im really not sure whether this question belongs more to rotorcrafts or mechanical engineering section. I am by no means a huge expert in absolutely all rotorcrafts´...

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