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    #46
    Babylon...lets be go back to what I orginally said in post #22..
    Originally posted by Hawkeye
    Folks dont relise...that jus because your static thrust is greater than the weight of the plane does not mean it will do a unlimted vertical...

    As your plane moves...the thrust actually drops.....your drag increases at the square of the velocity.....so your reduced thrust has to overcome both the weight of the plane and the drag induced by the plane moving....when all things come to an equilibrium....your acceleration is 0...your velocity stabilises and sort of hits terminal.

    Thrust = weight(mass x grav const) + (Drag Coef x Velocity^2) ...only applies to a vertical climb at 90deg.

    So you have to determine your thrust when the plane is moving in order to determine if you will get unlimtied vertical...food for thought....

    Thats my orginal statement and I stand by it as its the laws of physics....if you dont believe me...pull out a text book.

    Let me rebutt your pointers in you last reply

    YOU SAID 1.)In the pusher as the plane climbs vertically, and depending on the thrust , the plane would continues upwards. As it loses speed the airflow over the control become weak to a point where the control surface it no longe become effective.
    (In a vertical climb , wing of the plane has practically no lift in this scenario, it is power by raw thrust and momentum)
    MY QUESTION: So how did the plane lose speed as you descibed here?? pls enlighten

    YOU SAID: 2) In this situation , the plane become unstable and start to wobble and slip out of its flight path. The laminar airflow over its airfarme start to break up and induce drag causing the aircraft to slow down further.
    I SAY: I agree with you as the the boundary layer seperates from the surface, the pressure differential betweenthe front and back of th plane increases. Hence drag increase.

    3) The induce drag further slow down of the aircraft and situation becomes even more unstable , vicious cycle. I SAY: I agree

    4.) By this time the aircraft would have slow down till the control surface control is no longer operative.I SAY: I agree..happens to tractors and pushers

    5.) The aircraft is now upright and represent an object with a tall profile and is at the mercy of gravational forces ...very unstable will fall back to mother earth.
    I SAY: True...happens to all planes.

    But back to point 1....WHY did the plane slow down in the first place???

    Babylon,

    Read the thread again from post #22

    1. No one is commenting anything bad about your plane and its setup. Its a good plane and it flies well.
    2. Im stating a fact backed by the law of physics in post #22. Its like any law...V=IR, F = MA, E= MC^2
    3. Your disagreement about the amount of drag on your plane is debatable, only can be measured in a wind tunnel.
    4. You probably did not get the point about the thrust reduces as velocity increases. Which probably caused you some misunderstanding on your part of what I was trying to explain in post #22...hence you focused only on the drag part.
    5. When you state possible unlimted vertical or ...I think its fair that other experienced and knowledgeable flyers challenge you. They have a right. But Im not challenging that statement you made

    Where Im challenging you is in your post #24 where you state

    You mentioned:
    ******************
    Hawkeye, theorectically if you have 1: 1 thrust the plane should hover and remain stationary, the drag component will then become zero at stationary(equilibrium).
    If you exceed the thrust to weight by as much as 20% , the plane would continue to climb vertically theorectically unlimited.
    *******************

    I find this statement somewhat misleading and inaccurate. .....And I think it fair for others to challenge your statement and set the record straight...
    Do you feel the RUSH....!!!!

    Comment


      #47
      Originally posted by Hawkeye
      Babylon...lets be go back to what I orginally said in post #22..



      Thats my orginal statement and I stand by it as its the laws of physics....if you dont believe me...pull out a text book.

      Let me rebutt your pointers in you last reply

      YOU SAID 1.)In the pusher as the plane climbs vertically, and depending on the thrust , the plane would continues upwards. As it loses speed the airflow over the control become weak to a point where the control surface it no longe become effective.
      (In a vertical climb , wing of the plane has practically no lift in this scenario, it is power by raw thrust and momentum)
      MY QUESTION: So how did the plane lose speed as you descibed here?? pls enlighten

      YOU SAID: 2) In this situation , the plane become unstable and start to wobble and slip out of its flight path. The laminar airflow over its airfarme start to break up and induce drag causing the aircraft to slow down further.
      I SAY: I agree with you as the the boundary layer seperates from the surface, the pressure differential betweenthe front and back of th plane increases. Hence drag increase.

      3) The induce drag further slow down of the aircraft and situation becomes even more unstable , vicious cycle. I SAY: I agree

      4.) By this time the aircraft would have slow down till the control surface control is no longer operative.I SAY: I agree..happens to tractors and pushers

      5.) The aircraft is now upright and represent an object with a tall profile and is at the mercy of gravational forces ...very unstable will fall back to mother earth.
      I SAY: True...happens to all planes.

      But back to point 1....WHY did the plane slow down in the first place???

      Babylon,

      Read the thread again from post #22

      1. No one is commenting anything bad about your plane and its setup. Its a good plane and it flies well.
      2. Im stating a fact backed by the law of physics in post #22. Its like any law...V=IR, F = MA, E= MC^2
      3. Your disagreement about the amount of drag on your plane is debatable, only can be measured in a wind tunnel.
      4. You probably did not get the point about the thrust reduces as velocity increases. Which probably caused you some misunderstanding on your part of what I was trying to explain in post #22...hence you focused only on the drag part.
      5. When you state possible unlimted vertical or ...I think its fair that other experienced and knowledgeable flyers challenge you. They have a right. But Im not challenging that statement you made

      Where Im challenging you is in your post #24 where you state

      You mentioned:
      ******************
      Hawkeye, theorectically if you have 1: 1 thrust the plane should hover and remain stationary, the drag component will then become zero at stationary(equilibrium).
      If you exceed the thrust to weight by as much as 20% , the plane would continue to climb vertically theorectically unlimited.
      *******************

      I find this statement somewhat misleading and inaccurate. .....And I think it fair for others to challenge your statement and set the record straight...
      Right, we have differing views like I am not convince or buy your theory on drag ...Are you sure your very own statement is correct???? Is it fair to others as well?

      Yes debate or settle an argument as gentlemently as possible but I find it not the case.

      I have not make any ill comment in any of your thread or twist your statement and change to another "words" that befit an agenda or call the person "misleading statements "

      As far as I am concern I find your statement rather caustic .


      Just too bad if we have differing views and opinnion.

      ... and too bad my statement " Unlimited vertical is possible with this setup" cause you to go ballistic.


      I find no point in debating with you.

      You stick to your theory and I stick to mine.
      We go seperate ways.

      Comment


        #48
        Frankly speaking, I think your statement is misleading too. From the way I saw your plane flew this morning, " Unlimited vertical is possible with this setup" is only valid if your definition of unlimited vertical is 20-30metres high. You may say that you don't have your best, most powerful batteries this morning and as such, you didn't pull an unlimited vertical climb. Did you see my ElectroStreak this morning? From level flight, I can pull it up till I have to quit climbing as I can't really see it well. To me, that's my definition of unlimited vertical. It's the 1st time I brought the ElectroStreak that high, thanks to Hawkeye who lent me his prop and gave me his assured opinion that that plane can go balistic with that prop.

        Oops, sorry. I broke my promise not to comment on your "findings" but I find that the statement is misleading to newbies when they goes to the EDF route. My bad. I go

        Comment


          #49
          I agree...You stick your views and opinions...I stick to the law of physics.
          Do you feel the RUSH....!!!!

          Comment


            #50
            Originally posted by joe yap
            Unlimited vertical? Try helium filled baloon instead...........
            but but but.. helium ballon also not unlimited ley...

            highest recorded was 38,100 meters?

            oohh. sorry.. back to the topic?

            I trust what I saw at the field. who edf's is blowing more cows than air.... for months all whom visited jw can see with our own eyes, and choose to keep silent for friendship sake. Many folks whom ain't that new, or knows his physics can also figure out without visiting the field.

            each man has its own cup of tea.

            let's move on and close this chapter.

            cheers
            huh

            Comment


              #51
              Some may like coffee, some may like cocoa. Why must you mention only tea??

              Originally posted by nic
              but but but.. helium ballon also not unlimited ley...

              highest recorded was 38,100 meters?

              oohh. sorry.. back to the topic?

              I trust what I saw at the field. who is edf's blowing more cows than air.... for months all whom visited jw can see with our own eyes, and choose to keep silent for friendship sake.

              each man has its own cup of tea.

              let's move on and close this chapter.

              cheers

              Comment


                #52
                Originally posted by $h@d0w
                Some may like coffee, some may like cocoa. Why must you mention only tea??
                because I cheena, so I drink cheena tea mar..

                let's go grab a cuppa @ our favorite café. hene
                huh

                Comment


                  #53
                  Okie. Back to topic.

                  Comment


                    #54
                    Originally posted by nic
                    because I cheena, so I drink cheena tea mar..

                    let's go grab a cuppa @ our favorite café. hene
                    Wanna try English Tea

                    Comment


                      #55
                      Earl grey please...
                      Do you feel the RUSH....!!!!

                      Comment


                        #56
                        Originally posted by $h@d0w
                        Frankly speaking, I think your statement is misleading too. From the way I saw your plane flew this morning, " Unlimited vertical is possible with this setup" is only valid if your definition of unlimited vertical is 20-30metres high. You may say that you don't have your best, most powerful batteries this morning and as such, you didn't pull an unlimited vertical climb. Did you see my ElectroStreak this morning? From level flight, I can pull it up till I have to quit climbing as I can't really see it well. To me, that's my definition of unlimited vertical. It's the 1st time I brought the ElectroStreak that high, thanks to Hawkeye who lent me his prop and gave me his assured opinion that that plane can go balistic with that prop.

                        Oops, sorry. I broke my promise not to comment on your "findings" but I find that the statement is misleading to newbies when they goes to the EDF route. My bad. I go
                        I am not surprise by your statement,
                        It is just your one man opinion.
                        In the evening I flew the plane in a steep vertical climb out.
                        One guy ask me ,are you using a Wemotec Fan and another ask me are you using Thunder power Lipos. I open the plane hatch and show him the batteries ...just plain cheapo batteries. The challenge ain't over yet.
                        Wait till I put a pair of "good" lipos then we will see what this setup can do, then you would wish you would have kept your promise of not comment on my plane in future.

                        Comment


                          #57
                          OK la lets end this here as the debate goes no where. Any plane when equipped with the rightly matched power system will fly really well...If you are happy with your setup thats all that matters reagardless of what others say about it. If anyone wants better performance than what he currently has...there are 2 ways to go..

                          1. Fine tune the setup with what ever you already have
                          2. or match the right power system to the desired performance...and you dont have to get expensive stuff to do that. You can afford the best stuff but if you dont know how to match Airframe to motor to prop to battery and esc..its quite pointless have the "Good" Stuff.

                          So lets all go to the coffee shop and drink tea and coffee and what ever else turns us on....
                          Do you feel the RUSH....!!!!

                          Comment


                            #58
                            Haha, no worries. People can see and read for themselves. If you are so confident, go to other fields and show to the rest of them you 'possible unlimited vertical'. I think there was an invitation for you to go to PFW and show to them. Please don't say that the field is too small for your plane. If can means can.

                            Ok, I'll end here too. I'll know you'll like to have the last words since it's your thread. Good luck to your endless quest for low current consumption, cheap setup, high thrust, high speed, high climb rate and unlimited vertical with EDFs.



                            Originally posted by Babylon5
                            I am not surprise by your statement,
                            It is just your one man opinion.
                            In the evening I flew the plane in a steep vertical climb out.
                            One guy ask me ,are you using a Wemotec Fan and another ask me are you using Thunder power Lipos. I open the plane hatch and show him the batteries ...just plain cheapo batteries. The challenge ain't over yet.
                            Wait till I put a pair of "good" lipos then we will see what this setup can do, then you would wish you would have kept your promise of not comment on my plane in future.

                            Comment


                              #59
                              why nobosy ask for chinese tea?
                              i'm a rc sotong. And i know nuts about it.

                              Comment


                                #60
                                Originally posted by $h@d0w
                                Haha, no worries. People can see and read for themselves. If you are so confident, go to other fields and show to the rest of them you 'possible unlimited vertical'. I think there was an invitation for you to go to PFW and show to them. Please don't say that the field is too small for your plane. If can means can.

                                Ok, I'll end here too. I'll know you'll like to have the last words since it's your thread. Good luck to your endless quest for low current consumption, cheap setup, high thrust, high speed, high climb rate and unlimited vertical with EDFs.


                                Ha ha, Looks like you haven't learn from your previous encounter with me on the electra jet.
                                I can see why anyone can manipulate you to just let you see what they want you to see . You report what you see and if you don't get to see you don't report right.
                                Beside watching and observing did you actually ask for more detail...I don't think so.
                                No wonder its so easy for anyone to fool you and just let you see what they want you to see.

                                Comment

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