![]() He says keeping true airspeed constant because the higher you go the indicated air speed decreases because the air density decreases at the same true airspeed.įor example in Ta152H1 top speed is 750kph true airspeed at 12500m but that is just 381kph indicated airspeed.Īnd because indicated airspeed decreases even at higher true airspeed induced drag increases the higher you go. Posting airfoils is interesting but has nothing to do with the topic of this thread or the current top speed discussion because you focus on certain aspects without assessing their impact in the overall picture.Įdited Januby Uncle J - idk what drives you, but you should try to see the whole picture and to use more common sense. I mean at a certain point or level an exchange becomes point- or useless. So, you or a specific other participant can post whatever kind of information you want, as long as you not try to see the overall picture and focusing on small aspects. Just by logic, because at a certain alt there is no drag left and just gravity and engine power available are decisive.Īnd if i search long enough i will find a study that proves that aeronautical engineers have in the overwhelming cases 2 legs, proving statistically that everybody with less than two legs is by definition not qualified to assess this stuff, and statistically you and I have less than 2 legs.īut this won't be fair or suited to have a serious discussion, so i will not argue like this. The higher you are, the more relevant that induced drag is: If i would use the same approach as you, i would claim that this quote: I found a very simplistic graph to prove my claim: And your example can be easily used to counter your point just by using logic. ![]() So just from a pur logical point of view you are out - as you picked out a single sub-aspect of 1 out of 3 decisive factors - which have always to be seen as part of an overall package. Btw i can use the same example to prove my claim was right, alone due to the fact the plane was slower at lower alt. And the GM-1 was there t o increase power available for the Ta 152s on very high alt, this is nothing new. So, if you pick out one subpart of the 3 decisive factors out of the equation and come with an example like the Ta 152 and limiting/qualifying your own claim with this: "Keeping true airspeed constant." it has not really anything to do with the topspeed issue, because the main topic of the last 20 posts is and was to increase topspeed. It is logic that my claim is not applicable when engine power available decreases, that's one of the reasons why planes get slower above certain altitudes as overall drag increases. And as you have seen i was precise and limited my claim to induced drag, as this was the major point of the previous posts. If i claim for the topspeed issue "The faster and higher you fly the induced drag of the wings becomes less relevant" it is logical that they have to be seen both togetherwith engine power available, as this engine power allows you to pick up speed and climb. And we are talking here about props fighters, to be more precise, purpose-built prop fighters. We are talking about topspeed of fighters, strongly depended on overall aerodynamics, air pressure and engine power available. The higher you are, the more relevant that induced drag is:ĭude - idk what drives you, but you should try to see the whole picture and to use more common sense. ![]() The faster and higher you fly the induced drag of the wings becomes less relevantįor altitude, it is the other way around.
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