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Luftwaffe and Axis Air Forces Please use this forum to discuss the German Luftwaffe and the Air Forces of its Allies. |
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#31
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Re: Why Didn't Late Generation LW Fighters Use Four Blade Props?
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-why did they keep the utterly inefficient Maybach petrol engines for tanks? -why was German large surface warship steam machinery noted for its poor efficiency??? Short answer: K´s theory is fatally flawed.
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"No man, no problem." Josef Stalin possibly said...:-) |
#32
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Re: Why Didn't Late Generation LW Fighters Use Four Blade Props?
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Last edited by George Hopp; 11th November 2006 at 05:04. |
#33
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Re: Why Didn't Late Generation LW Fighters Use Four Blade Props?
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I just recently had to purchase a new propeller for my aircraft. In speaking with numerous prop shop's some interesting insight to the German Engineer's decision to stick with 3 blades instead of 4 came to light. I wanted to put a 3-bladed STC'd prop on my aircraft. Surprisingly not one prop shop recommended it nor did the company engineer's. The first question asked was, "How do you fly the plane?” As I do not fly above 18,000 ft ASL, the answer was to stick to the 2 bladed props because they offered the best performance in the envelope I used the aircraft. As we all know props are extremely complicated pieces of engineering. Generally speaking the performance differences on the same airplane can be summed up as follows: Adding more blades will increase high altitude cruise speeds, Vy, higher top end acceleration, and high altitude level speed on the aircraft. However at lower speeds the more blades you add, the more blade interference decreases the propeller efficiency. So for lower stall speeds, better Vx, faster low altitude speeds, and better low end acceleration, you will find fewer blades is generally the better choice. To clarify: Vy = Best climb rate or the greatest gain in altitude over a given time. Vx = Best climb angle or the greatest gain in altitude over a given distance. All the best, Crumpp |
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