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Static thrust for Sonex with 54" prop
The Aero-Vee engines seem to be working out okay, but since they weigh
at least 160lbs, they might seem a bit heavy for the thrust produced. They supposedly make 80hp at 3400 rpm. It matters little how much HP they make, what matters is how much thrust is applied to the aircraft. You could have a 200hp engine on a Sonex, but trying to dump it into a 54" prop turning 3400rpm would give you very little more thrust. IOW, the props are less and less efficient as they turn faster, get smaller, and use pitch to load up the motor. Another downside is that when props turn much more than 2600 rpm they start getting noisy. How much static thrust does a Sonex built according to plans have with either an Aero-Vee or a Jabiru 2200? With a 72" prop turning at 2600 rpm, I would think 80 hp would make 500-600 lbs. I wonder what 80 hp into 54" at 3400 rpm would make? |
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Static thrust for Sonex with 54" prop
Mel wrote: ... How much static thrust ... I can't imagine any answer that would be of any value to any purpose unless your goal is to lock the brakes and use the prop blast to sweep out your hangar. Thrust while static is of no practical use. I'd think that thrust while in motion might be more enlightening. Daniel |
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Static thrust for Sonex with 54" prop
wrote in message ps.com... Mel wrote: ... How much static thrust ... I can't imagine any answer that would be of any value to any purpose unless your goal is to lock the brakes and use the prop blast to sweep out your hangar. Thrust while static is of no practical use. I'd think that thrust while in motion might be more enlightening. Daniel The one place that static thrust is of interest is a glider tug - you need to get things moving before the glider wing drops. Bildan |
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Static thrust for Sonex with 54" prop
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