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Real Prop Thrust, piston engine

lionheart

lionheart

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us-arizona
Hey guys,

I am browsing around online and trying to find out what the approximate thrust is for a small 4 seater planes would be. For instance, a 180 HP, 2 bladed prop Cessna. What would the cruise and max 'pounds / thrust' be with that much power and a 2 bladed prop?



Bill
 
I went on a hunt again today, found some data this time. Why I suddenly find data now and didnt then, I'll never know. I have the worst luck sometimes doing searches for information.

Some prop tests done by a Chinese facility found that a Cessna 172, 150 HP, 2 bladed McCauley (xxxx) prop gave a 32KG / 211KG thrust rating, 70lbs / 465 lbs. I found another test recorded online with different prop tests and they peaked at 625 to nearly 800lbs, but not up to 800lbs. This includes 3 bladed exotic props with spinners which helped the performance figures.

So.... 70lbs static, and 465lbs top out, maximum power. Very interesting to know.
 
I am guessing your numbers are a bit high.

Considering we are all in a Flight Sim forum, have you thought about using Jerry Beckwith's very excellent test gauges to see what your simulator setup gives with a similar aircraft?
It is a bit of a circular way of doing things in taking a number from a simulator to do calculations presumably to build a simulator aircraft.

Another possibility and probably the better one is to get propeller efficiency tables from one of the prop manufacturers and plugging in the values you know about. I am guessing it will tend a bit high also because efficiency will drop a bit in a real life installation with all the interference drag of the cowl, etc.

As you can see, I really didn't give you an answer and am a bit too lazy to do all the wandering around to gather information which this answer would need. This procedure but lack of answer is why I didn't post a response earlier.

Hope this helps.
- Ivan.
 
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