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#1
October 22nd 06, 12:50 AM
posted to rec.aviation.ifr
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Percent power altitude
Jim Macklin wrote
5 and 7 thousand Running on (faulty) memory again, Jim? How about 7,500' and about 12,500', ISA of course. See my previous replies to this thread for a real chart answer. The formula answer is: bhp at altitude equals bhp at sea level times the quantity (density ratio minus the quantity(1 minus density ratio divided by 7.55)) Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. Bad information is worse than no information at all. Bob Moore 
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#2
October 22nd 06, 01:06 AM
posted to rec.aviation.ifr
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Percent power altitude
In article ,
Bob Moore wrote: The formula answer is: bhp at altitude equals bhp at sea level times the quantity (density ratio minus the quantity(1 minus density ratio divided by 7.55)) Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. OK, I'm confused. Full throttle, 64%, is 12,500' for any engine? How come my cherokee 140 couldn't even get to 12,500'? What am I overlooking? -- Bob Noel Looking for a sig the lawyers will hate
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#3
October 22nd 06, 01:26 AM
posted to rec.aviation.ifr
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Percent power altitude
Bob Noel wrote
Bob Moore wrote: Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. OK, I'm confused. Full throttle, 64%, is 12,500' for any engine? How come my cherokee 140 couldn't even get to 12,500'? What am I overlooking? :-) The wing, of course. :-) Bob Moore
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#4
October 27th 06, 11:26 PM
posted to rec.aviation.ifr
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Percent power altitude
Bob Moore wrote:
Bob Noel wrote Bob Moore wrote: Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. OK, I'm confused. Full throttle, 64%, is 12,500' for any engine? How come my cherokee 140 couldn't even get to 12,500'? What am I overlooking? :-) The wing, of course. :-) Bob Moore Perhaps you need to pedal faster? (*chortle*)
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#5
October 22nd 06, 06:07 AM
posted to rec.aviation.ifr
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Percent power altitude
Leaning and density altitude (performance altitude).
"Bob Noel" wrote in message ... | In article , | Bob Moore wrote: | | The formula answer is: | | bhp at altitude equals bhp at sea level times the quantity | (density ratio minus the quantity(1 minus density ratio divided by 7.55)) | | Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. | | OK, I'm confused. Full throttle, 64%, is 12,500' for any engine? | How come my cherokee 140 couldn't even get to 12,500'? | What am I overlooking? | | -- | Bob Noel | Looking for a sig the | lawyers will hate |
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#6
October 22nd 06, 04:09 PM
posted to rec.aviation.ifr
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Percent power altitude
Bob Noel wrote:
OK, I'm confused. Full throttle, 64%, is 12,500' for any engine? How come my cherokee 140 couldn't even get to 12,500'? What am I overlooking? Because 64% of whatever HP you have isn't enough to get you there/ hold you there. I've got 300HP in an airframe designed for 185. At 65% HP I'm doing better than they can do with WOT at sea level.
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#7
October 22nd 06, 06:06 AM
posted to rec.aviation.ifr
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Percent power altitude
Yes, after age 60, my recall gets muddy.
"Bob Moore" wrote in message . 122... | Jim Macklin wrote | 5 and 7 thousand | | Running on (faulty) memory again, Jim? | | How about 7,500' and about 12,500', ISA of course. | | See my previous replies to this thread for a real chart | answer. | | The formula answer is: | | bhp at altitude equals bhp at sea level times the quantity | (density ratio minus the quantity(1 minus density ratio divided by 7.55)) | | Works out to 76% at 7,500' and 64% at 12,500', or thereabouts. | | | Bad information is worse than no information at all. | | Bob Moore
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#8
October 22nd 06, 01:02 PM
posted to rec.aviation.ifr
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Percent power altitude
Jim Macklin wrote
Yes, after age 60, my recall gets muddy. Hmmmm....at 71, I must have missed that stage. :-) Bob
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#9
October 22nd 06, 05:24 PM
posted to rec.aviation.ifr
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Percent power altitude
Note, I did say MY recall. I sleep like a baby now. Go to
bed, wake up every hour or two, cry and go to the bathroom. I my defense, I'm not perfect. "Bob Moore" wrote in message . 122... | Jim Macklin wrote | Yes, after age 60, my recall gets muddy. | | Hmmmm....at 71, I must have missed that stage. :-) | | Bob |
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