normb@tekred.UUCP (Norm Babcock ) (04/18/85)
After reviewing the C-152 handbook, the significance of the heading of the table I get rate-of-climb, fuel, distance, etc., from for various altitudes, hit me. The heading is for MAXIMUM rate of climb. Even though I make a stab at calculating this and that, correcting for temp, the actual performance is always less. I figured out then,(or remembered), that I don't like the deck angle at max climb, and always lower the nose for better visibility and cooling. My question is: is there a correction factor which works for different climb speeds? Is climb performance linear with speed? ROC would decrease, fuel would increase, time to TOC would increase, as would distance to TOC. Or does one have to play test pilot and make new tables? I realize a lot of pilots gas and go; and I do also, but sometimes I like to do a precision nav flight just for kicks. I would like to get a little better at forecasting a/c performance. Any ideas? tektronix!tekred!normb
cfiaime@ihnp4.UUCP (Jeff Williams) (04/18/85)
> My question is: is there a correction factor which > works for different climb speeds? Is climb performance linear with > speed? ROC would decrease, fuel would increase, time to TOC would > increase, as would distance to TOC. Or does one have to play test > pilot and make new tables? > > Any ideas? > As a rule of thumb, add one mile of enroute distance for each 1000 feet of climb. As an example, if your distance is 100 miles, and your climb is 5000 feet, figure time, fuel burn, and the like for a trip of 105 miles. This trick works best for cruise climb, and is accurate to 1 minute or so and 1 or 2 gallons. Many precision pilots use this trick. However, if you like playing test pilot, you can probably, in enough flights, build your own tables for your own technique. jeff williams AT&T Bell Laboratories ihnp4!cfiaime
notes@ucf-cs.UUCP (04/21/85)
Unfortunately ROC is nonlinear with speed for a fixed altitude & wt. ROC is proportional to excess power ie differecce between what your engine is putting out at your power setting and the power needed to overcome drag. Its max at about middle of the white arc speeds. Remember also that book figures are one by factory test pilots on new airplanes at gross wt at sea level or corrected to sea level. There is a way of performing an entire climb performance check in a 1/2 hour flight with on board instruments. Send mail if you wish to know how. Good Flying. .