Original Posted By: "DJ Vegh"
Need some help from the already flying guys.........The more I think of this the more it eludes me.When I first saw Mike Cuy's video of laying the smoke screen, it didn't seem realhow quick he was climbing. Now I see it's really so!I pull the plane back to 55 mph and I get an amazing 700fpm climb, I go up likean elevator. (just had to throw that in).Now I guess if you pull back farther, you will climb at a slower rate, BUT at asteeper angle to clear trees at the end of the runway. Now how do you calculatethis? Do you look down and time how far over the ground you go? Or howlong to get to the end of the runway? You can't simply use a stopwatch and timehow long it takes to get to a certain altitude at each speed, cause this isdoing the same as your "rate of climb"Help me here.waltNX140DL(north N.J.)ps still smiling, smiling, smiling!________________________________________________________________________________
Pietenpol-List: best angle of climb vs. best rate of climb
Re: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: "walter evans"
There's definatley a more precise way to get the number you're looking for,but if you already know your best glide speed you can take that figure andmultiply by 10% then subtract that amount from best glide speed.example... Vbg 50mph x 10% = 5 5 - 50 = 45mph Vx = approx 45mphthis is the quick and dirty way but will get you close.DJ Veghwww.raptoronline.com----- Original Message -----
There's definatley a more precise way to get the number you're looking for,but if you already know your best glide speed you can take that figure andmultiply by 10% then subtract that amount from best glide speed.example... Vbg 50mph x 10% = 5 5 - 50 = 45mph Vx = approx 45mphthis is the quick and dirty way but will get you close.DJ Veghwww.raptoronline.com----- Original Message -----
Re: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: "DJ Vegh"
DJ,this is the way to get best CLIMB angle?walt----- Original Message -----
DJ,this is the way to get best CLIMB angle?walt----- Original Message -----
Re: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: "walter evans"
yeah that formula works for Vx... best angle of climb. By all means it isnot the aerodynamic engineer's formula but a homebuilder's quick formula.Now I'm no engineer but in laymens terms.....Essentially, best glide is theoptimum lift/drag ratio speed. The best lift for the least amount of drag... relatively of course....So now, that speed (Vbg) might be considered Vx, but since we are underpower in Vx and power-off in Vbg, we've kinda faked the drag part of theequation by having thrust in there..... you can take about 10% of Vbg andsubtract it to get a close figure for Vx.Totally non-scientific explanation, but it really does work.There's a book out there that goes into great detail about the test flyingperiod and how to accurately determine all your V speeds. I forget heauthor, but it's a great and necessary read if you ask me.DJ Veghwww.raptoronline.com----- Original Message -----
yeah that formula works for Vx... best angle of climb. By all means it isnot the aerodynamic engineer's formula but a homebuilder's quick formula.Now I'm no engineer but in laymens terms.....Essentially, best glide is theoptimum lift/drag ratio speed. The best lift for the least amount of drag... relatively of course....So now, that speed (Vbg) might be considered Vx, but since we are underpower in Vx and power-off in Vbg, we've kinda faked the drag part of theequation by having thrust in there..... you can take about 10% of Vbg andsubtract it to get a close figure for Vx.Totally non-scientific explanation, but it really does work.There's a book out there that goes into great detail about the test flyingperiod and how to accurately determine all your V speeds. I forget heauthor, but it's a great and necessary read if you ask me.DJ Veghwww.raptoronline.com----- Original Message -----
RE: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Hi Walt,I did the same sort of tests with my old Cessna 140, because it had a verytired 85 hp Continental when I bought it and I was flying it out of a 2,000'strip with very tall trees at each end. I found a straight section of roadwith a couple of intersections about a mile apart. I started flyingparallel to the road, just off to one side at a constant airspeed (say, 70mph). When my forward strut crossed the first intersection, I noted thealtitude. I continued to climb at that speed, remaining parallel with theroad until my forward strut crossed the second intersection, when I notedthe altitude again. I then dropped back down to the initial altitude andrepeated the procedure, going the other direction, but with a differentspeed. This was done early in the morning, when the air was smooth andthere was no wind. With wind, you would have to fly both directions at thesame airspeed and average the two runs. After an hour I had severaldifferent runs, about 5 mph apart and could easily see which one gave me thebest climb over the same distance. I then narrowed it down by making runsonly 1 mph apart (at least I kidded myself into thinking that I could flythat accurately). I found that in that plane, with that airspeed indicator,my best angle of climb was at about 72 mph indicated.Have fun, I'm envious of you as I slog along doing systems work and tryingto get ready to start covering mine.Jack -----Original Message-----
Hi Walt,I did the same sort of tests with my old Cessna 140, because it had a verytired 85 hp Continental when I bought it and I was flying it out of a 2,000'strip with very tall trees at each end. I found a straight section of roadwith a couple of intersections about a mile apart. I started flyingparallel to the road, just off to one side at a constant airspeed (say, 70mph). When my forward strut crossed the first intersection, I noted thealtitude. I continued to climb at that speed, remaining parallel with theroad until my forward strut crossed the second intersection, when I notedthe altitude again. I then dropped back down to the initial altitude andrepeated the procedure, going the other direction, but with a differentspeed. This was done early in the morning, when the air was smooth andthere was no wind. With wind, you would have to fly both directions at thesame airspeed and average the two runs. After an hour I had severaldifferent runs, about 5 mph apart and could easily see which one gave me thebest climb over the same distance. I then narrowed it down by making runsonly 1 mph apart (at least I kidded myself into thinking that I could flythat accurately). I found that in that plane, with that airspeed indicator,my best angle of climb was at about 72 mph indicated.Have fun, I'm envious of you as I slog along doing systems work and tryingto get ready to start covering mine.Jack -----Original Message-----
Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: "The Huizenga's"
> Re: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: Mike Hardaway
Re: Pietenpol-List: best angle of climb vs. best rate of climb
Original Posted By: "Mike Hardaway"
yup.... as I said... it is by no means a perfect formula.... only a quickand dirty method of getting close.DJ----- Original Message -----
yup.... as I said... it is by no means a perfect formula.... only a quickand dirty method of getting close.DJ----- Original Message -----