Original Posted By: owner-pietenpol-list-server(at)matronics.com
To:Subject: RE: Pietenpol-List: Take off rollI can usually get off the ground in about 400 feet. 150 feet might bepossible with a 30 knot wind down the runway.Getting off the ground is not a problem with a Pietenpol. The problemcomes when trying to climb over 120 foot trees at the end of the runway(nobody ever told the trees in North Carolina that they are onlysupposed to be 50 feet tall). On a hot day, my rate of climb with a passenger is about 150 fpm.Assuming that it is moving forward at 50 mph (73 feet per second), andassuming I get off the ground after a 400 foot roll, that means I've gota little under 1 minute to climb high enough to get over the trees atthe end of the runway. To be generous, let's say the trees are only 100feet tall, so now I've got 40 seconds of flying time to get over thetrees. In that 40 seconds I will travel 40 x 73 or 2,920 feet. Problemis, the runway is only 2500 feet long and I've already used 400 feet ofit before getting off the ground.Solving the problem another way, if I take 400 feet to get off theground and then travel at 73 feet per second while climbing at 150 fpmfor the remaining 2100 feet of runway, I will be 71.92 feet high at theend of the runway, or will impact the trees 28 feet below the treetop.Hence my decision to not carry passengers out of my home field in thePietenpol.Jack PhillipsNX899JP-----Original Message-----
Pietenpol-List: "moth" wing tank
Pietenpol-List: "moth" wing tank
Original Posted By: Steve Eldredge
Hello,For a long time, I've been thinking of "bumping" up the top of my wing tank because I'd like to get an extra hour of fuel, so I'm looking for around four, maybe five more gallons. It's really the only option I have since I'm using a Ford and can't get the carb low enough for a nose tank.I'm thinking that if it wouldn't be too noticible on the ground since it seems as if it only needs to come up a couple of inches.I just can't figure the math though, if I generally follow the top contour of the wing, and go almost to each side with the "bump" can anyone estimate how high the highest spot would need to go to get about five more gallons? My best guess is about 2.5 inches.Also, it seems like it would make fueling easier if the cap was to one side, but then I thought it might want to slosh out more in a bank than if it was centered. Any thoughts or experience on this too?Douwe________________________________________________________________________________
Hello,For a long time, I've been thinking of "bumping" up the top of my wing tank because I'd like to get an extra hour of fuel, so I'm looking for around four, maybe five more gallons. It's really the only option I have since I'm using a Ford and can't get the carb low enough for a nose tank.I'm thinking that if it wouldn't be too noticible on the ground since it seems as if it only needs to come up a couple of inches.I just can't figure the math though, if I generally follow the top contour of the wing, and go almost to each side with the "bump" can anyone estimate how high the highest spot would need to go to get about five more gallons? My best guess is about 2.5 inches.Also, it seems like it would make fueling easier if the cap was to one side, but then I thought it might want to slosh out more in a bank than if it was centered. Any thoughts or experience on this too?Douwe________________________________________________________________________________
RE: Pietenpol-List: "moth" wing tank
Original Posted By: owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-lis
Subject: RE: Pietenpol-List: "moth" wing tankA US gallon is 231 cubic inches. If you know the profile you want, and can find the area of the airfoil-like shape and find your volume. With tools like google sketchup you could have the exact tankage in a matter of minutes....!Steve E.
Subject: RE: Pietenpol-List: "moth" wing tankA US gallon is 231 cubic inches. If you know the profile you want, and can find the area of the airfoil-like shape and find your volume. With tools like google sketchup you could have the exact tankage in a matter of minutes....!Steve E.
Pietenpol-List: "moth" wing tank
Original Posted By: shad bell
Pietenpol-List: Re: "moth" wing tank
Original Posted By: "T White"
Not sure about a moth tank, but have been thinking about doing something else different.My leading edge of my center section is mostly polished aluminum now,and the top of the center section looks good in wood. Have no doubt the aluminumis fine without covering, but anyone flying a piet that doesn't have thecenter section covered with fabric? It has so many screws it seems like it wouldbe well attached, and I would like to be able to remove the tank without recoveringthe center section.Concerns are .. is the fairly thin plywood strong enough without the fabric covering,and what would have decent UV protection, as the varnish on it is probablynot enough to cut it.Any thoughts?My tank is only 5.5 gallons, the main tank is about 15, which is more than I willwant to use without taking a break anyway.JimRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Not sure about a moth tank, but have been thinking about doing something else different.My leading edge of my center section is mostly polished aluminum now,and the top of the center section looks good in wood. Have no doubt the aluminumis fine without covering, but anyone flying a piet that doesn't have thecenter section covered with fabric? It has so many screws it seems like it wouldbe well attached, and I would like to be able to remove the tank without recoveringthe center section.Concerns are .. is the fairly thin plywood strong enough without the fabric covering,and what would have decent UV protection, as the varnish on it is probablynot enough to cut it.Any thoughts?My tank is only 5.5 gallons, the main tank is about 15, which is more than I willwant to use without taking a break anyway.JimRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Re: Pietenpol-List: Take off roll
Original Posted By: "Phillips, Jack"
Jack, what motor are you using, and do you have any idea of your rate of climbflying solo?Now let me see if I have the formula right? My runway is 600 ft. 400 ft to getoff and another 200 ft to clear the 5 ft fence at the end. At the 600 ft mark,I should be at 6.8 ft agl, but does that 150 fpm acount for the downward thrustfrom the human pucker factor, or since the opening of the cockpit is ontop, does the vacume in the seat actually draw air in from above and create addedlift?Sent via BlackBerry from T-Mobile-----Original Message-----
Jack, what motor are you using, and do you have any idea of your rate of climbflying solo?Now let me see if I have the formula right? My runway is 600 ft. 400 ft to getoff and another 200 ft to clear the 5 ft fence at the end. At the 600 ft mark,I should be at 6.8 ft agl, but does that 150 fpm acount for the downward thrustfrom the human pucker factor, or since the opening of the cockpit is ontop, does the vacume in the seat actually draw air in from above and create addedlift?Sent via BlackBerry from T-Mobile-----Original Message-----
Re: Pietenpol-List: "moth" wing tank
Original Posted By: Douwe Blumberg
DouweOne fairly simple way of doing this problem is to calculate how many sq. ft your tank is, then multiply by .625, times the height of the tank in inches. There are .625 gal in 1 sq. ft, one inch deep.Dick N. ----- Original Message -----
DouweOne fairly simple way of doing this problem is to calculate how many sq. ft your tank is, then multiply by .625, times the height of the tank in inches. There are .625 gal in 1 sq. ft, one inch deep.Dick N. ----- Original Message -----