SeaEagle
Member
ok from my post in fabrics and alternative covering methods i have another question for you guys that a few have brought to my attention.
its regarding wing area and stall speed. here are the basic stats and objectives i want to meet with my design:
Y-DA-40a EZLite
parasol design
length: 18ft
wing span: 32ft
cord: 60"
airfoil: Clark Y
landing gear: spring steel or aluminum if i can work it.
engine: Compact Radial Engines, MZ34, depending on where you look, 27.5-30HP at 45lbs with electic start and pull cord.
prop: 54-60" wood fixed prop.
design targets: 1) ease of construction so that a person with little or no building experience can safely and confidently build my design. 2) want to be able to lift a pilot of 300lbs, assuming the aircraft comes in at an empty weight of 254lbs, a fuel load of 30lbs, i want an operational load of 584lbs. would like my UL to be a viable alternative to a pilot that has lost his medical but still wants to fly. 3) competitively priced kits in the range of $6,000 to $8,0000.
it has been brought to my attention that the wing area of 160sq ft may not be enough to achieve 24mph stall speed. i don't have a problem lengthing the wings more. but i figured at 32ft span was pretty long! truth be told i would be more comfortable with about an extra 4ft on each wing. and at a 60" cord not sure i can go much longer then that. what gives more lift in this case, a longer span or a longer cord? i am figuring its a combination of the two.
also i am assuming that Part 103 stall speed and max speed are derived from the average wight of a pilot of 170lbs. i can assume that a pilot weighing 300lbs is going to have a much higher stall speed then a much lighter pilot. but what do the "reg" say in this regard? MUST the plan fly within the speed limits regardless of the pilot flying the plane? so say if a 130lbs pilot can fly the craft at a stall speed of say 23mph but a 300lbs pilot has a stall at 33mph. is the aircraft still considered an UL? my logic says yes as the only variable that changes is the pilot.
its regarding wing area and stall speed. here are the basic stats and objectives i want to meet with my design:
Y-DA-40a EZLite
parasol design
length: 18ft
wing span: 32ft
cord: 60"
airfoil: Clark Y
landing gear: spring steel or aluminum if i can work it.
engine: Compact Radial Engines, MZ34, depending on where you look, 27.5-30HP at 45lbs with electic start and pull cord.
prop: 54-60" wood fixed prop.
design targets: 1) ease of construction so that a person with little or no building experience can safely and confidently build my design. 2) want to be able to lift a pilot of 300lbs, assuming the aircraft comes in at an empty weight of 254lbs, a fuel load of 30lbs, i want an operational load of 584lbs. would like my UL to be a viable alternative to a pilot that has lost his medical but still wants to fly. 3) competitively priced kits in the range of $6,000 to $8,0000.
it has been brought to my attention that the wing area of 160sq ft may not be enough to achieve 24mph stall speed. i don't have a problem lengthing the wings more. but i figured at 32ft span was pretty long! truth be told i would be more comfortable with about an extra 4ft on each wing. and at a 60" cord not sure i can go much longer then that. what gives more lift in this case, a longer span or a longer cord? i am figuring its a combination of the two.
also i am assuming that Part 103 stall speed and max speed are derived from the average wight of a pilot of 170lbs. i can assume that a pilot weighing 300lbs is going to have a much higher stall speed then a much lighter pilot. but what do the "reg" say in this regard? MUST the plan fly within the speed limits regardless of the pilot flying the plane? so say if a 130lbs pilot can fly the craft at a stall speed of say 23mph but a 300lbs pilot has a stall at 33mph. is the aircraft still considered an UL? my logic says yes as the only variable that changes is the pilot.
