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General control line discussion => Open Forum => Topic started by: Kafin Noe’man on November 04, 2024, 05:02:41 AM
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Guys,
I need some help to calculate the estimate starting point of the leadout for the P40 ARF.
I’ve read somewhere that we can do that by an app called LINEII or LINEIII, but that’s for Windows only.
I don’t have any Windows PC/Laptop. So, if you guys don’t mind helping me to calculate that, I would be very happy and I really appreciate it.
What numbers do you need to run the calculation?
My CG is at 2-3/4” behind the chord LE.
Looking forward to hearing more from you.
Best,
Kafin
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https://www.amazon.com/DOWELL-Bricklaying-Engineering-Surveying-Metalworking/dp/B0C7QGL39P/ref=sr_1_35?crid=2UARJQK0QFVPN&dib=eyJ2IjoiMSJ9.Uhkc66dISDvCtNT_8Zo8uctuDI2uj302UQc0TdlLkMbDCm3M9WKxLgCpKtp1wGzjAUp04slOiAl9bFNEUhHKtK8Iel43L4CT0n62QBWamWhV-grZEWhrdFceXdTgJFH5MFIjT6BH69k_VOBx8WuL8XDb6kj3ATppfmGUHSdXp6zvJpld1dME-gwUm-Usy2ihPrgxjkUNxN3Q2D23RNBMjYRh3EBlaKeMcm2HSf8_8wPi3BYSk97XCIVHZtB92dp9fM9B1suBA6fITjnE37c-ZYbXWwwRkomw3alB1FNxdL0.Sp7lDHZBVCTHYcQkHg0xbNviST_Ju2OiAJR0_lCW1h8&dib_tag=se&keywords=line%2Blevel&qid=1730724237&sprefix=line%2Blevel%2Caps%2C132&sr=8-35&th=1
Get one of these levels. Hang the plane by the leadouts, place the level on the nose, move the leadouts until the level reads 1/8 inch per foot nose down. Go fly. Set a normal reading level next to the new one on a flat surface to figure out where level is on the new one. It reads different from normal levels. The "zero or level" mark should point at the propeller. The line 3 is a giant waste of time.
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At this link you can do the calculations directly online, you don't need a specific OS.
http://nclra.org/Programs/LineRake.php
Massimo
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Hang the airplane by both leadoutss on one hook. Adjust the guide until the nose is 1 1/2-2 degrees nose down-go fly. Tweak as needed by test flying.
It doesn't need to be any more complex.
Dave
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Hang the airplane by both leadoutss on one hook. Adjust the guide until the nose is 1 1/2-2 degrees nose down-go fly. Tweak as needed by test flying.
It doesn't need to be any more complex.
Dave
What Dave said above.......
I have this same airplane (RoJett 50) and it flys great balanced right on the spar...at the rear edge of the wing leading edge sheeting.
Hang it by the leadouts and move the slider for about 1 1/2 degrees nose down.
When I flew it for the first few times balanced at the mfgrs C/G....it was wildly nose heavy and when flying it felt like I was leading a dog on a leash!