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Problems with flight lift

Posted: February 8th, 2019, 6:40 am
by sciolywin
After decreasing the weight of my plane, changing the angle of attack, and adding clay to change the center of gravity, I have not been able to adjust my plane so that it has enough lift to go up as opposed to going down. I am not sure of what else to do. Any ideas?
Also, I have noticed that during flight, my plane is very unstable, but I am not sure of how to fix this. Thank you all!

Re: Problems with flight lift

Posted: February 8th, 2019, 11:12 am
by CrayolaCrayon
Can you give more info? What torque are you launching at? If you give really specific details, BJT can give you very specific and helpful feedback.

Re: Problems with flight lift

Posted: February 9th, 2019, 2:03 pm
by klastyioer
sciolywin wrote:After decreasing the weight of my plane, changing the angle of attack, and adding clay to change the center of gravity, I have not been able to adjust my plane so that it has enough lift to go up as opposed to going down. I am not sure of what else to do. Any ideas?
Also, I have noticed that during flight, my plane is very unstable, but I am not sure of how to fix this. Thank you all!
wdym by unstable
can you provide rubber thickness, length, mass, any wing posts info, and prop info

Re: Problems with flight lift

Posted: February 9th, 2019, 8:15 pm
by CrayolaCrayon
klastyioer wrote:
sciolywin wrote:After decreasing the weight of my plane, changing the angle of attack, and adding clay to change the center of gravity, I have not been able to adjust my plane so that it has enough lift to go up as opposed to going down. I am not sure of what else to do. Any ideas?
Also, I have noticed that during flight, my plane is very unstable, but I am not sure of how to fix this. Thank you all!
wdym by unstable
can you provide rubber thickness, length, mass, any wing posts info, and prop info
He told me .81, which seems rather thin. I'm thinking they try a .094 just to see how it goes.

Re: Problems with flight lift

Posted: February 10th, 2019, 4:26 pm
by sciolywin
I did about a .108 thickness motor with 80ish winds using a 15:1 winder and improved my flight time to about 1 minute, but I think lift is still a problem. I have my front wing at its maximum angle of incidence too. Any ideas? My goal is to get it to around 2-3 minutes by the end of this week. Thank you everyone!

Re: Problems with flight lift

Posted: February 10th, 2019, 4:40 pm
by klastyioer
sciolywin wrote:I did about a .108 thickness motor with 80ish winds using a 15:1 winder and improved my flight time to about 1 minute, but I think lift is still a problem. I have my front wing at its maximum angle of incidence too. Any ideas? My goal is to get it to around 2-3 minutes by the end of this week. Thank you everyone!
what about your stabilizer posts, that might be the problem.

Re: Problems with flight lift

Posted: February 10th, 2019, 4:45 pm
by sciolywin
The front wing has its maximum angle of incidence, and the horizontal stabilizer is flat. The distance between the horizontal stabilizer and wing are close to a maximum as well. The tilt on the front wing is around 5* to the left, the direction in which I wanted the plane to spin.

Re: Problems with flight lift

Posted: February 10th, 2019, 4:49 pm
by klastyioer
sciolywin wrote:The front wing has its maximum angle of incidence, and the horizontal stabilizer is flat. The distance between the horizontal stabilizer and wing are close to a maximum as well. The tilt on the front wing is around 5* to the left, the direction in which I wanted the plane to spin.
wait wait
wdym by tilt on the front wing

Re: Problems with flight lift

Posted: February 10th, 2019, 4:55 pm
by sciolywin
I tilted the front wing in the direction that I wanted it to spin. So it is spining towards the left and my left is angled down while the right is up.

Re: Problems with flight lift

Posted: February 10th, 2019, 4:56 pm
by CrayolaCrayon
sciolywin wrote:The front wing has its maximum angle of incidence, and the horizontal stabilizer is flat. The distance between the horizontal stabilizer and wing are close to a maximum as well. The tilt on the front wing is around 5* to the left, the direction in which I wanted the plane to spin.
I think you should level the wings, and add Wash-in. There are instructions to do that in the FF 2019 booklet.