Wing Angle
#1
Thread Starter
Senior Member
Joined: Dec 2002
Posts: 123
Likes: 0
Received 0 Likes
on
0 Posts
From: sdfdsf, ITALY
I glued my funfly wing in angle to the body (not fully perpendicular (like shown in the attachment)
further more it's seems that the angle is not consistent all along the wing but is steeper as getting close to the TE
i tried to find out in the funfly forum what will happened to the plane behavior will it roll ? ,will one of the wing halves stall ?, etc
so i'm ready to my maiden flight but i would like to know if i should run some corrections before or can i go on
thanks
further more it's seems that the angle is not consistent all along the wing but is steeper as getting close to the TE
i tried to find out in the funfly forum what will happened to the plane behavior will it roll ? ,will one of the wing halves stall ?, etc
so i'm ready to my maiden flight but i would like to know if i should run some corrections before or can i go on
thanks
#2
Senior Member
Joined: Oct 2002
Posts: 1,406
Likes: 0
Received 0 Likes
on
0 Posts
From: St. Charles, MO
How big is the angle in degrees or what is the deviation in inches at the tip and the span?
In general I think the leading wing for large angles will cause a roll in the up direction at flight conditions that allow it to retain flow compared to the trailing wing.
Having said that a degree or so won't be noticable. It also depends on what the intended purpose of the airplane is. Is it a nice high wing trainer or is it a pattern ship that needs to track perfectly (or as near as we can make them)?
It also depends on how easy it is to fix the problem compared to the size of the offset and how ambitious you are.
Anyway a little more data will help with the answer.
In general I think the leading wing for large angles will cause a roll in the up direction at flight conditions that allow it to retain flow compared to the trailing wing.
Having said that a degree or so won't be noticable. It also depends on what the intended purpose of the airplane is. Is it a nice high wing trainer or is it a pattern ship that needs to track perfectly (or as near as we can make them)?
It also depends on how easy it is to fix the problem compared to the size of the offset and how ambitious you are.
Anyway a little more data will help with the answer.
#3
Thread Starter
Senior Member
Joined: Dec 2002
Posts: 123
Likes: 0
Received 0 Likes
on
0 Posts
From: sdfdsf, ITALY
Dear Ben
It's seem that the gap between the 2 halves at LE is 1 cm
but at TE it can reach up to 2-2.5 cm
the model is a funfly and the wing was glued with epoxy to the body. i'm not sure how easy or hard it will be to disconnect the wing.
It's seem that the gap between the 2 halves at LE is 1 cm
but at TE it can reach up to 2-2.5 cm
the model is a funfly and the wing was glued with epoxy to the body. i'm not sure how easy or hard it will be to disconnect the wing.
#4
Senior Member
Joined: Oct 2002
Posts: 1,406
Likes: 0
Received 0 Likes
on
0 Posts
From: St. Charles, MO
I am not too sure exactly what your dimensions are referring to but 2.5 cm is an inch which is a lot I think. I have attached a crude drawing. Can you get the dimensions of A and B?
#5
Thread Starter
Senior Member
Joined: Dec 2002
Posts: 123
Likes: 0
Received 0 Likes
on
0 Posts
From: sdfdsf, ITALY
sorry ben but this is not the problem the wing and the elevator are paralleled.
the problem is that the wing is not perpendicular to the body .
due to bad gluing the wing is leaning toward the left side
I made two types of measurements
1) a) the height between the floor and the leftmost point LE
b) the height between the floor and the rightmost point LE
the gap showed something like 1 cm . next i made the same
measurement on the TE and gap here was something like 2 cm
2) i tried to use a ruler to find out the degrees deviation between the body and the wing but could not reach an exact number it seems to be something like 5 or more degrees
is this explanation makes things clearer
thanks
the problem is that the wing is not perpendicular to the body .
due to bad gluing the wing is leaning toward the left side
I made two types of measurements
1) a) the height between the floor and the leftmost point LE
b) the height between the floor and the rightmost point LE
the gap showed something like 1 cm . next i made the same
measurement on the TE and gap here was something like 2 cm
2) i tried to use a ruler to find out the degrees deviation between the body and the wing but could not reach an exact number it seems to be something like 5 or more degrees
is this explanation makes things clearer
thanks
#6
Senior Member
Joined: Oct 2002
Posts: 1,406
Likes: 0
Received 0 Likes
on
0 Posts
From: St. Charles, MO
OK got it, In other words it looks like most of my airplanes!
If the wing and tail are horizonta/parallel to each other and if the vertical is 90 deg relative to the horizontal I would ignore it. The fuselage is just a stick holding the wing and tail in position and the slight cant, while noticable visually, probably won't be noticed in just flying around.
I am sure if we had a perfect version of it that the difference in flying would be noticable but I would guess a few clicks of trim would take care of any input the fuselage has.
If it were a pattern airplane I would suggest making everything true but not for a fun fly. It will fly just not be perfect.
If the wing and tail are horizonta/parallel to each other and if the vertical is 90 deg relative to the horizontal I would ignore it. The fuselage is just a stick holding the wing and tail in position and the slight cant, while noticable visually, probably won't be noticed in just flying around.
I am sure if we had a perfect version of it that the difference in flying would be noticable but I would guess a few clicks of trim would take care of any input the fuselage has.
If it were a pattern airplane I would suggest making everything true but not for a fun fly. It will fly just not be perfect.



