Rudder pitch coupling
02-22-2004, 04:18 PM
#1
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Rudder pitch coupling
Chip and others,
This is my first own design aerobatic model. It fly's basic stuff well but has a violent pitch up when rudder is applied. After having noticed it and searching this forum I found that it is called rudder pitch coupling and it is caused by a uneven pressure distribution at the upper and lower side of the stab.
Looking at some proven designs (Synergy, and your designs etc.) I can see that the stab is not as low placed as mine but in your designs the stab is mostly placed in the lower half of the fuselage, contrary to some other designs where the stab is place more or less above the middle-line of the fuselage.
I would like to know from you in which way you determine the correct position of the stab. Is it calculated for each design or just by trial and error?
Is the optimal position for the stab in a given low-wing configuration the same as in a shoulder-wing configuration or is the position in a shoulder wing ideally higher to be more in line with the wing?
For this model where would be the optimal position?
Thanks for your input,
Hans
Hans Meij / Modelvliegen
03-02-2004, 02:15 AM
#2
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RE: Rudder pitch coupling
I would move the stab up as far as you can in the fuse and it will definitely help your problem with the rudd to elev pitch coupling. You are correct when you descibe our stab locations and yes they are where they are in relation to the wing for a reason, and that is to not require any up elev when using the rudd.
Nice looking plane
Chip
Nice looking plane
Chip
ORIGINAL: Hans Meij
Chip and others,
This is my first own design aerobatic model. It fly's basic stuff well but has a violent pitch up when rudder is applied. After having noticed it and searching this forum I found that it is called rudder pitch coupling and it is caused by a uneven pressure distribution at the upper and lower side of the stab.
Looking at some proven designs (Synergy, and your designs etc.) I can see that the stab is not as low placed as mine but in your designs the stab is mostly placed in the lower half of the fuselage, contrary to some other designs where the stab is place more or less above the middle-line of the fuselage.
I would like to know from you in which way you determine the correct position of the stab. Is it calculated for each design or just by trial and error?
Is the optimal position for the stab in a given low-wing configuration the same as in a shoulder-wing configuration or is the position in a shoulder wing ideally higher to be more in line with the wing?
For this model where would be the optimal position?
Thanks for your input,
Hans
Hans Meij / Modelvliegen
Chip and others,
This is my first own design aerobatic model. It fly's basic stuff well but has a violent pitch up when rudder is applied. After having noticed it and searching this forum I found that it is called rudder pitch coupling and it is caused by a uneven pressure distribution at the upper and lower side of the stab.
Looking at some proven designs (Synergy, and your designs etc.) I can see that the stab is not as low placed as mine but in your designs the stab is mostly placed in the lower half of the fuselage, contrary to some other designs where the stab is place more or less above the middle-line of the fuselage.
I would like to know from you in which way you determine the correct position of the stab. Is it calculated for each design or just by trial and error?
Is the optimal position for the stab in a given low-wing configuration the same as in a shoulder-wing configuration or is the position in a shoulder wing ideally higher to be more in line with the wing?
For this model where would be the optimal position?
Thanks for your input,
Hans
Hans Meij / Modelvliegen
03-02-2004, 01:13 PM
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RE: Rudder pitch coupling
Thanks for the advise, I will do some chopping and breaking to get the stab up.
Btw I did read that Breackman in Germany will distribute the DV (and perhaps the rest of the line)
That is good news for us in The Netherlands, for most of the Dutch it will only be a 2hr drive to Aken where Braeckman is situated.
I will fore sure be in the market for the DV or the Vison 3D.
Groeten,
Hans
Hans Meij / Modelvliegen
Btw I did read that Breackman in Germany will distribute the DV (and perhaps the rest of the line)
That is good news for us in The Netherlands, for most of the Dutch it will only be a 2hr drive to Aken where Braeckman is situated.
I will fore sure be in the market for the DV or the Vison 3D.
Groeten,
Hans
Hans Meij / Modelvliegen
