Degrees into inches
09-21-2011, 07:41 PM
#1
Degrees into inches
I have a Carl Goldberg Ultimate Bipe and the control throws are all listed in degrees and for the life of me I cannot figure how to convert degress into inches. The elevtor is 10 to 12 degrees. What does that work out to in inches? Thanks for yoru help, Dave
09-21-2011, 08:03 PM
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RE: Degrees into inches
Dave, they make a lot of good devices for setting up control surface throw, why the need to know the length of the throw? You can get a compass at Wally World and use this. Doing it with a travel distance would b the hard way!
09-21-2011, 08:43 PM
#3
RE: Degrees into inches
You would need to use the length of each surface to calculate the throw in degree. I would go buy a protractor myself for a dollar at the stationery store.
09-22-2011, 04:15 AM
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RE: Degrees into inches
Dave,
Measure the length of the control surface - perpendicular to the hingeline (front to back), multiply this by the sin of the angle and that will give you the deflection in inches at the control surface edge. For tapered control surfaces this will vary as you move inboard to outboard....
sin 10 = .1736
sin 12 = .2079
For a 1 inch length at 10 deg, the deflection will be .1736" or about 11/64"
Hope this helps.
Steve
Measure the length of the control surface - perpendicular to the hingeline (front to back), multiply this by the sin of the angle and that will give you the deflection in inches at the control surface edge. For tapered control surfaces this will vary as you move inboard to outboard....
sin 10 = .1736
sin 12 = .2079
For a 1 inch length at 10 deg, the deflection will be .1736" or about 11/64"
Hope this helps.
Steve
09-22-2011, 05:15 AM
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RE: Degrees into inches
ORIGINAL: ARUP
Sin theta = opposite/adjacent. That's all you need to know to figure any angle, any time, anywhere.
Sin theta = opposite/adjacent. That's all you need to know to figure any angle, any time, anywhere.
tan theta = opposite/adjacent
For small angles they will be close to each other but we might as well get it right.
Maybe we need one of Minnflyer's graphical simulations.....
09-22-2011, 06:37 AM
#10
RE: Degrees into inches
Well, sorry, no matter what I do the pic will not stay rotated when I save it. If you have adobe you should be able to rotate it when you open it. I used 1 1/2" for the elevator dimension, just substitute what ever your dimension isand you should get close enough, just remember that if you measure from the top surface of your stab , measure to the top surface of the elevator trailing edge and not the bottom or your angle will not be correct.
09-22-2011, 07:11 AM
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RE: Degrees into inches
Hi!
Why bother with meassuring trows....I don't!
Just go with what you are used to do before! This isn't rocket science you know...!
Most planes need just one or two centimeter trow meassured at the back of each flying surface, except rudder where you use as much trow as you can.
After the first flight ask yourself if you are sattiesfied with the planes behavoir and trim it if needed. It's very important that the C of g is changed so that trows can be minimized as much as possible,that means moving servos, batteries and other things as far rearward as possible.
Don´t complicate thing that don´t need to be complicated!
Why bother with meassuring trows....I don't!
Just go with what you are used to do before! This isn't rocket science you know...!
Most planes need just one or two centimeter trow meassured at the back of each flying surface, except rudder where you use as much trow as you can.
After the first flight ask yourself if you are sattiesfied with the planes behavoir and trim it if needed. It's very important that the C of g is changed so that trows can be minimized as much as possible,that means moving servos, batteries and other things as far rearward as possible.
Don´t complicate thing that don´t need to be complicated!
09-22-2011, 12:24 PM
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RE: Degrees into inches
ORIGINAL: jaka
Hi!
Why bother with meassuring trows....I don't!
Just go with what you are used to do before! This isn't rocket science you know...!
Most planes need just one or two centimeter trow meassured at the back of each flying surface, except rudder where you use as much trow as you can.
After the first flight ask yourself if you are sattiesfied with the planes behavoir and trim it if needed. It's very important that the C of g is changed so that trows can be minimized as much as possible,that means moving servos, batteries and other things as far rearward as possible.
Don´t complicate thing that don´t need to be complicated!
Hi!
Why bother with meassuring trows....I don't!
Just go with what you are used to do before! This isn't rocket science you know...!
Most planes need just one or two centimeter trow meassured at the back of each flying surface, except rudder where you use as much trow as you can.
After the first flight ask yourself if you are sattiesfied with the planes behavoir and trim it if needed. It's very important that the C of g is changed so that trows can be minimized as much as possible,that means moving servos, batteries and other things as far rearward as possible.
Don´t complicate thing that don´t need to be complicated!
09-22-2011, 01:41 PM
#15
RE: Degrees into inches
ORIGINAL: raydar
You would need to use the length of each surface to calculate the throw in degree. I would go buy a protractor myself for a dollar at the stationery store.
You would need to use the length of each surface to calculate the throw in degree. I would go buy a protractor myself for a dollar at the stationery store.
And at the ripe old age of 70 and not an engineering type, I've forgotten all of that High School math.
Sure would be nice if someone would post a simple formula (substituting the numeric value for Pie, sin, etc.) or a spreadsheet formula that we could all use for various purposes. I for one would really appreciate something like that.
Thanks in advance to anyone who can do that,
=Rick=
09-22-2011, 01:57 PM
#16
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RE: Degrees into inches
ORIGINAL: cstevenpeterson
Not trying to be picky, but - Slight correction: sin theta = opposite/hypotenuse
tan theta = opposite/adjacent
For small angles they will be close to each other but we might as well get it right.
Maybe we need one of Minnflyer's graphical simulations.....
ORIGINAL: ARUP
Sin theta = opposite/adjacent. That's all you need to know to figure any angle, any time, anywhere.
Sin theta = opposite/adjacent. That's all you need to know to figure any angle, any time, anywhere.
tan theta = opposite/adjacent
For small angles they will be close to each other but we might as well get it right.
Maybe we need one of Minnflyer's graphical simulations.....
09-22-2011, 04:18 PM
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RE: Degrees into inches
ORIGINAL: hugger-4641
let's try again with the pic rotated!
let's try again with the pic rotated!
hook
09-22-2011, 05:36 PM
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RE: Degrees into inches
ORIGINAL: MinnFlyer
Bad policy. You should use the Tx to make small adjustments only. Larger adjustments should be made mechanically
ORIGINAL: stevenmax50
Then Iuse my rates to bring it down, if needed.
Then Iuse my rates to bring it down, if needed.
09-22-2011, 08:15 PM
#19
RE: Degrees into inches
ORIGINAL: golf4two
...........Sure would be nice if someone would post a simple formula (substituting the numeric value for Pie, sin, etc.) or a spreadsheet formula that we could all use for various purposes. I for one would really appreciate something like that.
Thanks in advance to anyone who can do that,
=Rick=
...........Sure would be nice if someone would post a simple formula (substituting the numeric value for Pie, sin, etc.) or a spreadsheet formula that we could all use for various purposes. I for one would really appreciate something like that.
Thanks in advance to anyone who can do that,
=Rick=
09-23-2011, 04:40 AM
#20
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RE: Degrees into inches
ORIGINAL: golf4two
It's pretty difficult to measure a two degree dihedral on a 60 inch wing with such a small device. Or even a one or two degree engine offset.....
And at the ripe old age of 70 and not an engineering type, I've forgotten all of that High School math.
Sure would be nice if someone would post a simple formula (substituting the numeric value for Pie, sin, etc.) or a spreadsheet formula that we could all use for various purposes. I for one would really appreciate something like that.
Thanks in advance to anyone who can do that,
=Rick=
ORIGINAL: raydar
You would need to use the length of each surface to calculate the throw in degree. I would go buy a protractor myself for a dollar at the stationery store.
You would need to use the length of each surface to calculate the throw in degree. I would go buy a protractor myself for a dollar at the stationery store.
And at the ripe old age of 70 and not an engineering type, I've forgotten all of that High School math.
Sure would be nice if someone would post a simple formula (substituting the numeric value for Pie, sin, etc.) or a spreadsheet formula that we could all use for various purposes. I for one would really appreciate something like that.
Thanks in advance to anyone who can do that,
=Rick=
09-23-2011, 02:21 PM
#23
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RE: Degrees into inches
Gentlemen, One degree equals .018 [.01745 sine of 1degree] drop or increase per inch. Example:aileron2"wide moving up or down 10* would travel 11/32"
Dihederal of 3*on a 60" wing would equal- .0174X60=1.047" or .523" per side. On the models we build just multiply the lengthx.020x# of degrees desired. Close enough.
fredsedno
Dihederal of 3*on a 60" wing would equal- .0174X60=1.047" or .523" per side. On the models we build just multiply the lengthx.020x# of degrees desired. Close enough.
fredsedno