* * * Converting degrees to inches ! ! * * *
11-14-2004, 04:46 PM
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* * * Converting degrees to inches ! ! * * *
I am trying to figure out the control thows given in an older instruction manual that are listed in degrees only. I need to figure out what the equivalent to 10, 12, 14 and 23 degrees are in inches.
Thanks in advance for your help! John
Thanks in advance for your help! John
11-14-2004, 10:00 PM
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RE: * * * Converting degrees to inches ! ! * * *
Buy a Degree meter from SEARS, cut out the magnet and stick it
on the control surface with double stickum tape (rug tape)...
Read the degrees out direct, saves a lot of math.
Syd
on the control surface with double stickum tape (rug tape)...
Read the degrees out direct, saves a lot of math.
Syd
11-15-2004, 08:25 AM
#5
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RE: * * * Converting degrees to inches ! ! * * *
Since accuracy is relatively unimportant you can get the up/down distance graphically with a cheap protractor. Borrow a protractor from child in the family or neighborhood and sketch it out on a piece of notebook paper. Often a graphical solution will produce much more intuitive data than a math solution.
11-15-2004, 02:40 PM
#6
RE: * * * Converting degrees to inches ! ! * * *
John, you need a cheap scientific calculator that has the sine function on it. The button will have "sin" on it. I recommend the TI-30Xa for my math students. It is less than $10 at Target, Wal-Mart, K-mart, etc. You might even have one at home.
What am I thinking, you are on your computer, bringup the calculator and click view, then scientific.
The sine of an angle is the hypotenuse (the width of the control surface) divided by the movement. Suppose your elevator is 2 inches wide and you want to know the movement for 10 degrees. Sine 10 = x/2, or 2 sin 10 =x.
On the calculator, enter 10, press the sin button, then times 2 and =.
This gives .347 inches or just under 3/8 inch. Here's the key sequence again:
10
sin
* (times)
2
= (or Enter on your computer)
Hope this helps.
What am I thinking, you are on your computer, bringup the calculator and click view, then scientific.
The sine of an angle is the hypotenuse (the width of the control surface) divided by the movement. Suppose your elevator is 2 inches wide and you want to know the movement for 10 degrees. Sine 10 = x/2, or 2 sin 10 =x.
On the calculator, enter 10, press the sin button, then times 2 and =.
This gives .347 inches or just under 3/8 inch. Here's the key sequence again:
10
sin
* (times)
2
= (or Enter on your computer)
Hope this helps.
11-15-2004, 05:14 PM
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RE: * * * Converting degrees to inches ! ! * * *
Or Excel.....
angle 10 12 14 23
sin 0.173648178 0.207911691 0.241921896 0.390731128
chord
0.5 0.086824089 0.103955845 0.120960948 0.195365564
0.6 0.104188907 0.124747014 0.145153137 0.234438677
0.7 0.121553724 0.145538184 0.169345327 0.27351179
0.8 0.138918542 0.166329353 0.193537516 0.312584903
0.9 0.15628336 0.187120522 0.217729706 0.351658016
1 0.173648178 0.207911691 0.241921896 0.390731128
1.1 0.191012995 0.22870286 0.266114085 0.429804241
1.2 0.208377813 0.249494029 0.290306275 0.468877354
1.3 0.225742631 0.270285198 0.314498464 0.507950467
1.4 0.243107449 0.291076367 0.338690654 0.54702358
1.5 0.260472267 0.311867536 0.362882843 0.586096693
(sorry for the ugly formatting)
Mark
angle 10 12 14 23
sin 0.173648178 0.207911691 0.241921896 0.390731128
chord
0.5 0.086824089 0.103955845 0.120960948 0.195365564
0.6 0.104188907 0.124747014 0.145153137 0.234438677
0.7 0.121553724 0.145538184 0.169345327 0.27351179
0.8 0.138918542 0.166329353 0.193537516 0.312584903
0.9 0.15628336 0.187120522 0.217729706 0.351658016
1 0.173648178 0.207911691 0.241921896 0.390731128
1.1 0.191012995 0.22870286 0.266114085 0.429804241
1.2 0.208377813 0.249494029 0.290306275 0.468877354
1.3 0.225742631 0.270285198 0.314498464 0.507950467
1.4 0.243107449 0.291076367 0.338690654 0.54702358
1.5 0.260472267 0.311867536 0.362882843 0.586096693
(sorry for the ugly formatting)
Mark
11-16-2004, 10:06 PM
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RE: * * * Converting degrees to inches ! ! * * *
Boy, you guys make me want to back to school and take math all over again. I understand what you saying but.....damb!! [&:]
Isn't RCU great!!! Just ask and you shall receive. [8D]
Isn't RCU great!!! Just ask and you shall receive. [8D]
11-18-2004, 11:40 AM
#10
RE: * * * Converting degrees to inches ! ! * * *
Isn't it easier to just hook them up so they get the throw that looks right and fly it? set the dual rates at a little less just in case you want less throw and fly? Man, all that figuring makes it like work.
11-18-2004, 06:27 PM
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RE: * * * Converting degrees to inches ! ! * * *
Isn't it easier to just hook them up so they get the throw that looks right and fly it? set the dual rates at a little less just in case you want less throw and fly?
Ed S
11-22-2004, 04:03 PM
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RE: * * * Converting degrees to inches ! ! * * *
ORIGINAL: bentgear
Whats the easy way to reverse it and convert instructions in inches to degrees?
Ed M.
Whats the easy way to reverse it and convert instructions in inches to degrees?
Ed M.
Referring to the picture.... deflection/chord=sine angle
11-22-2004, 04:34 PM
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RE: * * * Converting degrees to inches ! ! * * *
Tall Paul
.
Referring to the picture.... deflection/chord=sine angle
.
Referring to the picture.... deflection/chord=sine angle
angle = arcsin (deflection/chord)
Arcsin is usually Inv-Sin on a calculator. Just make sure you've got it set for degrees (the default is often radians, 360 degrees = 2 * Pi Radians)
I've been waiting 26 years to use some trig.
Mark
11-22-2004, 05:40 PM
#16
RE: * * * Converting degrees to inches ! ! * * *
From another similar thread: "Let's use your rudder @ 20 degrees as an example. Measure it at the widest point. Say this dimension is 3". Multiply by two to give you the diameter if the rudder could move in a full circle. (6"} Multiply this times pi (3.14). Divide the answer ( 18.84) by 360 and you have the length of 1 degree. ( .052"} This times 20 is 1.04" throw for the rudder. You will be measuring a chord and not an arc, but it's plenty close enough."
11-23-2004, 11:16 PM
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RE: * * * Converting degrees to inches ! ! * * *
You math guys have WAY too much time on your hands. I Just get the throws close and then let the plane tell me what it wants from there. 
11-23-2004, 11:24 PM
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RE: * * * Converting degrees to inches ! ! * * *
ORIGINAL: mahmc1
You math guys have WAY too much time on your hands. I Just get the throws close and then let the plane tell me what it wants from there.
You math guys have WAY too much time on your hands. I Just get the throws close and then let the plane tell me what it wants from there.
After you do it enough, I bet everyone does it this way..
We know what combinations of servo arms and surface horns will do the job.
But having a grounding in what works at all is kinda nice to have.
11-23-2004, 11:46 PM
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RE: * * * Converting degrees to inches ! ! * * *
Thanks guys, got both formulas in a spread sheet now and then plugged it into my Palm. Beats drawing it up in CAD or putting it into Linkage Design when all you need is a quick answer.
Ed M.
Ed M.
11-24-2004, 07:18 AM
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RE: * * * Converting degrees to inches ! ! * * *
The reason I have requested the control throws is because I am presently installing the two elevator servos. I want the pushrod to be parallel to the bottom of the stabilizer. Depending on how much throw I set it up with depends on how much I screw the control horn up or down the threaded control arm, which in turn dicatates where I glue the servo in place in the lightening hole in the rear of the fuse. (higher or lower to keep the push rod parallel to the stabilizer bottom). Goldberg e-mailed me and said to use 3/4" on the elevator. They did not specify if that was the low rate or the high rate. I e-mailed them back and have not gotten a response for over a week now. A couple guys posted anywhere from about 1 and 1/4" to 2 and 1/2" of throw! That's quite a difference!
Someone also posted that if you set up the elevators with the 3/4" Goldberg recommends, if you get slow, you won't even have enough throw to bring the nose up and will hence make a hard landing. Someone has to post good starting throws eventually! Love the Ultimate 10-300 bipe!
Thanks, John
Someone also posted that if you set up the elevators with the 3/4" Goldberg recommends, if you get slow, you won't even have enough throw to bring the nose up and will hence make a hard landing. Someone has to post good starting throws eventually! Love the Ultimate 10-300 bipe!
Thanks, John
11-24-2004, 08:40 AM
#21
RE: * * * Converting degrees to inches ! ! * * *
This is the first mention I see of the Goldberg Ultimate in this thread I'll bet there are dozens of us out here who still have the original plans and could have looked it up.
The 3/4 inch throw is, I'm sure ±0.75", and is quite adequate for flying. That business about getting too slow and not having enough elevator...
Don't get this thing too slow on landing. It will float in, but you don't want to get in the position of needing a big change in pitch at low speed. If you do, it is precisely the wrong thing to apply 2" of elevator - it will snap.
The plane flies great, lands nicely and performs well at slow speed. You don't need more than the quoted 3/4" elevator unless you're hanging on the prop.
Best wishes,
Dave Olson
The 3/4 inch throw is, I'm sure ±0.75", and is quite adequate for flying. That business about getting too slow and not having enough elevator...
Don't get this thing too slow on landing. It will float in, but you don't want to get in the position of needing a big change in pitch at low speed. If you do, it is precisely the wrong thing to apply 2" of elevator - it will snap.
The plane flies great, lands nicely and performs well at slow speed. You don't need more than the quoted 3/4" elevator unless you're hanging on the prop.
Best wishes,
Dave Olson
ORIGINAL: Snaproll John
The reason I have requested the control throws is because I am presently installing the two elevator servos. I want the pushrod to be parallel to the bottom of the stabilizer. Depending on how much throw I set it up with depends on how much I screw the control horn up or down the threaded control arm, which in turn dicatates where I glue the servo in place in the lightening hole in the rear of the fuse. (higher or lower to keep the push rod parallel to the stabilizer bottom). Goldberg e-mailed me and said to use 3/4" on the elevator. They did not specify if that was the low rate or the high rate. I e-mailed them back and have not gotten a response for over a week now. A couple guys posted anywhere from about 1 and 1/4" to 2 and 1/2" of throw! That's quite a difference!
Someone also posted that if you set up the elevators with the 3/4" Goldberg recommends, if you get slow, you won't even have enough throw to bring the nose up and will hence make a hard landing. Someone has to post good starting throws eventually! Love the Ultimate 10-300 bipe!
Thanks, John
The reason I have requested the control throws is because I am presently installing the two elevator servos. I want the pushrod to be parallel to the bottom of the stabilizer. Depending on how much throw I set it up with depends on how much I screw the control horn up or down the threaded control arm, which in turn dicatates where I glue the servo in place in the lightening hole in the rear of the fuse. (higher or lower to keep the push rod parallel to the stabilizer bottom). Goldberg e-mailed me and said to use 3/4" on the elevator. They did not specify if that was the low rate or the high rate. I e-mailed them back and have not gotten a response for over a week now. A couple guys posted anywhere from about 1 and 1/4" to 2 and 1/2" of throw! That's quite a difference!
Someone also posted that if you set up the elevators with the 3/4" Goldberg recommends, if you get slow, you won't even have enough throw to bring the nose up and will hence make a hard landing. Someone has to post good starting throws eventually! Love the Ultimate 10-300 bipe!
Thanks, John
11-24-2004, 10:13 AM
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RE: * * * Converting degrees to inches ! ! * * *
Let's see if this is readable...
Nope.. Can't seem to load right.
E-mail me and I'll send you a conversion chart both in inches and mm's in a PDF file. I wish I could have posted it.
John
Nope.. Can't seem to load right.
E-mail me and I'll send you a conversion chart both in inches and mm's in a PDF file. I wish I could have posted it.
John
