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CG- Measuring in. to cm.
For those of you who think they are great at converting centimeters. to inches. um... think twice.
Me, a 41 Year old, with a math degree, Systems Analyst, pretty bright went ahead and converted the 10 cm. CG to 2.54 inches. Well, ITS NOT 2.54" it's ~3.75 Inches...DOHH Added so much lead the plane could have been a sinker if I was fishing. Luckily I was watching some threads on this board and it got me thinking, why was one person also having issues. So, before long I broke out a ruler and behold! Thank the man upstairs I didn't attempt to have flown it since the weather has been freezing in the N.E. lately. Now I can go back and remove all that lead and start over. Moral of this story... don't think you are too smart, measure twice and double check against a resource. If it seems out of whack, it probably is. |
RE: CG- Measuring in. to cm.
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An online calculator on the Tower Hobbies web site shows 10 cm to be 3.937 inches
http://www.towerhobbies.com/help/convcalcs.html |
RE: CG- Measuring in. to cm.
ORIGINAL: RealPilotAce For those of you who think they are great at converting centimeters. to inches. um... think twice. Me, a 41 Year old, with a math degree, Systems Analyst, pretty bright went ahead and converted the 10 cm. CG to 2.54 inches. Well, ITS NOT 2.54" it's ~3.75 Inches...DOHH Added so much lead the plane could have been a sinker if I was fishing. Luckily I was watching some threads on this board and it got me thinking, why was one person also having issues. So, before long I broke out a ruler and behold! Thank the man upstairs I didn't attempt to have flown it since the weather has been freezing in the N.E. lately. Now I can go back and remove all that lead and start over. Moral of this story... don't think you are too smart, measure twice and double check against a resource. If it seems out of whack, it probably is. James |
RE: CG- Measuring in. to cm.
That was what the '~' was for about. But thanks for the exact measurement. I'm going to go a bit nose heavy, 1 cm. Which would work out to the 3.75 or so, Just to see how it will take to the air. Then make any changes afterwards.
I wish I could find my metal machinist ruler. |
RE: CG- Measuring in. to cm.
You got caught by the 2.54cms=1 inch :)
The best converter program I know of is the one from this site http://joshmadison.net/software/convert/ because it's free, it's not a big program and you can use it anytime. It tells me your CG should be 1.057023e-017 light years back from the LE :D |
RE: CG- Measuring in. to cm.
Well, the real conversion is the distance from the earth's equator to the pole is 10,000 km, or 6,215.05 miles. Working out the conversion you end up with a meter to be bit over 39.37 inches in length.
I hope you are not the systems engineer that managed to plant the Mars Climate Orbiter back in 1999. http://mars.jpl.nasa.gov/msp98/news/mco990930.html |
RE: CG- Measuring in. to cm.
ORIGINAL: downunder You got caught by the 2.54cms=1 inch :) The best converter program I know of is the one from this site http://joshmadison.net/software/convert/ because it's free, it's not a big program and you can use it anytime. It tells me your CG should be 1.057023e-017 light years back from the LE :D Cheers Pups |
RE: CG- Measuring in. to cm.
ORIGINAL: pupmeister ORIGINAL: downunder You got caught by the 2.54cms=1 inch :) The best converter program I know of is the one from this site http://joshmadison.net/software/convert/ because it's free, it's not a big program and you can use it anytime. It tells me your CG should be 1.057023e-017 light years back from the LE :D Cheers Pups Ken |
RE: CG- Measuring in. to cm.
I love Ken's solution! :) Heck, Google even does the light years conversion as well. :)
http://i57.photobucket.com/albums/g2...sc/convert.jpg |
RE: CG- Measuring in. to cm.
Wasn't a miscalculation between metric and imperial the cause of a probe to Mars running out of fuel and being lost. And those were Nasa Engineers, supposed to be the smartest in the country!!! [X(]
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RE: CG- Measuring in. to cm.
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A very easy way to do it that includes no calculations is to get a ruler with both cm and inches on it, and then line up the values with a straight edge or carpenters square. Using this method, I get 10 cm = 3 and 15/16" Which calculates to 3.9375. That is exactly the same as the google calculator. Sorry for the fuzzy pics, but you get the point.
LT-40 |
RE: CG- Measuring in. to cm.
LT-40--You the man! Hooray for the 20th century![8D]
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RE: CG- Measuring in. to cm.
Thats right! Big difference in mile vs kilometers in distance. JPL tried for a hole in one.
quote]Mars Climate Orbiter was lost on arrival September 23, 1999. Engineers concluded that the spacecraft entered the planet's atmosphere too low and probably burned up.[[/quote] |
RE: CG- Measuring in. to cm.
The absolute best way I've found to use the metric measurements you find in so many manuals is...............
my metric ruler and when that's not long enough, the yardstick that has metric along one edge with inches on the other |
RE: CG- Measuring in. to cm.
ORIGINAL: LT-40 A very easy way to do it that includes no calculations is to get a ruler with both cm and inches on it, and then line up the values with a straight edge or carpenters square. Using this method, I get 10 cm = 3 and 15/16" Which calculates to 3.9375. That is exactly the same as the google calculator. Sorry for the fuzzy pics, but you get the point. LT-40 Good idea, I used to use it alot in England. James |
RE: CG- Measuring in. to cm.
Almost every hardware or home improvement store around here sells rulers and yardsticks with metric along one side and inches along the other.
And most are even more useful in that they have the rules on both sides and originating from the same end. I use one to line up horizontal stabilizers because it's metric AND can simply be rolled in the hand (instead of turned end to end) when I compare the other side (wing to stab measurement). |
RE: CG- Measuring in. to cm.
And in fact, the last place I was in that had very good metal rulers and yardsticks with both metric and inches was an office supply. All the office supply places carry good quality, decently priced rulers.
BTW, they also have useful stuff like the circle template I bought a couple of days ago. I'm always looking around the shop for a jar top or roll of tape the right diameter to draw a circle. Now I've got that template with graduated holes in it. And it wasn't but a couple of bucks. Now where is that sucker???? |
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