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iGoApp

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  1. Metar in Java

    in Plugin Development

    Posted

    Hi, Andyrooc. When I try to create an object referring to a class, it gives an error "The type temperature is not visible."

    This is what I am trying to do:

     

    import com.feldt.metar.*;

     

    public class main {

     

    public static void main(String[] args) {

     

    Temperature temp = new Temperature();

     

    String dep = temp.parseTemperature("KSEA");

     

    }

     

    }

     

    Hm, what is wrong? Thanks.

  3. Metar in Java

    in Plugin Development

    Posted

    Hi, all. If anyone is experienced in Java, can you help please? I am finishing a project (which is my first project, so I am just a beginner) and I would like to parse Metar data into my main class (actually, I need just temperature, but parsing the whole Metar report would be nice-to-have). I have found a code by Matthew Feldt, but cannot make it work (e.g., the Temperature method is not seen). Is there an easy and/or working solution?

     

    Thank you!

  6. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    The way I implemented this was to add all the VSpeed Correction tables for each weight class (lots of typing) and perform a series of lookup functions to grab the right values. The corrections are then added to the 8 degree and 20 degree V1 and VR values on the main calculations sheet.

    ...

    I don't see a calculation for wet vs. dry runway length in the POH. Where is that from?

    1) Yes, this is also how I did it.

    2) CRJ Pilot Handbook 1.0.1. Landing distance -- p.23; Wet landing field length -- p. 24. But this is not really important.

    3) It is hard to make perfect better, but in this case you may add the last thing -- Reduced Thrust Take-Off Setting, unless I miss it somewhere. :-)

    Great work! You should upload it to the org site, I think there is appetite for that. If I ever finish my java self-learning, I wanna try to do it in java as a pilot project. May be when I am retired and have a bit more time...

  7. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    If you can open my spreadsheet, you will see how I did it (you need to unhide the hidden spreadsheets). i also calculated the runway length based on the dry-wet condition. Getting these data (temperature and runway condition) from the metar may be tricky. If you get it as fixed width text, you could perhaps do the text to columns function and then use the appropriate column for the value determination. Do I make sense?

  8. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    I'm not sure where you are referring to a Speed Correction. Can you tell me the sheet name and Cell address?

    For example, Vspeed correction at 2000 ft and 30 C is +2 (18000 kg). If V1 = 122, the corrected speed should be 124. Is this right? So, I was just asking whether your calculated speeds take that into account. Cheers.

  9. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    Jagipson, you beat me on that one! :-)

    Do you use speed correction based on temp and altitude? Also, do you estimate the runway length based on wet vs dry conditions? Also, in Main Calculations worksheet, I entered Fuel on board of 8000, and it shows me %MAC and Stab Trim for LW (actual) as #N/A. There may be some error in the formula. Otherwise, great work!

  11. Balance point and calculated index

    in Canadair CRJ-200

    Posted

    Thanks a lot, jagipson! This is exactly why I was looking for the arm values! I know the gender does not make difference for the pilots. I just use it for fun to load the plane and then calculate the total weights by zone. By the way, I went to PlaneMaker and still did not find the arm values there. Can you help locate it please?

    I will try to save it in Google docs when it is finished. I am like 60 per cent through it. Need to figure out the best way to make speed corrections based on T and altitude. I think I have the idea though...

    I will send it for a peer review. Cheers.

  12. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    OK. Something like that...

    http://www.igorland....p_igorland.xlsx

    jagipson, I used some of your formulas. I hope you won't mind -- they are just too good to be ignored. ;)

    I just got to the point of calculating the indexes. I modified the original jagipson's table:

    1) Inserted an option to select seats using a plane chart;

    2) Modified the formula to calculate the Passengers' Index. As I mentioned before, the relationship is not perfectly linear, so in my table the index is calculated using a ratio (index point per lb) based on the values in the CRJ-200 manual;

    3) The Fuel index is more complex. I inserted three median points between every two values, and then used an interpolation formula. The calculated index is more or less exact now.

    Please let me know if you notice a bug.

    Cheers,

  13. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    The spreadsheet calculates things the same way that the manual does, except that it allows for differentiating between male and female PAX and allows for setting the standard weight for them. Actually what the spreadsheet does is recalculate these into "standard people" the typical PAX used in the manual. The index values only have meaning when done this way (within the context in the manual).

    Thanks, jagipson. So if I understand it correctly, for example, Index for 3 passengers in Zone A is 4.9 only for an average passenger weighting 176 lb (in other words, index 4.9 is for total weight 528 lb). So, if I want to get the index for one man, one woman, and one child sitting in zone A (based on the revised standards), the index will be:

    (200+179+79 [forgot what the exact weight for a child acccording to FAA is])*0.009[index point per 1 lb based on the manual] = 4.1.

    Is this correct?

    Thank you if you find time to clarify. Best.

  14. Balance point and calculated index

    in Canadair CRJ-200

    Posted · Edited by igorland

    Great table, jagipson! Very helpful when planning the flights. Especially when flying on VATSIM and every minute counts otherwise your arrival ATC will be closed by the time you get there. ;)

    I wanted to modify the table a little bit to be able to actually select the seats and choose who sits there (man, woman or child), so that the Passenger Index would be calculated based on that. I can use the pax index formula that you use, however it is not perfectly linear and sometimes the index gets skewed (by .1 or so -- not really significant but still). So, if I understood the literature correctly, I should find arms for the fuselage stations, multiply them by the weight in that station = moment. Then I can find CG by dividing total moment by total weight. And so on. The problem is that I simply cannot find arm values or arm centroids for passenger zones for CRJ-200 on Internet. Unbelievable, spent four days googling them -- just not there. :huh:

    I would appreciate if someone can clarify or help me locate the arms for CRJ-200. Thank you!

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