Takeoff and landing calcs

[midlifeflyer]

I'm curious - has anyone put together a simple spreadsheet or script based on the POH numbers for calculating takeoff performance via either simple inputs or even a chart rather than the graph in the POH? I've been thinking of experimenting with one but want to avoid re-inventing the wheel.

[piperpainter]

This is what I use! I added the numbers in the red as estimates because the POH didn't have data in those areas! I have this in an Excel sheet if you'd like it. I printed it and then laminated it. So I have a "Takeoff data chart!" If I can takeoff in a place I can land there so I never worry about landing distance!

[BorealOne]

If you fly an Ovation, there's an app for that:

 

https://itunes.apple.com/us/app/m20r-poh/id317842551?mt=8

[carusoam]

Interesting app.

The picture indicates an O3.

I tried to get additional info but could not access it.

Looks like you would need to verify it's results against your actual POH.

I would like to buy something like that direct, officially from Mooney!

Best regards,

-a-

[midlifeflyer]

This is what I use! I added the numbers in the red as estimates because the POH didn't have data in those areas! I have this in an Excel sheet if you'd like it. I printed it and then laminated it. So I have a "Takeoff data chart!" If I can takeoff in a place I can land there so I never worry about landing distance!

I absolutely agree with your comment about not needing a landing distance chart, although there may be circumstances, such as high density altitudes where that might be a consideration.

I would like a copy of the excel file if I may. If it can't be posted, let me know how to get it.

Btw, what model was this based on?

[Bob - S50]

I'm curious - has anyone put together a simple spreadsheet or script based on the POH numbers for calculating takeoff performance via either simple inputs or even a chart rather than the graph in the POH? I've been thinking of experimenting with one but want to avoid re-inventing the wheel.

I wrote an HTML file for our airplane ('78 J).

 

Hard coded info: max gross, empty weight, empty pitching moment, $/hour for hourly rate, adjustment factors for speed and burn.

 

Data entered on the form: airport, PA, Temp, HW, $/gallon, front seat weight, back seat weight, baggage weight, hat shelf weight, gallons at start up (it subtracts 9 pounds for STTO), climb speed (estimated performance for 100, 110, 120k), cruise altitude, power setting (75, 65, 55).

 

Output: CG graph, takeoff roll, time to altitude, distance to altitude, fuel burn to altitude, power settings (from the POH), $/mile at cruise.

 

If you know how to modify and save an HTML file you can change the hard coding to match your plane.  Most of the values are near the top of the file but the cost/hour is near the bottom in a line that contains this: 25 * RPM/2700.  Since we use $25/hour based on tach time not hobbs, I adjust the cost for lower RPM.

 

I've attached the latest version if you want to play with it.

N201CB Takeoff Calculator v3.5.html

[piperpainter]

I

 

I like it! You can't post the spreadsheet file anywhere can you? (If not can I pm you my email?) I'd like to print one, laminate and use it if you don't mind?

If you want to print it off you can click it and then save it. Then print it. If you want the actual spreadsheet that has weight and balance and some other stuff then shoot me a PM with your email! 

[Dave Marten]

Nice work Bob!

 

Great .html file. Do you mind if I carve it up and adapt it for my K?

 

It'll be on my list of rainy-day fun things to do!

 

Thanks

[Bob - S50]

Nice work Bob!

 

Great .html file. Do you mind if I carve it up and adapt it for my K?

 

It'll be on my list of rainy-day fun things to do!

 

Thanks

Thanks.  Knock yourself out.  Have fun changing the code.  I didn't finish all the comments but hopefully there are enough there that you can figure it out.

 

Bob

[midlifeflyer]

1 hour ago, Hyett6420 said:

hi, just fund this when looking at a take off calculator.  i KNOW  this is a daft question but I have an 86J which has a max takeoff of 2880 or something like that.  does anyone @Bob - S50 know how to change from the lower Js max take off weight to mine?  

andrew

Not daft at all, BUT you will have to work around the source code and make the changes without breaking something. Not everyone is comfortable or competent doing that. You also need to understand weight and balance. If I recall correctly, the max gross increase also resulted in a small change of the arm values, so you need to change those as well. And, of course, verify it against manual calculations based on your POH. Here's the basics on this file:

Download the file and open it in a text editor. The numbers you want will begin with the word var - that just means a variable is being declared (given a name, usuallly something recognizable) and given a value. So, for example, in the "DEFAULT VALUES" section of the file, you will find:

//** The following line should be changed to reflect the maximum gross weight limit for your aircraft **

var Gross = 2740; // **

//** The following line should be changed to reflect the actual aircraft empty weight **

var EmptyWt = 1780.1; // **

//** The following line should be changed to reflect the actual aircraft pitching moment in in-lbs/1000 **

var EmptyMoment = 79.96; //

There are other variables that are probably relevant, including AftArmLimit and FwdArmLimit. Court of Appeals really kind ned to know how to work in a foreign language

 

[midlifeflyer]

2 hours ago, Hyett6420 said:

@midlifeflyer you are a genius.  Thank you. Looks like I am off to play coding.   

Not a genius. Just a bit of a geek.

[toto]

I know this post is nearly 10 years old, but just wanted to chime in here and say thanks to @Bob - S50 for the html takeoff calculator.

I hadn't seen this before, and was growing tired today of squinting at the performance charts in my flight manual - found this post in my search, and voila

 

[carusoam]

5 minutes ago, toto said:

I know this post is nearly 10 years old, but just wanted to chime in here and say thanks to @Bob - S50 for the html takeoff calculator.

I hadn't seen this before, and was growing tired today of squinting at the performance charts in my flight manual - found this post in my search, and voila

 

Stand by for a newer thread on the same topic…

But, with more detailed calculations… done for you…

 

-a-

Find this thread from PatrickF…

Check the details prior to use, as always…

Where is Bob - S50 lately?

 

[toto]

3 minutes ago, carusoam said:

Stand by for a newer thread on the same topic…

But, with more detailed calculations… done for you…

 

-a-

Sounds interesting   I'll be watching for it.

[carusoam]

1 minute ago, toto said:

Sounds interesting   I'll be watching for it.

Update my post above….

-a-