Garmin Pilot Weight & Balance

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TonyL
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Garmin Pilot Weight & Balance

Unread post by TonyL » Tue Sep 01, 2020 3:51 pm

I want to set up the Weight & Balance for a Jabiru J430 in the Garmin Pilot app. I have a couple of challenges and I am not getting a timely response from Garmin support. Perhaps someone here can help me?

Negative Station Arm Length/Distance:
The front seats of the J430 are forward of the aircraft empty COG. When entering the Station information for this it will not allow you to enter an arm length with a negative value. Anyone else had to deal with this and found a way to deal with it?
Negative Arm.png
Envelope Entry:
When entering the forward and aft envelope details the units (Weight in Kg & Moment in Kg.mm) in the form make sense and are correct. However, upon completing the form the graph showing the envelope uses different units for the moment. However, there is no rational to these units as the chart is unitless and some typical conversions to other units (Garmin Pilot has a habit changing units on its own) make no sense of the result shown on the graph. The nett result is that the graph is ‘wrong’ and so any W&B calculations later are miles of off the envelope resulting in a calculation that does not comply.
Moment.png
Thanks in advance!
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Re: Garmin Pilot Weight & Balance

Unread post by darryltarr » Tue Sep 01, 2020 5:47 pm

Can you PM me your J430 details and I will sort it out for you.

Empty Weight and ARM
FWD CG Limit
Maximum Weight
AFT CG Limit

Thanks,

Darryl
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Re: Garmin Pilot Weight & Balance

Unread post by Arch » Tue Sep 01, 2020 9:02 pm

Negative Station Arm Length/Distance:
The front seats of the J430 are forward of the aircraft empty COG. When entering the Station information for this it will not allow you to enter an arm length with a negative value. Anyone else had to deal with this and found a way to deal with it?

Negative Arm.png
[/quote]

Your stations ( arms) are usually measured from a datum in front of the craft going towards the tail, not from the aircraft's c of g
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Re: Garmin Pilot Weight & Balance

Unread post by Orthin Opter » Wed Sep 02, 2020 8:52 am

Arch wrote:
Tue Sep 01, 2020 9:02 pm
Your stations ( arms) are usually measured from a datum in front of the craft going towards the tail, not from the aircraft's c of g
Correct. So instead of working from the aircraft empty CG position, as this position is a variable. Create a datum point from a known position such as 1000mm ahead of the wing leading edge / firewall / propeller flange etc then all values should be positive behind that Datum Point.
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TonyL
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Re: Garmin Pilot Weight & Balance

Unread post by TonyL » Wed Sep 02, 2020 12:32 pm

Problem solved. Firstly, there is nothing unusual about negative arms on a W&B sheet or calc. On the Jab the datum is on the leading edge of the wing, not ideal but it works for them. The front seats are forward of this point and hence the negative arm.

The problem comes down to the Android version of the Garmin Pilot (GP) app. It does not accept negative values for the arm. Ahhhh, but the iOS version does. So, install GP onto an iPad (borrowed), login with GP credentials, setup aircraft with W&B, sync aircraft to GP cloud, open app on Android device, sync down from the GP cloud and WALLAAA, it works.
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Re: Garmin Pilot Weight & Balance

Unread post by Arch » Wed Sep 02, 2020 10:06 pm

Interesting. Any idea why they didn't simply add some distance to the leading edge and make all stations a positive value?

Entering a positive station but a negative weight wouldn't give you the same numbers?
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Re: Garmin Pilot Weight & Balance

Unread post by samlrs » Wed Sep 09, 2020 11:27 am

Interesting. Any idea why they didn't simply add some distance to the leading edge and make all stations a positive value?
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Entering a positive station but a negative weight wouldn't give you the same numbers?
Probably the numbers differ and that's why they couldn't include them

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