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weight and balance question

 
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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 12:02 pm    Post subject: weight and balance question Reply with quote

Hi all,

My mech and I are looking to do an new weight balance. Currently, I've replaced the 80 pound gill battery with 2 oddesy's up top in the old battery box.

Before making the change, there was 55pounds in the tool box, 40 pounds in the IFF area, and the 80 pound gill. It feels nose heavy compared to my other l29, and another one I have flown.

The new config, removed the 55 out of the box, and the new oddysey's and the wiring adds up to about 53. negligible change.

We looked at he way the w&b was done, and the datum used appears to be the nose wheel center. That puts almost 200 pounds in the "negative" of the w&b calc. We looked in the book and the diagrams are difficult to read, but it would seem the datum is at the nose cone tip, or at the bulkhead right behind it.

My question, anyone know the approved area for the datum?

thanks

Skidmk


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PostPosted: Wed Jul 13, 2016 12:05 pm    Post subject: weight and balance question Reply with quote

R model or c? Tool box??

Sent from Yahoo Mail on Android

Quote:
On Wed, Jul 13, 2016 at 15:02, skidmk
<skidmk(at)gmail.com> wrote:
--> L29-List message posted by: "skidmk" <[url=javascript:return]skidmk(at)gmail.com[/url]>

Hi all,

My mech and I are looking to do an new weight balance. Currently, I've replaced the 80 pound gill battery with 2 oddesy's up top in the old battery box.

Before making the change, there was 55pounds in the tool box, 40 pounds in the IFF area, and the 80 pound gill. It feels nose heavy compared to my other l29, and another one I have flown.

The new config, removed the 55 out of the box, and the new oddysey's and the wiring adds up to about 53. negligible change.

We looked at he way the w&b was done, and the datum used appears to be the nose wheel center. That puts almost 200 pounds in the "negative" of the w&b calc. We looked in the book and the diagrams are difficult to read, but it would seem the datum is at the nose cone tip, or at the bulkhead right behind it.

My question, anyone know the approved area for the datum?

thanks

Skidmk

--------
Mike "Skidmk" Bourget
Ottawa, Ontario


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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 12:15 pm    Post subject: Re: weight and balance question Reply with quote

c model tool box is the old battery box, that had been replaced.

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PostPosted: Wed Jul 13, 2016 12:31 pm    Post subject: weight and balance question Reply with quote

Where is the new battery box

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On Wed, Jul 13, 2016 at 15:15, skidmk
<skidmk(at)gmail.com> wrote:
--> L29-List message posted by: "skidmk" <[url=javascript:return]skidmk(at)gmail.com[/url]>

c model tool box is the old battery box, that had been replaced.

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Mike "Skidmk" Bourget
Ottawa, Ontario


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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 12:36 pm    Post subject: Re: weight and balance question Reply with quote

as per the pic, on the nose compartment next to the O2 Cyl's

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PostPosted: Wed Jul 13, 2016 12:44 pm    Post subject: weight and balance question Reply with quote

Call.me.on confused
5639408600
On July 13, 2016 3:20:23 PM "skidmk" <skidmk(at)gmail.com> wrote:

Quote:


c model tool box is the old battery box, that had been replaced.

--------
Mike &quot;Skidmk&quot; Bourget
Ottawa, Ontario


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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 1:00 pm    Post subject: Re: weight and balance question Reply with quote

sorry for those I"ve confused. To keep it simple. We are looking for the DATUM used to do a weight and balance. I cannot tell for sure (my books are tough to tell from) but it looks like the datum is at the tip of the nose cone, or it is at the bulkhead where the nose cone attaches.

comments?

some have a readable copy of the datum and measurement diagrams.?


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Mike "Skidmk" Bourget
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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 1:02 pm    Post subject: Re: weight and balance question Reply with quote

sorry for those I"ve confused. To keep it simple. We are looking for the DATUM used to do a weight and balance. I cannot tell for sure (my books are tough to tell from) but it looks like the datum is at the tip of the nose cone, or it is at the bulkhead where the nose cone attaches.

comments?

someone have a readable copy of the datum and measurement diagrams.?


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PostPosted: Wed Jul 13, 2016 1:48 pm    Post subject: weight and balance question Reply with quote

We need more details to help with w/b.
Is the IFF unit still in the compartment . If not what if anything is
there. Original battery compartment was in left top shelf in nose
adjacent to oxygen bottles. Are bottles still there? You eluded to making
battery compartment into a tool box. Where then is the battery now.
On July 13, 2016 16:05:12 "skidmk" <skidmk(at)gmail.com> wrote:

Quote:


sorry for those I"ve confused. To keep it simple. We are looking for the
DATUM used to do a weight and balance. I cannot tell for sure (my books
are tough to tell from) but it looks like the datum is at the tip of the
nose cone, or it is at the bulkhead where the nose cone attaches.

comments?

someone have a readable copy of the datum and measurement diagrams.?

--------
Mike &quot;Skidmk&quot; Bourget
Ottawa, Ontario


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=458143#458143




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PostPosted: Wed Jul 13, 2016 2:22 pm    Post subject: weight and balance question Reply with quote

Did you remove the weights out of the tail just below the rudder in the tail cone I think they are?

Sent from my iPad

Quote:
On Jul 14, 2016, at 6:02 AM, skidmk <skidmk(at)gmail.com> wrote:



Hi all,

My mech and I are looking to do an new weight balance. Currently, I've replaced the 80 pound gill battery with 2 oddesy's up top in the old battery box.

Before making the change, there was 55pounds in the tool box, 40 pounds in the IFF area, and the 80 pound gill. It feels nose heavy compared to my other l29, and another one I have flown.

The new config, removed the 55 out of the box, and the new oddysey's and the wiring adds up to about 53. negligible change.

We looked at he way the w&b was done, and the datum used appears to be the nose wheel center. That puts almost 200 pounds in the "negative" of the w&b calc. We looked in the book and the diagrams are difficult to read, but it would seem the datum is at the nose cone tip, or at the bulkhead right behind it.

My question, anyone know the approved area for the datum?

thanks

Skidmk

--------
Mike &quot;Skidmk&quot; Bourget
Ottawa, Ontario




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=458131#458131












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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 3:55 pm    Post subject: Re: weight and balance question Reply with quote

The iff compartment, currently holds, an 80 pound gill that is dead. Together with about 40 pounds of ballast.

the original battery box, (rebuilt into a tool box) is now holding two Odysey 925's. (weight of 53 pounds) these batteries, will now be the onboard batteries, and they have replaced 55 pounds of lead ballast that was in the battery/tool box.

I am unaware of plates in the tail. in the tail cone?

thanks


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Mike "Skidmk" Bourget
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skidmk



Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario

PostPosted: Wed Jul 13, 2016 3:56 pm    Post subject: Re: weight and balance question Reply with quote

The iff compartment, currently holds, an 80 pound gill that is dead. Together with about 40 pounds of ballast.

the original battery box, (rebuilt into a tool box) is now holding two Odysey 925's. (weight of 53 pounds) these batteries, will now be the onboard batteries, and they have replaced 55 pounds of lead ballast that was in the battery/tool box.

I am unaware of plates in the tail. in the tail cone?

thanks


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PostPosted: Wed Jul 13, 2016 5:30 pm    Post subject: weight and balance question Reply with quote

If you putting the 2 batteries back in original battery container and then
put that container back in the battery hole you should be fine. Then put
the IFF box back and the weight will be so close to original there should
be no problem
On July 13, 2016 7:04:47 PM "skidmk" <skidmk(at)gmail.com> wrote:

Quote:


The iff compartment, currently holds, an 80 pound gill that is dead.
Together with about 40 pounds of ballast.

the original battery box, (rebuilt into a tool box) is now holding two
Odysey 925's. (weight of 53 pounds) these batteries, will now be the
onboard batteries, and they have replaced 55 pounds of lead ballast that
was in the battery/tool box.

I am unaware of plates in the tail. in the tail cone?

thanks

--------
Mike &quot;Skidmk&quot; Bourget
Ottawa, Ontario


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=458149#458149




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