W&B calculations

[Dan Michaels]

I was going over the log books and updating the W&B info.

W&B dated 4-27-57 original EWCG 18.7 EW 770 UL 430

TCDS says EWCG range +14.8 to +17.9
TCDS Center of Gravity CG range +14 to +20

If I use the EW CG range it is out of range right from the factory I think.

Why is the TCDS different on EW and just CG?

What do others have for a EWCG?

Does anyone have a W&B worksheet? I have the numbers for CG but not any Fuel, seat, or baggage measurements.

Dan

[Guest]

Re: W&B calculations

Hi Dan, if ewcg falls out of range you have to make a loading schedule that's all.


Empty Weight C.G. Range Landplane: (+15.3) to (+18.5)
Seaplane: (+15.9) to (+19.0)
When empty weight C.G. falls within the pertinent range, computation of critical fore
and aft C.G. positions is unnecessary. Ranges are not valid for non-standard
arrangements.

Check you empty weight too, I bet the a/c is heavier than it says in log.

Dave

[Guest]

Re: W&B calculations

I was going over the log books and updating the W&B info.

W&B dated 4-27-57 original EWCG 18.7 EW 770 UL 430

TCDS says EWCG range +14.8 to +17.9
TCDS Center of Gravity CG range +14 to +20

If I use the EW CG range it is out of range right from the factory I think.

Why is the TCDS different on EW and just CG?

What do others have for a EWCG?

Does anyone have a W&B worksheet? I have the numbers for CG but not any Fuel, seat, or baggage measurements.
Dan

Dan look in the tcds all that info is in there in teh equipmenr lis and in the main text.

Example below, the arm is in red

Number of Seats 2 (+23)
Maximum Baggage Landplane: 50 lb. (+40):
Seaplane: 30 lb. (+40)
Fuel Capacity 18 gal. (12 gal. in fuselage (-9) and 6 gal. in wing (+24)). See NOTE 3.
Oil Capacity 4 qt. (-21)

also from eqipment list section, arm in red again

19/ 207. Two main wheel-brake assemblies, 6.00-6, Type III Firestone Model 6C3HB +4 lb. (+2)
20/ 208. Wheel streamlines (dwg. A-9015 or A-9016) 6 lb. (+2)

[Dan Michaels]

Re: W&B calculations

Thanks I see it now. I just needed to know what to look for.

I just thought it was odd that the EWCG was out of range from the factory.

Dan

[astjp2]

Re: W&B calculations

Dan, do a search on W&B, this has been discussed vastly. Only a few airplanes were weighed so most of ours are much heavier. Tim

[lfries]

Re: W&B calculations

If I recall correctly there is an EWCG range that if the EW falls within you only neeed to comply with weight limits as the CG cannot be out of range when loaded.

[Robert Lees]

Re: W&B calculations

There is nothing like re-weighing YOUR aircraft to get an up-to-date W&B schedule.

In the UK, there is a strong recommendation to re-weigh every ten years. (I don't know what the FAR's state or suggest.)

If your last W&B was done in 1957...my weak brain makes this 32 years ago.

If you are a BC12D, I have an excel worksheet at http://www.taylorcraft.org.uk/cg-vb-usg.xls that has the basic data (you might need to convert Imperial gallons to US gallons, but I'm sure you can resolve that).

LLoyd is right in that if your empty weight cg is satisfied, you cannot exceed the fore and aft cg limits as long as you don't exceed the weight. Example: if your empty weight is 800lbs and your gross weight is 1200 lbs (a difference of 400 lbs); as long as you don't put more than 400 lbs in their respective places (fuel, persons & baggage) then you will not exceed the fore-and aft cg limits (or indeed the 1200 lbs gross weight).

Does that make sense?
The mor I look at wot I rote, it maks les sens.

[flybikefarm]

Re: W&B calculations

Lets see, 2009 - 1957=52 years.

[Len Petterson]

Re: W&B calculations

When I first bought this terrific liitle bird I sat down and did a WB.
It was he most pleacent suprice I had after payed for her. Unless you load to max and when some in a realy dumb way like as far after as possible in a extra long bagage compartment (as I seen in one bird). No way can you go to far forward or after with your load.
Like the ozzies say: No worrys Mate!
But like with any aircraft : KNOW YOUR NUMBERS!
Len

[Robert Lees]

Re: W&B calculations

If you are a BC12D, I have an excel worksheet at http://www.taylorcraft.org.uk/cg-vb-usg.xls that has the basic data (you might need to convert Imperial gallons to US gallons, but I'm sure you can resolve that).

I've updated the spreadsheet to calculate in US Gallons.

[Dan Michaels]

Re: W&B calculations

I've updated the spreadsheet to calculate in US Gallons.

Robert,

I used the Worksheet but the wheels weight had a formula there instead of a number. I deleted the formula and it seems to work other than the weight of the plane in the information section.

I cannot get in CG with a passenger and little fuel. I will have to measure the tail wheel. It does have a Scott tail wheel that I am told is bigger than the original hard one.

I have a metal prop off a C-85, maybe that would help.

I could not upload the file I could email it to you.

Dan

[Robert Lees]

Re: W&B calculations

Dan, the yellow boxes are for you to enter the data for your particular aircraft. I put in mine as an example.

Rob

[Dan Michaels]

Re: W&B calculations

Dan, the yellow boxes are for you to enter the data for your particular aircraft. I put in mine as an example.

Rob

I know, but the data that was in the Wheel weight box was a formula. It said 875# but the insert line had a formula rather than just a number. If you look at the PDF you will see it looks right in the part where you enter it but the total weight elsewhere is lower than the wheel weight.

Dan

[Dan Michaels]

Re: W&B calculations

I may have figured it out I took out the fuel in the test box and it comes up right now.

Dan

[Robert Lees]

Re: W&B calculations

I'm lost. I can't see 875 lbs anywhere on your pdf? Can you give me a cell reference from my spreadsheet?

I entered your pdf details into my spreadsheet and got (not unsuprisingly) the same outside-rear-cg limit.

I make your empty weight 785 lbs, but you're still aft of the rearmost cg limit.

My comment:
1. Your tailweight is very heavy...are you sure the aeroplane was level (tailwheel about 3 feet off the floor) when you measured it?
2. Your mainwheel weight seems light...see comment in (1) above.

Photo below shows level attitude for W&B measurement.

Rob