Fuel Bladders/Ferry Tanks

[Blueadventures]

8 minutes ago, Moneybox said:

I've not checked it out however the tank is right up against the back of the seat so there'd be little difference to the balance. The wife and I will only total 125kg so we'll have lots of weight to spare but it's a case of where to put it. 310kg tare weight and max 550kg.

Best that you read the moments on the aircrafts w&b sheet; it will show the info about the seats and the fuel tank behind and the effects of differing mass weight at those positions.  It's important to know. Cheers.

[Moneybox]

8 minutes ago, facthunter said:

Your basic lack of how W&B works is showing, space.

Please explain?

I just stated the tank is right against the back of the seat so there'd be little difference with the tank full or empty.

[facthunter]

Yes it's BEST not to assume. but any mass which is situated IN the Range of allowable CofG  won't take it Out of the range  regardless. Wing mounted tanks often fall into this category. It's wise to KNOW where your actual C of G is. It can affect your performance. Slightly tail heavy is more efficient. TOO tail heavy is the most dangerous. Nev

[facthunter]

 Moneybox ,space is for spacey.  A further note, all masses act through their individual CofG's.  Nev

[skippydiesel]

1 hour ago, Moneybox said:

Please explain?

I just stated the tank is right against the back of the seat so there'd be little difference with the tank full or empty.

You are possibly correct, in your assumption of little/nil change tank full/empty BUT in this case (aircraft W&B) you should not assume, it could be dangerous.

 

The data on your aircraft should be in your Pilot's Operating Handbook (POH). If not, could be on the maker's web site, or contact the manufacturer for the info, or Google its specifications.

 

If you have OzRunways, there is a section (Settings-Aircraft- W&B) where you can load all your W&B data. Then in flight planning , you go to W&B, put in your load weight & its distribution - the attached chart will then show you in/out of balance. If out of balance (or overloeded) you can then adjust location/quantities to get back in W&B.

[spacesailor]

It is agreed .

W&b in balance.  From Max forward on take off .

Then on that flare you are at minimum w&b .

Not when you need that suddenly tail heavy .

It seems safer to be the other way around .

spacesailor

[BrendAn]

7 hours ago, Moneybox said:

I've not checked it out however the tank is right up against the back of the seat so there'd be little difference to the balance. The wife and I will only total 125kg so we'll have lots of weight to spare but it's a case of where to put it. 310kg tare weight and max 550kg.

should be able to download w&b sheets for your model of aircraft from the manufacturer.   do the calculations before each flight .

[BrendAn]

1 minute ago, BrendAn said:

should be able to download w&b sheets for your model of aircraft from the manufacturer.   do the calculations before each flight .

sorry blue. i  missed your post about the same thing.

[facthunter]

You need the actual  Aircraft  basic wt and Index to start from. I made a graphical chart for  the Citabria. It had a lot of room behind the rear seat and had to make sure the weight didn't end up too far  back. . Nev

[Underwood]

9 hours ago, skippydiesel said:

I can't imagine carrying extra fuel, in cans/bladder, is illegal, unwise? perhapes. Aircraft have been flown across the Pacific with ferry tanks/bladders many times. Of course there may be negative insurance implications if a claim is lodged.

Bladder type ferry tanks are certificated for that purpose not the same for a couple of jery cans though.

Many people do it though including myself.

[facthunter]

It's all pretty  risky. Leak proof well secured and vented externally  should be the go. Nev

[Arron25]

16 hours ago, Moneybox said:

I'll only have 60L in the one tank. I've thought about a metal outboard motor tank that can be plugged in and jus flick the pump switch when needed but weight and balance come to play.

When I bought Soni, it came with a 20l 'passenger' that was strapped in on the front seat whenever I was solo.... A jerry can with a quick connect outboard motor fitting in the lid (Extra 50% fuel..) electric pump under the seat to do this transfer to main tank