Can anyone answer this for me?

Nope sorry. I did notice the same phenomenon with the Star Wars AT-AT.

Some interesting concepts here. I like to run this model from an external compressor (which I can hook up to different models), but it's nice to have an all-in-one solution. There should definitely be enough space for one if you remove the manual pumps.

Can anyone tell me why there is a black or a yellow box version of this set? Also why does it say 11-99 on the yellow box,there has to be a story to this one! Which box is more sought after as well?

It's a 2003 copy of the set. Many 2003 sets across a variety of themes had the 99 age limit, obviously as a subtle nod to AFOLs. They stopped doing it in 2004 though. The Technic box art was also changed to be black in 2004 and the design is still in use today.

It's a 2003 copy of the set. Many 2003 sets across a variety of themes had the 99 age limit, obviously as a subtle nod to AFOLs. They stopped doing it in 2004 though. The Technic box art was also changed to be black in 2004 and the design is still in use today.

Could have thought of that

Thanks for the clarification

Anyone know who designed the famous 8455?

how can I open the file file "LXF"?

LXF is a Lego Digital Designer file. Go Download Lego Digital Designer from the Lego website and then you can open the file.

why the program "Lego Digital Designer" does not open the file "LXF"?

as soon as I open it for me: try reinstall LDD. see the read me file for help, or go to

http://ldd.lego.com/support/

No idea. You might try asking in the Lego Digital Designer forum.

Are you sure LDD is not running already?

If you start LDD, THEN try to double click on a .lxf file in your file browser, you get this error. Either close LDD, or open the file from it.

Okke I'll try thank you very much

My favorite set this one, I have actually 2 of them :D

A compressor is a good idea, but you should think about an air tank also.

Found somethin on youtube:

Not that i like the placement of his air tanks, but it would improve the playability much if you could implement one.

I honestly think it should be manual, how lazy can you be? It works faster and looks better with a manual pump anyway, no use trying to make a motorized compressor IMO.

I tried with an external Pump/compressor and airtank and found better results just using the compressor on its own and no airtank

I used the RC motor - I also fitted the same pump to my 8421:

I never fitted it into the 8455 but now I think I will have to give it a try.... !