how can we open the Tiger?
Step 1: Remove the Tiger tracks
http://www.rctankwarfare.co.uk/forums/v ... 18&t=11460
Then lay the tank on its back. Seven screws have to be removed. Three of them are located on the bottom of the lower hull.

Two are located under the track guards on the right side.

Two are located under the track guards on the left side.

Put the Tiger back on its wheels. Remove both tube clamps:

Remove the tubes from the air intake. This can be hard. Sometimes they are fixed with glue.

Now you can remove the upper hull.
Assembling works the other way round.
Greetings
Birger
For a lot more help with your Heng Long Tiger I tank, follow the below link ...
http://www.rctankwarfare.co.uk/forums/v ... 18&t=11459