Heres a tip I discovered by accident - thought I would share it with you all.

The smoke tank in my model was located in my model just in front of the CofG and I noticed that the 3d ability of that model improved as the diesel (smoke fluid) was used up - not surprising as the GofG moved backwards - but it was a PITA to land with the CofG that far back.

So - moved the smoke tank to behind the CofG and got excellent 3d but as the smoke was used up the characteristics got gradualy more tame.

Put in 2 smoke tanks - 1 in front of the CofG and one behind - for take off the front tank was filled and once airborne the smoke pump is used to pump the diesel into the aft tank giving lively performance - for landing just pump the fluid (servo switchable festo fitting) back into the forward tank - easy landings.

Also useful for finding the optimum CofG - pump fluid backwards and forwards until optimum CofG is found - land - measure the balance point - empty the fluid - use lead or reposition stuff to get that balance back then you can use your smoke pump again for its intended purpose!!!

ps - two 12oz tanks fit in nicely in a WH Ultimate plus a 24 oz petrol tank

David.