At 11:31 05 April 2011, Eric van Geetsum wrote:
The Twin II of our club has an empty weight of 415 kg wich, with a max.

permitable total mass of 580kg leaves a max. payload of only
165kg.........

Now we are trying to solve this problem because we want to ad an extra
20 kg of payload. so the payload can be increased to 185 kg

the options are to:
replace the big heavy mainwheel and tyre by new TOST or Beringer
lightweight aloy wheels
Grind down the very thick (GROB style) gelcoat to a minimum
Replace the battery for a LiPO type
Remove radio and electro sink-clim indicator incl all electrica wiring.
Remove all pollstry.

And then?????????

Someone recognises this problem and who encouterd a solution??

Eric

Is this a Grob Acro II. The RAF operate those for the Air Cadets. We never
had a problem with weight with them, in fact the opposite. We were able to
put 242lbs on both seats, making a total of 484lbs (220Kg) payload. From
memory 415Kg seem rather a lot for an Acro II