On Apr 5, 7:31*am, 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

Eric,

That seems on the heavier end for a Grob 103 Twin II. I have the
weight and balance sheets form 3 different G103s in my folder here
(including one I'm a part owner of) and the average empty weight is
about 882 pounds (which is just about exactly 400kg). The lightest
one is about 870 pounds (around 395kg). This is with standard
instruments and a single battery under the rear seat.

Two obvious questions:

- Has the ship had major repairs?
- Is there some heavy ballast installed?

Finding 20KG of extra payload sounds pretty unlikely unless there is
something strange going on...

Erik