Originally Posted by max1ci6
first thanks for answering (i am the original first poster) , would a Isonic 127 (2013) work the same in my conditions? I can get this more easily and save some money too .
The 127 is an excellent light winder at our weight (82kgs). But you will not be planing in 8kts - 10kts. A 9.6 on the 127 will be great and you'll be smoking in 10-15kts.
To get the most out of the Ultrasonic and plan in 8-12kts you will need a big rig, 11m + 550 mast + formula boom. But even with a 9.6 and big fin will plan earlier than 127.
Probably 1-2 knots in it at the low end with the same rig? With a big rig the Ultrasonic will be planing 3-4 knots earlier.
Good luck, either choice will put a smile on your dial.