Thanks for the reply, unfortunatly I have been mis informed by Ripmax as they state: 'This outstanding servo is suitable for many applications, particularly those where the larger, heavier servos are unsuitable, such as large scale 3D aerobatic aircraft using petrol engines.'

http://www.ripmax.com/item.asp?itemid=P-S9351

I have spoken to ripmax since and they have said the oscilations may be due to high inertia in using long arms . Unfortunatly I have spent a lot of money on these sercos for the wrong application.

I am disscussing their return with the retailer.

Thanks again for your reply.
Rob