Hi I am getting my mum to try and suss it out
He has radio controlled electric planes and often talks about a servo?! whatever that is
The typhoon slope soarer looks most like the things he has but I would say his are smaller does it come in different sizes? I would say wing span of about 1 meter
He has a room where he works on the planes so I presume he builds up the planes
Hope this offers a bit more insight