A couple of years ago I decided to get back into aeromoddeling, so I decided to visit a shop that I visited years ago........surprise surprise it was closed down but still had stock on the shelves and a telephone number in the window. It turns out the owner had died and his son was selling whatever he could, so I made him an offer of £80 (UK) for a 29 r/c and a 35 r/c, both new in the boxes, so I walked away with both of them AND 12 litres of fuel for £90 !!

The 35 is in my "Kestrel" autogyro doing storming service swinging a Graupner 12-6, throttles well, really easy to start, just 3 or 4 flicks after a carb prime, idles rock solid on Model Technics D1000 + extra 5% medicinal castor. I would have NO hesitation in buying another one.
The 29 is still in its box looking for a suitable home

Physically they look the same, I think the 35 is an over-bored 29.

Andrew