Sir, – The wind farm proposed for a site between Scorton and Danby Wiske has a hurdle to overcome.

It would be positioned under the flight path used by Chinooks and other MoD helicopters flying between RAF Dishforth and the MoD training area in Northumberland. Chinocks often fly at 500 feet for training purposes.

The top of the turbine blades by the energy company could reach 450 feet.

I have experience that such small margins in height can be critical, as my Sea Vixen pilot and I found on a dark and misty night 55 years ago when I was in the Fleet Air Arm. We were practising an emergency ‘silent’ return to base when we flew in to the top of a tree. The tree was later found to have grown above the permitted height for its position close to the flight path.

The wind farm site is on the cross country navigation route used by student pilots from RAF Linton on Ouse and is only 100 yards from the spot a trainer aircraft crashed after being abandoned by its student pilot.

STEPHEN FURNESS Great Langton, Northallerton