I have no idea what a 250DaN line with a 1kg camera rig attached would do to a 3 tonne helicopter and I never want to find out! After a pilot flew his machine into a crane at Vauxhall on the 16th of Jan 2013 the sky clutter in London became a matter of national debate. 16,000 helicopter movements were recorded in the London CTRs (Control zones) in the last year.
This map shows where the helicopters fly in London.
The river is used a corridor with a max height of 2,500 feet (830m) down to surface (which I understand means 500′ or 160m). I assume kite flying (where permitted, and that’s another story) is effectively limited to 100′ or 30m under the The Air Navigation Order 2005, Article 97 (1) (3):
“Without the permission of the CAA: a kite shall not be flown at a height of more than 30 metres above ground level within the aerodrome traffic zone of a notified aerodrome during the notified operating hours of that aerodrome.”
So with a kite flying at 100′ or 30m ASL (Above Surface Level) there should be separation of 130m or 400′ between it and any helicopter observing the 500′ proximity rule. Except for emergency use and aircraft in transition. Its the exception that bothers me: most of my local helicopter traffic is air ambulance and police operation.
Popular kite flying spots in London are all overflown by helicopter traffic with a minimum flying height of ‘SFC’ (surface- which I take to mean 500 feet) Parliament Hill (9) is inside both London CTR and London City CTR, Blackheath (1) is inside London City CTR, Wimbledon Common (20) is cut by route H7 and is used as a holding area, Richmond Park (16) is cut by route H4.
KAP discussion group thread on KAP in London here
How I know how high my kite is: here
Kite Society of GB tips & rules for Kite Flying in the UK here
CAA Rules for Kite Flying (Section 1 Part 22 Article 164 ) in the UK here
KAP in London is an appealing prospect but keeping clear of the ‘copters is going to be tricky!