Or you could even have a 3 line system and make use of the throttle during flight.
If Steve111 sees this he just may post a link to his vertical take off throttled control line 'Flounder'!
Steve do you read, over .......
P.S. Think I found it, sorry Steve.
New linky supplied -
https://www.youtube.com/watch?v=Y1DFQ2VJ63w