A few more comments on the RAF.
Go to this site and click on the title on the top of the first page, that will take you to the forums where there will be enough reading on the RAF to keep you busy for years.
www.rotaryforum.com/index.php
I was involved with RAF in 1991 when they first started, the plan was to add the Gyro to my flight training school as I already had both airplanes and helicopters. ( R22 on floats Whirly... ) anyhow to make this short, I was concerned about the pitch instability and the factory refused to even add a HS, so we parted company very quickly...to this day they still refuse to improve their design despite many deaths due to the thing bunting over in flight.
I recommend Roger Savage very highly, he in my opinion is the guy to see on that island you guys share with many illegal immigrants.
Have a good look at the picture of that green RAF and note the lack of a horizontal stabalizer and how weird that looks, nevermind the need for one.....then go see how many flying machines lack a H.S...you can start with birds last time I saw one it had a big H.S. and whoever designed it must have put a tail on e'm for good reason....
...or you could pull the feathers off a set of darts and see what happens to how the dart flys....
At your service with advice to keep you alive forever.....
Chuck E.