# The Aerodynamics of Gyroplanes

#### C. Beaty

##### Gold Supporter
Here it is; everything you’ve always wanted to know about gyroplane stability and then some:

http://www.caa.co.uk/docs/33/Paper2009_02red.pdf

It’s not easy reading for someone with a math background but a lot can be learned by simply reading the English and skipping the equations.

#### Brent Drake

##### Gyroplane Instructor
Some really nice reading chuck. Thanks

#### kolibri282

##### Active Member
When we discussed the Glasgow report Karl Bamforth tried to contact people inside the CAA to find out which part of the simulation program might be available to the public
(http://www.rotaryforum.com/forum/showpost.php?p=362922&postcount=15)
It seems that he has had no success. I wonder if anyone else could give it a go. It would be very helpful if especially the rotor part of the model were available to the public. Unfortunately the CAA seems to be a huge organization and I have no idea how to tackle the problem of tracking down a person who knows in which shelf the program currently rests (peacefully forever???....;-(

PS: it might be handy to have a link to this report in the same thread:
http://www.aero.hut.fi/pubs/reports/AALTO-AM-18elektroninenversio-2_1.pdf

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#### Jean Claude

##### Junior Member
Here it is; everything you’ve always wanted to know about gyroplane stability and then some:

http://www.caa.co.uk/docs/33/Paper2009_02red.pdf

It’s not easy reading for someone with a math background but a lot can be learned by simply reading the English and skipping the equations.
I could never understand how CAA correct conclusions obtained through calculations of entering false data (CG of the MAGNI VPM M16 is 0.19 m below the thrust line, not 0.019 m as it says) I think Pr HOUSTON had changed VPM M16. But this involves attaching 200 lbs at the top of the mast. This does not appear on the images or on the total weight. Magic? It seems to me that CAA said that HS acts very little in pitch stability, and Dr Seppo Laine said otherwise with the results of CAA (my poor english ?)
Jean Claude

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#### kolibri282

##### Active Member
It seems to me that CAA said that HS acts very little in pitch stability, and Dr Seppo Laine said otherwise with the results of CAA
You are right Jean Claude, Prof. Laine vividly contradicts the CAA opinion regarding effectiveness of a horizontal stabilizer with respect to pitch stability.

#### cbonnerup

##### More Senior Every Day
Thanks Chuck,

Would be interesting to compare these results with Mr. Hollmann's slightly more simplistic approach to the stability problem.

More grist for the mill.

#### Resasi

##### Gold Supporter
Dr Houston and the work he submitted was not very well regarded by some of the more clued up gyro fraternity in the UK.

#### 1946

##### Banned
When we discussed the Glasgow report Karl Bamforth tried to contact people inside the CAA to find out which part of the simulation program might be available to the public
(http://www.rotaryforum.com/forum/showpost.php?p=362922&postcount=15)
It seems that he had no success. I wonder if anyone else could give it a go. It would be very helpful if especially the rotor part of the model were available to the public. Unfortunately the CAA seems to be a huge organization and I have no idea how to tackle the problem of tracking down a person who knows in which shelf the program currently rests (peacefully forever???....;-(