#### JETLAG03

##### Active Member

- Joined
- Jul 6, 2019

- Messages
- 159

- Location
- Virollet 17260 FRANCE

- Total Flight Time
- 300+ flexwing (pendulaire) newly trained on gyrocopter ((autogire)11h)

Hi folks.

I have read somewhere that rotor solidity is important regards security and handling etc, I think I read that 0.035 (ammended) was the magic number. If not exactly there is it better to have a solidity number higher or lower than this??

But, when doing the calculations does one take into account the total area swept by the blades or the area swept by the blades minus the area swept by the rotor bar.

This question then got me thinking as I have one set of blades and two rotor hubs giving me the option of a total diameter of 7.7m (25.3ft) or 8.3m (27.2ft).

Then further questions raised their ugly heads, the rotor disc loading, is this calculated to include or exclude the rotor bar swept area, and same question for the blade loadings, so, I played with an excel spreadsheet out of curiosity to see what magnitude of difference with and without the hub bar made.

here is what I discovered using kg 330(728lbs) and 450kg (992lbs) as for most of us here in France these are our limits. 500kg for the latest machines but not sure if that is also for we home builders??

I have read somewhere that rotor solidity is important regards security and handling etc, I think I read that 0.035 (ammended) was the magic number. If not exactly there is it better to have a solidity number higher or lower than this??

But, when doing the calculations does one take into account the total area swept by the blades or the area swept by the blades minus the area swept by the rotor bar.

This question then got me thinking as I have one set of blades and two rotor hubs giving me the option of a total diameter of 7.7m (25.3ft) or 8.3m (27.2ft).

Then further questions raised their ugly heads, the rotor disc loading, is this calculated to include or exclude the rotor bar swept area, and same question for the blade loadings, so, I played with an excel spreadsheet out of curiosity to see what magnitude of difference with and without the hub bar made.

here is what I discovered using kg 330(728lbs) and 450kg (992lbs) as for most of us here in France these are our limits. 500kg for the latest machines but not sure if that is also for we home builders??

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