SSW D.IV (not) contrarotating engine-propeller

[greybeard_52]

On the contrary of the real thing, the animation moves both in the same direction...?

[czech693]

The engine rotates  the same direction as the prop because it's a rotary engine, but the whole mess counterotates around the shaft on the firewall, which supposedly counteracts some of the torque.

 

https://en.wikipedia.org/wiki/Siemens-Halske_Sh.III

[greybeard_52]

1 hour ago, czech693 said:

The engine rotates  the same direction as the prop...

Sorry, I should have documented myself before making this unjustified complaint! I had stuck to the (wrong) idea that I got long ago, based on a modest information. In fact, the principle of the engine and the propeller rotating in opposite directions seemed to me even more effective, since it would have also reduced the overall gyroscopic effect. Evidently, I was wrong.? Thanks for the link too!

[ZachariasX]

14 hours ago, greybeard_52 said:

In fact, the principle of the engine and the propeller rotating in opposite directions seemed to me even more effective, since it would have also reduced the overall gyroscopic effect.

That is a common misrepresentation that you find circle quoted everywhere. Nobody back then cared about gyroscopic effect. The idea is to get twice the rpm from the engine, as power outpot scales with rpm. As run rotaries cannot run at high rpm, this is a fundamental drawback of their design and limits power. They felt it needed a solution for that and not for the gyro.

[greybeard_52]

3 hours ago, ZachariasX said:

The idea is to get twice the rpm from the engine...

Yes, I got that principle.

 

3 hours ago, ZachariasX said:

Nobody back then cared about gyroscopic effect.

Thanks for focusing on this. Indeed, it looks they had not yet realized quite many things about flight... Which is natural for pioneers...