RFC: 5020 fan mod

[Floyddotnet]

Hello Greg,

Based on your 5015 fan mod I derived another mod for 5020 fans.

features:

• same size as the 5015 fan mod
• 5.9 CFM (+10% compared to the 5015) using http://gdstime.com/product/?98_546.html
• better airflow due to fewer obstructions/constrictions (should compensate for the lower static pressure)

should i open a new repository or are you interested in a pull request?

[Floyddotnet]

here is a cut analysis between the 5015 and 5020 mod.

you should see that the curvature of the airflow has been reduced compared to the 5015 mod.

[Alexander-Sch]

I would like to try the modification with the 5020 fan. Maybe you can provide it, like you said, as a pull request or in a separate repository.