RE: GSP hellcat????????
To make the Zinger look more realistic, I rounded the tips myself then re-balanced. I doubt it made much difference to the performance of the prop but makes a huge diff to the way it looks. I get about 5200 RPM that 10,400 internal with the 2:1 gear ratio. The engine seems very happy at the speed.
Sound is awesome and low level high speed passes look very scale. Vertical is acceptable but flight envelope is more scale-like than typical sport or aerobatic models.
Thanks for the prop info. They are beutiful. But very pricey compared to the Zinger (44.00 for complete set baldes and mouning plates). I will recomend them to my friend building a Ziroli B-25 assuming they have models that fit G-45 engines.