Owen and all, Yes, the ventral fin was installed to deal with prop wash and torque. Studying what was available on the NACA pages through NASA gave me several ideas, extending the vertical stab, increasing rudder size, or adding a ventral fin. The ventral fin is slightly forward of the vertical tail to better counter the corkscrew effect of propwash and allow the fin to be taller. It works extremely well. Golaith needs much less rudder in steep climbs, and cruise is straight as an arrow, regardless MAP setting. It also has a positive effect on approaches to stall. On the downside, fast descents/low power descents need rudder in the opposite direction, more so than before. I suspect the fin would have a positive impact on spin resistance based on the plane's new approach to stall characteristics, BUT THE KR IS PROHIBITED FROM SPINS anyway. No plan to test this theory out. If I were to do it again, I would probably angle the fin 1-2 degrees LE right. That said, I love what is has done for the handling of the plane. iMs, Zip -----Original Message----- From: "svd via KRnet" <krnet@list.krnet.org> Sent: Monday, May 28, 2018 5:52pm To: "krnet@list.krnet.org" <krnet@list.krnet.org> Cc: "svd" <osprey...@yahoo.com> Subject: KR> Ventral fin on Goliath Dear inhisserv...@reagan.com <mailto:inhisserv...@reagan.com>,
I couldn’t review old emails from the archives - so I thought I just ask. How does the ventral fin on Goliath work? Did you add it for directional stability or spin recovery? Cheers, Owen _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
