On Saturday, October 12, 2019 at 4:57:48 PM UTC-6, Eric Greenwell wrote:
Armand Charbonneau wrote on 10/12/2019 8:42 AM:
My Ventus 2c makes a howling sound when flying at 0 flap setting. It is significantly less noticeable immediately after changing the flap setting either positive or negative. Pilots tell me they can hear it when flying overhead or landing. I can hear it seemingly behind me, inside the cockpit.. Gear up or down does not seem to make a difference.

The glider was refinished with poly in 2012, so I suspect the wing seals are seven years old. Otherwise the ship in very good condition and soars nicely.

Does anyone know what could be causing this sound? I can replace all the seals this winter, but they appear to be in good condition, except maybe on the tail plane.

Did the howl start recently? Are the zig zag tapes in the correct position? Does
the back edge of the Mylar fairing strip (top and bottom) press against the
flap/ailerons in the Flap 0 position?


--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

Howling has been there since I started flying about 105 hours ago. zig zag tapes look okay.

I will check the mylar strips (top and bottom) carefully with the wings assembled looking at flap 0.