Guidelines for placement of yarn strips on wing for airflow/stall study ?

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Gregory Perkins, Aug 22, 2019.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Aug 22, 2019 #1

    Gregory Perkins

    Gregory Perkins

    Gregory Perkins

    Active Member

    Joined:
    May 25, 2019
    Messages:
    32
    Likes Received:
    11
    I am helping a buddy with a newly built low wing Rans RV9 that stalls about 70 mph.

    I want to tape some yarn strips on top of the wing so that we can observe stall progression and
    development as well as Best L/D AOA flying etc. I was going to tape them all in a straight line but then considered that several previous yarns pieces could affect the airflow to the following yarn placements.

    I normally opt for AOA vane indicators for this kind of study but buddy doesnt want to stick anything else to the wings.

    Any tips or pointers or instructions for yarn placement would be appreciated
     
  2. Aug 22, 2019 #2

    Richard Schubert

    Richard Schubert

    Richard Schubert

    Well-Known Member

    Joined:
    Feb 5, 2009
    Messages:
    150
    Likes Received:
    41
    Location:
    Pittsburgh, PA
    On Peter Garrisons Melmoth 2 site, there are images of tuft placement. Looks like he just stuck them in the areas of interest. Check the March 17, 2009 entry.

    http://www.melmoth2.com/texts/Progress.htm

    Also, this is pretty cool;

     
    Last edited: Aug 22, 2019

Share This Page

arrow_white