RE: M_Boats: M15 storm jib

I sent the following question to Kern, as he sewed my storm jib, but does anyone have an opinion on this: "I pulled the storm jib out you made me and was wondering if it ought to have a tack pennant of some specific length in the setup? What's your recommendation? T"   Tom Smith and Jane Van Winkle M15--345  Chukar M17--064  Unnamed