Recently bought a used Mach 2, and with no local moth sailors in my 'hood am relying on some of you experts for input. I've watched all the Outteridge tutorial videos, and read the awesome articles by Dan Neri (he also followed up when I emailed him the below, with some great advice-- much respect here)
The short version of my dilemma -- I can pop up on the foils quickly without drama- until the foil pierces the surface and I crash. The boat just wants to keep climbing (vertically).
dial out some lift, right ?
Cant quite understand how to get enough flap ‘range’ on the main horizontal.
- ride height barrel has a range of 40mm of thread, full-open (long) to fully closed (short)
- large ‘early-rise’ foil has a flap range of 0-28mm (moving bell crank fore-aft with my hands, nothing connected)
- I’m beginning per Dan Neri's article from mid-height with the gearing, in the middle of the bell-crank stalk
- wand position doesn’t seem to have very much influence on main foil flap angle
- range of influence seems to be around only 4mm from wand vertical to wand aft (low-ride/ launch mode), regardless of barrel position or gear height
- it seems to me that we’d want the main horizontal to be ‘flaps down’ (28mm?) to generate max lift for take-off, then as the wand drops to a vertical position, would relax itself (via the shock cord assist) forward until the main foil gap goes to the suggested 7mm as an all-purpose cruising / starting point. this amount of range seems unattainable based on my various input combinations of barrel length, gearing, shock cord tension etc
Gearing: Barrel threads Main Horizontal Flap GAP
wand vertical ——> wand aft
low on bell crank:
barrel open 40mm threads showing. flap range= 24-28mm
barrel in middle 20mm threads showing. flap range = 11-18mm
barrel is closed 0mm threads showing. flap range = 2-7mm
middle of bell crank
open 40mm 25-28mm
middle 20mm 17-21mm
closed 0mm 7-12mm
high on bell crank
open 40mm 23-27mm
middle 20mm 17-21mm
closed 0mm 9-12mm
Gearing has little influence on flap position. Existing controls cannot provide for both a flap-down and also cruising orientation of main foil flap without significant manipulation.
I’ve been able to sail the boat ‘low’ and have no struggle getting the boat to lift off and go all the way up. However, this is when the main horizontal flap is all the way in down / hi-lift mode and the boat keeps rising until the foil breaks the surface. And I crash. The flap on the main horizontal will not retreat to a neutral-camber position, it stays in hi-lift mode. Unless I adjust it to neutral, then it doesn’t create lift for take-off. I have not tried to sail it with no camber.
If I put the foil @ the suggested 7mm ‘open’ position (with wand vertical, barrel mostly closed, gearing in mid-height on bell-crank) and then re-look at the main horizontal flap angle with the wand in launch position, I would only be at 12mm gap for take-off. Is that enough ? If so, whey would it be designed to have a 28mm range ?
I”m guessing this is not enough camber to generate the lift I need to get my sorry ass up in the air, as it only provides 5mm more foil flap lift than the indicated / suggested 7mm ‘cruising altitude’ per Dan Neri’s well written article.
Hoping Phil S and other mothies will chime in here. Dan Neri's info yesterday was helpful for sure, I'm just trying to glean as much info as I can to be efficient with my practice time / mitigate the swim meet
No, there aren't any local moths to sail with where I am currently..