LeeD said..
I wonder....
Is the 914 better tuned with the chopped 280?
Is the 280 slightly too small for the 1150?
The 1150 with 310 seems to have great range.
The 1150 with 210 seems squirrelly.
The 600 with 310 seems comfy.
The 600 with 210 seems very helter skelter.
For racing purposes, I doubt that large rear stabs will be used in the future. I'm curious how much foil pitch stability will improve as air-wing designs progress towards lower drag and more efficient gust dynamics, allowing for smaller, lower drag stabs and avoiding long fuselages.
I have never used the Naish HA914 with the stock HA280 rear. The chopped HA280 rear certainly feels loose in yaw when I don't have much mast in the water. I've often had the mast foil ventilate but it usually recovers. The Naish C100 mast ventilates a lot less (and re-grabs easier) with an 800 grit sanded finish versus the stock gloss surface. Just once, I used the HA220 rear foil with the 914, which obviously felt faster and much less stable in roll and pitch. It was difficult for me to control in gusty conditions.
I have used the 1150 about 6 times with the HA280 (clipped clips) rear (1 deg shim) and once with the HA220 (ended up with a 2 deg shim so I could control it). The 220 at 2 deg feels a lot faster than the 280 at 1 deg, but the 220 is too unstable for my current skill level with the 1150 in fast conditions.
The HA914 feels so versatile, that I'm now keen on further modifying my 1150 to make it into a dedicated high-speed foil. I think it'll be quick and easy to clip the tips a little more (and fill any exposed soft core), then sand out as much of the rear concave in the bottom as possible to make the foil more symmetric in section, shorter in chord length, and lower in surface area (I guess under 1000cm2).
