Project F10

Got it

 

I hope Doug or Ian takes a look at this

 

Because how many different foils and foil control systems can be used, I hope that one day the F10 will be an officially-sanctioned AMYA class. One-design hulls, strict wingsail development rules, and open development for foils and ride height systemes. I have a friend building another F10 so we can have a sparring partner to test new designs with.

 

WK, is the F10 limited to catamarans? I suggest you e-mail Magnus Clarke, he is a friend and an expert on foils and wing sails having participated in the C Class and helped with Larry's giant ORACLE AC trimaran. He's also experienced with models.
I think it's hard to beat a wand based altitude control system except if you can do a tri where the amas would use UptiP foils pioneered by TNZ in 34. They feature "solid state" altitude control requiring no mechanics or electronics at all. I think a well designed tri will beat a cat hands down.....Surface piercing foils(favored by Ian and others) don't require an altitude control system either and can be very fast since their area is reduced the faster they go. Not sure how well they'll work for very light air takeoff.
IF you want to build a very light model I suggest you first build tooling for the hulls-it is almost impossible to keep the weight exceptionally light doing a one off. Good Luck!
PS--WK-sent you Magnus's e-mail by PM.......
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Here are some shots of my F3, the worlds first production RC sailing foiler. She did 18mph with me and over 20 with a customer and would foil well upwind and tack/gybe on foils (with practice). She would also take off in a 5 mph wind:

 

Why are most RC foiling multihulls tris? Just asking.

 

You tend to be looking for righting moment on RC multihulls and trimarans can be square or oversquare platforms whilst still retaining good sailing characteristics. The main hull helps them tack which is no small problem with a really lightweight RC multihull, trimarans with their main hull to pivot on tend to do that better. Just as a reference on a 2m RC multihull with a carbon build we are aiming at about 4-5kg max complete boat weight so they don't weigh much. It probably doesn't matter quite as much if you are having a tight rule that restricts platform sizes etc but trimarans tend to win out when beam is allowed to be square. It's not about speed necessarily but power which can be the same thing as speed.

 

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Tris tend to be faster especially on foils when the rules don't get in the way. My F3 was 72" wide and 56" long to maximize the effectiveness of the foils. I was asked why I didn't design to the mini40 rule: simple, it constricts the design potential way too much limiting overall beam to 48" so you couldn't effectively utilize the F3 configuration. The utilization of foils to provide all the righting moment is a real advantage at model size.......