Location: Cocoa Beach, Florida I'm bogged down in the Real World so have not been able to work much on the model-that should change before long.
A while back, I designed and built unique production RC sailboats-which I designed and built the tooling for. I played around with the numbers on this one so that I'd get a model that would give good results in testing while allowing me a weight budget that I hope I can live with while having an excellent finish by the time I'm ready for RC testing. 2) Because of some technical issues that have to be resolved with the MPX system and the extension that is required of the daggerboard- trunk leg room is further impacted and so is weight more so that I had originally allowed for.
3) Same potential issue with the mast step-the raised freeboard could require an extension that would be heavy and a real drag to do.
Conclusion: I am not going to go with the Trapwing hull shape which will simplify both the model and full size modifications. Pictures: L to R-the Trapwing hull was based on the hull in the bottom picture with the modification of higher freeboard and more length and was going to also serve as the SRT. Location: Mount Pleasant, SC I'm just teasing I really want to see physical progress! Because of the expense of this model and because it is based on an existing full size hull that I want to use to test multiple ideas I've decided to do the same thing with this model which will be an excellent test platform even if the self-righting concept doesn't work. 3) test the MPX foil system( main hull foils that control pitch and automatically control sailing angle. Pictures: L to R- 1) bow sections right side up, 2) stern sections, right side up, 3) bow sections upside down and bow piece right side up, 4) stern sections upside down.
I went thru a process in picking the model size based on the fact that displacement(weight) scales as the cube of length, sail area as the square of length. What may not be evident to most people-and a critical factor in testing-is that righting moment varies as the 4th power of length. Anyone that has ever fooled with models before probably already knows that you can't sail a model in the same wind pressure as the full size boat with max sail area.


The foils on the full size and model SRT allow the main hull to take off in very light air-around 5-6 mph reducing drag tremendously.
Piece of cake-and a whole lotta fun-especially if the self-righting aspect of the concept works. Location: Toronto Nice work, are you using balsa for all wood in your model ? Originally Posted by AsterixDeGaul Nice work, are you using balsa for all wood in your model ?
I'm damn good at building and finishing plugs to a high standard so that an extremely high quality mold can be built. In addition, the main foils of the Rave continue to load up as the wind increases while the mainfoil of the MPX concept unloads the faster it goes(with standard crew and ballast) The model will takeoff in about the same wind as the F3(5mph). It is unstable like this(theoretically) and will likely roll to one side accelerating automatic righting process.
Because of the hull shape it is convenient to build the model right side up and then remove it from the station extensions. The intention was to modify that hull to raise the freeboard and change the bow by extending the length 2'. I've seen the pictures a hundred times, like most folks I want to see something new, forward movement, concrete progress. The boat will be made radio control-I used to build rc boats for a living so this thing will be done in a very professional manner and will be built from the get go to facilitate multiple tests. I picked a size that would allow enough weight(displacement) for the model to be effectively radio controlled and as large as I could practically(?) deal with.
That means the model will have to reduce sail much sooner than the full size boat with them both sailing in the same wind. To put that in context ,the maximum righting moment of an F18 catamaran without depowering or reefing is reached in a windpressure of 1.8lb.


As the boat accelerates and approaches the max wind pressure above, the main foils unload, allowing drag to be reduced even further virtually eliminating induced drag resulting from lift (on the main foils) with the ama foil now fully loaded(within its drag bucket at a CL of around .6 or less).
But this is different-and I'm not good at building one offs-or should I say they have been a real pain in the past to finish cosmetically to a level I'm satisfied with while at the same time maintaining a one-off weight budget. On the MPX concept the ama foil will eventually support the max weight of the boat with main and rudder foils mostly unloaded. What I ignored in this plan was the attachment of the cross arms and how that would affect sitting in the cockpit. I imagine many are familiar with those rules of scaling-you can see the dimensions in the post above for the model and full size. The boats will both need to be depowered when their respective max windpressure is reached and the indicator will be speed-- determined thru testing.
On the model and full size another indicator will be noticing that the flap on the main foil is staying above its zero deflection mark.
The main foil uses an altitude control system similar to that used on a Rave and that will allow the foil to pull down increasing RM. That will be advantageous with a light crew but it will have to be monitored because of the huge force it is capable of generating. The mast weight based on the Fiberform Tornado section multiplied by 1.27 to account for greater RM of the 18 tri and then scaled accordingly.



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