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New boater here, but not new to RC. I have a Desperado Jr catamaran running all stock. When I'm at full power, the only thing touching the water is the transom and maybe 1/5 of the hull in front of it. The whole boat is angled maybe 10 degrees nose up. And if I hit a fairly small wave that isn't square, it will flip the boat over. Should I move the battery forward to keep the nose down? Could the angle of the prop be off (it's not adjustable but anything can be shimmed)? Is there anything else I should do?
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try setting cg at 30 % of the length from back of rear sponson to front of boat. strut should be fairly neutral to start with. -
Yes first move the battery forward till have the boat balanced .If this not worked so you can think to make changes with the prop.GillGO FAST AND TURN RIGHT !
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I'm new to a lot of the terms that boaters use. Is the strut the axle that the prop rides on? It is set from the factory to push the rear down without any means of adjustment. I can rig up a change if I need to, but I'll try the CG change first.Comment
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Think of an adjustable strut as a teeter totter. When you raise the strut it angles the prop upward. This pushes the back of the boat down which raises the nose, and exactly the opposite when you lower the strut. As its been suggested, add weight to the nose of th ed boat to alter the cog....Comment
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I checked the CG this morning, and it's pretty much dead on at 30%. I took a picture of the prop area so maybe you guys can tell me what to do next. Nothing is adjustable on this boat, so I'll be going into warranty voiding land to fix it. I'm ok with that, but I'd like to have at least a chance of getting it right the first time. The pic is as level as I could get it to the bottom of the sponsons. I see that it points up just a bit in order to lift the nose, and it's down in the water past the center line of the strut.
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If I were to do anything I would re drill the strut mounting holes higher and shim it so the prop is more neutral. Probably need to re shape the stuffing tube for your shaft."Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
--Albert EinsteinComment
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I just love it when companies mass produce set ups that don't work right ."Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
--Albert EinsteinComment
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To be fair, when the lake was fairly calm it ran fine. But in an 8-10 mph wind it was pretty wild if I ever let it get up on plane. It actually once did a complete roll on top of the water and kept going. It would be pretty cool if I could do that on demand, but I was something short of being in control!
So I would need to tweak the aluminum tube (that's the stuffing tube I guess?) at the bottom of the boat to be close to 90 degrees to the sponsons and then raise the prop a bit? Is raising the prop done to help get the angle right, or is the prop actually sitting too low to run properly? I have done some searching for a beginners' setup guide for these boats, but all I'm found is bits and pieces of information. If this were a pattern airplane or 3D helicopter I could have it running beautifully in a day. But I'm such a newbie with boats I don't even know where to start.
About your dark side comment rearwheelin, is that a dig at Thunder Tiger or just at the inexpensive RTF boat market in general? We have the same thing in airplanes, causing untold headaches among trainers who have to deal with poorly designed and built cheap planes from China.Comment
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I did some Youtube searching, and found this. My boat looks pretty much just like this one does in the water. It sits a little tail down at rest, then the back goes down under power and stays there until you let off just like this one does. Is this how a catamaran is supposed to run? Or is this a bad setup that can be corrected with the mods you described?
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jester it appears that the prop is angled up and that will keep the nose up in the air....the faster you go the more air will get under the boat and flip it over.....can the batteries be moved up forward some? maybe a new adjustable strut would help...but that's a rebuild u may not want to get into.... how about some over all pics of the boat and inside and the lenth etc....
what part of tx are u located as someone may be able to help from the numerious clubs around the state
MY RETIREMENT PLAN?????.....POWERBALL
74 vintage kirby clasic hydro, pursuit mono, mg, 47'' mono, popeye hydro...
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To me the prop is way to low in the water and is the reason it twists out of the water causing it to roll over. The stab at the rtr was just that, not your thunder tiger directly but in general. Rtr boats are pretty good and probably the best point to start out at in the hobby. It's too bad there is stuff that is this far out of what's considered an acceptable setup. There are much better rtr boats than this thunder tiger but will cost you much more I would imagine. You are way ahead of the game because of your other experiences , it's to bad when thing need to be modded so much like this one. I happen to like some of the TT rtr models other than there boats ."Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
--Albert EinsteinComment
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Hey, I just want to know, is the strut aluminum or somekind of cool composite material? I always wondered about that!
I have the same problem with my MG, the stuffing tube was angled and so it messes up any up and down movement of the strut. It was hell to correct the radius of the tube while tring not to damage the whole set up. If you proceed to re bend it gently, make sure one of your hands is very close to the entry of the tube on the bottom floor, you need to make sure that section doesn't move. I had to do a two step bend, in order to have a 90* to the transom or parallel to the floor---however you look at this. I need to press it down ( further on the direction of being 'POSITIVE " thrust) , then bend it back to where I wanted, this was to reshape the curve. The MG tube is longer and might be easier, hopefully you only need to do it in one step.
Good luck!Too many boats, not enough time...
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I am a little confused with the wording....
When the strut is in neutral, it it in angle cero. So rising the strut is a posite or negative angle? My understanding is that rising the strut is a positive angle, compare with axis x (paralel to the flor).
Am I right?
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