Originally Posted by
CraigP
ProperChopper and I started chatting about this hull. Here's what I had on the other thread:
What prop did you end up with? I'm putting an 8S, Leonard 40X72 1050kV to start, then I have a 1250 40X82 motor to kick it a little harder. It's been a while for me, but I'm really looking forward to going electric, gas powered boats were a PITA! I was wondering if you could share what prop you are currently working with. I have Grim Race 38X55, 2 blade High Lift to start out with. I have a Grim Racer 40X57, 3-blade high rake prop to step it up. Is a 42X63 prop about it for this hull?
I'll get some picks on the sponson mods I'm going to be doing. The room in this hull is awesome, love that! I plan on putting the length of the four 5200, 2s batteries across sideways, just starting at the top of the hatch. They go out across the drop off for the sponsons. Thinking of mounting a floorboard for the batteries in there. I want the CG weight components split out, getting weight well forward and placing the front of the motor 13-7/8" from the back of the transom. That still leaves ample room for the ESC and Cap Board in between the motor and the battery pack. I think about CG like a teeter-totter. The longer the arms are from the fulcrum, the slower they move. When the arms get short, then the speed of the teeter-totter goes up dramatically, which represents the boat porpoising, which is not the play. I'm setting my rudder to the left like your model. That seems to make the most sense for a right turning boat running a CCW prop. Prop torque will try to pick up the left side, so setting the rudder left helps stake that side down.
Another trick I was going to employ was to shim the left side sponson up about 1/8" from the right. This really helped in GP boats for turning. My brother is still running in GPW, has a 28', 500CI blown on alcohol motor. (Check out YouTube, search for GP55) I know the dynamics don't entirely scale, but weight shift and corner planting should involve the same physics.
Sorry to load you up this way, I just loved the way your hull turned out and value your building skills and experience tremendously. One more point to ask you, strut angle. I'm looking at 17 degrees, going into a single 10" radius bend to the strut. There is something I want to try... I found that the stainless steel tubing on OSE was a perfect fit for the 0.187" flex cable without a liner. It has about 0.004 - 0.005" per side clearance, perfect for grease. The stainless has a thicker wall than the copper tubing normally used. Also, I find the "stickiness" of stainless to be far less that copper, something that is termed "stiction", so I believe it will not have a tendency to grab the cable. You think it's worth the try?
Well, ProperChopper, getting long here. I hope that we can meet up some time, I have enjoyed getting to know you some on the forum. I promise to get pics out on the build. You know I just hate stopping work to take pictures, but they can be very valuable and may help others enjoy this great sport!
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