Thread: Discussion Miss Bardhl U-40 1967
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Old Feb 06, 2013, 03:02 PM
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The motor location could work out fine, but it might be that the batteries are installed more toward the transom. I was thinking that the angle on the drive shaft was angled down a bit more than might be necessary, and maybe a bit deeper than desired.

You might check that the rear flat bottomed section of the hull is basically level to a table when the boat is sitting on the end of the strut ( with no prop) and the back (ride surfaces) of the sponsons. That might be a good starting point for the depth of the strut.

The CG does need to be behind the back of the sponson, and I would guess between 1 and 3 inches. Since the batteries are the main movable weight it is a good idea to plan for a range of motion for battery location that you can use to tweak the CG in that range.

For my skid fin, I just cut some an aluminum plate, about 3" long and 2" deep with a bit of a taper on the leading edge and then screwed that into the inside edge of the sponson. It sticks down about an inch below the ride surface. Since my 1/10th scale runs counter-clockwise, it is on the left sponson. I checked but it does not look like I ever took a picture of it when building the Hallmark Homes, but I do have a picture of the real boat where you can just make out the fin. The boats hardly had any fin at all, but even if you are not racing I think you want a little something there.
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