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I have both a cordless and corded angle grinders. Running 40 grit flap disks. . Progress so far . . . . . I've been using the cordless, since the corded goes too fast. I was getting a lot of static electricity as I was grinding, which I was not too keen about. I kept a mist spray bottle...

I'll probably run my changes by the N.A. to see if there are any concerns. He was pretty good with the design and safety factors that I had applied.

Transom support structure is roughed out. . . Now onto the final grinding . . . Oh joy . . . :p . . My cordless angle grinder is being put to the test.

Here is the difference in those 2 boats (Formula 310 I/O vs OB) The outboard version has the hull extended at the full height of the transom and distributes the load to the outer areas of the hull. (actually a clever design) . . . . The I/O version does not have the hull extended and is...

Good question and I am glad you asked . . . I can answer that with a series of drawings that track the forces created by the engines, through the extension bracket, and on to the transom and the stringers within the hull. #1) The forces of the engines (note that the force placed on the transom...

A day of cutting and grinding . . . . I got a lot of the transom reinforcement structure cut . . . still a few more pieces to go. . . . . I hope to be glassing this in over the next couple of days.

No I used the red & black measuring tape on both . . . Just a smidge off.

I am cutting the Coosa board for the additional stringers and transom supports. I have another unit of measure for @redneck joe . . . These 2 pieces are supposed to be the same dimension, but the one up top is off by a 'smidge' . . . :unsure: .

Because the place only had the #400 . . . I can play temperature games to extend the open time.

I picked up the Hull & Deck Putty this AM . . . It is poly-based, but hopefully will be OK, considering I'll be scarf joining the extension bracket to the hull as well as my 50 +/- bolts. . My plan will be to start the putty cold (60˚F ish) to slow it down, then add heat to the E-B once it is...

The words for the day are 'pressure washer' . . . :ROFLMAO: that will do the trick. I think I there may be a new pressure washer in my future, because the reigning machine had a throttle/governor mishap. Anyway, I've been trying to get this 'bonding plate' off the transom for the past few...

More engineering on-the-fly . . . design change #6,157 :ROFLMAO: . Given that the underside of the swim deck has as much fiberglass in it as the transom, I have changed the transom reinforcement, eliminating the struts that were to extend in the swim deck cavity, and moving the top...

I have offers for help. :D

I cleaned-up some of the wiring in the (former) engine bay in preparation for some grinding and glassing. . . I put a few 1/2" spacers on the extension bracket and tried another fit. . . I got my laser line thingy, so I checked the alignment with the keel. . . Looks OK . . . better than I...

Quick update . . . Maybe not so quick I spent much of yesterday trying to get the extension bracket aligned, since it seems to be off once re-attaching it. I think the rear portion of the boat (swim deck) is symmetrical, but maybe not, because my centering measurements are off by about 3/4"...

I did some more grinding. The fit is better. . . . . Of course, every time I loosen up the extension bracket and re-seat it, squareness seems to go out. Yesterday it was pretty good . . . today, not so much. Laser line tool is on order.

The extension bracket is fitting better. I think a 1/2" spacer will do the trick. . Here is the starboard side . . The port side seems to be the issue, as it flairs out about 1/4" at the bottom. The spacer and maybe a little bit more grinding here and there should do the trick. Using deck...

Checking the measurements on the transom face vs. the extension bracket. . . The width of the top is fine (actually 1/2" to spare) The lower portion looks to have flared out a wee bit . . . probably during the framing of the outside stringers. I did some grinding (not a lot) and will see how...

I can also get a 5 gallon pail of 'hull & deck putty' for $315 . . . I'll have to verify if it is VE or Poly. (prefer VE)

I am leaning this way . . . I think the stuff is often called structural putty or deck putty. Basically, PB with a fiber content IIRC. I think I can get VE structural putty . . . . . Or perhaps make my own. I can get VE resin for $49/gallon and I have lots of fiberglass material to chop up.