MI Malahini questions

Designs for inboard or outboard power

Moderator: BruceDow

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

MI Malahini questions

Postby footer » Thu Feb 08, 2018 3:49 pm

OK, there is a lot of stress about how straight and flat the bottom has to be. So now im a bit concerned.
When the batten next to the keel is drawn down on the 4th frame, it bows up slightly between the 3rd and 2nd frame. Is this a problem? How do I correct it? Did I do something wrong?

User avatar
vupilot
Posts: 3333
Joined: Wed Apr 15, 2009 7:36 am
Location: Indy
Contact:

Re: MI Malahini questions

Postby vupilot » Thu Feb 08, 2018 4:47 pm

Should work out when you put the bottom planking on. If its stiff enough it wont lay down with the planking in place I would just fair it before installing the bottom planking.

Hercdrvr
Posts: 533
Joined: Mon May 11, 2015 12:52 pm
Location: McKinney TX

Re: MI Malahini questions

Postby Hercdrvr » Thu Feb 08, 2018 5:08 pm

Shoot us a picture. Is the batten laying flat and relaxed on the frames or are you pulling it down forward of frame 4 in preparation for the bottom planking? If you’re torquing it down it might cause it to bow up aft like the keel does aft of the stem. In the picture I’m torquing down the batten with a long clamp.
Either way, like Chris said, the fairing process should fix it.
Matt B
Attachments
6D741BA1-CA0C-4186-8688-4C2569989FEE.jpeg

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Fri Feb 09, 2018 4:17 am

Thanks for the info. Kind of what I thought. It's perfectly straight until I drew it down to frame four. Then it bowed up just a bit between frame 2 and 3. I was just afraid if I faired it, it would make the Batten thinner and weaker and maybe it would bow up more. Or if I tried to force it down with the ply, I would end up with a bulge in the bottom.
So, I will give fairing it a try.
Thanks again guys.
Tom

PeterG
Posts: 488
Joined: Mon Dec 03, 2007 7:08 am
Location: Connecticut

Re: MI Malahini questions

Postby PeterG » Fri Feb 09, 2018 6:55 am

Not a problem, I would expect that batten to bow between frames 2 and 3 when you pull it down to 4, because frame 3 is a fixed point and the batten is bending there. The bottom plywood is relatively stiff and will push the battens back a bit between frames, this is ok too. When you are fairing the frames and battens, be sure to use a strip of 3/8 plywood as a batten across the hull to check your progress. Realistically there should not be much material removed from the battens, most fairing involves the rest of the structure: frames and transom edges, stem, keel, chines and sheers.
Good luck, post pictures and most of all have fun!
Murphy's Law: Anything that can go wrong, will go wrong.
Griffin's Law: Murphy was an optimist.

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Tue Jun 12, 2018 4:11 am

Start the build Of my Malahini in Michigan on January 15, 2018. Fortunately, I keep my garage heated during the winter to 55 degrees.
Attachments
IMG_2754[1].JPG
Malahini. Construction frame built and starting to square up the frames and stem.
IMG_2743[1].JPG
Malahini. Laying out the frames.
IMG_2725[1].JPG
Malahini. Not exactly sure what kind of mahogany I bought, but these are beautiful 1"x8"x10' rough sawn boards that were cut straight on one side.
Last edited by footer on Wed Jun 13, 2018 6:49 am, edited 2 times in total.

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Wed Jun 13, 2018 3:08 am

February 2018
Attachments
IMG_3039[2].JPG
Malahini
IMG_3038[1].JPG
Malahini
IMG_3037[1].JPG
Malahini

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Wed Jun 13, 2018 3:12 am

March 2018
Attachments
IMG_3071[1].JPG
malahini. I pulled off the mahogany chines (laying on top) and put on white oak chines. This was a 1"x10"x18' rough sawn white oak board with no knots and almost perfectly straight grain. Much happier.
IMG_3063[1].JPG
Malahini. This Mahogany chine was on for 5 minutes when BAM! it suddenly snapped.
IMG_3062[1].JPG
Malahini. The starboard chine held good, but the port later snapped, so I replaced both with white oak. The sheers being smaller, bent quite well and laminated easily.
Last edited by footer on Wed Jun 13, 2018 6:53 am, edited 2 times in total.

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Wed Jun 13, 2018 3:20 am

March 2018
Attachments
IMG_3145[1].JPG
Malahini. I stained the ply for effect, but later realized I had so many blemishes it was never going to stain out even, so I decided in the end I would paint it.
IMG_3130[1].JPG
Malahini. The bow side panels went on almost as easy as the aft bottom sheets.
IMG_3082[1].JPG
Malahini. All my battens and oak chines in place and faired, mostly.
Last edited by footer on Wed Jun 13, 2018 6:56 am, edited 2 times in total.

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Wed Jun 13, 2018 3:29 am

April 2018
Attachments
IMG_3413[1].JPG
Malahini. Installing the port side bow panel.
IMG_3381[1].JPG
Malahini. Installing the aft bottom panels.
IMG_3188[1].JPG
Malahini. fitting the aft bottom panels.
Last edited by footer on Wed Jun 13, 2018 7:11 am, edited 1 time in total.

footer
Posts: 32
Joined: Wed Jan 24, 2018 6:28 am
Location: Plainwell MI

Re: MI Malahini questions

Postby footer » Wed Jun 13, 2018 3:32 am

May 2018
Attachments
IMG_3477[1].JPG
Malahini. Fairing the bottom with System Three Quickfair. It's like working with bondo only a little harder and you mix it in two parts. It's relatively easy to work with, but you don't want to put on excess.
IMG_3422[2].JPG
Malahini. Bending the bow ply went much better than I anticipated.
IMG_3419[1].JPG
Malahini. I still had a bit of problem matching in the notch mating the bottom to the side on the chine, but I got it.
Last edited by footer on Wed Jun 13, 2018 6:41 am, edited 1 time in total.

User avatar
hoodman
Posts: 1584
Joined: Thu Nov 10, 2011 8:48 am
Location: Lafayette, IN

Re: MI Malahini questions

Postby hoodman » Wed Jun 13, 2018 4:54 am

Dang! You've been busy! That looks great!

Hercdrvr
Posts: 533
Joined: Mon May 11, 2015 12:52 pm
Location: McKinney TX

Re: MI Malahini questions

Postby Hercdrvr » Wed Jun 13, 2018 4:57 am

Very nice work. Looks like you had the inevitable “snap” on one of your chine laminations. It’s just not a boat without some cursing.
Looking forward to your next progress report.
Matt B

PeterG
Posts: 488
Joined: Mon Dec 03, 2007 7:08 am
Location: Connecticut

Re: MI Malahini questions

Postby PeterG » Wed Jun 13, 2018 7:07 am

Looks great! And nice recovery with the snapped chine. My Malahini is still a big stack of parts, with more parts still being added. :D
Murphy's Law: Anything that can go wrong, will go wrong.
Griffin's Law: Murphy was an optimist.

User avatar
hoodman
Posts: 1584
Joined: Thu Nov 10, 2011 8:48 am
Location: Lafayette, IN

Re: MI Malahini questions

Postby hoodman » Wed Jun 13, 2018 11:22 am

Hercdrvr wrote:Very nice work. Looks like you had the inevitable “snap” on one of your chine laminations. It’s just not a boat without some cursing.
Looking forward to your next progress report.
Matt B


Gotta break a few eggs! I think it's more common than not to break a sheer or chine. You have to really inspect the grain. I know I chose poorly for one of my sheer laminations


Return to “Power Boats”

Who is online

Users browsing this forum: TomB and 16 guests