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View Full Version : A Dave Gentry "Mobjak" SOF Kayak



skaraborgcraft
04-20-2016, 05:52 AM
Dave asked me to post some photos when it got launched, and with the ice finally gone on the pond, i got to splashing it this morning. A few construction pics too.

https://lh3.googleusercontent.com/-rY-2KKybwbA/VxdcBpZh1iI/AAAAAAAACnw/jPC5sSIo2947b5-XNassZ_9CuEIKq92LQCCo/s640-Ic42/PICT4655.JPG

I used marine Okume, and reckon i could get another 3 maybe 4 sets of frames from the same sheet, thats good value.

https://lh3.googleusercontent.com/-_6oaUogtbjo/VxdcEFdZEQI/AAAAAAAACnw/uZt9nohnhbomvCy2nCAbgsFjzAXB7cKiwCCo/s640-Ic42/PICT4657.JPG

I used spruce for the stringers/keel and chines. It all went on without swearing....

https://lh3.googleusercontent.com/-byaaq7eMoOg/VxdcGsHFUJI/AAAAAAAACn8/CS77pAHmwuEbbtIxmj8eYWP4IMblNrk1QCCo/s640-Ic42/PICT4662.JPG

I used spectra braid fishing line as lashings, a bit aggressive on the fingers, taping up the fingers is a good idea. More to follow.....

skaraborgcraft
04-20-2016, 06:03 AM
https://lh3.googleusercontent.com/-Dr8cW1nFUKY/VxdcLjJkVKI/AAAAAAAACn8/v4s99_QrbUgmabOQgxDDGCuu9XrCg-r1gCCo/s640-Ic42/PICT4669.JPG

The framework had a liberal dosing with tung oil, first few coats thinned out, then neat.

https://lh3.googleusercontent.com/-85U7e9ozFhw/VxdcTl1BZ_I/AAAAAAAACn8/8Xb4umZric4SadrMz-q0izaY76WFkzWggCCo/s512-Ic42/PICT4672.JPG

https://lh3.googleusercontent.com/-fMh6TfuuhUY/VxdcgaNMGpI/AAAAAAAACoE/TBmOJeWd0I0L5Vjp82uycvgU7jPrBkX4QCCo/s640-Ic42/PICT4709.JPG

I did the skinning in one day. I used ballistic nylon, damped down with a hand sprayer and used canvas grips to pull it tight. I discovered very quickly that my writs and fingers could not keep tension and sew at the same time, so i ended up using staples in the gunwhale to get the bottom tight, stitched the bow deck together, and then removed the staples, which did not leave a clean surface as i would have hoped, but this was all an experience to see what worked and how i may do things differently next time. I was very surprised to get it "drum tight" with a good ironing, and no creases anywhere.
After that dried, i coated it with 4 coats of monourethane paint, and will see how that holds up. I fitted an aft deck line to take the paddle in a brace position, but nothing else.

skaraborgcraft
04-20-2016, 06:18 AM
https://lh3.googleusercontent.com/-me49y-z8a1M/VxdcyJuW9oI/AAAAAAAACoI/kkHf960Rk7QcUbN1fKD0XVI5Xz_MluE2gCCo/s640-Ic42/PICT4766.JPG

I had a WOOOOA WOOOA moment getting in until i was seated and thought it was too tippy for me. Im not sure if it was muscle memory or what, but after relaxing and just floating away from the bank, i settled in nicely.

https://lh3.googleusercontent.com/-wleHETi9DII/VxdczsnNC0I/AAAAAAAACoI/yO0rL09stigdGn9SSVyHEpTTydW_pgFNQCCo/s640-Ic42/PICT4768.JPG

Its not a large pond, so it didnt take too long to get around it. I didnt want to launch on the big lake without testing myself first, let alone the kayak for leaks or issues. First impressions was she just goes. My paddle is quite light, and i found just going through the motion of dipping it was creating progress without any undue effort. For someone with elbow and wrist issues this is nirvana, at least in calm conditions, which is the only conditions i want to be out in. The deck keeps all the water from the paddle out of your lap, but i did get wet feet. I had some holes alongside the deck seam, and paddle water was dripping through (is sikaflex a good idea here?) . So, apart from having to get used to paddling again and the stabilty, im delighted. I was going to build a PBK10, but after seeing the Mobjack, i kind of fell for its looks. So thank you Dave for a great design.

https://lh3.googleusercontent.com/-_Yii3YQH8Go/VxddCIWhzaI/AAAAAAAACoI/Q6ZKeIrpeGwLQBQr0V8eD-ekPPLJ78gtgCCo/s640-Ic42/PICT4771.JPG

Hwyl
04-20-2016, 06:40 AM
Congratulations.

Hreoaj
04-20-2016, 01:57 PM
Looks great. Did you seal with monourethane inside the coaming as well? It looks like dry nylon to my eyes on this here phone.

skaraborgcraft
04-20-2016, 03:36 PM
Looks great. Did you seal with monourethane inside the coaming as well? It looks like dry nylon to my eyes on this here phone.

Nothing wrong with your eyes or your phone, the nylon that is inside of the coaming is unpainted. I might add i didnt put any foam bouyancy in, but did fit air bags fore n aft that do not interfere with my feet.

Hreoaj
04-20-2016, 05:30 PM
Nice. She has nice lines and looks roomy for a greenland style boat.

DGentry
04-24-2016, 07:24 AM
Looks great - congrats! I hope you have lots of fun in her. Sikaflex - or just about anything "goopy" will work fine for sealing the stitching holes in the deck. Including just daubing some of your nearly dried monourethane skin coating onto them. Let me know how you like that coating after a while, too, please!


Hreoaj: Nice. She has nice lines and looks roomy for a greenland style boat.
Thanks! The Mobjack Bay was actually designed to be more comfortable and more relaxed to use than most Greenland style boats. I'm pretty pleased with how that turned out, and by the great job her various builders have done.

Dave

Canoez
04-24-2016, 10:09 AM
Looks great - congrats! I hope you have lots of fun in her. Sikaflex - or just about anything "goopy" will work fine for sealing the stitching holes in the deck. Including just daubing some of your nearly dried monourethane skin coating onto them. Let me know how you like that coating after a while, too, please!


Thanks! The Mobjack Bay was actually designed to be more comfortable and more relaxed to use than most Greenland style boats. I'm pretty pleased with how that turned out, and by the great job her various builders have done.

Dave

As Dave knows, one of my students is building a Mobjack Bay with the larger cockpit coaming option. What was amazing to me was that it was wider than the modified Sea Tour 15R being built by another student. Certainly lower volume, but wider.

skaraborgcraft
04-24-2016, 11:30 AM
Looks great - congrats! I hope you have lots of fun in her. Sikaflex - or just about anything "goopy" will work fine for sealing the stitching holes in the deck. Including just daubing some of your nearly dried monourethane skin coating onto them. Let me know how you like that coating after a while, too, please!


Thanks! The Mobjack Bay was actually designed to be more comfortable and more relaxed to use than most Greenland style boats. I'm pretty pleased with how that turned out, and by the great job her various builders have done.

Dave

I was in a bit of a rush when i put the kayak away in the roof, and she had settled down at the aft end, on the end of a bit of wood that has deformed the skin by quite a bit, happy to say the paint has no broken away or cracked, so i am impressed so far, but will keep you updated if i see any signs of trouble.

WaveyDavey
05-01-2016, 12:13 PM
I am beginning to build a Disko Dreadnought, going to use poly for skin. I am curious as to what you used to coat your boat.

DB