DIY square top oars - Page 8 - Mountain Buzz
 



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Old 09-13-2018   #71
 
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Yep, I think those are good dimensions--very similar to Sawyer's Squaretops with the carbon wrap that are 1 9/16" at the outside of the wrap.
Mine are 1 1/2" x 1 5/8", but I don't have the carbon wrap. That neck dimension was the point I was (and am) most nervous about.

3/16" at the tips is thin...but with carbon over fir, you should be pretty strong. Rocks are really your only worry. Worst case, you could build it up after damage with additional glass, carbon, or dynel. You need impact resistance, not flexural strength.

We coved the other set of cedar-bladed oars tonight. They are stupid light. Balance point is a full 6.5" above the center of the oar!!!

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Old 09-14-2018   #72
 
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Weighed my old fir oars and new fir/jatoba oars. My bathroom scale isn't perfectly accurate. It told me they're all 8.6 lbs. I just can't believe that EVERYTHING is 8.6 lbs. Weighed 3 together and got 26.5...1/3 of which is 8.8lbs....but the fir/cedar oars can't possibly also be 8.6lbs.
So, I need to check again with a lower scale range.

Coved the cedar bladed oars. Deciding on blade shoulder and tip shape.
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Old 09-14-2018   #73
 
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You're a true craftsman, these are just incredible.

Sent from my SM-G965U using Mountain Buzz mobile app
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Old 09-15-2018   #74
 
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Quote:
Originally Posted by Paul7 View Post
You're a true craftsman, these are just incredible.

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Thank you sir. We're really having fun with these.

This oar project is getting me fired up for a dory build!
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Old 09-18-2018   #75
 
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New distraction....I am waiting to catch up my friends' oars to mine with final shaping and epoxy flow coat before we do the fiberglass tips.

...so now that the season is over, I'm remodeling my old oars again. Making them all square tops. I feel like Oprah. "You get a square top! You get a square top! Everyone gets a square top!"
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Old 09-18-2018   #76
 
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Yeah, I'm already working on 10 oars, let's play with 6 more!

Read up on 'cove cutting on the table saw'.



I cut coves on 3/4" x 1 3/4" wide strips so they fit over the 1 3/4" diameter of my old shafts.


Took a coarse rasp to the oars to knock off the old varnish/epoxy and give a good rough surface for the coved boards to bond do and glued/clamped them up. They will then get 3/8" x 2 1/2" caps glued on...after sanding the squares down, they should end up around 2 3/8" square. These strips are hemlock/fir. the flat strips will be cherry.
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Old 09-18-2018   #77
 
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Thats good work on converting those old oars to square tops!! I always love it when something old you made years ago can be brought back to life again with some creative thinking.


I'm 3 oars out of 4 on shaping and final sanding. I changed the shape and depth of my blades after my initial run. At first they had a cove cut...but as I will be laying the twill over the blade- I opted to re-saw them flat. So...I took them to the band saw.
After removing the excess wood from the cove cut, it made them noticeably lighter.
The entire blade is essentially 5/16" thick, and tapers as in flows into the neck.


I copied the cataract design on the grips with a convex cut for my thumb. I have a set of cataracts and really like that feature for blade orientation.
I used my band saw to cut the square width of the grip and did my final shaping with a combination of my grinder and belt sander.
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Old 09-19-2018   #78
 
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That's a really beautiful transition from handle to squaretop, stelz!

I think the only thing I'd do differently for yours would be to use spruce or cedar for a lightweight/low density core since you're doing wall to wall composite covering them.
...but with thin blades and a squaretop, I'm curious how the balance feels to you.


Even with the squaretops added to my old 9.5' oars, the old blades feel like logs (I planed down my blades on my 10' oars back in June)....I definitely need to carve out some serious weight. They average 3/4" thick...Doug Fir.
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Old 09-19-2018   #79
 
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Random, tangentially related question, since you brought up cedar...

I have four tall, straight cedar trees at the new place that will be coming down in the next few months. Good oar material? Get them sawed up into planks for other projects?

Btw, oars look sick and you should definitely build a dory. Like there was even a question.
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Old 09-19-2018   #80
 
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Originally Posted by BGillespie View Post
I have four tall, straight cedar trees at the new place that will be coming down in the next few months. Good oar material? Get them sawed up into planks for other projects?
Possible...but I think you'd have to go slightly thicker....and it really depends on the wood. If it's old growth, it might have enough summerwood/growth rings to be strong enough. I think you'd really want to reinforce it under the rope wraps with glass/carbon. I think the oarlocks would really crush cedar.

I haven't heard of many people using cedar for oars. Ash, spruce, and fir are the most prevalent, even among saltwater/flatwater/dingy rowing people and not just whitewater.

I have seen quite a bit of cedar used for paddles.
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