tag:blogger.com,1999:blog-3580987459140037495.post5440084925080565943..comments2024-03-18T10:29:20.125-08:00Comments on TriloBoat Talk: Hunkered Down, SortaDave Zhttp://www.blogger.com/profile/13241033623115158564noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-3580987459140037495.post-22365182301809816952020-06-27T15:00:27.255-08:002020-06-27T15:00:27.255-08:00Yep.
Our prototype is quite large (blade from a b...Yep.<br /><br />Our prototype is quite large (blade from a blue ply 55g drum, doubled over) and balanced. I figure we can cut it down if need be. <br /><br />Balance, I think, isn't necessary but won't hurt... I doubt we'll be moving fast enough for the trailing blade to overpower its tiller/preventer lanyard.<br /><br />Twist is going to be controlled by slipping over a fixed pin... it can sweep side to side but not roll. Eventually, I'd like it to pivot forward to let the blade clear the water when not in use.<br /><br />Glue is drying as I type!<br /><br />Dave ZDave Zhttps://www.blogger.com/profile/13241033623115158564noreply@blogger.comtag:blogger.com,1999:blog-3580987459140037495.post-80533344428611704352020-06-24T12:13:13.536-08:002020-06-24T12:13:13.536-08:00I imagine you can size the fin to the boat, just l...I imagine you can size the fin to the boat, just like a larger boat needs a larger rudder. You may be able to "balance" it similarly, with equal area fore/aft of the pivot point. Though a worry might be that a bigger fin also would need more power to operate. But (just a theory) your strokes would just be a longer time between switching legs (same amount of work, just spread across time, similar to a block & tackle spreads the work over time). I'm sure you could figure out a way to lock the "wrist" joint for when you wanted to use it in "rudder" mode, then unlock when you wanted "propulsion" mode.Unwise Bardhttps://www.blogger.com/profile/06603455084545858685noreply@blogger.comtag:blogger.com,1999:blog-3580987459140037495.post-48984349821452647032020-06-21T20:26:38.725-08:002020-06-21T20:26:38.725-08:00Hi UB,
I really like the look of that Bryant set-...Hi UB,<br /><br />I really like the look of that Bryant set-up... beautiful and looks like it can really deliver some push!<br /><br />One of the things I like about power fin type propulsion is their potential use as a rudder... lock the blade amidships and you've got one, albeit with a lot of force delivered to the inboard end. For smaller craft, though, and especially pedal operated, it might work as is.<br /><br />Please send pics!<br /><br />Dave ZDave Zhttps://www.blogger.com/profile/13241033623115158564noreply@blogger.comtag:blogger.com,1999:blog-3580987459140037495.post-45585186338327721552020-06-21T19:51:40.922-08:002020-06-21T19:51:40.922-08:00Looking forward to your take on the power fin. I&#...Looking forward to your take on the power fin. I'm considering adding a leg powered version for the T16 I am building. Either that, or a pedal powered yuloh (http://uk-hbbr-forum.967333.n3.nabble.com/Yuloh-td2229216.html). There is also this version of what looks very similar to the power fin (with kick-up!) from 1994: (video: https://www.offcenterharbor.com/videos/harry-bryans-thistle-pedal-powered-fin-boat/ and his description in pdf: http://www.ihpva.org/HParchive/PDF/36-v11n1-1994.pdf<br /><br />Thinking of a bar that would go across the boat and set in some 1" notches on either side. 2 bars hanging from rope from that bar would act as the pedals. Either side of the pedal would tie back to the power line going to the pedals. Have a couple pulleys to allow you to route the lines through the center of the rear window, routed through conduit or small pvc pipe.<br /><br />Leg powered and no awkward oars.Unwise Bardhttps://www.blogger.com/profile/06603455084545858685noreply@blogger.com