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Soloing the Oasis Tandem http://www.hobie.com/forums/viewtopic.php?f=11&t=7970 |
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Author: | kepnutz [ Wed Sep 26, 2007 7:41 am ] |
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Hi-ya going Roadie ! Kepnutz |
Author: | sbsyncro [ Wed Oct 10, 2007 8:41 am ] |
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I'm reading this thread with great interest, as I have an Outfitter rigged for fishing and 90% of my trips are solo. I regularly range a mile or two off the coast here in Santa Barbara, CA and have had problems with the "hull slap" mentioned in this thread. I like this idea of adding shot to the front Mirage Plug, but I am concerned about the extra stress this might put on the front drive well. It looks like the mirage plug rests its weight entirely on the two "pins" that locate in the locking mechanisms. This means that the mass of 10kgs of shot in the drive plug is being "focused" on two relatively tiny mounting points, which were certainly not designed for this purpose... Just wondering if anyone has had problems with this snapping off, or any other sorts of deformation of the mounting points... Thanks in advance -Brent |
Author: | stringy [ Wed Oct 10, 2007 6:19 pm ] |
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I like this idea of adding shot to the front Mirage Plug, but I am concerned about the extra stress this might put on the front drive well. It looks like the mirage plug rests its weight entirely on the two "pins" that locate in the locking mechanisms. I actually came up with the idea of filling the drivewell plug for ballast after finding one had filled up with water when we were on our first shallow freshwater creek trip without the mirage drives in. One of the locating side 'pins' had been split- probably from new. Anyway I was surprised to find how heavy it was when removing it. Because I use my tandem solo I added a bung plug to the drivewell plug and filled it with water. I realised more weight was needed and used the lead shot. I have beeen using the weighted driveplug for 5 months now and there is no stress to the drivewell. The weight is actually carried by the front and rear slots which are designed to handle the stress of pedaling. The locating pins don't bear much of the weight at all. As the plug is submerged it's not really subject to much stress anyway. I have had no problems so far- apart from distorting the hollow plastic pins by overtightening the cam bolts the first couple of times. The plug only needs to be snug under the cambolts- not tight like the drive. It would be interesting to know what pressures a tightened down mirage drive is exerting on the drivewell. I reckon it would be a lot more than 10kg. |
Author: | sbsyncro [ Fri Oct 12, 2007 8:16 am ] |
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Great posts and great ideas - I think I might have to try this out. Now the only remaining problem is how to transport all this weight to the beach. The Outfitter is already a monster to handle solo, and I often launch from beaches where a 100 yard scramble down goat paths to the beach is not uncommon. Looks like instead of two or three trips down, it will now be three or four! |
Author: | stringy [ Sat Oct 13, 2007 3:48 am ] |
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Many thanks for the very useful hints Roadrunner. |
Author: | kepnutz [ Sat Oct 13, 2007 8:38 am ] |
Post subject: | faster than that |
Hey |
Author: | sbsyncro [ Sat Oct 13, 2007 9:13 am ] |
Post subject: | |
Some interesting thoughts there. I have noticed that when the wind gets "fresh" and things start getting fun, the side-slip is so bad that probably 20 to 30% of the wind energy is being deflected into sideways motion. I'm not sure a surfboard fin would do much more than just installing the forward mirage drive and making sure the fins were both in the "down" position (which I have done). Even with that arrangement the side-slip is pretty bad. I think that it would take a lot more area on a daggerboard to cure this problem. I wonder if something could be arranged that could be dropped over one side, much like some of the old sabots I remember sailing as a kid... Also, I'm intringued about a couple of things mentioned here - what is this "boombatten" you talk about, and also this larger sailing rudder - is it universally adaptable to all the newer (twist & flip) rudders? Thanks -Brent |
Author: | stringy [ Sat Oct 13, 2007 5:49 pm ] |
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I agree with you Kepnutz about the mast being the weak link in stronger winds. It bends like spaghetti. Anything above 12 knots and it is uncontrollable. That is why I made the roller furler seen here: http://www.hobiecat.com/community/viewtopic.php?t=7740 This allows me to get home when conditions get rough using sail power as an assist to pedalling. In fact I am now confident I could handle conditions of around 25 knots and still have some sail out. I haven't found slippage to be a problem because I am still pedalling the Turbo's at a slow cadence. I also haven't felt as if the boat would tip either. It heels over but pedalling to provide forward motion must add to the stability. I have mentioned before that Hobie should come out with a stiffer mast and larger furling sail option as I know the tandem could handle it. The mast tube may need to be strengthened though. In lighter winds the larger sail would be a bonus and you could furl it to what you are comfortable with as conditions pick up. The problem I see with stays is that they would make furling difficult. SB- You can find info on the boombatten here: http://www.hobiecat.com/community/viewtopic.php?t=7158 http://www.hobiecat.com/community/viewtopic.php?t=7439 I have made one out of a tent pole repair kit and it works great in lighter winds and is a huge improvement downwind. After reading about the improvements a larger sailing rudder makes here: http://www.hobiecat.com/community/viewt ... highlight= and here: http://www.hobiecat.com/community/viewtopic.php?t=7935 I knew it was just what I needed to stop the "weather helm" I was experiencing ( I think that's what it's called?) -when a gust overpowers the rudder and turns you into the wind. Unfortunately I have the tandem with the old style flip up rudder. Kepnutz made a very nice rudder sleeve but I am always banging the standard rudder into things and a larger one would be worse.I ended up purchasing the newer twist-n-stow mechanism and large sailing rudder and adapted it to the older system. I agree with the other positive comments and can report that it makes a huge difference. I will post a how to soon. |
Author: | kepnutz [ Wed Oct 17, 2007 7:50 pm ] |
Post subject: | |
Hey Ya.Stringy. |
Author: | VegasEric [ Wed Apr 18, 2012 7:56 pm ] |
Post subject: | Re: Soloing the Oasis Tandem |
I have a question about ballast on a Oasis. I filled the drivewell plug with about 23 lbs. of lead shot. I have a 3" diameter by 15" long drain pipe also filled with lead shot (approx. 30 lbs.) (thx Roadrunner for the idea which I would like to put in the front hatch and hold it in place with velcro. I was wondering if the bottom of the front hull is strong enough to handle it? It would be nice to leave the front passenger area open for ice chest, supplies, etc. when I take it out solo and not use water bags for ballast all the time. Do you think it will handle it, or will it deform the hull? Thanks in advance! |
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