Graupner's Rubin 1170 mm Yacht - Page 8 - RC Groups
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Apr 19, 2016, 08:48 AM
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Daniel Gut's Avatar
And now the excuses for the delay ... the winch has been a source of massive irritation, I don't know if I got a bad one, but it is going back to the shop tomorrow, still in the boat and with the radio. It will be worth taking a few minutes to demonstrate the problem and test another for the same symptoms. As it is now, it cannot sail . Keel 2 has it's "make up" on and the float test is encouraging.
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Apr 20, 2016, 06:05 AM
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My honour has been saved, the winch I got was a lemon and fortunately behaved as atrociously during the demonstration, as it did at home. We tested a new there and it was quiet and completely non twitchy. So ... the first sail could now even happen on the weekend ... if it does not hose with rain as the predicion sees it currently.
Apr 22, 2016, 11:23 AM
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Winch problems can make anyone grumpy
Apr 24, 2016, 04:59 AM
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Daniel Gut's Avatar

Eureka


Well the winch problems continued ... the problem being that when switching on, the winch would sometimes stay in it's position and sometimes move into an over extended postion, ie. well past close hauled and sometimes do damage. The lemon winch did this too. I started a systematic problem search, by giving the winch the benefit of the doubt and looking elsewhere. Instead of a Lipo (without voltage limiter) I tried 4 NiMh cells, no change.
Swapped the receiver for a smaller newer one, no change. A foot note here is that I am not a motor person, not in boats and not in my gliders either. Having said that, I started thinking about the radio, which is new and was bought for my sons Micro Magic. The winch gets programmed onto the gas channel. The motor in a model is governed by the ESC in the model, which also prevents the motor going "online" if the throttle is open in any way. I tested switching on with the sail close hauled to its limit (throttle closed) ... no more problem after repeated tests. So it would appear the radio has a safety feature built into it. If the throttle was even slightly open the winch went into overextend automatically (throttle closed)
I delved into the manual and then into the "bilge" of the radio and see there, a 1 got changed to a zero and that was that. All that irritation, the repairs and many sense of humour failures for a 60 second programming change .... moral of the story ... when all else fails, read the book of words!
So! there is nothing standing in the way of the first sail .... except that it has been snowing outside!
The Winch is now super, loads of travel, precise and seriously strong.
May 10, 2016, 12:29 PM
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Today was the day ... finally a bit of wind, no rain and time. The Rubin got unceremoniously plonked into the water and shoved out into about 8 knots of onshore breeze into short steep little waves. Sheeted in and off it went pointing high and sailing straight without any steering necessary, when the breeze picked up the boat started to gently head up into wind. Squeezed the main trim a cm or two and it stops immediately, after a few minutes I was sailing upwind without rudder and playing a cm or three with the main sheet. I have read and heard that the Rubin is a bit of a Diva, it is very sensitive to trim and I saw just how well it reacts to small changes. That main trim servo is so very cool. The Graupner winch behaved impeccably and I am very happy with my keel. The standard setup does not allow for the rig to be raked back at all, because of the weather helm makes sailing difficult. With the keel being slightly further back on mine the rig is slightly raked and I was impressed with how nicely the boat went up wind. After about 25 minutes and before I could take pictures, a little piece on the masthead holding the backstay broke and I nursed it back to the jetty downwind without that soft bendy mast falling down. A little repair and it will be out again for a video shoot.
All in all ... I am well pleased with the result and think I might celebrate with a darn good G&T.

Regards from Zurich

Daniel
May 16, 2016, 10:28 AM
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Yesterday was another 25 minutes session on the water, reason for the short outing was increasing breeze and water in the hull... so hands full and no time to film or take pictures.
Went out in about 10 to 12 knots and 30 to 50 cm waves, lots of tension on the backstay and Cunningham to flatten the main, opened up the leech with the kicker (not too much or it flogs). The jib got the same treatment, tight luff and open in the top. The mast is still slightly raked back. Boat in the water and out. I suspected I might get water in the boat, because I pulled the old seal off that was around the deck opening and have not replace it yet. Added to that the previous owner made the opening through the deck for the mast way too big and that in the end was the biggest culprit in letting water. The boat behaved very well, I did not have any weather helm, not even in the gusts as the wind started picking up. The main trim servo was all I needed upwind and the boat looked gorgeous heeled over and banging through monsterous waves (relative to its size) Even as the wind picked up to about 15 knots I could still hold and control it well under full sail. Downwind it surfed and got really twitchy at the speeds it was doing, I need to play with the throws on the rudder. As the wind got up I stuffed the bow a few times going downwind and that is where I suddenly had half a litre of water in the boat.
To do: Seal the hatch and mast, make a bung screw in the stern to let water out, increase the mast rake slightly ( a tiny bit of weather helm is good) and get a video made
To the other Rubin builders, I would recommend the main trim servo, the boat reacts brilliantly to it. The keel mod is not a must, it suits the way I sail and conditions in which I like to sail. If you sail in mostly light winds the original position is fine, but the weight must go back. The easiest could be to hang the bulb further back on the keel and play with battery positions. I am now hoping to find a few more Rubin sailors to sail with and compare notes.

regards from Zürich
Daniel
May 16, 2016, 01:29 PM
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DLord's Avatar

Rubin


Congratulations, Daniel! It's been interesting reading........ Good luck finding someone to compare notes with.
May 18, 2016, 12:14 AM
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Daniel Gut's Avatar
Thanks Doug

I suspect you are the only other participant in this thread ... and I haven't even thought about foils on the Rubin yet
May 18, 2016, 08:24 AM
Boomer1
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So what am I, chopped liver? Who started this discussion anyway.
Just kidding. Your contribution is exactly what I'd hoped would develop. Good stuff. Be nice if a few others would share their thoughts on these classic yachts.
Boomer
Apr 18, 2017, 09:22 PM
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Whats going on with your Rubin Boomer?
Apr 21, 2017, 02:19 AM
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Two Rubin fleet


I have two Rubin's but have not done anything with them. Thought a One Ton group of models would be a cool thing. Just haven't started yet....


D
Sep 15, 2017, 06:27 AM
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Daniel Gut's Avatar

Development


A few more thoughts for the Rubin database. After many pleasurable hours on the water and a lot of fiddling with trim, twist, mast rake (back) etc. I feel my Rubin is sailing very nicely and is impressively fast.

• I have the mast rake a little further back still, so that when the boat starts to get pressed up a bit, the weather helm gently takes the load off. If I then ease the main trim servo it will carry on in a straight line.
• The jumper spreader has been moved down to where the top mast section goes into the middle (the original Rubin mast is 3 piece) and it has a decent amount of tension on it. This allows more backstay tension (and therefore more forestay tension) without completely flattening out the mainsail in the top third, where the mast is softest.
• The mainsail does not like being too close hauled, the boats points very high with the boom a cm or two off centre (measured at the attachment point).
• The jib should be a mm or three inside the side stays.
• Aesthetically, the tack of the jib should be as low as possible and lining up (along the forestay) with the point on the deck where it would be attached if it weren’t a model. Anyone who does not attach the stanchions to the hull can put the jib almost on the deck, it will look so much better there. I like the look of the stanchions and have put it 2mm above the pulpit.
• I moved the battery further back and trimmed the boat that the waterline lies precisely on the hull/bow transition.
• The “mast through the cabin” construction is tiresome, every entry into the hull requires the rig to be removed and that includes charging the LiPo. My battery has an extended charching cable that goes through the coach roof and under the hatch cover. A magnetic on/off switch is also under the hatch cover.

In my research on the Rubin model before I bought one (mostly in the German forum) many suggested or actually did install a jib trim servo as a means of countering the weather helm when the wind is inconsistent. I don’t understand why this option was considered before a main trim servo, which has made sailing so much fun and on the water trimming/setup so easy. For those of you still building your Rubin, it is a must, you will not be sorry.
I will try and post a few pictures later. I made a not very good video the other day and will see if I can get it online this evening too.

Regards from Zurich

Daniel
Last edited by Daniel Gut; Sep 18, 2017 at 12:34 AM.
Oct 11, 2017, 10:55 AM
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Well Daniel,

I just signed up here. I've followed this tread from start...

I actually own two Rubins and one of my brothers owns one as well! (We sail in "real life" too, and we both own Judel Vrolijk designed yachts!)

Anyway; I love your modified keel, and was thinking of doing the same too. My Rubins are... well one needs a total refit, and the other is near untouched and in the box. (The one my brother has is really new in the box!)

At the moment I'm busy a lot of other yachts... From a Skandia, to a Comtesse, to an early -old school- mirco magic, to a Seawind, a vintage M class Diana, a Sirius RS32, and a Saudade... (...and have a few rare collectable motorboats. Vintage stuff(NIB) I bought when the opportity occured...)

Except from the Saudade are all of them ready to sail. After that I'll start on the Rubin(s).
Oct 11, 2017, 11:17 AM
Boomer1
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Welcome!
It would be great if you would share some pictures of your fleet. You have some really classic yachts. Here in the U.S.
we don't see many of these. Most were sold on the other side of the pond.
Very hard to find them. Shipping costs made them pretty costly for the average hobbyist.
Thanks in advance for any pictures you can post.
Boomer
Oct 11, 2017, 01:40 PM
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Daniel Gut's Avatar
Hi Radiosailor
Welcome to the virtual yachting scene.
I would love to have a Rubin kit, I would do lots of things differently if I had the chance. Not that I am unhappy with mine, I really enjoy sailing it, it rewards you with pace when you do things right. I am in the throws of moving house and will finally have the hobby room I have missed for so long. My Rubin is going to be getting an adjustable backstay, powered by a light strong little winch that I found. The backstay has a significant influence on the shape and twist of the main sail. I will post pictures here when the project gets started.

Don't forget to test the keel casing for leaks before you put the deck on and if you want some measurements of my keel, just ask. I wont be expecting any questions soon though, not with all those boats that still need your attention being higher on the priority list Are you dutch?

Regards from Zürich

Daniel


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