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Building a Coincidence http://www.ducatittandf1.com/viewtopic.php?f=25&t=60	Page 2 of 5

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Author:	littlemono82 [ Fri Nov 19, 2010 7:27 am ]
Post subject:	Just some pixies from the build
Tonight we made the first attempt at bending one of the down frame pipes and the first two engine mounting points. The prototype is laying in front of the frame jig. We bend it a little to far and the metal started to wobble on the inside of the bend. This happend because we never before used such a large diameter of pipe for a frame, but because of the size of the original pantah frame and wanting to stay as close as possible to the classic look, we choose this size of pipe. The second attempt was a little longer or you could say that the bend is a little closer to the engine. Attachments: File comment: my starting point the drawing Drawing pantah.JPG [ 117.06 KiB | Viewed 2260 times ] File comment: Getting started with the cases fixed on the frame jig Getting started.JPG [ 131.89 KiB | Viewed 2260 times ] File comment: the first one is on the jig First pipe.JPG [ 136.62 KiB | Viewed 2260 times ] File comment: The second pipe second pipe.JPG [ 123.95 KiB | Viewed 2260 times ] File comment: makung an extra support for the top pipes DSCF1876.jpg [ 137.5 KiB | Viewed 2260 times ] File comment: building the 3th and 4th pipes DSCF1881.jpg [ 131.87 KiB | Viewed 2260 times ] DSCF1874.jpg [ 151.77 KiB | Viewed 2260 times ] File comment: 3+4 from the back DSCF1875.jpg [ 132.55 KiB | Viewed 2260 times ]

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Author:	littlemono82 [ Sat Nov 20, 2010 3:22 pm ]
Post subject:	The tank and seat
These will be the tank and seat that we use at the start of our first season with the bike, later we may try and build a copy of the tank, because it only hold about 16 liters and an real endurance racer has of course a tank with 24 liters. But for the start we have lots more things to do before we can even start to think about a larger tank. The seat might be more of a problem, because it might not fit over the shocks? Lots more details will follow soon. Attachments: File comment: Tank and seat on the standaard frame Tank and seat.JPG [ 124.95 KiB | Viewed 2260 times ] File comment: tank Tank.JPG [ 124.84 KiB | Viewed 2260 times ]

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Author:	littlemono82 [ Tue Nov 23, 2010 6:06 am ]
Post subject:	Building the seat height
Making the pipes 3 and 4 into the right seat position was a intensive job. To get the curves going up, right or left at the same time was quite a challange. The first pipe was the most difficult one, after that i had some measurements to look at, so i could aim at the same end position for the pipe 4. The seat height will be around 80-82 cm depending on the thickness of the foam we place on the polyester seat. Because of the shape of the seat we decided to get at last 2 cm of foam, but 3 or 4 would be better for our bottom side when we are going to race for more then 30 minites. Making the upper pipes fit, to the support getting the curves in the right place was for the first two bends behind the headstock not too difficult, but then i started to make the second curves at the place where the rider will sit and these are double curves up and sideways, these gave my quite a headache. The support frame for the upper pipes has been build for easy dissembled parts, so that after the upright have been tackwelded in place we can take the frame out before we can continue building the angled pipes. Am using a handcraft pipe bender for this work and correcting the bends is not easy with this tool. Attachments: DSCF1880.jpg [ 151.78 KiB | Viewed 2260 times ] DSCF1882.jpg [ 133.79 KiB | Viewed 2260 times ] DSCF1884.jpg [ 144.64 KiB | Viewed 2260 times ] DSCF1885.jpg [ 135.94 KiB | Viewed 2260 times ]

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Author:	littlemono82 [ Thu Nov 25, 2010 6:28 am ]
Post subject:	Rutter's rear suspension
Got this peace of information after an email to maxton engineering: Hello, I am in the proces of building a replica Ducati pantah racebike. At the moment i am designing the rear suspension for this classic bike. After studing the pictures of Tony Rutter's Pantah i wonderd why the shock was mounted vertical? I found some info about th owner Sports Motorcycles telling me that maxton worked on the suspension parts for this bike. Do you have any information about this bike from the year 1981? Kind regards Remco Remco Yes we did work on that bike in 1981. It was a modification carried out for the Isle of Man TT. We moved the bottom shock ‘pick up’ forwards to soften the shock absorbers. We did not supply the twinshocks. We also strengthened the swing arm and frame to suit the new shock position. Today we would not move the bottom pick, we would simply respring or revalve the shock absorbers softer. Then it was very difficult to get the shock absorber manufacturers to do this. We manufacture our own twinshocks now, so it is very easy! Best regards Richard Adams Maxton Engineering

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Author:	sprtwn [ Thu Nov 25, 2010 5:52 pm ]
Post subject:	Re: Building a Coincidence
THAT....IS.....DAMN.....CLEVER....!!!!! you just have to ask the right people i guess.

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Author:	littlemono82 [ Thu Nov 25, 2010 6:39 pm ]
Post subject:	Rutter's suspension
And use the right software. With our measurements from the original pantah and our modern knowledge from suspensions, we could not understand why they did move the shocks so far forward. The only 2 things that happen is more wheel movement with less shock movement and you need a stiffer spring. But you loose the progressive design with that position, the rear suspension will get regressive and that's not what we would like to have. We want soft springs with a lot of wheel movement for good rear wheel roadholding and we want some anti squad with the position of the swingarm. At the same time, good anti squad gifs more groundclearns which is also very handy with modern tyre grip and the way the exhaust route follows through on the lefthandside. Attachments: File comment: software drawing for the rear suspension rear sus pantah.jpeg [ 24.83 KiB | Viewed 2260 times ]

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Author:	littlemono82 [ Sun Nov 28, 2010 1:19 pm ]
Post subject:	Some pipes
Some more pictures from the stand-up and cross pipes, took some discusion about the cross pipes how much the room we need around the front carburator and the rear cylinder. The front carburator with a malossi manifold is quite far outwards, which makes the floatbowl touch pipe 2. The first thing we did was modify the manifold and turn the carb about a cm more to the rear cylinder. Then we decided to put pipe 2 1 cm more to the right than the left one. The next step was to curve the cross pipe around the inlet tube. On the left the cross pipe needs to make a little bit of room for the fins of the rear cylinder. Attachments: DSCF1886.jpg [ 124.01 KiB | Viewed 2260 times ] DSCF1887.jpg [ 137.12 KiB | Viewed 2260 times ] DSCF1888.jpg [ 133.86 KiB | Viewed 2260 times ] DSCF1889.jpg [ 138.18 KiB | Viewed 2260 times ] DSCF1890.jpg [ 123.18 KiB | Viewed 2260 times ] DSCF1891.jpg [ 143.15 KiB | Viewed 2260 times ]

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Author:	loudbike [ Sun Nov 28, 2010 10:23 pm ]
Post subject:	Re: Building a Coincidence
Guys, this is fascinating stuff! I haven't seen a frame built since my days hanging out with Doug Cook in New Hampshire.. Thanks for keeping the pics and story going..

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Author:	littlemono82 [ Tue Nov 30, 2010 7:10 pm ]
Post subject:	Thanks
Hello steve, Thanks for starting this forum. We will keep posting our progress till we start racing and get to busy having fun. Groet Remco

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Author:	littlemono82 [ Wed Dec 01, 2010 5:58 pm ]
Post subject:	Hitting a problem
And than there was a tiny little problem: when we tried to fit the tank over the frame we discovered to our disbelief that it wouldn't fit over the cross pipes. So one step: taking the grider and the cross pipes were quickly removed from the frame. All the pictures in books and on the internet about strengthened pantah frame didn't really provide an answer. So i made the curved cross pipes straight again and started to fidle with them to find a solution. Attachments: File comment: The root of all our trouble, the shape of the bottom of the tank DSCF1938.jpg [ 106.62 KiB | Viewed 2260 times ] File comment: Before, DSCF1894.jpg [ 140.82 KiB | Viewed 2260 times ] File comment: And after, spot the difference: DSCF1899.jpg [ 146.21 KiB | Viewed 2260 times ]

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