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 Post subject: Just some pixies from the build
PostPosted: Fri Nov 19, 2010 7:27 am 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
Drawing pantah.JPG [ 117.06 KiB | Viewed 938 times ]
File comment: Getting started with the cases fixed on the frame jig
Getting started.JPG
Getting started.JPG [ 131.89 KiB | Viewed 938 times ]
File comment: the first one is on the jig
First pipe.JPG
First pipe.JPG [ 136.62 KiB | Viewed 938 times ]
File comment: The second pipe
second pipe.JPG
second pipe.JPG [ 123.95 KiB | Viewed 938 times ]
File comment: makung an extra support for the top pipes
DSCF1876.jpg
DSCF1876.jpg [ 137.5 KiB | Viewed 938 times ]
File comment: building the 3th and 4th pipes
DSCF1881.jpg
DSCF1881.jpg [ 131.87 KiB | Viewed 938 times ]
DSCF1874.jpg
DSCF1874.jpg [ 151.77 KiB | Viewed 938 times ]
File comment: 3+4 from the back
DSCF1875.jpg
DSCF1875.jpg [ 132.55 KiB | Viewed 938 times ]

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Last edited by littlemono82 on Thu Jun 16, 2011 12:46 pm, edited 1 time in total.
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 Post subject: The tank and seat
PostPosted: Sat Nov 20, 2010 3:22 pm 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
Tank and seat.JPG [ 124.95 KiB | Viewed 938 times ]
File comment: tank
Tank.JPG
Tank.JPG [ 124.84 KiB | Viewed 938 times ]

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Last edited by littlemono82 on Thu Jun 16, 2011 1:59 pm, edited 2 times in total.
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 Post subject: Building the seat height
PostPosted: Tue Nov 23, 2010 6:06 am 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
DSCF1880.jpg [ 151.78 KiB | Viewed 938 times ]
DSCF1882.jpg
DSCF1882.jpg [ 133.79 KiB | Viewed 938 times ]
DSCF1884.jpg
DSCF1884.jpg [ 144.64 KiB | Viewed 938 times ]
DSCF1885.jpg
DSCF1885.jpg [ 135.94 KiB | Viewed 938 times ]

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Last edited by littlemono82 on Thu Jun 16, 2011 1:33 pm, edited 3 times in total.
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 Post subject: Rutter's rear suspension
PostPosted: Thu Nov 25, 2010 6:28 am 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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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 Post subject: Re: Building a Coincidence
PostPosted: Thu Nov 25, 2010 5:52 pm 
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Joined: Tue Nov 09, 2010 6:10 pm
Posts: 2
Location: amsterdam
THAT....IS.....DAMN.....CLEVER....!!!!!
you just have to ask the right people i guess.


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 Post subject: Rutter's suspension
PostPosted: Thu Nov 25, 2010 6:39 pm 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
rear sus pantah.jpeg [ 24.83 KiB | Viewed 938 times ]

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Last edited by littlemono82 on Thu Jun 16, 2011 1:21 pm, edited 1 time in total.
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 Post subject: Some pipes
PostPosted: Sun Nov 28, 2010 1:19 pm 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
DSCF1886.jpg [ 124.01 KiB | Viewed 938 times ]
DSCF1887.jpg
DSCF1887.jpg [ 137.12 KiB | Viewed 938 times ]
DSCF1888.jpg
DSCF1888.jpg [ 133.86 KiB | Viewed 938 times ]
DSCF1889.jpg
DSCF1889.jpg [ 138.18 KiB | Viewed 938 times ]
DSCF1890.jpg
DSCF1890.jpg [ 123.18 KiB | Viewed 938 times ]
DSCF1891.jpg
DSCF1891.jpg [ 143.15 KiB | Viewed 938 times ]

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Last edited by littlemono82 on Thu Jun 16, 2011 2:02 pm, edited 2 times in total.
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 Post subject: Re: Building a Coincidence
PostPosted: Sun Nov 28, 2010 10:23 pm 
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Joined: Sun Aug 08, 2010 4:37 pm
Posts: 360
Images: 6
Location: Ottawa, Ontario, The Great White North
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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 Post subject: Thanks
PostPosted: Tue Nov 30, 2010 7:10 pm 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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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 Post subject: Hitting a problem
PostPosted: Wed Dec 01, 2010 5:58 pm 
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Joined: Fri Oct 15, 2010 5:28 am
Posts: 52
Images: 85
Location: Amsterdam
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
DSCF1938.jpg [ 106.62 KiB | Viewed 938 times ]
File comment: Before,
DSCF1894.jpg
DSCF1894.jpg [ 140.82 KiB | Viewed 938 times ]
File comment: And after, spot the difference:
DSCF1899.jpg
DSCF1899.jpg [ 146.21 KiB | Viewed 938 times ]

_________________
"Racing is life. Anything before or after is just waiting"
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Last edited by littlemono82 on Thu Jun 16, 2011 2:07 pm, edited 2 times in total.
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