Ducati TT1, Ducati TT2 and Ducati 750 F1 Forum
http://ducatittandf1.com/

Frame tt1 and tt2 rake
http://ducatittandf1.com/viewtopic.php?f=10&t=11770		 Page 1 of 1
Author:  750TT [ Fri Apr 13, 2018 7:37 am ]
Post subject:  Frame tt1 and tt2 rake
Someone has this information, what steering angle they have ..Thanks
Author:  nick gill [ Sat Apr 14, 2018 2:40 am ]
Post subject:  Re: Frame tt1 and tt2 rake
750TT wrote:
Someone has this information, what steering angle they have ..Thanks

The problem with this conversation is how to measure it. The problem is even worse when we talk about trail, which is really the only number that matters.
I suggest you define it as the angle measured from a perpendicular - that comes from the crankcase horizontal ribs.
Image
Usually the rake and trail numbers are from the drawing board. In this setting the suspension is topped out, as it would be if placed on a table in front of you.
In this way the weight of the chassis and rider does not interfere with the geometry quoted.
I hope you can get a sense that comparing numbers among friends is useless unless you replicate the way that they were measured.
I hope this helps you.
Author:  750TT [ Sat Apr 14, 2018 4:05 am ]
Post subject:  Re: Frame tt1 and tt2 rake
Thanks Nick.
Author:  ducadini [ Mon Apr 16, 2018 3:10 am ]
Post subject:  Re: Frame tt1 and tt2 rake
Some of the Beneluxheads started a few years ago with drawing a .dwg of the SS frame but since most of us have also a job to do and bare frames of bevel SS are not found easily, that project came to a stop.
There were a few framemakers who made TT2 and TT1 frames but I guess they just made a jig to fit headstock and enginemounts and then just "connected the dots" ;)
Since (I guess) a few of us have a bare frame someplace , there is a "fairly easy" method to compare (important and critical) dimensions (except the Original Pantah frame which has the extentions to the lower enginebolts).
Just put the frame on a flat surface so that the headstock rests on the table, together with the front enginebolt.
Fitting a pair bearings and inserting a tube so that You can mark the contactpoint of the virtual line that goes through the center of the headstock.
With all the known and measurable dimensions it's fairly easy to draw a .dwg (or similar) and compare the three things that matter (at least that's what I think) : angle, height and distance from the headstock to the front enginebolt.
The rest are fixed points OR personal preferences within the known dimensions such as ride height and trail.

browsing your tubes can deliver a few tips of how it's done.
The rest is blood, sweat, tears and cash :lol:

Of course it would be easier if I just went to Verlicchi and asked for the Original drawings :lol:

And now back to the "digital drawingboard" to draw my new personal Ducati workspace in progress.

ciao
ducadini
Author:  Sam [ Tue Apr 17, 2018 4:51 am ]
Post subject:  Re: Frame tt1 and tt2 rake
750TT wrote:
Someone has this information, what steering angle they have ..Thanks



From what I found out researching this years ago when speaking to Derek Chittenden of Hejira

Rake 64 deg (26 deg if you look from the other side of the fence)

trail 105mm (but will all depend on your riding style/preference )

Sam
Author:  nick gill [ Tue Apr 17, 2018 6:03 am ]
Post subject:  Re: Frame tt1 and tt2 rake
Sam wrote:
trail 105mm


But measured how Sam? This is just a number right now.....you see?

Thanks for sharing!
Author:  750TT [ Tue Apr 17, 2018 7:11 am ]
Post subject:  Re: Frame tt1 and tt2 rake
Sam wrote:
750TT wrote:
Someone has this information, what steering angle they have ..Thanks



From what I found out researching this years ago when speaking to Derek Chittenden of Hejira

Rake 64 deg (26 deg if you look from the other side of the fence)

trail 105mm (but will all depend on your riding style/preference )

Sam

Hi Sam.
Thanks for the data, it's what I was looking for :idea: ..
Author:  Sam [ Tue Apr 17, 2018 10:23 am ]
Post subject:  Re: Frame tt1 and tt2 rake
nick gill wrote:
Sam wrote:
trail 105mm


But measured how Sam? This is just a number right now.....you see?

Thanks for sharing!


The way I was taught to measure the trail is to take a centre line through the steering head to the ground ( not through the fork tube centre) then drop a plumb line from the centre of the wheel spindle , measure the distance in between both points and there is your trail. Get a copy of Motorcycle chassis design by Tony Foal ISBN 0-85045-560-X lots of theory there.

Sam
Page 1 of 1 All times are UTC - 5 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/