Three Wheelers - Your opinions and expertise wanted!
Discussion
Martin, be good to see any updates, your design is similar to something I've been pondering but with a litre bike engine mounted behind the driver instead of your electric motor...
I'd even been considering the mono front shock - formula BMW used them with some very trick rotary dampers to control roll...
Unfortunately, I haven't the first idea about suspension design. The rest I can pretty much cope with, but designing the front end is way beyond me. Are there people/firms that design work can be outsourced to for reasonable cost?
I'd even been considering the mono front shock - formula BMW used them with some very trick rotary dampers to control roll...
Unfortunately, I haven't the first idea about suspension design. The rest I can pretty much cope with, but designing the front end is way beyond me. Are there people/firms that design work can be outsourced to for reasonable cost?
ajprice said:
Completely different car, but the Koenigsegg Agera has a third shock absorber joining the rear wheel set ups. It's called triplex, and is (I think) supposed to keep both wheels on the ground over a corner bump and reduce squat under acceleration.
Drifting off-topic, but the Koenigsegg 'triplex' set-up is really just a variation on quite an old concept of using a 'floating' transverse monoshock set-up. The first car I'm aware of that ran this arrangement (though there may have been others) was Len Terry's Terrier Mk. 6 from 1962:
In the Terrier installation, it was intended to completely separate bump and roll spring resistance, though in the Koenigsegg, as you say, it merely provides additional resistance to squat.
The really clever (though originally unintentional) side-effect, though, is that it cancels out the unwanted side-effect of the ARB: in a single wheel bump, a conventional ARB tries to lift the opposite wheel off the ground, thus degrading grip. With the transverse monoshock arrangement, the monoshock is trying to force the opposite wheel down at the same time as the ARB is trying to lift it so (depending on their relative stiffnesses) they cancel each other out to some degree.
Back on topic... I have to say that I'm not at all convinced that manually controlled tilt is a good idea on any trike faster than a HPV. I agree that computer servo/hyraulically controlled tilting is beyond the scope of a budget, amateur-built trike, but I'd be looking to find a geometric means of tilting the vehicle automatically and in proportion to the cornering force, probably using dual roll centres.
TheLastPost said:
I agree that computer servo/hyraulically controlled tilting is beyond the scope of a budget, amateur-built trike, but I'd be looking to find a geometric means of tilting the vehicle automatically and in proportion to the cornering force, probably using dual roll centres.
Why do you say that? There are a large number of cheap and easy to use boards that can do the control more than well enough to get a project going. You would then need to add the actuator. ceebmoj said:
Why do you say that? There are a large number of cheap and easy to use boards that can do the control more than well enough to get a project going. You would then need to add the actuator.
The board is the least of your worries (if you have the electronics and programming experience to wire it up and program it). - You then have to understand enough about vehicle dynamics to be able to write the software.
- You also have to add the sensors, the actuator, the pump to power the actuator, control valves and an accumulator to store the pressure from the pump.
I'm not saying it's not possible, but it wouldn't be a budget project and to do it right would take a level of knowledge and engineering resource that I think would be beyond most amateurs or kit car manufacturers.
Noah Katz said:
How is that possible for the stiffness in vertical motion at each side not to result in associated roll stiffness?
If you look at the photo, you'll see that if you disconnect the anti-roll bar, there's nothing to 'prop up' the sprung mass - the transverse coilover is just connected from suspension rocker to suspension rocker, not to the sprung mass, which would simply 'fall over' (in practice, everything would collapse over until something - a wishbone or driveshaft - reached the limit of its articulation) without the ARB to stop it from rotating.Similarly, if you took away the coilover, the ARB on its own would simply rotate freely in its bearings and the sprung mass would collapse onto the ground.
TheLastPost said:
ceebmoj said:
Why do you say that? There are a large number of cheap and easy to use boards that can do the control more than well enough to get a project going. You would then need to add the actuator.
The board is the least of your worries (if you have the electronics and programming experience to wire it up and program it). - You then have to understand enough about vehicle dynamics to be able to write the software.
- You also have to add the sensors, the actuator, the pump to power the actuator, control valves and an accumulator to store the pressure from the pump.
I'm not saying it's not possible, but it wouldn't be a budget project and to do it right would take a level of knowledge and engineering resource that I think would be beyond most amateurs or kit car manufacturers.
Steve
Mistrale said:
that looks great from the front 3/4. it has odd proportions in other angles though..If anyone is interested then you can buy the patterns, jigs, molds, rights and a working Stimpson Scorcher. currently on the Bay.
http://www.ebay.co.uk/itm/Custom-Trike-with-jigs-m...
ks and a speed hump than a GRP seat shell, too. 
The Campagna T-Rex has a BMW K1600 6 cylinder engine now. Less power than the Ninja engine, more torque.
http://www.autoblog.com/2013/03/14/campagna-launch...
http://www.autoblog.com/2013/03/14/campagna-launch...
Not a kit car and definatley not a track day screamer but interesting that even the americans now seem to be looking at fuel economy
https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
Vindi_andy said:
Not a kit car and definatley not a track day screamer but interesting that even the americans now seem to be looking at fuel economy
https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
I like that.https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
Vindi_andy said:
Not a kit car and definatley not a track day screamer but interesting that even the americans now seem to be looking at fuel economy
https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
Cannot get the pics to work, just buffers.https://www.eliomotors.com/my-strengths/
There was a post on one of the other forums Im on and they were worrying about fuel going over $5 a gallon, that must be nice iirc when I worked it out we are currently running at circa $10 a gallon.
OK tried grabbing some images for you but thumbsnap isnt working for me but I have put a few in an album on another forum im on and linked them to here
Hope people can see them
Now if Stig or Sat351 could do something with the Exo-Eco R
them im sure it would be 
Hope people can see them
Now if Stig or Sat351 could do something with the Exo-Eco R
them im sure it would be Edited by Vindi_andy on Monday 25th March 15:18
Edited by Vindi_andy on Monday 25th March 15:19
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