Hypothetical design

DIscuss anything relating to non-standard cycles and their equipment.
Grldtnr
Posts: 18
Joined: 11 Jun 2020, 7:04pm

Hypothetical design

Postby Grldtnr » 16 Sep 2020, 7:04pm

I will have to wait for my multi million lotto win to come in, but I would like to build a FWD,steer, braked recumbent tadpole trike, suspension all round, with a tilting facility, carbon fibre chassis is on the wish list.
The tech is out there, one of the simplest cars the 2CV employs the technology FWD ,inboard disc brakes,very pliant suspension, so why can't I have that on my dream machine?
Mike Burrows might be the go to engineer for this imaginery project.
Or is one available already?

Jdsk
Posts: 2224
Joined: 5 Mar 2019, 5:42pm

Re: Hypothetical desigin

Postby Jdsk » 16 Sep 2020, 7:14pm

Why FWD, and what are your thoughts about the drivetrain?

Jonathan

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[XAP]Bob
Posts: 17670
Joined: 26 Sep 2008, 4:12pm

Re: Hypothetical desigin

Postby [XAP]Bob » 16 Sep 2020, 7:15pm

Weight
A shortcut has to be a challenge, otherwise it would just be the way. No situation is so dire that panic cannot make it worse.
There are two kinds of people in this world: those can extrapolate from incomplete data.

Grldtnr
Posts: 18
Joined: 11 Jun 2020, 7:04pm

Re: Hypothetical desigin

Postby Grldtnr » 16 Sep 2020, 7:27pm

Jdsk wrote:Why FWD, and what are your thoughts about the drivetrain?

Jonathan


Hypothetically, FWD coz a short chain run, depending on how far the front axle is, it should give traction, and handling,thinking of a differential , Longstaff used to build his own putting 2 freewheel bodies back to back.

Weight shouldnt be a problem if built of Carbon fibre, the drive train probably needs to be metal.

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Tigerbiten
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Joined: 29 Jun 2009, 6:49am

Re: Hypothetical desigin

Postby Tigerbiten » 16 Sep 2020, 8:41pm

FWD has been tried in tadpole trike but it's never been very successfully implemented.

Back Wheels are easy because they don't need to turn.
Front wheels are much more complex because you need some form of CV joint in the kingpins.
Then you want it to tip which adds at least another set of UV joints to an already complex setup.
Then depending on how it's setup the half shafts may well alter in length slightly, this must be also be accommodated for if needed.
So not simple.

Luck ............. :D

hercule
Posts: 1036
Joined: 5 Feb 2011, 5:18pm

Re: Hypothetical desigin

Postby hercule » 16 Sep 2020, 9:53pm

Front wheel drive:
http://www.eland.org.uk/s327.html
"Denman" on Bentrider Online also built a FWD tadpole but it never entered production afaik... pictures of it looked really good though

All wheel drive:
https://tadpolerider2.wordpress.com/201 ... happening/

Tilting:
http://www.tripendo.de/galerie

Carbon Fibre:
http://carbontrikes.com (now working with Bacchetta)

As [XAP]Bob says, the more complications you add to the machine the more challenged your 1 human-powered engine will be - by weight and power losses in the transmission. The differential on my Kettwiesel definitely eats up some of my meagre power output, though a straight power side chain line does compensate. My VTX is as simple as it gets and it's a very good (quick, comfortable and light) machine. Though my FS Trice QNT is still hard to beat.

I don't know if the Steintrikes Wild Wave entered production: https://tadpolerider2.wordpress.com/201 ... ing-trike/