FWD MBB delta trike
- Thread starter Vargas
- Start date
Vargas
Well-Known Member
It is a Cruzbike
FWD means Front Wheel Drive; MBB means Moving Bottom Bracket, what for short means a Cruzbike.
A delta trike is a trike with a single front wheel, in opposition to a tadpole trike which has two wheels in the front.
Thus a FWD MBB delta trike is a Cruzbike with two rear wheels...
FWD means Front Wheel Drive; MBB means Moving Bottom Bracket, what for short means a Cruzbike.
A delta trike is a trike with a single front wheel, in opposition to a tadpole trike which has two wheels in the front.
Thus a FWD MBB delta trike is a Cruzbike with two rear wheels...
Kim Tolhurst
Well-Known Member
tippy
Hi. I have built a trike in the configuration you are suggesting actually using a CB Quest V1 20. to find it very tippy, too tippy. Power and steering causes the inside rear wheel of direction of turn to lift. Project disbanded. Remember trikes, front wheel drive when we were young?
Who will fix the tippy?
Kim.
Hi. I have built a trike in the configuration you are suggesting actually using a CB Quest V1 20. to find it very tippy, too tippy. Power and steering causes the inside rear wheel of direction of turn to lift. Project disbanded. Remember trikes, front wheel drive when we were young?
Who will fix the tippy?
Kim.
Charles.Plager
Recumbent Quant
Hi Kim,
Why, your brother,
Hi Kim,
Why, your brother, of course!
(I look forward to seeing prototypes.)
Cheers,
Charles
Why, your brother,
Hi Kim,
Why, your brother, of course!
(I look forward to seeing prototypes.) Cheers,
Charles
will_rifkin
New Member
tried it, am looking for a simple leaning mechanism
i009899,
A tall, 3-wheeled recumbent needs a means for leaning. Those mechanisms tend to be complicated, according to my searching on the web.
I tried bolting one 26-inch wheel by one end in each rear dropout just to test the principal. The bike was almost unrideable on a street with a sideways slope or crown in it. Plus, it had no rear brakes.
The people at the Dutch company, Raptobike, seem to have come up with a mechanism for leaning that slots into the rear dropouts. See http://www.raptobike.nl/blog/raptotrike/. There are a couple of still photos and a video.
There have been a number of frames for putting dual rear wheels on a road bike. The wheels are fairly far apart, and the rider still sits on top of a regular road bike seat, which enables leaning. An issue with a recumbent is that the rider has a restricted ability to lean to compensate for a cambered road. One option is to put the recumbent's seat on a flexible or pivoting base so that the rider can lean.
Putting a pivot point for the frame on a piece in the rear dropout is clever. The twin rear wheels can then follow the angle of the road, but the rider can keep the main part of the frame upright and balanced.
Some mechanisms that with such pivots employ a section of a disk brake with its caliper to enable locking the lean angle when one is stopped.
Hope that gives useful insight. Best of luck with your experimentation. There must be a simple way to do it.
Will
i009899,
A tall, 3-wheeled recumbent needs a means for leaning. Those mechanisms tend to be complicated, according to my searching on the web.
I tried bolting one 26-inch wheel by one end in each rear dropout just to test the principal. The bike was almost unrideable on a street with a sideways slope or crown in it. Plus, it had no rear brakes.
The people at the Dutch company, Raptobike, seem to have come up with a mechanism for leaning that slots into the rear dropouts. See http://www.raptobike.nl/blog/raptotrike/. There are a couple of still photos and a video.
There have been a number of frames for putting dual rear wheels on a road bike. The wheels are fairly far apart, and the rider still sits on top of a regular road bike seat, which enables leaning. An issue with a recumbent is that the rider has a restricted ability to lean to compensate for a cambered road. One option is to put the recumbent's seat on a flexible or pivoting base so that the rider can lean.
Putting a pivot point for the frame on a piece in the rear dropout is clever. The twin rear wheels can then follow the angle of the road, but the rider can keep the main part of the frame upright and balanced.
Some mechanisms that with such pivots employ a section of a disk brake with its caliper to enable locking the lean angle when one is stopped.
Hope that gives useful insight. Best of luck with your experimentation. There must be a simple way to do it.
Will
Eric Winn
Zen MBB Master
Tim Hicks Scratch-Built Tilting Trike
Tim Hicks has a lengthy write up of his scratch-built Black Max tilting trike showing his tilting design with several close-up pictures at http://fleettrikes.com/blackmax.htm
Arnold of RaptoBike seems to be using similar but more refined and compact geometry in his RaptoTrike concept and I get the impression it is intended to be reversible, e.g. perhaps convert to tilting rear for winter and then back to single for summer. The tilting looks like fun though so I wonder if people would ever convert back...
There is a still from the RaptoTrike video starting at 0:31 that provides a better view.
http://youtu.be/GEOGr3oy3H4?hd=1&t=31s
-Eric
Tim Hicks has a lengthy write up of his scratch-built Black Max tilting trike showing his tilting design with several close-up pictures at http://fleettrikes.com/blackmax.htm
Arnold of RaptoBike seems to be using similar but more refined and compact geometry in his RaptoTrike concept and I get the impression it is intended to be reversible, e.g. perhaps convert to tilting rear for winter and then back to single for summer. The tilting looks like fun though so I wonder if people would ever convert back...
There is a still from the RaptoTrike video starting at 0:31 that provides a better view.
http://youtu.be/GEOGr3oy3H4?hd=1&t=31s
-Eric
Charles.Plager
Recumbent Quant
Here's a link to a french
Here's a link to a french forum that talks about a moquito velomobile. It is a FWD trike (although it is not a MBB because the steering/leaning is done with the rear wheels). Quite cool.
Here's a link to a french forum that talks about a moquito velomobile. It is a FWD trike (although it is not a MBB because the steering/leaning is done with the rear wheels). Quite cool.
John Tolhurst
Zen MBB Master
Oh, the old
Oh, the old steering-is-proportional-to-lean assumption.
At high speed, a little steering give you a lot of sideways force and ... oops ... you don't have enough lean to compensate ..... ah!!! HIGH SIDE LAUNCH!!!
Oh, the old steering-is-proportional-to-lean assumption.
At high speed, a little steering give you a lot of sideways force and ... oops ... you don't have enough lean to compensate ..... ah!!! HIGH SIDE LAUNCH!!!
Offset Rear wheels?
I just stumbled across this thread & recently I have just been looking at something that might fit.
One thought, FWD could also mean Python.
Here is a simple but a little unothodox solution for a tilting FWD trike. Once you get past the idea that the rear wheel have to be across from each other, it is pretty interesting idea.
I just stumbled across this thread & recently I have just been looking at something that might fit.
One thought, FWD could also mean Python.
Here is a simple but a little unothodox solution for a tilting FWD trike. Once you get past the idea that the rear wheel have to be across from each other, it is pretty interesting idea.
Charles.Plager
Recumbent Quant
You're right. That is both
You're right. That is both weird and cool.
You're right. That is both weird and cool.
will_rifkin
New Member
worth doing the same on a Cruzbike
Thanks, Shakey, for identifying that iLean approach. I had just thought up the same thing and experimented on some flimsy components.
I have installed a bottom bracket in my conversion bike where the old bottom bracket used to go. Now, I need to find a crankset on which to mount the 'outrigger' wheels. The additional wheels could be a full 26 inches in diameter, with the crank arms 180 degrees apart or smaller wheels (about 18 inches) with the crank arms 90 degrees apart.
I can try it first with the current rear wheel in place, and then I can remove the rear wheel. The crank arms should be plenty strong enough to take the loads.
If I leave the front chainwheel in place on this extra crank, then I can use that as a locking mechanism when I come to a stop. I can mount a front derailleur lower than normal, to a point where it interferes with the sprocket teeth when the derailleur is in the down position. That will prevent the chainwheel from rotating, which prevents the crank arms from shifting up or down, meaning that the bike will not be able to lean side to side.
Plan B is to use drum or disk brakes on the outrigger wheels. When at a stop, the bike can lean only if the outrigger wheels roll slightly forward or back (though I will have to test this one in practice).
What makes it all so easy to do is that the Cruzbike has an empty spot for mounting the bottom bracket. I have spent the last year trying to figure out how to take advantage of this heavy-duty pivot point ...
Thanks, Shakey, for identifying that iLean approach. I had just thought up the same thing and experimented on some flimsy components.
I have installed a bottom bracket in my conversion bike where the old bottom bracket used to go. Now, I need to find a crankset on which to mount the 'outrigger' wheels. The additional wheels could be a full 26 inches in diameter, with the crank arms 180 degrees apart or smaller wheels (about 18 inches) with the crank arms 90 degrees apart.
I can try it first with the current rear wheel in place, and then I can remove the rear wheel. The crank arms should be plenty strong enough to take the loads.
If I leave the front chainwheel in place on this extra crank, then I can use that as a locking mechanism when I come to a stop. I can mount a front derailleur lower than normal, to a point where it interferes with the sprocket teeth when the derailleur is in the down position. That will prevent the chainwheel from rotating, which prevents the crank arms from shifting up or down, meaning that the bike will not be able to lean side to side.
Plan B is to use drum or disk brakes on the outrigger wheels. When at a stop, the bike can lean only if the outrigger wheels roll slightly forward or back (though I will have to test this one in practice).
What makes it all so easy to do is that the Cruzbike has an empty spot for mounting the bottom bracket. I have spent the last year trying to figure out how to take advantage of this heavy-duty pivot point ...
Mark Amey_2
New Member
There is no shortage of
There is no shortage of leaning trikes:
http://www.tripod-bikes.com/?lang=2
or this:
http://www.mjmmobile.com/
OK, the latter doesn't lean, it's just fun.
Velocologne do a leaning FWD MBB trike which leans by eing disarticulated in the middle of the frame.
There is no shortage of leaning trikes:
http://www.tripod-bikes.com/?lang=2
or this:
http://www.mjmmobile.com/
OK, the latter doesn't lean, it's just fun.
Velocologne do a leaning FWD MBB trike which leans by eing disarticulated in the middle of the frame.
Universal Joint
I am considering building a FWD MBB Delta Trike and found this thread interesting. I was wondering if something like a universal joint where the main tube meets the rear axle would work instead of tilting wheels. If side to side swivel is all that's needed could you use a head tube on the back. I don't know if either of these would work but got the idea seeing a car pull a trailer. The trailer tracked fine with no tilt.
Any thoughts would be appreciated.
I am considering building a FWD MBB Delta Trike and found this thread interesting. I was wondering if something like a universal joint where the main tube meets the rear axle would work instead of tilting wheels. If side to side swivel is all that's needed could you use a head tube on the back. I don't know if either of these would work but got the idea seeing a car pull a trailer. The trailer tracked fine with no tilt.
Any thoughts would be appreciated.
