Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Recumbent What IS that thing?! Recumbents may be odd looking, but they have many advantages over a "wedgie" bicycle. Discuss the in's and out's recumbent lifestyle in the recumbent forum.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-03-07, 08:39 AM   #1
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Double decker tandem recumbent?

I posted this as part of another thread, but since it's a separate subject in itself, hope to get more responses as a separate thread.

One idea I had that I haven't seen anywhere: A recumbent tandem trike designed so that the passenger seat is above the driver's seat, rather than behind it. A double-decker tandem, in other words. That would have a smaller footprint, and also, if the driver was riding solo, the top seat could be adapted (with foldouts or by other means) to be a roof to protect from rain and sun and/or to carry cargo. Also, the vehicle would be high, which solves the problem of recumbents being too low to be seen by other drivers.

I have no idea if this is workable or not, I hope people here will tell me if it could work.

One person already pointed out two possible shortcomings: a high center of gravity making turns less stable, and the top rider dripping sweat onto the bottom rider. These don't seem like necessarily insurmountable problems to me, so would love to hear more opinions/ideas. Also, a link if you've actually seen a double decker recumbent on the net.
beelz is offline   Reply With Quote
Old 10-03-07, 09:12 AM   #2
cat0020
Ride more, eat less
 
cat0020's Avatar
 
Join Date: Feb 2007
Location: NW Philla, Hoboken NJ, Jamaica/Brooklyn NY
Bikes: Too many but never enough.
Posts: 558
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
What do you think of this one:



Stoker sit in front of the captn, full view of vision for both riders..
cat0020 is offline   Reply With Quote
Old 10-03-07, 09:37 AM   #3
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yeah, but it's criminal to make your passenger sit on a wedgie!
beelz is offline   Reply With Quote
Old 10-03-07, 10:24 AM   #4
cat0020
Ride more, eat less
 
cat0020's Avatar
 
Join Date: Feb 2007
Location: NW Philla, Hoboken NJ, Jamaica/Brooklyn NY
Bikes: Too many but never enough.
Posts: 558
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Actually, the passenger sit in front of the captn, who sits upright and control the tandem from behind the stoker.
cat0020 is offline   Reply With Quote
Old 10-03-07, 10:42 AM   #5
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
Posts: 8,944
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Double-decker tandem: How would the stoker climb aboard? Severe balance issues, as well as stability issues when braking or climbing. A double-decker would be extremely dangerous to ride!

The half-recumbent tandem is a Taiwanese version of the venerable Bilenky Viewpoint tandem, which is itself base on the older Opus III Counterpoint tandem.
BlazingPedals is offline   Reply With Quote
Old 10-03-07, 11:02 AM   #6
jeff-o
Recumbent Evangelist
 
Join Date: Mar 2005
Location: Kitchener, Ontario
Bikes: Rebel Cycles Trike, Trek 7500FX
Posts: 2,991
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BlazingPedals View Post
Double-decker tandem: How would the stoker climb aboard? Severe balance issues, as well as stability issues when braking or climbing. A double-decker would be extremely dangerous to ride!
+1.

It would have to be incredibly wide to counteract the balance issues while turning. A trike like this could only be a novelty item during parades.
jeff-o is offline   Reply With Quote
Old 10-03-07, 11:11 AM   #7
vik 
cyclopath
 
vik's Avatar
 
Join Date: Apr 2006
Location: Victoria, BC
Bikes: Surly Krampus, Surly Straggler, Pivot Mach 6, Bike Friday Tikit, Bike Friday Tandem, Santa Cruz Nomad
Posts: 5,265
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jeff-o View Post
+1.

It would have to be incredibly wide to counteract the balance issues while turning. A trike like this could only be a novelty item during parades.
+1 you wouldn't make it around the first corner upright...
__________________
safe riding - Vik
VikApproved
vik is offline   Reply With Quote
Old 10-03-07, 12:53 PM   #8
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
Posts: 8,944
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
I wasn't even thinking in terms of side-to-side balance. With the center of gravity up that high, you'd have to have a long wheelbase or else gentle braking would tend to make the bike do an endo. Likewise, going up a steep climb, the bike would spontaneously tip over backwards. Giving it a longer wheelbase to fix the problem would put you right back where you started wrt having a small footprint, but with the disadvantage of how the stoker is expected to climb up to the 2nd floor seat.
BlazingPedals is offline   Reply With Quote
Old 10-06-07, 08:34 AM   #9
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Look, it's simple. The upper rider simply steps on the stomach of the lower rider and the lower rider then raises his knees so the upper rider can then step on his knees to get up to his or her seat. You think I didn't think of everything?

As for the high center of balance...does it have to be that high? What about making the upper seat just as high as it needs to be in order to give the lower rider room for his reclined body and his pedaling motion, and no higher. Would that really be too high? I can't really picture it, so I'm just asking. Seems to me that you wouldn't need that much room.
beelz is offline   Reply With Quote
Old 10-06-07, 08:36 AM   #10
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Actually, why couldn't the upper rider board the vehicle first, using the lower seat as a stepladder to get up to the upper seat? Then the lower rider boards.

You could also have some kind of lightweight ladder. Ladders can even be made of rope, can't they?
beelz is offline   Reply With Quote
Old 10-06-07, 09:04 AM   #11
Floyd
el padre
 
Join Date: Mar 2005
Location: South East Kansas
Bikes: Rans Stratus, ICE TRike, other assorted
Posts: 1,500
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
If you are talking 2-wheeler the balance issues are compounded...top rider leaning one way, bottom another... +1 on the possible, and that is only possible circus ride or in a parade.
peace
Floyd is offline   Reply With Quote
Old 10-06-07, 02:07 PM   #12
rohorn
bling intolerant
 
Join Date: May 2006
Location: Denver Metro
Bikes: Homebuilts!
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It seems nobody remembers (or ever saw) this one:

rohorn is offline   Reply With Quote
Old 10-07-07, 08:35 AM   #13
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rohorn, where did you find that cartoon??? But that's much higher than it needs to be.
beelz is offline   Reply With Quote
Old 10-07-07, 08:37 AM   #14
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Imagine a really low recumbent trike. Then add a second deck to it, but only high enough to clear the lower rider's leg rotation. Would that need to be any higher than maybe 4 feet high? That's not that high, is it?

Remember it's a trike, not a bike...

also maybe with smaller wheels it can get lower.
beelz is offline   Reply With Quote
Old 10-07-07, 11:27 AM   #15
lee_rimar
Senior Member
 
Join Date: Jan 2007
Bikes:
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well, I see these aroun Portland sometimes...

http://en.wikipedia.org/wiki/Tall_bike

---

---
So tall isn't necessarily impossible (even tough I've never seen how someone mounts/dismounts a tall bike). But you'd only have to make it a little taller & longer to leave room to stack more than one rider...
lee_rimar is offline   Reply With Quote
Old 10-07-07, 02:18 PM   #16
vik 
cyclopath
 
vik's Avatar
 
Join Date: Apr 2006
Location: Victoria, BC
Bikes: Surly Krampus, Surly Straggler, Pivot Mach 6, Bike Friday Tikit, Bike Friday Tandem, Santa Cruz Nomad
Posts: 5,265
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by beelz View Post
Imagine a really low recumbent trike. Then add a second deck to it, but only high enough to clear the lower rider's leg rotation. Would that need to be any higher than maybe 4 feet high? That's not that high, is it?

Remember it's a trike, not a bike...

also maybe with smaller wheels it can get lower.
A trike is much worse for a vertical tandem than a 2 wheeled bent. A high two wheeled bent can lean in corners where a vertical tandem trike will just fall over.

This is why 2 wheeled "tall bikes" like the one pictured above are ridable.
__________________
safe riding - Vik
VikApproved
vik is offline   Reply With Quote
Old 10-07-07, 09:54 PM   #17
rohorn
bling intolerant
 
Join Date: May 2006
Location: Denver Metro
Bikes: Homebuilts!
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by beelz View Post
Rohorn, where did you find that cartoon??? But that's much higher than it needs to be.

http://recumbent.com

I first saw it in RCN around 8 years ago.
rohorn is offline   Reply With Quote
Old 10-08-07, 10:58 AM   #18
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
Posts: 8,944
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Quote:
Originally Posted by rohorn View Post


Rohorn, where did you find that cartoon??? But that's much higher than it needs to be.
What is too tall about it? Do you expect to obscure the lower rider's view? I don't think you've completely thought everything through, especially starting and stopping. If the top rider mounts first, the other rider must hold the bike. It would be almost assured that the bike would tip away from the holder, ensuring the top rider would fall before getting started. If the top rider got in the top seat, the lower rider would then need to roll the bike and get in while the bike was rolling (without upsetting the bike) - a hopeless task. Making the lower rider power and/or balance the thing while the top rider climbs and mounts would be similarly tricky. The only conclusion I could make is that it would be impossible to get it safely started or stopped without bracing against a tall ladder.
BlazingPedals is offline   Reply With Quote
Old 10-08-07, 11:32 AM   #19
StephenH
Uber Goober
 
StephenH's Avatar
 
Join Date: Sep 2007
Location: Dallas area, Texas
Bikes:
Posts: 11,286
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
One of my brainstorms is the 2-story backpacking tent, and I've had problems working the details out there as well.

On mounting the bike above...put a rubber tire around the upper sprocket, maybe 16" tire or so. Fix the seats back a little further. Tip it over frontwards with the guys standing, and get started like that. Then on 3, they do a wheelie and flip it to the back wheel and off they go.
StephenH is offline   Reply With Quote
Old 10-12-07, 09:31 AM   #20
beelz
Senior Member
Thread Starter
 
Join Date: Jun 2007
Bikes:
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BlazingPedals View Post
What is too tall about it? Do you expect to obscure the lower rider's view? I don't think you've completely thought everything through, especially starting and stopping. If the top rider mounts first, the other rider must hold the bike. It would be almost assured that the bike would tip away from the holder, ensuring the top rider would fall before getting started. If the top rider got in the top seat, the lower rider would then need to roll the bike and get in while the bike was rolling (without upsetting the bike) - a hopeless task. Making the lower rider power and/or balance the thing while the top rider climbs and mounts would be similarly tricky. The only conclusion I could make is that it would be impossible to get it safely started or stopped without bracing against a tall ladder.
Um, it's a TRIKE, are you aware of that? Not 2 wheels, 3. Do your criticisms still apply?
beelz is offline   Reply With Quote
Old 10-14-07, 07:54 PM   #21
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
Posts: 8,944
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
For a trike you could build a ladder into the frame (more weight, but who cares?!!) Stability would depend on how big the base triangle was, but the bottom rider would probably have to mount first in any case. Trikes get most of their stability by having the weight down low, so a two-story trike of normal track and wheelbase would be very susceptible to tipping over in turns, and maybe even in a straight line if the road had enough of a crown.
BlazingPedals is offline   Reply With Quote
Old 10-14-07, 07:55 PM   #22
mtnbk3000
Senior Member
 
mtnbk3000's Avatar
 
Join Date: May 2007
Bikes:
Posts: 1,072
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by lee_rimar View Post
Well, I see these aroun Portland sometimes...

http://en.wikipedia.org/wiki/Tall_bike

---

---
So tall isn't necessarily impossible (even tough I've never seen how someone mounts/dismounts a tall bike). But you'd only have to make it a little taller & longer to leave room to stack more than one rider...
the time i rode one i was next to a pile of logs and just hopped on
mtnbk3000 is offline   Reply With Quote
Old 10-29-07, 06:26 AM   #23
pengyou
Senior Member
 
Join Date: Jun 2007
Bikes:
Posts: 316
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
The main reason why 'bents are so effecient is that they have such a low profile. If you have a 2 story bent, now matter how you work out balance or other issues you will have more wind resistant than a normal wedgie...so what's the point? Unless...you want to have a pretty girl ride upstairs...but we won't go there
pengyou is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 01:10 PM.