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Old 03-06-2012, 02:42 AM   #31 (permalink)
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The Aptera shape developed by Alberto Morelli lends itself to a recumbent bike.

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Old 03-06-2012, 07:31 AM   #32 (permalink)
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Quote:
Originally Posted by Grant-53 View Post
The Aptera shape developed by Alberto Morelli lends itself to a recumbent bike.
Maybe if you rotated it 90 degrees so the tail was vertical.
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Old 03-06-2012, 04:10 PM   #33 (permalink)
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Since the top and the sides can be sloped at about the same angle, a vertical fish tail would be shorter and / or have lower drag than a horizontal beaver tail. So for a reverse trike, the former would be better. Also look at the Quest velomobile for an amazing model of a low drag chassis.
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Old 03-06-2012, 11:04 PM   #34 (permalink)
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Quest is an excellent shape. One can weigh the advantages once given the CG. Downforce can be better than fin area for stability in yaw.
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Old 03-07-2012, 02:36 AM   #35 (permalink)
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You guys are so far ahead of me lol, I've only given the vaguest of considerations to the thought of a velomobile conversion as of yet & TBH, I've been coming up with more problems than solutions, like difficulty in getting in/out of the thing, overall length & ofc cost/construction.

Please don't take me wrong though - your discussion & suggestions are greatly appreciated and valued! I really do like the Quest shape for example, it's just even best case scenario it won't be till next winter that I can realistically consider taking on a project like that, even then I suspect I'll need some redesign & modification - though I'm really hoping I'll get most of that sorted this summer.

For now I'm still in the midst of the admittedly boring wiring & control configuration, which has been going slowly for a coupla reasons, mostly because I'd like to get it right the first time - but I've also had to divide my attention, my other bikes have become jealous lol so I'm building a new motor for the '43 Rollfast & just trying to keep my poor winter beater Schwinn in one piece... with over 10,000 miles on a POS box store bike, that's becoming interesting, perhaps even an exercise in futility heh

Still, there's been some progress to report - I finally figured out how/where to mount the taillight/brake light/blinker unit (very pleased w/it's astounding brightness), upholstered the breaker panel & mounted it (though it still lacks the needed heat shield), but probably the most time consuming yet least interesting was making the lighting and accessories wiring schematic, which once it's finalized with however many corrections/revisions/additions it needs - will be printed on sticker stock & stuck... somewhere under the seat so I don't loose the silly thing

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Old 03-07-2012, 07:44 AM   #36 (permalink)
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Quote:
Originally Posted by Grant-53 View Post
Quest is an excellent shape. One can weigh the advantages once given the CG. Downforce can be better than fin area for stability in yaw.
Down force? What is the top speed of the bike? 35 mph?
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Old 05-08-2012, 08:28 AM   #37 (permalink)
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original trike?

What is the original trike maker and model? I have not come across one that looks like what you are using. The closest is the HP Velotechnik Scorpion FS:

HP Velotechnik - Products - Scorpion fs foldable trike
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Old 05-09-2012, 04:57 AM   #38 (permalink)
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The original trike maker and model would be... me... mostly

Sorry for the confusion, I should have made it clearer that it's a completely custom build save for the repurposing of w/e commonly available parts I could manage, to facilitate maintenance & repair - such as the front A arms, which are chopped & lightened Yerf-Dog gokart components (a touch overkill, but inexpensive). There's better A arms out there BTW, I used the Yerf-Dog's simply because they'd had a spindle recall and there was a glut on the market, the entire front suspension assembly could be had for pennies on the dollar, perfect for experimentation.

While I initially planned on making my own frame as well, during the mockup stage I realized I could save quite a bit of headache time by utilizing a preexisting subframe, one already made to fit the motor's mounts etc. While heavier than optimum I took a destroyed 50cc four wheeler's chassis and chopped, dropped & raked it to fit my application and redid all the welds (they were really bad). With only an estimated 40% of just the original subframe remaining, it's far lighter than I feared it would be. If it all turns out well, I may just replicate it's frame with a lighter material, but if you're considering a scratch-build with a horizontal four stroke, I'd recommend just buying a new kiddie-sized ATV to start with as it costs almost the same as the engine alone - but comes with the harness, switches, motor mounts & more. Provided it's a recognizable/reputable engine brand (like Lifan), that's far more sensible then the hunt & scratch I did lol

The rear chainstays & the pedal tube are "recycled" steel mountain bike bits... I think the cheesy 'NEXT' brand TBH, but I really liked the dropout design & I've redone the welds on those too for safety concerns. I've built/rebuilt everything else I can think of, save the seat (didn't wanna bother w/fiberglass layups lol) and the wheelset - which I had custom made for this application by a wheelbuilder friend of mine...


While I would have greatly preferred just motorizing a preexisting taddy, when I started planning this build (daydream stage), there simply wasn't any commercial fully suspended tadpoles available that were even remotely suitable... actually at the time there was only one or two companies that even made them at all that I could find - ones that had true dual A arms anyway, like the Berserker. Of the ones I could find they were... extremely cost prohibitive for the gawdawful abomineering & experimentation I had in mind.

While cost may be less a concern for others, I've found that recumbents & recumbent parts in general carry a substantial surcharge just for the sake that they're recumbents... brakes, spindles, wheelsets - w/e it may be it seems they want three or four times as much than their upright equivalents, regardless of application, quality or brand. Even unsuspended, unmotorized tadpole recumbents often cost almost as much or even more than I've got in this entire project, engines included - which is 2500 bucks or so, roughly... it's something I try to not think about too much lol

...so with some reluctance I realized if I really wanted to do this, I was gonna hafta do it all me dang self
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Old 05-09-2012, 08:51 AM   #39 (permalink)
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Cool! That helps explain how the motors fit in so well -- you designed the frame. Awesome job.
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Old 09-27-2012, 02:35 PM   #40 (permalink)
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BarelyAwake, how is your trike coming along? I just found this thread and think your project is interesting. Have you considered using the engine as a generator for the electric hub rather than connecting it mechanically to the wheel? This could eliminate the problem of premature wear on the geared hub. Just use the engine as a range extender like the Chevy Volt does. I'm not sure how you could do it, but if you've managed to build this thing up to this point you're probably clever enough to make it happen.

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