New Mid Racer

Recumbents and all feet forward machines

Postby Freddyflatfoot » Tue Mar 17, 2009 2:17 pm

Ok, rear view and oblique. Only took 3 pics.
I think I've still got the instructions somewhere, if you're interested.
Image
Image
Cheers!
Rob
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Homebuilt trike, with electric assist
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SWB recumbent, 700C/451 , "Kookaburra", homebuilt.
FWD project (Cyclone).
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by BNA » Tue Mar 17, 2009 2:28 pm

BNA
 

Postby Kalgrm » Tue Mar 17, 2009 2:28 pm

Thanks, but I think I'll "reinvent the wheel" for my instructions. I'm a Real Man, so instructions are superfluous! ;)

How does it go? Do you notice a significant difference in reduction of wind resistance?

Cheers,
Graeme
Think outside the double triangle.
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Postby raptordesigns » Tue Mar 17, 2009 6:50 pm

Kalgrm wrote:Thanks, but I think I'll "reinvent the wheel" for my instructions. I'm a Real Man, so instructions are superfluous! ;)

How does it go? Do you notice a significant difference in reduction of wind resistance?

Cheers,
Graeme


or try this technique:
http://www.aerialpursuits.com/misc/bent_fairing.htm
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Postby geebee » Tue Mar 17, 2009 7:55 pm

Or the classic that you all probally know http://www.recumbents.com/wisil/tailbox ... ailbox.htm
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Postby Freddyflatfoot » Wed Mar 18, 2009 8:40 am

Kalgrm wrote:Thanks, but I think I'll "reinvent the wheel" for my instructions. I'm a Real Man, so instructions are superfluous! ;)

How does it go? Do you notice a significant difference in reduction of wind resistance?

Cheers,
Graeme


It did on my old bike, maybe between 3-4 kph? Should be slightly better on this bike, as the whole frontal profile is lower, and more of the wheel/rear section is now shrouded.
I rode her to work last night, and did notice a significant speed increase, easily hitting the mid 40's, in my work clothes! Headwinds are less of an issue. The one thing you really notice when using a tailbox, is that the whole bike feels more slippery, and you seem to use less effort to get where you are going. Purely subjective of course, but that's how it feels!
I'll go out and do my usual lake circuit this morning, and I'll have a better idea on how the tailbox has affected the bike.
Cheers!
Rob
---------------------------------------------------
Homebuilt trike, with electric assist
26"/20" trike, "Goanna"
SWB recumbent, 700C/451 , "Kookaburra", homebuilt.
FWD project (Cyclone).
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Postby Freddyflatfoot » Wed Mar 18, 2009 2:30 pm

Ok, went and did my usual lake circuit.
Here's the rundown of the consecutive avg.s speeds.
Ride to lake, 25 kph,
After 1st lap, 28 kph,
2nd lap, 29.0 kph,
3rd lap, 29.6 kph,
4th lap, 30.0 kph,
5th lap, 30.3 kph,
and home 30.4 kph.
Calc'd out the lake section at an avg. of 31.7 kph for 30.75 k's.
Not bad considering I was wearing baggy shorts and T shirt!
Works out at about the same as my last bike wearing lycra.
Possibly some room for improvement, a couple of the laps were a bit slower, and I just tried to maintain a consistent speed, so no sprinting or working hard. Pretty happy with these results.
Cheers!
Rob
---------------------------------------------------
Homebuilt trike, with electric assist
26"/20" trike, "Goanna"
SWB recumbent, 700C/451 , "Kookaburra", homebuilt.
FWD project (Cyclone).
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Postby Kalgrm » Wed Mar 18, 2009 5:14 pm

Thanks Rob. Did you do that ride on that bike without the tail box? If so, how did the speeds compare. (Comparing with riding your old bike wearing Lycra doesn't really tell me how much difference your tailbox makes to this bike ....)

Cheers,
Graeme
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Postby Freddyflatfoot » Wed Mar 18, 2009 6:05 pm

Graeme, have to admit, nothing measured/recorded. The few times I rode this bike around the lake without the tailbox were fairly windy, so wouldn't have given a fair figure. Only light winds today. probably why I said more subjective than anything. Bike is definitely quicker, and my 'feeling' for my lake times would be sub 30 kph, probably closer to 29.
With the tailbox though, you can really feel that the bike is moving through the air much more smoothly, and acceleration, especially past 30 kph, feels more crisp.
I was comparing it to my old bike, as that is a fair comparison (for me), of how the bike performs sans and with tailbox.
Sorry, had to mention the lycra! *Everyone* knows you are quicker wearing lycra!
I was actually trying to make a point that baggy shorts would probably not be conducive to high speed runs! And that even considering the shorts and T shirt, I was still able to turn a respectable speed (for me).
For me though, I am firmly convinced that tailboxes are probably the best and simplest aero aid that you can add to your bike/trike (, oh, and wheel discs!) Other testers have reported similar avg. speed increases that I have seen.
Cheers!
Rob
---------------------------------------------------
Homebuilt trike, with electric assist
26"/20" trike, "Goanna"
SWB recumbent, 700C/451 , "Kookaburra", homebuilt.
FWD project (Cyclone).
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