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Old 08-14-2011, 07:56 PM   #11 (permalink)
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I would suggest just working with that three view and making a hand sized version by cutting it out of some modeling material, foam/clay/balsa block/whatev, then smooth it out on the corners and see what it looks like in 3d. The proportions don't look too awful, and you can test it in a vacuum cleaner powered air tunnel

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Old 08-14-2011, 08:37 PM   #12 (permalink)
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Now there's a good idea !
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Old 08-14-2011, 10:51 PM   #13 (permalink)
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Could any of you experienced fellas hazard a guess as to the drag coefficient of what I've drawn ?

I really have no idea but I've been plugging .45 into the calculator. Am I being overly optimistic ?
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Old 08-15-2011, 11:56 PM   #14 (permalink)
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I think you'd find such close proximity of windshield edge and throat to be both uncomfortable and hazardous.

Also I think you'll want more length aft of the rider, for possibly storage and for aero.

You will want a good seat more than you want to be lower for aero. If it's uncomfortable you won't ride it... perhaps the best fuel saving technique of all???

Noises are much amplified inside aeroshells. Prepare for a very noisy interior or special noise mitigation efforts.

I know Allert did it, but personally I'm opposed to adding what is essentially ballast for stabilization. I'd rather try to jockey the weight that needs to be there around to where it does the most good.
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Old 08-16-2011, 04:11 AM   #15 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
I think you'd find such close proximity of windshield edge and throat to be both uncomfortable and hazardous.

Also I think you'll want more length aft of the rider, for possibly storage and for aero.
Agreed , I've drawn an extra 6 inches on the rear top which gives a overhang of about 3 inches .
You will want a good seat more than you want to be lower for aero. If it's uncomfortable you won't ride it... perhaps the best fuel saving technique of all???
Indeed !
Noises are much amplified inside aeroshells. Prepare for a very noisy interior or special noise mitigation efforts.
Yes ,this is something of a concern .I'm planning a separate sound insulated cowling inside the fairing but an aircooled diesel is a very noisy animal and I may not be able to fix it .

I know Allert did it, but personally I'm opposed to adding what is essentially ballast for stabilization. I'd rather try to jockey the weight that needs to be there around to where it does the most good.

Could you say why ? I'm very interested
I'll build a model of the fairing and see how it performs but the concerns you raise are real especially the internal noise .If I don't do the fairing it will be for the noise .

Just using 10 hp diesel would still give a 36% improvement with the added advantage of being able to use biodiesel for a very low carbon footprint .

Frank ,could you suggest a Cd for the fairing ?

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Old 08-16-2011, 06:58 AM   #16 (permalink)
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We know that a heavier weight vehicle doesn't suffer reduced fe all that much on the highway, but it does hurt in the stop-n-go, and it makes the go slower. The little diesel is pretty slow in the go dept. already so I'd be after adding lightness. If I found that, say, a more forward Cg is desired I'd look at relocating already heavier stuff like the fuel tank or battery instead of making something heavier than need be.

I forgot what Allert figures his bike's Cd is? Pretty much copy that, and pretty much get that Cd.
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Old 08-16-2011, 07:27 AM   #17 (permalink)
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Thanks Frank , I have no idea of Allert's cD but I suppose I could try to derive it using the calculator .Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com
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Old 08-16-2011, 07:42 AM   #18 (permalink)
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.3 sounds likely for Allert if it has 5.5 squ ft frontal area.
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Old 08-17-2011, 08:09 PM   #19 (permalink)
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Quote:
Originally Posted by PeterS View Post
Where do I find the aero template ?
http://ecomodder.com/forum/showthrea...rt-c-9287.html

You can cut it off at the wanted length - beyond 70% the gains are minimal anyway.

Quote:
I've drawn that with a thin seat right down on the frame ,my State is very strict about frame mods
In that case, you'll have to live with the resulting height.
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Old 08-18-2011, 03:21 AM   #20 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
I think you'd find such close proximity of windshield edge and throat to be both uncomfortable and hazardous.
.
.
I just noted this comment Frank .You're right and as I'd actually be looking out over the top of the screen I think I'd modify it to have a wide vertical edge and padding .

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