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Forum: Forum News & Feedback 11-20-2018, 09:54 AM
Replies: 11
Views: 2,808
Posted By MetroMPG
Lots of members here have a strong interest in...

Lots of members here have a strong interest in human powered transportation (myself included - most of my local kilometers are by bike).

But I'm not a big fan of subdividing existing subforums...
Forum: Motorcycles / Scooters 10-14-2017, 03:42 PM
Replies: 38
Views: 10,150
Posted By Grant-53
Dipping into one of my text books, Mechanical...

Dipping into one of my text books, Mechanical Engineering Design 5th Ed. Shigley and Mischke, we find V belt efficiency ranges from 70 to 96%. A notched V belt is different from timing belt system...
Forum: Motorcycles / Scooters 08-12-2014, 06:34 AM
Replies: 62
Views: 16,404
Posted By gregsfc
I think it's great to see you or anyone else...

I think it's great to see you or anyone else seriously interested enough in streamlining to build something totally new; incorporating some of the ideas and concepts promoted by Craig Vetter and the...
Forum: Motorcycles / Scooters 01-09-2014, 06:56 PM
Replies: 8
Views: 2,991
Posted By beatr911
100,000 miles at $3.50/gallon getting 70mpg is...

100,000 miles at $3.50/gallon getting 70mpg is $5,000. The cost to fuel the electric bike would be about $1200, on my local rate.

I'm not going to try to pretend to assume all the costs of a...
Forum: Motorcycles / Scooters 01-09-2014, 06:33 PM
Replies: 179
Views: 73,541
Posted By Ironside
Recumbent Honda 90

I've had a couple of requests to start a new thread, so here goes.

First a little history :-

I've been riding motorbikes since the late 60's, everything from mopeds to 1000cc 'superbikes'. It...
Forum: Motorcycles / Scooters 01-29-2013, 11:55 AM
Replies: 7
Views: 2,081
Posted By botsapper
Retro-aero - DecoPod

Enjoying another metal masterpiece from Randy Grubb, DecoPod.

http://www.youtube.com/watch?v=OuvdjiL_G5o

Modern Vespa : Deco Pod Scooter (http://modernvespa.com/forum/topic109610)
Forum: Motorcycles / Scooters 12-06-2012, 07:11 AM
Replies: 23
Views: 6,894
Posted By MisterInnovation
The boxfish shape is also very streamlined....

The boxfish shape is also very streamlined. However I cannot for the life of me find a 3d model of one.
Forum: Motorcycles / Scooters 12-06-2012, 04:35 AM
Replies: 23
Views: 6,894
Posted By Cd
Correct me if i'm wrong, but the reason that jets...

Correct me if i'm wrong, but the reason that jets and rockets don't look so much like a teardrop at the rear is also because this is where the exhaust gasses come out, and therefore there is no need...
Forum: Motorcycles / Scooters 12-06-2012, 01:53 AM
Replies: 23
Views: 6,894
Posted By Frank Lee
Re: pointy: keep in mind there are several TYPES...

Re: pointy: keep in mind there are several TYPES of aero drag; for example a super sleek pointy shape might have lower FORM drag than a teardrop but because of the increase in surface area- if the...
Forum: Motorcycles / Scooters 12-05-2012, 10:14 PM
Replies: 23
Views: 6,894
Posted By bschloop
the best way to understand is to do. find or make...

the best way to understand is to do. find or make a wind tunnel and try all the shapes you can think of at normal vehicle windspeeds. when a vehicle is designed this is what is done.

also, most...
Forum: Motorcycles / Scooters 12-05-2012, 10:06 PM
Replies: 23
Views: 6,894
Posted By NeilBlanchard
Pointy nose helps at very fast speeds, but a...

Pointy nose helps at very fast speeds, but a blunt nose is better at speeds below 250mph. The reason as I understand it, is what I wrote in the post above.
Forum: Motorcycles / Scooters 12-05-2012, 08:55 PM
Replies: 23
Views: 6,894
Posted By HydroJim
I too don't quite understand why a teardrop is...

I too don't quite understand why a teardrop is most optimal. it seems to me that a shape like the image I've attached would be most ideal.
Forum: Motorcycles / Scooters 12-05-2012, 05:44 PM
Replies: 23
Views: 6,894
Posted By sheepdog 44
Yes, but is the rounded nose of a teardrop the...

Yes, but is the rounded nose of a teardrop the ideal shape? Water has surface tension, which among other reasons means it won't ever develop a pointy nose. Is there something about a rounded nose...
Forum: Motorcycles / Scooters 12-05-2012, 05:14 PM
Replies: 23
Views: 6,894
Posted By Grant-53
Yes, I do but I learned fluid mechanics in...

Yes, I do but I learned fluid mechanics in college not high school. A great book for ecomodders is "The Leading Edge" by Goro Tamai. This is mainly about the aerodynamics of solar racers but is...
Forum: Motorcycles / Scooters 12-05-2012, 10:30 AM
Replies: 23
Views: 6,894
Posted By Joeggernaut
Fluid dynamics is probably the least understood...

Fluid dynamics is probably the least understood science of them all. There are a few laws (mostly all related to conservation of energy) but there is not one law that can lead to the optimal solution...
Forum: Motorcycles / Scooters 12-05-2012, 10:23 AM
Replies: 23
Views: 6,894
Posted By Frank Lee
the teardrop isn't the best in all situations,...

the teardrop isn't the best in all situations, yet it is a good way to think about air flow management. one of the big issues for us landlubbers is ground effect, which basically makes 1/2 a teardrop...
Forum: Motorcycles / Scooters 12-05-2012, 10:22 AM
Replies: 23
Views: 6,894
Posted By NeilBlanchard
Aerodynamic drag below ~250mph is different that...

Aerodynamic drag below ~250mph is different that speeds up to ~750mpg (around the speed of sound). There are three kinds of drag (as I understand it): shape drag, surface drag, and detail drag. ...
Showing results 1 to 17 of 17

 
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