Random Aerodynamic Oddity of the Day Thread

[Bicycle Bob]

Originally Posted by beate

You can easily take off the side windows, and You can easily remove the entire canopy. And You will do that voluntarily.

And yes, the front wheel openings can and should have been improved.

On the other hand: the GoOne 3 has never been intended to be a racing machine. It is a good looking cruiser.

But no, the windshield is not a disaster for daily use. You will need a fan to keep it clean during the colder days (standard in the last production years), You might have some trouble with rain drops - but this is the same trouble as with any velomobile screen and surpisingly less than expected).
Most cumbersome is the deep sun, comparable to a car.

Velomobile screens come at many angles of incidence. The flatter they are, the harder it is to maintain adequate optical clarity if they are a 3-D curve. On all, the flatter they are, the more raindrops you have to look through, and the more trouble you have with hazing of the plastic. Using wipers causes fine scratches, especially if there is any road grit present. Under misting conditions, a fan can use over 100 Watts and still be inadequate without extensive ducting and management of exhaled air. My windshield is a lot steeper and easier to reach than the Go-One's, and I was nearly blind riding into a sunset within 1,000 km.
There's a lot to be said for just looking through the necessary air intake. Keeping your head cool matters more for comfort than body cooling.
Windshield angle is so important that the early Jaguar E types compromised their beauty and streamlining with a steeper angle.

[beate]

Originally Posted by Bicycle Bob

Under misting conditions, a fan can use over 100 Watts and still be inadequate without extensive ducting and management of exhaled air. My windshield is a lot steeper and easier to reach than the Go-One's, and I was nearly blind riding into a sunset within 1,000 km.

Well, i do not want to neglect the problems - but i own a GoOne 3 (see EcoModder Forum > AltModding > Alternative Transportation
> Beate's old Go-One 3), i just came from a nightly ride where the fan (which indeed operates thouroughly ducted - the manufacturer had finally found a surprisingly good solution, and i am currently exploring its limitations) was at its limits a few times - but i could go faster than 30 kph most of the time.

Even in rain i usually do not need a wiper - and i did not have applied rainX to the screen. But i carry one with me in order to be able to stop and clear the screen if everything fails. So up to now, over a total of 4700 km, it is not optimal, but usable under most conditions. For me it is mostly a fun vehicle and a replacement for a race bike, but there are still a few people in Germany who use their GoOnes for daily commute.

[freebeard]

The flatter they are, the harder it is to maintain adequate optical clarity if they are a 3-D curve.

Fresnel Effect rules all. en.wikipedia.org/wiki/Fresnel_equations

Windshield angle is so important that the early Jaguar E types compromised their beauty and streamlining with a steeper angle.

VW Type I as well.

[beate]

Originally Posted by freebeard

Fresnel Effect rules all.

That's why i still avoid polishing the mostly small scratches in the screen: any tiny irregularity from uneven polishing might make things even worse. But despite of that: seeing through the screen is still ok in most situations, at least as long as the screen is sufficiently clean.

[redneck]

Originally Posted by freebeard

I like their C-cab truck.




Now that's a kubelwagen. But I still don't know what that is on the tiller. Air horn? Dashcam?

Possibly a 2 stroke engine.

If so, it may be a early attempt at a expansion chamber type exhaust.


🤷

>

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[cRiPpLe_rOoStEr]

That engine doesn't really look like a 2-stroke. It appears to have valve stems.

[redneck]

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My bad ��.

Was looking at the one in the quote with the funnel like object attached to the fork.

The green one does look to have external push rods. So yes, 4 stroke.

The thing on the tiller (handle bar) might be some sort of acetylene or carbide tank for a headlamp.


>

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[cRiPpLe_rOoStEr]

Originally Posted by redneck

The thing on the tiller (handle bar) might be some sort of acetylene or carbide tank for a headlamp.

Most likely.

[beate]

Originally Posted by Bicycle Bob

Under misting conditions, a fan can use over 100 Watts and still be inadequate without extensive ducting and management of exhaled air.

Just for the record the solution developed and tested by the vendor. Standard in the last two production years of the bike (that's my bike, but from an old selling offer from 2010):

[freebeard]

Hard to rate without a cross-section. A bellmouth might help.

A one-time contributor here, graysgarage, went on to designing the intake snorkels for the Lucid Air air conditioning condensers (or something).

Given an overheated occupant, perhaps there is an opportunity for Meredith Effect.