Tesi clone built in a Durham shed

[mangocrazy]

Full story here:

https://www.bikeexif.com/hub-center-steering-motorcycle











Exhaustive build details and lots more pics here:


https://www.apriliaforum.com/forums/sho ... e-Hub-Bike

[KungFooBob]

Interesting location for the radiators!

[Sadlonelygit]

As a 1D was the first Tamiya bike kit I ever built, always had a soft spot for them.
And that is a bit spesh innit!

[mangocrazy]

Interesting location for the radiators!

I've heard from more than one source that placing a radiator 'side on' to the airflow works at least as well as the 'head on' approach more universally favoured. Didn't the Britten have its radiator under the seat?

[KungFooBob]

The Benelli Tre had rads under the seat, the Varadero, Firestorm had them sideways and I think the first 800 VFR.

[Sadlonelygit]

Interesting location for the radiators!

I've heard from more than one source that placing a radiator 'side on' to the airflow works at least as well as the 'head on' approach more universally favoured. Didn't the Britten have its radiator under the seat?

It depends on how the air is channeled through the rad.
If it flows over it, then not very efficient, if it's pumped through, then all is well.
I think it was Henri Durond who insisted on changing the orientation of the rads in one of the McLaren race cars, and fairly swiftly had to change it back again as it overheated.

[Skub]

Very cool. That's some angle for the end can!

[Taipan]

Hideous!!

[ChrisW]

Seriously impressive 'shed' build, I hope it rides as well as he hoped it would!

[Mr. Dazzle]

VFRs and VTRs of various flavours all have side mounted twin radiators don't they. I think the air goes into the front of the fairing and then out sideways through the rads. Which it also does on "normal" bikes when you think about it, the sequence of bits is just a bit different.

F1 cars have em at all kinds of funny angles, but they also have ducts to direct the air through em, soooo....

Regarding the OP...tis a sensible place to have em in a lot of ways. They're down low and they're below the hot engine.

[mangocrazy]

This is what Kevin Cameron had to say about the Britten and the way its radiators were configured:

Aircraft experience teaches that it costs more power to push air through a resistive radiator core than to flow that same air over the smooth outside of the machine. For lowest drag, then, radiator airflow must be reduced to the least possible. Bike radiators in the conventional position-between the front tire and the engine-work poorly because it’s difficult to eject the heated air into a low-pressure area. Bruteforce methods are used to compensate for this problem; radiators are simply made very large, fed by very large openings. This makes recent racebikes resemble clumsily faired, square-rigged ships. Drag is high.

Britten didn’t want that. So, he located a very small cooler (about 5 by 14 inches) under the rider’s seat, and forced air through it by taking air in at the highest-pressure zone (the front of the fairing) and ducting it back out into the lowestpressure zone (the wake region behind the bike). With this maximum pressure difference across it, supplied through smooth ducting, the horizontal radiator gets adequate airflow at low power cost. Despite its small size, it holds the 1 lOOcc engine at 80 degrees Celcius, or 176 degrees Fahrenheit.

[Mr. Dazzle]

There's even a term for it. "Cooling drag".

S'why F1 cars have incredibly fancy radiators and why EVs have the "sealed up bar of soap" look. Don't need so much cooling, so don't need the drag!

Then have a look at the Meredith effect

[MrLongbeard]

I like it, but did someone delete the last couple of lines from the CNC code for the final finishing passes

[Mr. Dazzle]

I wouldn't pay someone to spend ages doing final fine cuts if it was a shed project either.

I mean...well, I would, but only because those sharp step overs make loads of potential crack initiators.

I wouldn't do it for aesthetic reasons!

[Cousin Jack]

All it wants now is some clothes.

[Count Steer]

I wouldn't pay someone to spend ages doing final fine cuts if it was a shed project either.

I mean...well, I would, but only because those sharp step overs make loads of potential crack initiators.

I wouldn't do it for aesthetic reasons!

He didn't pay anyone for the original cuts either...he converted a manual mill to CNC in his shed/workshop 14 years ago. Kudos!

[Mr. Dazzle]

I wouldn't pay someone to spend ages doing final fine cuts if it was a shed project either.

I mean...well, I would, but only because those sharp step overs make loads of potential crack initiators.

I wouldn't do it for aesthetic reasons!

He didn't pay anyone for the original cuts either...he converted a manual mill to CNC in his shed/workshop 14 years ago. Kudos!

Yeah I saw that. It's even more impressive when you consider that's probably Windows Vista era

[KungFooBob]

I wouldn't pay someone to spend ages doing final fine cuts if it was a shed project either.

I mean...well, I would, but only because those sharp step overs make loads of potential crack initiators.

I wouldn't do it for aesthetic reasons!

He didn't pay anyone for the original cuts either...he converted a manual mill to CNC in his shed/workshop 14 years ago. Kudos!

Yeah I saw that. It's even more impressive when you consider that's probably Windows Vista era

Hold my beer...

https://www.pcgamer.com/ray-tracing-mad ... ably-fast/

[Mr. Dazzle]

Hold my beer...

For 17 hours?!