Lol!

Sorry to inform you, Ian, but paella is not a Mexican dish! ...

never said it was.

 

We make paella at home. We use chorizo, loosen it from the casing, fry it and add it to the main dish. It adds a bit of extra heat!

 

Fruit-Loop trip to Hood River.




Stopped for some Chinese food on the way back.

 

Fruit-Loop trip to Hood River.
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Stopped for some Chinese food on the way back.
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You seem to be quite fond of oriental food, Spook ...

 

Rayol-Canadel-sur-Mer

 

Managed to get on the water to watch the St Tropez races.

 

Why is it that other people's lives so often seem far more interesting than mine? *sigh*

 

Why is it that other people's lives so often seem far more interesting than mine? *sigh*

 

I helped my daughter develop the chassis for a balloon powered vehicle for her AP Physics class.

I knew those CD-R's, which I bought before she was born, would come in handy some day.

This thing glides like it's on ice.

 

I helped my daughter develop the chassis for a balloon powered vehicle for her AP Physics class.

I knew those CD-R's, which I bought before she was born, would come in handy some day.View attachment 333148

This thing glides like it's on ice.

Nice! ... so you 3D printed the chassis, right? ... what did you use for bushings? I can't tell.

 

Nice! ... so you 3D printed the chassis, right? ... what did you use for bushings? I can't tell.

No bushings, just a simple journal bearing. The axle is highly polished 0.062" diameter piano wire, so the interface between the axle and the journal is nearly frictionless. The ratio of the wheel diameter to the axle additionally greatly reduces whatever friction is left.

There's a small polished washer on each hub that acts like a half-way thrust bearing, but there's no load on it so it's not really doing much but keeping the plastic parts from grinding against each other.

The hard and thin polycarbonate "wheels" eliminates any rolling friction, and the high moment of inertia keeps the linear velocity of the vehicle low for a given total kinetic energy thereby reducing drag.

The whole point of this vehicle: once in motion, stay in motion.

 

If you put too much data on the CDs that would overload them and make them too heavy.

 

If you put too much data on the CDs that would overload them and make them too heavy.

That would help!

Increasing the moment of inertia of the wheels increases the KE at lower velocities thereby reducing drag. I'm thinking of a revision where I can mount a large lead ring on each wheel to demonstrate this. Balance would be an issue, though.

 

That would help!

Increasing the moment of inertia of the wheels increases the KE at lower velocities thereby reducing drag. I'm thinking of a revision where I can mount a large lead ring on each wheel to demonstrate this. Balance would be an issue, though.

Ah! You are correct. I thought when you said balloon, that this thing was supposed to fly.

Then write the data on the outer tracks only. Make sure you write 64-bit data only.

 

I thought when you said balloon, that this thing was suppose to fly.

As I believe you correctly surmised, the balloon is for thrust.

 

As I believe you correctly surmised, the balloon is for thrust.

Daughter won 1st place with 5.4 meters.

 

Daughter won 1st place with 5.4 meters.

You mean this dad beat other dads for first place.

 

You mean this dad beat other dads for first place.

The kids are standing on the shoulders of giants.

 

The kids are standing on the shoulders of giants.

and I suppose that humility is just another one of your great virtues?

 

and I suppose that humility is just another one of your great virtues?

I'm the most humble person I know.