Pazmany PL4

On Feb 26, 2:46*pm, (Drew Dalgleish)
wrote:
On Tue, 26 Feb 2008 03:00:47 -0800 (PST), JohnO
wrote:





On Feb 26, 8:23=A0am, cavelamb himself wrote:
Beryl wrote:
wrote:

On Feb 25, 10:58 pm, flybynightkarmarepair wrote:

I've since heard from Veeduber (who knew Pazmany, and flew out of the
same airport as the prototype) that you could smell the first ship
before you could see it, as it burned, errr flew off the first 40
hours with the belts constantly slipping.
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Well... mebbe it wasn't quite that bad... :-) =A0But with multiple vee
belts it's impossible to keep ALL of them at the same tension. =A0The
loosest of them would slip and there was a definite pong of hot rubber
after every flight.

Eh? I can't visualize it. Either all, or none, slip.

Nope. =A0That's not how it works, Beryl.

Oh, maybe if all the belts really were teh exact same size.
Or if the pulleys were really exactly parallel.

In the real world neither of thoese little details ever work out - quite
that exactly.

The biggest one slips.

How can you tell which is the biggest one?
Easy.
It's the one that slips!

As tehy say, YMMV...

Richard- Hide quoted text -

- Show quoted text -

Caveman, you cannot have one belt slipping and not the others. Think
about it - the pulleys on each shaft are all the same size and
rotating at the same speed. You can only have slip if one pulley is
rotating at a different speed to the other. If one slips they *must*
all slip.

The longest one slips on both pulleys.- Hide quoted text -

- Show quoted text -

Are these belts zero stretch? If they are then I'd agree with you. The
only zero stretch belts I am familiar with are kevlar reinforced
toothed belts running on cogs.

As long as the belts in the original question are stretched so that
the longest one is now the same length as the shortest one there can
be no slip.