Vintage Walens Trident Shaft Drive Bicycle? Any Clues?

[highlandsflyer]

http://www.fusionstudios.net/hill-climber/Album/hill-climber bicycle_story.html

http://bikesoup.cc/25/reviews/biomega-copenhagen-review-shaft-drive-designers-dream/

Some places I am reading that shaft drive with bevel gearing is less than ten percent less efficient than a properly fitted and lubricated chain. I wonder what the deficit is with belt drive?

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[elPedro666]

Some places I am reading that shaft drive with bevel gearing is less than ten percent less efficient than a properly fitted and lubricated chain. I wonder what the deficit is with belt drive?

Belt drive is practically as efficient as chain now I think, but I imagine that chain efficiency (well into the 99%s I thought :? ) diminishes more rapidly in the gloopy cack.

Only a few motorbikes use shaft drive, partly because of the weight but mostly I think because of the way it delivers power - twisting or squatting the suspension.

Somebody will give a much better account of that any moment now I'm sure!

 

[gtRTSdh]

Some places I am reading that shaft drive with bevel gearing is less than ten percent less efficient than a properly fitted and lubricated chain. I wonder what the deficit is with belt drive?

I don't think RWD (Right Wheel Drive) BMW's use 10 times more fuel than FWD Audi's, where are you getting that from, LOL? Gears are typically very efficient!

 

[legrandefromage]

bmx:

 

[hamster]

Bevel gears have larger losses than a well-maintained chain system. While throwing away 10% of the power on a motorbike may be acceptable (and typically they only have a single set of bevels as the engine is usually rotated) it's a big hit on a bike.

Shaft is OK in a bike that would be poorly maintained, otherwise a disadvantage.

 

[highlandsflyer]

Interestingly, the Danish shafters reckon their bevel gearing is 10% MORE efficient than an 'average' chain and sprocket system, in terms of transmission loss.

Damn lies I reckon. (Just my opinion.)

Shaft drive motorbikes come in all flavours, and are generally well sorted these days. My oldest one was an early eighties Kwakker when i was dispatching. Had an old airhead BMW with the paralever, that was pretty sorted. Not really performance bikes though, but plenty doing the shaft thing now very well indeed.

 

[highlandsflyer]

Some places I am reading that shaft drive with bevel gearing is less than ten percent less efficient than a properly fitted and lubricated chain. I wonder what the deficit is with belt drive?

I don't think RWD (Right Wheel Drive) BMW's use 10 times more fuel than FWD Audi's, where are you getting that from, LOL? Gears are typically very efficient!

I don't really get where you are getting that from in my post, either.

 

[gtRTSdh]

Some places I am reading that shaft drive with bevel gearing is less than ten percent less efficient than a properly fitted and lubricated chain. I wonder what the deficit is with belt drive?

I don't think RWD (Right Wheel Drive) BMW's use 10 times more fuel than FWD Audi's, where are you getting that from, LOL? Gears are typically very efficient!

I don't really get where you are getting that from in my post, either.

re-read your post, I read it as 10% efficiency, not 10% less than chain, my bad.

 

[hydorah]

Well, a shaft driven bike would rule out a derailuer and those funky planetary gear systems are more lossy due to friction than properly looked after chain drive/derailuer setups... And only comparable in terms of weight at the very high end... Where they are pretty costly and when it goes wrong? £!

That's where the only real drawback to a belt system on a bike gets you too, rules out derailuers putting you in the SS/hub gear gang

- Don't think they is discernible deficit chain VS belt, maybe a challenge to make a belt system as light as a chain system?

In machinery high torque start stop heavy duty stuff is chain, but for a human powered machine a 3/8 or so reinforced belt would be cool and last for a loooong time some motor bikes are belt but it's usually only the two wheeled armchairs, not the light and fast ones!

 

[elPedro666]

Hub gears are coming on quickly (at very long last) though - I genuinely don't think we'll be seeing derailleurs for many more years...