im bored and i got a notebook

[Dave]

Anyone fancy a gnome powered cafe racer? Spose I ought to figure out how to throttle the damn thing eh? A name might help too. Def gotta leave more space for the front wheel next time but at least I know what the frame should look like

[Rangerscott]

Hmmmmm..... Only radial Ive seen is this custom chpper. Looks like a cool way toget bragging rights.

http://www.youtube.com/watch?v=GEHTVQw2ql4

[Avatard]

Originally Posted by Rangerscott

Hmmmmm..... Only radial Ive seen is this custom chpper. Looks like a cool way toget bragging rights.

Looks like a good way to get a piston in the ass if you over-rev it.

[Porkchop]

Needs a little more rake....

[Dave]

Originally Posted by anthonyk

All that rotating mass would make for some interesting riding characteristics.

It would look cool as hell, though.

i was thinking about that. might feel a bit wierd but it would probably be pretty stable

Originally Posted by Avatard

Looks like a good way to get a piston in the ass if you over-rev it.

troof. it would also be hot, loud, and very very messy considering that rotaries are total oil loss. looking back at a bunch of the old fighters i see that most implemented a half cowl to keep the amount of castor oil hitting the pilot in the face down. maybe i could work one in that doubles as a scatter shield? one cool thought is that with all the centrifugal force, valve float would likely never be an issue. probably only need really light springs.

Originally Posted by Porkchop

Needs a little more rake....

i was actually thinking it needed less you'll notice i completely forgot to add triples...couple of inches more headstock would probably give enough clearance. ive had this thing floating around in the back of my head forever and i figured the objective for a first sketch was simply to suss out the frame shape and layout. i can work the details out later. its not like i have any money to build the thing.

on a side note i think ive worked out a way to add a real honest to god carburetor/throttle. no stutterboxes here

[Dave]

That's a radial, mines a rotary. Search youtube for gnome or le rhone rotary

Radial is still a cool ass bike though

[anthonyk]

All that rotating mass would make for some interesting riding characteristics.

It would look cool as hell, though.

[Dave]

Ok its throttle time.

Initially I had envisioned the right side mount as a skate ring with ball bearings. The throttle would be directly attached to the engine's side and the linkage would use a spring loaded plate that spun against a wheeled plate attached to the throttle.

This sucked on many levels. Fueling would be difficult, the throttle would be heavy, all the extra spinning parts would have a high failure rate, and. God only knows what the spinning force would do to the throttle action. Likely it would be at best inconsistant.

The second plan kept the skate ring but had it attached to a fixed intake tube that nosed into the crankcase under a large radial seal. This opened up fueling and air filter options but kept a large failure point in the skate ring and would be difficult to impossible to take apart/service.

So last night it hits me: I can simplify the whole shebang and make both side mounts equal in strength if I integrated the intake tube into the fixed crankshaft. Solves the whole damn thing as far as I can see. Gotta find some info on the airpaths on these things but I think this works



I wonder if two stroke oil would provide enough lubrication for the engine and the main seals?