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Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:27 am
by sean brady scooters
ducting the air and using it for cooling ..........does not increase drag................
or at least does not have to.........
all you are doing is to just utilize some of the air flow through your cooling system .instead of just diverting it all around your bike............
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:34 am
by Avantone
Lam46 wrote:Avantone wrote:sean brady scooters wrote:i agree that the exit of hot air from around the cyl could be greatly improved..................................
i,ve a few ideas on this myself..............based on chimney stacks.........and the venturi effect .............
sounds a bit crazy.......does it not...........
anyway..........
back to fans/scoops.........
and again.........ive tried this...........
if you combine the std fan with an intake scoop............you would prob find as i did that the two methods dont actually improve things greatley
at low speeds the fan will force air into the cowel area of course............but instead of flowing around the barrel/head..........a lot will be lost out of the scoop...........
at higher speeds............40mph plus..........the forced air from the scoop will hit the forced air from the fan.............
both of which are coming from opposing directions..............
therfore one cancels out the other..................
How about if the air scoop/duct fed into the flywheel cowl,
into the direction of flow - that way it couldn't be possible for fan generated flow to short circuit back out of the scoop/duct
This my Ideas tony from earlier..
Something I have in mind regarding expelling the heat would be a vented flywheel cover, vented around the outside of the flywheel cover which I was summasing would turn the rotating flywheel from forcing cool air into the head area to forcing the hot temps out of the vents in the flywheel....It would certainly give it an escape ...Another idea I have is to incorporate a fan in the ducting to force more air through (non electric) which would run solely on force from the air being forced in..much the same as a childs windmill being blown..
I think the fan design would probably just pull cool air in and then blow a proportion out of the slots without having much impact on the cylinder/head temperatures.
If the air was being forced into the ducting a passive fan wouldn't do much other than disrupt the flow, however a reasonably sized duct could flow a good volume of air.
Aesthetics aside, I'd probably duct from behind the front wheel or adjacent to the front mudguard by cutting a hole(s) in the legshields and duct across the top of legshields rather than underneath and down over the head/cylinder to exit tidily underneath and behind.
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:35 am
by RICSPEED
you could force the air past the cowl vent causing a suction effect
,they used this to cool the rotary norton race bikes
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:36 am
by Avantone
sean brady scooters wrote:ducting the air and using it for cooling ..........does not increase drag................
or at least does not have to.........
all you are doing is to just utilize some of the air flow through your cooling system .instead of just diverting it all around your bike............
Agree it doesn't have to unless you strap a dirty great scoop into the airflow where there was nothing before.
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:37 am
by Avantone
RICSPEED wrote:you could force the air past the cowl vent causing a suction effect
,they used this to cool the rotary norton race bikes
Yeah just needs some tinwork to extend the exit cutouts into the airflow
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:40 am
by Andy Pickering
So basically you would end up with something that looked like the deloren (sorry about spelling) from the film back to the future but it would run cool as a cucumber and would keep cool and not seize at high speeds tuned to death...mmmmmm ..? yes I could live with that..while they all would laugh/take the p155 Id be blowing by them sat at the road side ringing the AA...Yep still live with that...
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:41 am
by Avantone
Guys I'm grabbing a cold drink - have a virtual one on me
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:44 am
by RICSPEED
Avantone wrote:RICSPEED wrote:you could force the air past the cowl vent causing a suction effect
,they used this to cool the rotary norton race bikes
Yeah just needs some tinwork to extend the exit cutouts into the airflow
what they did was use a duct into the exhaust at an angle going back to the engine to draw air through rotary piston thing
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:46 am
by Andy Pickering
RICSPEED wrote:you could force the air past the cowl vent causing a suction effect
,they used this to cool the rotary norton race bikes
So all the cold air running under the scoot could be harnessed say from the back of the frame in a scoop effect..(like in an umbrella effect like slowing a drag bike) and pushed back in the under sidecans area to cool...ye like that but it would be ugly but...but running all day at speed is the key not winning a beauty contest...
Re: Fans /airflow / techies wanted
Posted: Sat May 16, 2009 12:46 am
by sean brady scooters
cheers matey..........
good topic this................lets have a drink and a break...............we deserve it lads.........................