Ton up Scooter

[rbgaz]

Did it "rocket up to 93 mph"?

no that was the ts 200 in 1989 :bigsm:

[warts]

As a comparison, there were a few brit bikes in the early 60's which would genuinely top the ton. Bonnie maybe 45bhp, no std bikes over a real 50.
A Velo Thruxton put out 40-41bhp and could pull 104ish, it was a hand built factory racer for the road with all the experience that a world championship winning factory could muster.
Aero's maybe slightly less frontal area, but more draggy profile, all those quiffs - no helmets.
Broke world records, 100.4 mph for 24 hrs for example.
Thick end of 40 then to pull a genuine, on the flat, hundred.

[GP Kevo]

The best thing you could do is improve the scooter's drag coefficient and gear accordingly. Wasn't this done in Italy in the late 1960's with a tuned TV200 running a streamliner faring made of paper mache like this guy did. I'd read (in Jetset or Scootering, can't remember which) he did 111 mph.

[RICSPEED]

I know we are talking real GPS speeds and full bodied scoots but this clip was many years ago and before the RB250 etc

http://www.youtube.com/watch?v=PQfPls3tKuo

yeah .. what i said back up the thread re balls out group 6 scoots

[dave wheeler]

a standard gp200 puts out say 11bhp that will take it to 65mph, tune the same bike to 22bhp, double the horsepower and it may best 85mph, so a 35bhp engine should be enough to get near 100mph? no because the faster you go the harder it is to cut through the air. i would have thought it wouldnt be too hard to come up with an equation that would tell you how much power is required to propel a given shape [a lambretta] through the air at 100mph, i suspect it would be way off anything a road going, or indeed racing full frame is capable off, group 6 bikes are so fast because of there shape and lack of resistance to air flow

[RICSPEED]

i have seen charts relating to bhp / speed / drag factor ... think the rule of thumb is something like " to double the speed your need four times the power " .. this was probbably in relation to cars rather than something that has body work that acts like a boat sail ..

[Daz Kane]

I think some of you guys need to come along to some of the BSSO race meetings, John 'Uffy' has a group 6 race scooter but it is a full fairing GP and was clocked by GPS, at Snetterton, at 113mph on the back straight and to give you some idea he wasn't the quickest on track! Although the argument is, that this is not a road going scooter is utter b@11@x, just tax and mot it, then it is. :fb:

[RICSPEED]

i get you daz .. i think that some felt that the tuning level meant they were not practical as a road scoot .. which is correct i suppose .. but what i was trying to say its one or the other .. a reliable road scoot with a good turn of speed .. or a group six level tuned one that does a ton

[jason frost]

to come up with an equation that would tell you how much power is required to propel a given shape

E=Mc2 :fb:

[red]

I think some of you guys need to come along to some of the BSSO race meetings, John 'Uffy' has a group 6 race scooter but it is a full fairing GP and was clocked by GPS, at Snetterton, at 113mph on the back straight and to give you some idea he wasn't the quickest on track! Although the argument is, that this is not a road going scooter is utter b@11@x, just tax and mot it, then it is. :fb:

Just to say that Uffy did have a tail wind but it's still bloody quick.

Guy Topper won all 5 races around the Snetterton 200 circuit and he won the last race with an average speed of over 73mph and a time of just over 1 min 36 seconds for the 2 mile circuit