Thanks for the reply and the information, as you have probably guessed I am a newbie to the sport. I am building a track using Scalextric Sport track, I have an area of 23ft long by 5ft wide reducing to 3ft wide for the last 6ft. This last six foot will be a little tricky to extend the track into so I am just trying to work out whether a 17ft straight is long enough to really let the cars rip or whether going to the extra effort to gain the extra 6ft is worth it. The intention is to build a permanent track that is quite technically challenging to drive on with a long fast straight to a R2 and long sweeping corners. Regards Peter