Speed,Combat,Scale,Racing > Carrier
Question about the rule book
C.T. Schaefer:
I am busy working on a new profile ship so I can use a r/c throttle. It will be a new learning experience. It has been a while so I looked at the rule book on line and it prompted 2 questions. First that the contest will provide fuel of 10% nitro. and then it says that IF that fuel was used then there are no mandated requirements for exhaust extensions. This seems to be different than a few years ago. What does 'IF' mean? Thanks, TS
PS Not that it matters but I am still sore about the rule banning mufflers 45 or so years ago.
Bob Heywood:
If you run basically an open face exhaust or an extension no longer than 3 inches fuel is unrestricted.
If you run an engine with any sort of exhaust extension longer than 3 inches you must run 10% spec fuel supplied by the event director. In practical terms this applies mainly to the Nelson engine fitted with the Nelson tuned muffler.
The wording of the rule could stand to be improved.
C.T. Schaefer:
Thanks Bob, that's what I thought but it totally does not say that. TS
Paul Smith:
I don't believe that mufflers or tuned pipes were ever banned. It just said (in terms written by an amateur government lawyer) that if you used an exhaust extension over 3" you had to use 10% nitro. So you can't have BOTH a pipe and high nitro at the same time.
I have a plane with an exhaust pipe and I used my own 10%, unless the ED happens to have a house fuel, which is rare.
john vlna:
mufflers 3 inches or less we allowed, but I think tuned pipes over that size were not until the 10% rule was passed. I used a long tuned pipe on a profile with 10% for a while. Fun but hard to get both high and low setup right. The Nelsons and tuned muffler made all that obsolete.
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