If you want to go "Fast-e-nuff" now..... you do not have to make a real big investment.

Find yourself a Thunder Tiger .40 or .46, bolt that on the nose. Here in the USA you can buy those new for under $75 usually.

The TT40 is pretty much the "standard" for 424 racing. Combine with an APC 9x6 prop. On a scat cat, figure an easy 110 mph. Some more modern airframes and also the Viper, Predator ARFs - you are looking at 120mph straight line speed. Yes, dead stock engine.

Basically the same for the TT46, just move to a 9x7.

From there, for a few more $$$ bolt on a Jett-Stream muffler, or an Ultra-thrust muffler (the two are essentially the same type of tuned exhaust). Do nothing to the engine, just bolt the muffler on. Use the same prop to start with. Instant 1100-1200 rpm gain. Then you are talking 125-130 mph.

I can relate on what you are doing. I started flying r/c when I was 13 and had a paper route. Everything was an investment.

Interesting thing.... R/C aviation is probably the only sport in the world that has gotten less expensive over the past 30 years.

Bob