Discussion
Hi there. Today I bought an HPI Rush Evo, and went to buy some fuel. I'd been reading up on them and know that HPI recommend 20% fuel for it. But the shop I bought it from only stocked 20% Helicopter fuel, so long story short, bought that. Doesnt run on it but runs on a mates fuel. Whats the difference?
Helicopter fuel is a different blend altogether. Mainly because helicopters run virtually flat out all of the time with marginal cooling, so the fuel itself is designed to protect and cool the motor under heavy load, high rpm and high temperature running.
Always use buggy fuel in a buggy (as you have found out).
Always use buggy fuel in a buggy (as you have found out).
tr7v8 said:
Interesting 20% nitro fuel will be 20% nitro, around 25% lube & the rest is methanol. The lube may vary but car & heli have similar requirements, very high revs, limited cooling. So cannot see why it'll be different & I've been running glow motors for years.
The motors themselves are quite different because the requirements are different. Car cooling is much better than heli cooling - the head on a .21 buggy motor is typically twice the area of a .50 size heli motor (!) The car motors must deliver across a reasonably wide power band whereas the helis are all top 20% of the rev range. Cars are typically variable rpm, whereas heli motors sit at peak power rpm or thereabouts during an entire 10 minute flight or whatever - especially if they are fitted with governors.Roop said:
tr7v8 said:
Interesting 20% nitro fuel will be 20% nitro, around 25% lube & the rest is methanol. The lube may vary but car & heli have similar requirements, very high revs, limited cooling. So cannot see why it'll be different & I've been running glow motors for years.
The motors themselves are quite different because the requirements are different. Car cooling is much better than heli cooling - the head on a .21 buggy motor is typically twice the area of a .50 size heli motor (!) The car motors must deliver across a reasonably wide power band whereas the helis are all top 20% of the rev range. Cars are typically variable rpm, whereas heli motors sit at peak power rpm or thereabouts during an entire 10 minute flight or whatever - especially if they are fitted with governors.tr7v8 said:
Roop said:
tr7v8 said:
Interesting 20% nitro fuel will be 20% nitro, around 25% lube & the rest is methanol. The lube may vary but car & heli have similar requirements, very high revs, limited cooling. So cannot see why it'll be different & I've been running glow motors for years.
The motors themselves are quite different because the requirements are different. Car cooling is much better than heli cooling - the head on a .21 buggy motor is typically twice the area of a .50 size heli motor (!) The car motors must deliver across a reasonably wide power band whereas the helis are all top 20% of the rev range. Cars are typically variable rpm, whereas heli motors sit at peak power rpm or thereabouts during an entire 10 minute flight or whatever - especially if they are fitted with governors.Gassing Station | Scale Models | Top of Page | What's New | My Stuff