nitro content

bullit132 Sun Apr 21, 2013 7:36 pm

does nitro content or % really make a differance in the noise?

SuperDave Sun Apr 21, 2013 7:47 pm

With higher nitro content with a given prop, yes the engine will make more noise because it's turning at higher RPM.

SD

pkrankow Sun Apr 21, 2013 7:56 pm

Sure seemed a lot louder than just a few hundred RPM change today. I was running 25% instead of 15%. 0% nitro has a much softer sound than 15% through the same engine.

I think the exhaust is louder because the charge has more power to it so more excess force is exiting the exhaust. Not too different than going uphill vs level in a car at a given speed.

Phil

**RknRusty** Sun Apr 21, 2013 8:41 pm

My Tee Dees are earsplitting with Sig 35. Like 20,000 RPM firecrackers right in front of me.

SuperDave Mon Apr 22, 2013 8:57 am

Rusty:

But NOISE is a big part of using nitro! All the 'electies do is go "WHIRRRRR".

How totally dull!

SD

**RknRusty** Mon Apr 22, 2013 11:15 am

RknRusty wrote:My Tee Dees are earsplitting with Sig 35. Like 20,000 RPM firecrackers right in front of me.

That being said, I have not compared the difference. I use either Sig 35 or Glowplugboy 24. When I run out of the 35 I'm not going to buy any more, just no need for the extra punishment to my Tee Dees that aren't a dime a dozen any more. I'll stick with something in the 25% range.

SuperDave Mon Apr 22, 2013 11:22 am

Rusty:

I have a quart of Cox 25 for $8.99 on order from Tower and will report after I try it in of my TD .051's. TH sez it'll be available mid-April.

Could this be a TH renaissance back into the world of 1/2A?

SD

**RknRusty** Mon Apr 22, 2013 12:04 pm

From what I've read about it, it's a similar blend to the Sig 25. It has a castor/synthetic mix of oil in it. It should run fine, and the price is right if the shipping is reasonable. Some cities will have hobby shops that sell it. If my local Hobbytown USA can get it I'll try it.
I'm not sure what the old Cox fuel was composed of.