Author Topic: Stunt Fuel (Read 956 times)

Gary Alspaugh · « **on:** April 02, 2015, 01:25:35 PM »

Do I use 5% or 10% nitro with a LA 46 in my stunter?

Dennis Moritz · « **Reply #1 on:** April 02, 2015, 02:17:31 PM »

Depends. 10 will give a fatter needle a bit more power and less duration. 5 will do the opposite. Usually.

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Randy Cuberly · « **Reply #2 on:** April 02, 2015, 02:22:51 PM »

Where do you live, as in what's the altitude, general temperature, and what airplane are you using the engine in.

There is really no universal stunt fuel if you're serious. If you're not serious just use the cheapest stuff you can find with at least 20% oil.

If you are serious just answer the above questions and I'll tell you. Very likely a lot of others will also and you'll still be confused!
Unfortunately it's one of those questions!!

Randy Cuberly

peabody · « **Reply #3 on:** April 02, 2015, 03:33:37 PM »

I'm a believer in 10%.......easier to needle....

Have fun!

Brent Williams · « **Reply #4 on:** April 02, 2015, 05:23:34 PM »

With regards to the question of needle sensitivity, will lower nitro content fuel be less sensitive on the needle settings or more sensitive?

RknRusty · « **Reply #5 on:** April 02, 2015, 05:26:42 PM »

Quote from: Brent Williams on April 02, 2015, 05:23:34 PM

With regards to the question of needle sensitivity, will lower nitro content fuel be less sensitive on the needle settings or more sensitive?

Less nitro makes the needle more sensitive.
Rusty

Randy Cuberly · « **Reply #6 on:** April 02, 2015, 08:25:06 PM »

Actually more nitro requires a richer needle setting and typically it is less sensitive but not always. That depends on compression and venturi size, etc, etc, etc. Not to mention the glow plug and prop load!

Randy Cuberly

Steve Helmick · « **Reply #7 on:** April 02, 2015, 08:53:52 PM »

We usually use 10% simply because it's what the R/C guys want. Keeps the glowplug hotter for their prolonged idle and they seem to think that a dead-stick landing is dangerous, for some reason I've never understood. I did fly R/C (and CL and FF) until my Sr. year in HS.

Steve

Matt Colan · « **Reply #8 on:** April 02, 2015, 08:56:24 PM »

I use 10% only in the LA 46's I've run. They're just too wimpy on 5% when you get above a 60 degree temperature, at least that's what I've found.

Randy Cuberly · « **Reply #9 on:** April 02, 2015, 09:06:16 PM »

Quote from: Matt Colan on April 02, 2015, 08:56:24 PM

I use 10% only in the LA 46's I've run. They're just too wimpy on 5% when you get above a 60 degree temperature, at least that's what I've found.

Come to Tucson when it's 100 degrees at 2400 ft elevation and you'll find they can be wimpy on anything less than about 25% nitro!
15% works OK here in the winter time.

Randy Cuberly