Hi all,
         would the inclusion of a Nelson plug effect this engines stunt run?

I know zip about Nelson plugs except what I read on the net and am running on the assumption that they may be too cold.

Thanks.

Is this for your standard SS30 or that butchered one, Chris?

I don't know about Nelson plugs, but the engine will be very happy on something like an Enya #3 or an OS #8.

What is this current project?

Chris, I'm not sure it would be a good combination as you describe it.  A standard SS30 will turn a 9x6 at close on 15000. That's about the smallest prop I'll use with it (for Plank racing, not stunt). With a 9x4 you'd be seeing, I dunno, 17000?   . Sure you wouldn't be running it peaked, but it still seems wrong!

I'd suggest trying the engine with a more suitable prop for the model. Depending on the extent of the TR mods, it might still work fine. If not, then your standard SS30 would be the way to go. With my SS30 Miss BJ, I've tried a Bolly 9.5x6, which works well and gives 5.0 sec laps, and an APC 10x4, which I like even better and laps slower. I'll try a 10.5x4.5 next time I take the thing out. The engine runs a very consistent wet 2. I've heard of people running a 4/2 with a 10x6 but I doubt it is using the engine to its best potential.

Cheers
Steve

My big block nelson with tuned muffler is a bit picky on fuel with the nelson plug.  At a recent contest it would not hardly run on powermaster gma 10% 22 percent oil, but ran fine on Powermaster 10% 17 percent oil fuel.  I had similar problems on a 36 that I made from a os 40sx , my own crankshaft and ,full wave pipe and nelson plug, did not like sig fuel at all, and ran fine on Riches Brew.   Merlin makes some nelson type plugs, I will try them and see if those plugs are as picky.

Chris,

Why not run it the way it was built. 20% Nitro 20% Oil and run an 8X8 prop?

That way it'll not have problems fouling plugs and I guarantee your pulse will be elevated. 

Greg

The Nelson plug gives you more horsepower, regardless of what you use the motor for.  Typically it will give an extra 500-1000 rpm, or maybe turn a bigger prop without overheating.

If the motor has had extensive timing changes it will never give you a typical stunt run.  It'll have to run high rpm.  A small venturi helps restrict the speed the motor can pick up when it does lean out.  One set up I use on an LA 46 is a small enough venturi to limit the peak rpm to around 11,500, with the motor running at 10,500 or so in a 4 cycle.  When it leans out nothing drastic happens.

Filling in the front of the crank will only make it run better.  No worries there.

Chris,

You've asked all the questions, you've got all the opinions - NOW, Run the sucker!

Put a prop on it fuel in the tank and let it rip.

Bring it to Whalan on Saturday & I'll do it for you! 

I'll even supply a newish 8X6 prop.

G