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Old 04-24-2008, 10:16 AM   #11
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Re: Nitro Race engine

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Originally Posted by Frequentcrasher View Post
Here's an option: With the new Long stroke engines coming out and racers updating to them, you should be able to find a used short stroke nelson pretty easily. About $160-200.
Do those come with a throttle or just a straight venturi with a barrel to shut them off?

I have run a few Nelsons but never owned one. I wouldnt mind getting my mitts on one of my own just to hear an engine run REAL fast once and a while.. (the Nelson .15 my FF comp. buddy loaned me to run ran upwards of 35,000 rpm - one of the only engines that sort of frightened me in my whole time in this hobby!).

I would grab one if a used one in god shape came up for under $200.

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 04-24-2008, 01:45 PM   #12
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Re: Nitro Race engine

They are like control line engines with no barrel. Shut down is by a servo which pinches the fuel line. The ST40 RI/RE you have is FAI and although not up to the new engines will turn some good rpm with the tuned pipe. When you fly with it you will step up a few notch's from sport. The first time going real fast gets a bit scary until you have a couple of flights.
I am not sure if there will be a lot of extra engines for sale. Ed can answer that one if he is still on. My thoughts on it are probably not for quite a while. I am not sure how much rpm you will gain with the new engines but the engines are rebuilt using new liners and piston's and knowing Dub or Henry they may have some improvement for the older setups. Anyways I believe most guys will keep them for a backup or for practicing. That way you do not burn up your number one engines playing around.
My favourite class was FAI as I like to tinker and did a lot of testing. You need a 40 size engine running 80/20 fuel and a tuned pipe. When I went to the WC's the Nelson FAI was just shown in public and the US team had them. Although they won they did not clean up. There was a gent by the name of Bruce DeChastle (AUS) that came in second and had a flyoff as it was the first time there was a tie. I used modified Shadel ST40's and I will tell you, you never got near the prop. Carbon fiber at 25k removes digits quite easily. That was the rpm I launched and it was rich and when it unloaded it screamed.
Being competitive and having a good engine is one thing but being consistant and tight on the course taking no 0's will take you quite a ways in competition. Some guy's are faster but not to good as they are jumping around. If you run an oval just outside the poles and not pulling to hard is the fastest.
Hope this helps a bit as I don't race anymore because I broke my heels which kept me out for a couple of years and then I needed new equipment. To be with the fast boys cost money.
John Davidson
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Old 04-24-2008, 05:08 PM   #13
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Re: Nitro Race engine

Hey Andrew,
love your column, never miss it.
Here ya go:

Only the Q40 engines are venturi based and shut down with a pinch line. Q500 Neson's have a throttle barrel and a regular carb set-up that is familiar to all of us, but they won't idle. After your heat, you throttle down, killing the engine and become an expensive glider. There is no low speed needle on the carb, only high end. The throttle barrel is merely used as the shut off. I guess this is a holdover from the days when the Quickie rules said your engine must idle for a few seconds before throttling up to race. They are a little scary and Dub makes a remote needle for his Q500's. I wish Henry did too. I prefer my blood inside my body! A situation that can be quickly reversed with these engines if you're careless...
Unknown airport with Cessna 150 circling overhead, identify yourself."
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