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ST3000 Conversion

Old 03-31-2011, 05:35 PM
  #26  
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Default RE: ST3000 Conversion

Hey back to ya.

Craing you'll need some of the Tygon fuel line like for gas, I use a Sullivan fuel bulb for gas to transfer Davis fuel from the can to the tank. It was bone chilling cold here today, maybe tomorrow I can wring out the 3000 on Diesel.

Craig, do you know what the 7D venturi diameter is by any chance. The 3000 carb I have is 11mm, man that's huge.
Old 03-31-2011, 05:37 PM
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Default RE: ST3000 Conversion

Thanks, AMB..    those are the Numbers that is convincing me to take the plunge into Diesel..  after trying it out on the ST3K, I might just have to change my OS 1.08 to diesel too..

and the Idea of running a hose to the end of the Plane for minimum cleanup seems like another perk..

Craig.



Old 03-31-2011, 05:49 PM
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Default RE: ST3000 Conversion

Craig many of mine use lite weight KandB Aluminum tubing to the rear right below the elevator the engine could care less and even quieter no power loss and a couple down the landing gear leg very little cleanup martin


martin
Old 03-31-2011, 05:59 PM
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Craig by the way I picked up the 1.08 a couple of years ago 18x8 prop Davis head almost pulled the bench over shut down and weighed it down with a cut off steel I beam do not have a plane yet big enough for it yet mmartin
Old 03-31-2011, 06:38 PM
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Default RE: ST3000 Conversion

Martin,

WOW, now that is awesome... the ST3000 is on an Ultra Sport 1000, and I have the bare bones of another US1K that I could probably put that 1.08 on, but I was thinking about making that into a twin of some sort.. so that aircraft with twin 1.08 diesels would probably rip it apart.

Also, How do you have that Tubing connected to the engine?? I would need it to be easily removable, so that I could install and remove the wing easily, but I still like the idea of running the exhaust to the end of the plane for minimal clean up...

Hobbsy, I am not sure of the ventri Diameter of the 7d, but I can get my Micrometer on it tomorrow and let you know.. (man, now I need a new battery for my micrometer)


Craig.
Old 03-31-2011, 06:58 PM
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Default RE: ST3000 Conversion

Craig just the flexible little exhaust extension in the LHS (they hold up fine to diesel) and wire wrapped to exhaust outlet on the muffler ditto one the other end just inserted the
aluminum tubing did the same, tried a plastic wire tie but it would come off sometimes martin

also no vibration transmitted to the tubing (soft connection)

I think a short piece of rubber fuel line from the auto would work too, but the flex extension has that nice bend in it and is gray not black rubber

Whoops missed removable just hard wire wrap the end that goes on the muffler and insert the tube in the other end just make a clamp for the pipe
and screw to the plane

I use thin alumnium about 3/8 inch wide to make the clamp 2 is enough one front one back screwed to bottom with a servo screw a little CA hardens the wood so it stays put and does not egg out the hole from removing and putting back

signing off for the night tis the hour to hit the sack
Old 04-02-2011, 04:57 PM
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Default RE: ST3000 Conversion

Craig and Martin, I got a chance to run he 3000 converted today, I just wanted to put some fuel through it and see how it runs and it runs very well. The prop I put on it is not ideal, its a Master Airscrew 20x6 classic which is a real horsepower eater. The ST 3000 is very smooth. I have a 20x6 Just Engines Jen-C 20x6, Jen-C 19x10 and a Mejzlik 18x10 I want to try. The Just Engines Jen-Cs are rebadged Bielas.
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Old 04-02-2011, 05:02 PM
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Default RE: ST3000 Conversion

Hobbsy,

I am looking forward to the Numbers you get with the 18x10, since thatis what I currently run on my ST3k, I get about 7700 out of the APC 19x10..

Craig.


Old 04-02-2011, 05:05 PM
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Default RE: ST3000 Conversion

Nlce Dave so much for glow and spark plugs the big STs with Davis heads have ruled for years martin
Old 04-03-2011, 06:26 PM
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Default RE: ST3000 Conversion

I was going to post a few days ago but let it go. If you want to run a diesel, do it. If you want economy, assuming you fly a lot, get the gasser. A gas engine will consume less fuel than the diesel and fuel expense will be at least 1/10th the cost of diesel. The RPM figures for the diesel are acceptable, but a DLE30 or Syssa 30 are up to 1000RPM faster on the 20x6. I like diesels which is why I run them.
Old 04-04-2011, 05:09 AM
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Greg, I had a Zenoah G-45 for quite a few years and it would turn a wood Zinger 20x8 7,200 or a wood 20x6-10 at 7,000. I cannot imagine an engine with almost 1 less cubic inch turning a 20x6 more than about 6,500.
Old 04-04-2011, 07:18 AM
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Default RE: ST3000 Conversion

Check the DLE30 thread. I don't make this stuff up.

http://www.rcuniverse.com/forum/fb.asp?m=9477166

More than one datapoint and individual results in the thread. The ST design is how many years old?
Old 04-04-2011, 04:55 PM
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Actually I read the first 8 pages this AM and got busy, that still wouldn't sell me on a gas engine, I sold all of them except my Quadra 35 and MERCO .61. I converted my Tartan 1.34 from gas to Diesel. But if those Syssa numbers are true that is impressive.

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