My friend gave me this O.S Max 10 engine that he found, i went and bought fuel, fuel lines, anew glowplug, 1.5volt battery and the sparkthingy that connects to the battery, but then i was wondering how do i control the speed, the is a mixture screw but no carb, i asked the guy at my local hobby store and he said it doent nee a carby, im making an airboat in my engineering class i have 2 servos but im wondering does it need a carb and how to i connect it to the servo? Any help would be appreciated!

P.S I put up two pictures of it

Greetings,

I could be wrong, but that thing appears to be a line control or free flight style engine, there isn't a throttle control on it. The barrel opening you see in the front with the needle valve is the carburetor.

Without serious modification (Different carb to start) you aren't going to get a throttle control on it.

Again, I could be wrong but that's how I see it.

You have a Control Line and/or Free Flight engine. Two speeds: Stop and Go. No Control. May I suggest you either trade it for one with a carb, or sell it on some auction and buy one with a carb. Good luck.

What you have is a control line (U-control for some of the older generation) engine.

It does not need a carburetor to run, but it will only run at one speed- wide open! this is not a huge deal, other that your airboat will move along at the fastest speed the engine will pull it, with no way to slow it down. To use this engine on your airboat, you'll only need one servo to operate the rudder.

As far as starting it, you'll need to connect two lines from the engine to the fuel tank- one from the carb to the fuel pick-up line on the tank and one from the muffler pressure tap to the vent line on the fuel tank.

After you've filled the tank, put your finger over the exhaust outlet on the muffler and flip the prop over several times (WITHOUT THE GLOW PLUG CLIP ON) quickly to prime the fuel system- you should see the fuel run through the pick-up fuel line to the venturi nipple.

Once the system has been primed, connect the glow plug clip to the glow plug and quickly flip the propeller counter-clockwise. Make sure to use a 'chicken stick' or electric starter, and be sure to stay out of the way of the prop!

(WITHOUT THE GLOW PLUG CLIP ON)

do you mean take the glowplug out or the whole top so the piston is able to be seen?

EDIT: dont worry i think i no what u mean is the glow plug hit the thing that connects to the battery?

oh also how to i shut of the motor?

pinch the fuel line going into the carb and be super careful to not stick your hand in the propeller....

Does that prop look like it's mounted backwards to anyone else? If you want it to be a "pusher" engine, (and I'm guessing you will for an airboat), you will have to get a reverse "pusher" prop. You can't just reverse the prop & run the engine backwards, even if it runs that way, it'll run poorly & try to self-loosen the propnut. I'd suggest finding an engine meant for rc use w/ throttle control and maybe finding someone at your LHS or local flying club to help show ya how to get it running & get the needles set for ya. Oh, and never stand in line with the prop while it's spinning! A blade letting go at 12,000 rpm can do serious bodily damage to ones bad self! Ask the one-eyed smiley->

Do a search here on RCU in the boat forums, I'm sure there's alot of guys building airboats there that have alot of valuable info for you to read up on.

Good luck, be safe & enjoy ctrain7,
-rep

Indeed it is a conventional prop mounted backwards, it is not a pusher prop.

John

This is not a toy. I suggest you find someone that has some experience starting and running glow engines. This can easily take a finger off if you are not careful and if you don't know what you are doing, and by your posts, you clearly do not know what you are doing.

This is not harsh, it's reality. Don't hurt yourself by trying to run this engine without help.

CGr.

+1

I hope you are going to secure that engine before you try anything. As said above, find someone that knows how to start / tune it. Also as said, it's not the right kind of engine for an airboat, you need one with a carb that has throttle control. ENJOY !!! RED

yea +1 for that.Ctrain7 i can see something bad happening if you try too start that engine on a homemade air-boat or anywhere for that matter .your engineering teacher well be tickled pink while Dialing 911. like the guys were saying, there's no way too control the speed,you start it and its going too go full tilt. do yourself a favor and go get a Electric motor for your Air boat.

Wow, lots of gloom and doom predictions for a dinky little .10 size engine. Sure, every engine is dangerous, but this is only 2xs the size of the little .049 cox engines we played with when we were 8 years old. We didn't have "experts" around, we just read the directions on the box and went for it. Put it on the boat, start it, keep your fingers out of the way, point the boat away from you, let it go and have a blast. If it works it works, if not it won't be the end of the world.

A quick note about the "spark thingy", this is a glow engine, meaning the "plug" glows red hot and stays hot as the engine runes, there is no spark.  Just something fundamental about glow engines you should know.

So you are going to put this on an airboat. Just in case it hasn't been made clear earlier, you will need a way to retreve the boat from the water. You've learned that this is an ON/OFF type engine which means there is not way of controlling throttle. I, however, am not sure that you know that once the boat is launched you do NOT get to controll the OFF. It will shut down when the fuel supply is exhausted. That means in the middle of the lake somewhere. Just a little FYI for your planning purposes.

Dinky little .10 size engine? It's not doom and gloom, it's reality. An absolute beginner, and based on what we've read from the OP, he is a beginner indeed, must understand that it isn't the engine, it's the prop. Someone really needs to show him the right way to handle even a "dinky little .10 size engine".

I have a nice scar from five stiches on my right index finger caused by a "dinky" little electric motor. Safety is the prime issue with any operation of these engines. Someone really needs to show him how to do this properly. Once that prop starts to rotate at about 2500 RPM it is virtually invisible and a beginner only reaches through the prop arc one time to both realize that he made a mistake and, again, ask for someone to take him to the emergency room.

CGr.

Right on the Money CGR, you should see the scar on my arm from a .049 TD swingin a 4.5 X 3 at 21000. A .10 with a nice sharp APC prop can hurt you real bad if you rech into it.

rrragman

Like I said, "every engine is dangerous" and "keep your fingers out of the way". Me and my friends, from the time we were 8 years old on, ran .049s for years following those basic common sense rules and had no problems. Sticking your finger in the prop is "reality" when you don't follow those rules. Were you an "absolute beginner" when you stuck your finger in the prop or did you get careless and forget?

That's not what you said. You said

The only part of it that makes any sense is "keep your fingers out of the way". But, for a beginner, someone that has never been around these engines, what does that mean?

Someone needs to show him/her what "keep your fingers out of the way" means. Even with my expreience, I still cut my finger. Don't generalize or simplify or offer advise on that is, in itself, incorrect, on something that has potential dangers involved.

CGr.

tsk tsk.... There you go with more of that gloom and doom.

Here here!!!

Good advice... I have 21 stitches on one hand to testify to that

It's not only beginners that make mistakes, for sure. I have a sweatshirt that has four diagonal slices in the right sleeve that could easily have been my right arm. And that was from reaching "over" the prop arc that I KNEW was there!! Last time I did that. I was lucky.

CGr.

I think 049 engines have probably shed more blood than all other sizes combined. Get a good stout leather glove for flipping the prop. You will be glad you have it. You can control speed a little bit. The needle valve can be rotated out to run the engine as rich as it will run and in to run it as lean as it should be made to run. Maybe you can hook a servo to turn the needle one click at a time. You can also rig a pinch off to kill the engine when you want to.

I agree with you smithcreek. You can't say the advice is for everyone, there is always someone out there who can't even cut an apple without requiring 8 stitches. Either you're careless and get hurt with anything and everything, saws, hammers, breaker boxes, etc.
Or you respect the obvious and potential danger and like myself, never had one incident in 39 years and counting.

Turn that prop around, make sure the prop nut is tight. Throw your success on youtube for us and post the link please. Like the saying goes, no guts, no glory.
How did you plan to mount the engine to a test stand? We could walk you through it.