RE: RedWing MX2 Build
 

Looking at the plug. It looks like the engine is way to rich. Did you use a tachometer to make sure that the engine is running at peak RPM. You need to set that with the high needle adjustment then you adjust the low needle to have smooth transition. At that point you should be close with the needle setting. The porcelain by the electrode should be a light brown or tan when you get it right. Black crud around the plug shows a rich condition or to much oil in the mixture. Light gray shows a lean condition. Make sure that your engine is warmed up before you make any needle adjustments. You won't be able to set a cold engine properly.
Once you get your mixture right and you still have problems. Lift the tail of the plane or pick it up and point it down. If the engine dies you may have one of the early reed valves that they had problems with. Can't remember exactly but I think they were to stiff. You should have a JC distributer in Spain that can help you. If you can't find help there let me know and I'll get you in contact with someone here in the States.

RE: RedWing MX2 Build
 

One more thing. You can replace the pulse tubing with the yellow tygon fuel line. That should not be leaking there at all. That will give you running problems or even not running at all.

RE: RedWing MX2 Build
 

I have already replaced the "pulse tubing" with tygon. It was a far firmer fit. The original felt more like glow tubing after it ages, vsry eastly to slip off. The tygon needed a little force to get it on and i've zip tied it for good measure too.

Going to try running the engine at work one day with the cowel off so i can see there are no air leaks etc.

Currently running 1:40 as per manual for breakin, its only gone through 2ltrs.

What should i be expecting from the motor as new? High idle speeds or normal.

Also how can i tell if the idle point is set correctly by the servo, ie the relation between low mixture and servo arm position.


Edit:
Just googled the pulse tube and what its for..... makes sense that it would run badly if there was a leak.
Also found another thread of someone having problems with a DLE50, he described exactly what I have. not being able to idle less than 2000 or so rpm. his was air leak and rich settings, and ran with 3 turns out on the low speed needle... which we had on mine today at one point!
will definately get it running with the cowel off some day this week.

RE: RedWing MX2 Build
 

I can tell you that when mine was new I was getting around 2,200 RPM at idle. That s why I used a 6 pitch prop so I can slow it down on landing. Then I found out that the 18-6 is an all around great prop for the plane so I kept it that way.

Like I said you have to get your mixture right first. Then you set the Idle RPM with the tachometer. There is no relationship between Mixture and servo arm position. The servo position works jut like a glow engine.

Just try not to over think things. Take it one step at a time.
1- High RPM mixture set for best RPM. Engine must be warm.
2- Set low end mixture for smooth transition. You Should be able to slam the throttle stick forward wit no hesitation.
3- Set the idle RPM with the servo trim just like on a glow engine.

Just remember that new engines sometime don't idle very well. I had them both ways. Some are just great right off the bat and some take time. Once you have it broken in. It will idle just fine. Some just need time and you need patience. You'll get it.

You should be somewhere around 1 3/4 turns out on high needle setting and 1 1/2 turns out on low needle setting. If you are not close to that then start all over again from that spot.

PS. It is not unusual to end up around 1 1/4 out on low needle setting. Your engine will tell you what it needs. Remember to always make small turns on the needle. The width of the blade of a screwdriver is a good guide.

RE: RedWing MX2 Build
 

What you just described is what I have had!

I think your "dont think about it too much" is dead on.. I think my lack of experience is complicating things and execting too much from the engine out of the box.

The only problem is that on our hard runway the plane runs away.. that is RUNS away at an idle over 2200..

Like I said.. i´ll run it with the cowel off to check for air leaks and to be able to SEE things going on.. try and finnish the 5ltrs I have at 1:40.

also yes.. i´m on an 18x6.

shame theres no 18x4 for breakin!

RE: RedWing MX2 Build
 

You will be just fine. I was where you are at now 2 yrs. ago. You seem to pay attention to detail and I'll be t you will be the guy in the future that others will come to for help.

The other thing that you can do is bring the plane in slow and and use your kill switch to kill the engine after touch down. You may need to get creative and use the things you have at your disposal. The more flight time you have the better. Touch and goes I won't recommend till you get the engine running smoothly. Cuban 8s. Are good for break in just don't let the engine come all the way down on idle on the down lines.

Use the guide lines and get that plane up in the air. The more time on the engine the less you will be struggling. It won't take long.

RE: RedWing MX2 Build
 

I´m already "that guy" for planes in the club anyway hahaha.

currently teaching a few people to land PROPERLY.. rather than controled crashes they´ve been doing since forever-ago.

RE: RedWing MX2 Build
 

Another thing that I always use is my Idle down switch on the radio... I set my plane for low Idle on the ground but when its in the air I kick it up a few hundred RPMs.  I don't know what the numbers are, I just go by sound and thrust.

RE: RedWing MX2 Build
 

would be usefull.. if I could get it to idle at low speeds..... and if my radio had that option...

:D:D:D but yeah I do like that idea!

RE: RedWing MX2 Build
 

I wonder if you add just a bit of drag to your wheels if that would keep her from wanting to run away on the pavment.
I put a small piece of fuel tubing beteewn the wheel an wheel collar and adjusted my wheel drag.
I did this on a cap 21 with a st 3000 back when I was flying off of pavment.
if you put to much drag then you'll have to use alittle more elev.
Run time on your engine will eventualy bring the idle down.
Frank Bowman makes a nice ring that makes your engine break in alot faster consequently lower idle

RE: RedWing MX2 Build
 

+1 for this. I actually put this on a three position switch. I have a ground idle/taxi setting, a "landing idle" setting, then a flight idle. The first is self explanatory, as low as I can get it and still get a smooth idle. The second takes some time and practice to find. It is the setting at while the plane sets into a nice landing glide path. Flight adjustments are made with trim. The final setting is the lowest RPM that will keep the plane in the sky and are usually a few hundred RPM above landing idle. I ended up using three mainly because I have a three position switch in the location I wanted to put the idle up, that and I started my RC life flying heli's where idle up has a slightly different meaning but is very important.

RE: RedWing MX2 Build
 

What radio? If you have a computer radio that will let you do custom mixes of any sort, you can probably get this functionality.

RE: RedWing MX2 Build
 

I already have fuel tubing to stop the wheels...
And futaba t7c. Will go try to program a pmix later tonight.

RE: RedWing MX2 Build
 

The 7Cap should have Idle down built in... I owned one and I used it all the time.[8D]

RE: RedWing MX2 Build
 

Now that you say it yes i can see now that its another way to use the "throttle kill" function!

Just a shame that the 7c only has one three position switch.

RE: RedWing MX2 Build
 

hi guys

JC 28cc or DLE-30 for this bird plus when is the green scheme going to be available

RE: RedWing MX2 Build
 

I love my JC 28 in my MX2! The MX2 is a great airframe, and when matched with the JC 28, it flies awesome! Here are a few pictures of mine:

RE: RedWing MX2 Build
 

gabarber

what about the DLE-30 any words regarding its performance with this bird ?? <br type="_moz"/>

RE: RedWing MX2 Build
 

I can't speak on the DLE-30- I've never owned one. I would imagine that performance would be similar though.

I do like the price difference though- the JC costs $269.00 and the DLE costs $319. For those of us on a budget, that $50.00 is a lot!

RE: RedWing MX2 Build
 

hobbyking have the DLE-30 on 201$ so that is even cheaper than the jc engine price wise let alone i heared lots of good things about DLE engines ( never owned a gas engine before ). what setup u have in ur bird ?


p.s: your have a lovely one hope u are enjoying it :)

RE: RedWing MX2 Build
 

The only problem with buying from them (HK) will be warranty. Th JC28 will be covered and repaired here in the states by Henry's crew, where as the DLE may have to be shipped overseas at your expense and will be gone for a long time.

Thanks for the compliments on my MX2- I love mine a lot, and I will be keeping it for LONG TIME!

RE: RedWing MX2 Build
 

First of, congratulations! That's a fine plane you have there. As far as your idle speed problem I am not so sure from looking at the spark plug photo but it seems to me you may be running a slightly high fuel/oil mix. What's your fuel mix ratio and what type oil are you running?

It's my belief that the the higher the fuel mix (depending on oil type) the more combustion temperature is required to burn the oil and the lower the contribution of the oil that's being burned to the total energy required to turn the prop. In the case of oil.gas mixes of 32:1 and or when the oil have very high flash point there will be higher amount of unburned oil and the need to supply additional gas to the carburetor to produce more energy. That is more evident in high performance oils (ie. BelRay at 32:1 and Amsoil @ 100:1) than most other organic oils and some synthetics.

There are a couple of very informative papers on the RC Aero website. One on [link=http://www.rcaer.com/userfiles/file/RC%20Aero%20-%202%20Stroke%20Oil%20Testing%20Summary.pdf]2 stroke oil testing[/link], and another on [link=http://www.rcaer.com/userfiles/file/RC%20Aero%20-%202%20Stroke%20Engine%20Tuning%20Technique.pdf]2 stroke tuning techniques[/link] that will be if immense help to you.


Please keep in mind that with all 2 stroke gas engines the low idle speed mix will affect in large amount the transition and maximum high speed operation. The better your idle mix the better the total throttle response.

For those reason it may be necessary for you to enrich your low speed mix in order to maintain a slightly higher head temperature and consequently a consistent idle speed. It's been my experience that gas engines (even with perfect oil mix ratios and carb adjustment) require to be brought up to temperature in order to maintain proper throttle response.

RE: RedWing MX2 Build
 

I totally agree with you in and that there is possibly a very high oil content on the fuel mix. There is two ways to remedy that; one, decrease the oil mix or, two, enrich the gas mix.

RE: RedWing MX2 Build
 

regarding the warranty i wont benift from it either way, because as you see from my profile i live in the middle of the desert ( kuwait ) hahaha so wherever i buy it from it will be shipped to kuwait. you didnt tell me what is ur setup for the mx2 what battries regulators kill switch etc ur using ?

RE: RedWing MX2 Build
 

I'm on the manuals recomended 40:1 for breakin.. Not sure of the oil brand, its labled as two stroke bike oil...