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RE: RCAero JC Engines & YDA Engines - 11/25/2010 6:18 AM   
Tseres


 

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ORIGINAL: plane addicts

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ORIGINAL: Tseres

I made some linkage mods so I can hook the linkage up the way that I want to. Made a new arm and corrected the geometry for the servo location that I want to use. I'll finalize that when I get the plane. The choke is going to be manual and the rod will come out on the bottom of the cowl. Right now this will work for the run in stand. I would have had more done on the stand but I got called away to do some domestic honey doos.


I just left mine stock and moved adjusted it at the servo for a 1:1 ratio. I then adjusted the curve in my transmitter.



I never used the throttle curve adjustment in my radio before. I'm going to try it on this one.
I did it like that so I don't have the throttle rod interfering with the adjustment needles and since I like the Spring loaded choke set up on the 28. I wanted to retain it on this carb also. I will remove the idle adjustment screw after I hook it up to the servo in the plane. I find it easier to adjust the servo throws that way. Once that is set up I don't ned the screw anymore.

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RE: RCAero JC Engines & YDA Engines - 11/25/2010 7:55 PM   
plane addicts


 

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Status: offline 		Yeah I was lucky and didnt have to make an extention on either of my planes so far I had the motor on.


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RE: RCAero JC Engines & YDA Engines - 11/26/2010 2:50 PM   
ceecrb1



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Status: offline 		So, new motor!!
Today i'm working late so got up nice and early and headed to the club, nobody here so no one to annoy while tuning!

Wow! What a change! Initially i was worried as i couldnt get it to start but it turns out it arrived with the low needle at one turn out and the high completely closed.
After 10 mins of tuning i had it in the air!!
First flight it was gurgling quite a bit so for the 2nd i leaned it slightly.
For the 2nd flight it sounded like gradually through the flight it was loosing power at high revs, to the point that i cut the flight early and landed.

When i pick up the plane and point it say 45 degrees down the engine slows, and nose up the engine speeds up??
Does this mean bad carb like said earlier or is this normal?
Its doing the same on uplines in flight, definetely loosing power as it climbs.

Finally, flying on. 16x8, would the be 16x9 better for pattern flying or the 8?


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RE: RCAero JC Engines & YDA Engines - 11/26/2010 3:40 PM   
Tseres


 

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ORIGINAL: ceecrb1

So, new motor!!
Today i'm working late so got up nice and early and headed to the club, nobody here so no one to annoy while tuning!

Wow! What a change! Initially i was worried as i couldnt get it to start but it turns out it arrived with the low needle at one turn out and the high completely closed.
After 10 mins of tuning i had it in the air!!
First flight it was gurgling quite a bit so for the 2nd i leaned it slightly.
For the 2nd flight it sounded like gradually through the flight it was loosing power at high revs, to the point that i cut the flight early and landed.

When i pick up the plane and point it say 45 degrees down the engine slows, and nose up the engine speeds up??
Does this mean bad carb like said earlier or is this normal?
Its doing the same on uplines in flight, definetely loosing power as it climbs.

Finally, flying on. 16x8, would the be 16x9 better for pattern flying or the 8?


You are messing with the motor to much. You have to let it break in. It takes a little time. Did you peak it out at the top end? Go yo max RPM that you can get. Reduce it by 200rpm. Leave that as your setting no matter what for now. Adjust the low needle to where it takes throttle smoothly. Now fly 2 gallons of gas through it and leave it alone. It doesn't mater where your needles are set. They need to be set where the engine runs. Every one is a little different.

Remember You have to break it in before it runs great. Break it in! Break it in! Break it in!

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RE: RCAero JC Engines & YDA Engines - 11/26/2010 3:52 PM   
AJsToyz



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Status: offline 		Good morning Tom!

Hope your feeling good and stuffed after yesterday!!

Ok, now I'm going to be a pain!! LOL I totally agree with you on the set it and run it BUT the two gallon rule. I'm not picking on you because it seems all the manufacturers use the same rule. I really think they need a better rule!!

If you run a 26cc on two gallons for break in lets say you get 20 minutes on a 10 ounce tank about 8 1/2 hour break in
If you run a 56cc on two gallons for break in lets say you get 20 minutes on a 20 ounce tank about 4 1/4 hour break in
If you run a 112cc on two gallons for break in lets say you get 20 minutes on a 40 ounce tank about 2 1/8 hour break in

Seems like there should be a better rule thats all.

Ok, I'm going back in my hole now ....

Andy

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RE: RCAero JC Engines & YDA Engines - 11/26/2010 5:15 PM   
Tseres


 

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Status: offline 		God morning Andy. Yes I'm stuffed. I trust you are to.

I agree with what you are saying. I just would like ceecrb1 to be a little more patient. I was the same way not to long ago. You probably remember that. He will have it running great before then but he needs to know that it won't happen overnight. Right now he is just baffled because he thinks it should be better. But it's new and the hardest thing to do is wait for something to run like it should. Some how we have to make him realize that if he keeps twisting on things, it will take him longer to achieve his goals. Now that you let the cat out of the bag he needed an explanation.


PS: The prop is to small for the engine and he shouldn't be doing up lines for about 5 tank fulls. The engine could be slowing down cause it's overheating if he has the cowl on. The outlet air on the bottom of the cowl should be 2 to 1 ratio to the intake, minimum. Don't know what could be causing the rpm change while tilting the plane if the engine don't die while in the tail up position. I do know that it will run better with time.



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RE: RCAero JC Engines & YDA Engines - 11/26/2010 6:07 PM   
AJsToyz



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Status: offline 		Yup!

Will run better with time with out a doubt. I have on of my engines needs more time but its going in for other reasons. I know it won't get run in until spring now but have time to get things right. I'm running batteries down a little as we speak for storage until spring.

Andy

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RE: RCAero JC Engines & YDA Engines - 11/26/2010 6:42 PM   
Planeclothes


 

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quote:

ORIGINAL: ceecrb1

So, new motor!!
Today i'm working late so got up nice and early and headed to the club, nobody here so no one to annoy while tuning!

Wow! What a change! Initially i was worried as i couldnt get it to start but it turns out it arrived with the low needle at one turn out and the high completely closed.
After 10 mins of tuning i had it in the air!!
First flight it was gurgling quite a bit so for the 2nd i leaned it slightly.
For the 2nd flight it sounded like gradually through the flight it was loosing power at high revs, to the point that i cut the flight early and landed.

When i pick up the plane and point it say 45 degrees down the engine slows, and nose up the engine speeds up??
Does this mean bad carb like said earlier or is this normal?
Its doing the same on uplines in flight, definetely loosing power as it climbs.

Finally, flying on. 16x8, would the be 16x9 better for pattern flying or the 8?


I agree with old Tom, at least for the next 2 gallons of gas, just set it and forget it, and break it in! IMO a 16x?? is not enough prop for this engine. I used a Xoar 18/6 for break in and that's what I still use for everyday flying. As for the engine losing rpm with the nose slightly down, mine still does it, and it is fully broken in. I went through 3 exchanges and they all showed this peculiarity. This issue was addressed but never completely solved, IMO. It has nothing to do with the engine itself or the carb, it has everything to do with the reed block design. The ones sold here in the US were modified with an extra part added to the reed block which improves the tilt down effect (does not completely eliminate it) but at the price of losing rpm's at the top end due to reduced flow of fuel into the engine. This is just my personal opinion, and it is based on my own personal experience.

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RE: RCAero JC Engines & YDA Engines - 11/26/2010 8:18 PM   
ceecrb1



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Status: offline 		Sorry I had my iphone fingers out there I did mean 18x6!!!

I am NOT adjusting the motor.. i promise!!

Had another flight this evenging after work.. thats 4 in one day!!! Mirracle

This afternoon there were some others at the club, their opinion is that it even sounds different.

When i´m inverted there is a very noticble drop in RPM.. again, normal breakin thing or should I be talking to dealer about something?


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RE: RCAero JC Engines & YDA Engines - 11/26/2010 9:42 PM   
JVB


 

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Status: offline 		Very tough to diagnose via internet. However, generally a loss of RPM without accompanying rough running (4-stroking) would indicate a lean condition. I would open the low end up a bit at a time and see if that helps. In-air mixture control sure would be handy at times.

I have an RCGF 45 that would quit suddenly with no warning every time the planed pushed negative Gs. Kept opening the low end until it would run through negative Gs without quitting. On a lark, I checked the timing. It was set at 19 degrees BTDC instead of 28 degrees. I adjusted the timing to 28 degrees. With the two adjustments, it now runs very well.

I will also echo what the other guys have said. Run a couple of gallons through it before you get too worried about performance. Also, always make carb adjustments when the engine is warmed up.

I have two JC 28s. One has a gallon through it and the other two tankfuls. Both run well.

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RE: RCAero JC Engines & YDA Engines - 11/26/2010 10:51 PM   
ceecrb1



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Status: offline 		Like i say, its only when inverted, performing a roll and even I tried a tumble, and same thing, drop in RPM during the maneuver

Other than that.. things are SOOOOOO much better than the first engine.. trust me the difference is like night and day!!
This engine I dont NEED to go playing with the carb.. the last one I did!

This engine just reminds me so much more of a standard "new" 2 stroke glow.. same "experience".. Ie high rpm.. short on power, but its giving you hints of what the end result will be!


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RE: RCAero JC Engines & YDA Engines - 11/27/2010 3:21 AM   
plane addicts


 

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Status: offline 		Now you say you hear a drop of RPM on a roll or tumble. is this for a split second. My reason for asking is that you redirecting the sound of the engine through the muffler away from you for a few seconds. I found this to be something that made me uncomfortable when I first flew gassers. I was so use to listening to the high pitch scream of a glow engine lol. So when I got my first gassers the muffled sould made me think my engine was not running right.

Like a broken record fly it for a while more you sound like you are doing ok.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 3:42 AM   
Tseres


 

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Status: offline 		Got the run in box finished up and mounted everything to see how it fits. I have the same gripe with every engine I have. The prop screws are to short. Got a beilla 27-10 mounted on it and it looks like the prop is to thick. But it is also possible that the center shaft is to short. The center shaft is just long enough to mount the prop and prop washer. Of course the prop washer is pretty sloppy on the shaft. This I found to be a problem on every engine except DA. So you say what is the big deal. Well it's balance. It is very hard to center up the washer so it don't run out. If it runs out then it will put your prop assembly out of balance. That isn't good for the bearings. i want to use a spinner so the center shaft will be to short with the prop that I have.


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RE: RCAero JC Engines & YDA Engines - 11/29/2010 3:48 AM   
plane addicts


 

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Status: offline 		Box set-up looks good. Have you ran her yet. If you need longer bolts you can get some at fastenal. I had to to this to install my spinner and Xoar prop on my MXSR.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 4:00 AM   
Tseres


 

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ORIGINAL: plane addicts

Box set-up looks good. Have you ran her yet. If you need longer bolts you can get some at fastenal. I had to to this to install my spinner and Xoar prop on my MXSR.


No I have not run it yet. I live in town and will have to take it to the flying site so my neighbors don't get huffy with me. I plan on using screws to fasten it to the set up bench. Should be solid and it should also dampen vibrations since the bench is made of wood.
I'll probably try running it next week end. I still need to get a temp gage to monitor the temp. That way I know when to shut it down to cool. Don't want to over heat it.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 4:11 AM   
Tseres


 

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Status: offline 		I forgot to mention and the picture isn't to clear. The aluminum flat stock is the manual throttle servo. It is connected by a ball link to nirod to activate the throttle. The arm is secured by velcro from rotating to keep it at an RPM that I want to run the engine at. This way I don't need a radio, receiver and a servo to operate the throttle. I think this setup will work well but I'll tell you if it don't. I'm sure I'll take a short video of the start up. A friend of mine wants to be there for the start up. I might as well use him as a camera man.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 5:33 AM   
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Status: offline 		Hey Tseres nice test stand! I use a steel saw horse from lowes to bolt the box to it comes with like .250" holes in it about 2" from each end
as I remember. Only thing you need to tie it down to a tree or a stake or it will try to fly on ya! Especially with that twin!

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 5:42 AM   
Tseres


 

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Hey Tseres nice test stand! I use a steel saw horse from lowes to bolt the box to it comes with like .250'' holes in it about 2'' from each end
as I remember. Only thing you need to tie it down to a tree or a stake or it will try to fly on ya! Especially with that twin!


That's why I'm going to bolt it down to a setup stand at the field.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 2:27 PM   
RCplanman


 

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Status: offline 		Tseres, might I ask, what is the gauge in # 3 picture?. Thanks, Bill

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 3:01 PM   
aussiesteve



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Status: offline 		I'm not Tom but I can answer your question.

It is an RCExcel Tacho. They plug into the 3rd set of wires coming fom the ignition (I often I get asked what the 3rd set of wires is for). Or it can be "y: leaded to the hall sensor line on the earlier ones. Takes the need to hold a photo tach near the prop.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 5:26 PM   
barchiola


 

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Status: offline 		do those little tachs draw much from the ignition battery? are they typically left in the plane while it's flying or only used for set-up?
thanks,
bart

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 5:55 PM   
Tseres


 

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do those little tachs draw much from the ignition battery? are they typically left in the plane while it's flying or only used for set-up?
thanks,
bart


I don't know how much electricity it draws but its minimal and so is the weight. I use mine for a few flights till the engine is broke in then I take it out. The novelty will wear off then it will be another tool like your screw diver. I have mine on velcro and can switch it from plane to plane. I do have 3 Tach's however. I had four but one of my flying buddies got one off of me for an early Christmas present.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 8:14 PM   
apalsson



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ORIGINAL: barchiola

do those little tachs draw much from the ignition battery? are they typically left in the plane while it's flying or only used for set-up?
thanks,
bart


Bart,

The tachos only draw between 25 and 60mAh from your ignition battery, depending on the ignition battery voltage and RPM.

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 8:30 PM   
barchiola


 

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Status: offline 		thanks guys. those look pretty handy.
i should order one from henry and just have him send it with the kill switch that was missing from the engine i bought.
regards,
bart

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RE: RCAero JC Engines & YDA Engines - 11/29/2010 8:41 PM   
plane addicts


 

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Status: offline 		They are a very hand thing to have around. We sell this things a good bit. I install them the same way that Tom does. Like he said there is no since in having them stuck in the same airframe after you got it set-up.

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