Guys

I spent the last few days tweaking my 185 and adjusting the needles.
I`m so impressed with this motor. The flight times are so good I can fly two p or f patterns and land with 2 ounces of fuel left in the tank, an 18.Oz tank. this is the Non CDI Version! it will get better once this thing breaks in and I can lean it some.

Running a 20.5-10 APC the power on the bottom is so good and smooth. the tone is sweeter and vibration reduced throught the whole throttle range. I had so much flight time on a gallon, I almost forgot to charge my on board pack ( kinda ruined my routine ) it confused me a little trying to figure out how I flew all day on a gallon. I lost track of how many patterns I flew. I had to go to a negative throttle curve to get the same power feel from the 175.
I love this motor more every time I run it.

It`s a Home run!

Bryan

Hey Bryan,

Just imagine how much better it would be with a 10 or 12oz tank... Fuel is heavy!

Cheers,
Jason.

Hi Jason


With the fuel on the cg you cannot tell any difference from full to empty !
I used to run a 12 oz tank in one of my valiants with the cdi and felt I was cheating myself, although the E guys loved it :)
Having the ability to fly back to back patterns in practice one P one F same conditions is a luxury and time savings you have to experience to appreciate !
With a 20oz tank ,I might get three patterns on a calm day Hummmm,,

Bryan

From personal experience, not everyone is thrilled with our ability to fly 20 minutes on a tank of gas. Then again, my situation could be unique....

Hi Matt,

I was only speaking from a power to weight ratio. If one considers that 20oz of fuel weighs approximately 600 grams halving that amount does affect the vertical performance. It certainly did in my old Pinnacle with a 140RX. I did a lot of work lightening this model and it made significant difference at the top of a vertical. The YS would probably not suffer here but I can only presume that performance would benefit. Like towing a trailer behind the car.

A 20 minute flight is probably too much for me. Personally, I like to have a flight (8 min) and then review it in preparation for the next flight. It also gives other members a fair go at the flight line. ;-) Everyone to their own though so if it works for you and you have the field to yourself then do it.

Cheers,
Jason.

We have been flying for years two complete sequences on a single tank of 500 and 600cc, it is so good when after one sequence you can simply start all over again trying to improve the previous.

The 185 is without a doubt the best YS yet, and nothing compares in power and torque to this one yet, and we will see the real animal when the new prop from APC is out, wich should be any moment now.

I too am waiting for the185 prop. I'm getting 7400 rpm with the 185cdi.
If the new prop pulls that back to around 7100 it will be much better. Make more use of the huge amount of torque these engines have.
When someone knows they are released, maybe they can post here.

I struggled to make weight with my Valiants. Switching from the 18oz tank to an 11oz tank saved 15 grams. If I can get more weight out, i may put the18 back.
I plan my practise when there is no one at the field, so flight time isn't a issue for me.

Well, you can always fly gas, as I do. A 240 ml tank will fly about 12-13 minutes or about 1 1/2 sequences. And gas is much less dense than glow so the weight gain is about 6 ounces. An 8 oz tank in the middle of the cavernous fuses looks a little silly. I admit, but it works normally as one expects.

The OS GT33 piped 2 stroke gassie puts out similar power to the YS175; a little better top end for the same props but slightly lesser brakes at idle. Very similar mid range tork. The YS185 based on Bryan's and Adrian's reports is at a different, higher level. I'm all for that....but not about to change my gassies....

Let me suggest that you make your own from an XOAR or Falcon ELECTRIC woody. Shape it like an APC, thin the blades down and sharpen the TE. Then cover it with 3K carbon cloth and epoxy, and bag it. This is a proven working concept that I have used on many props. It sounds like the engine should turn something like a 22x10 or 22 x 12. And BTW, any APC of this size will weigh about 200 grams. The woody-carbon hybrid weighs about 85-90 grams. Juuust a little weight savings.

One of the better props I've made for my GT33 is a 20 1/4 x 12. The engine loves that prop and it is very similar to an APC blade shape. APC's are the best in design.

Hi Matt,

I agree that the new 185 APC may be around 200 grams. The 20.5 X 10, is 35 grams heavier than the 19 X 11 i used on my 170 cdi. A 22" prop less than a 100 grams would be great. 100 grams is a huge amuont of weight to save in a pattern ship.

APC props are an excellent prop. If only they would make them lighter.

Hey Scott?

Those weights for the APC props are amazing. I'm so used to the EL props at 40 grams.. Spoilt lol...

Have you looked to see what Mezjlik have available for the 185? They make some real nice props for both IC and electric.

Cheers,
Jason.

Hi Jason,

I haven't looked at anything other than APC. It's just what has always been used on YS's, as they are an excellent prop.

It may be worth experimenting.

Sent you a PM Matt.

Scott, PM answered.

Forgot to mention that my 20.25 x 12 carbon-wood hybrid weighs 77 grams. Not quite electric like on weight but fairly close. One thing certain, lighter props definitely fly better reducing plane reaction to higher G stuff. As always, your milage may vary

I just got a 185 and had a very difficult time with break in simply because I followed the instructions in the box. However, 2 turns in not NEAR enough. when you get the new engine go out at least 3 and 1/2 turns to start. Also run at high idle for a very long time-10-12 oz, then increase gradually and run another tank through it. Use at least 20-30 oz of oil rich fuel to break in. I missed or don't see this info posted anywhere.

With my 185cdi's, I started 2 1/2 turns out and ran 1 tank through on the ground and the idle was nice and steady. I then flew and gradually leaned it off over the next few flights. I've ended up at 1-1 5/8 turns out. I used the same oil content that i fly with and have had no problems.


My 185's are about 1/2 turn further out than my 175's.

Drac,
That would be consistent with what I am doing. Mine is the non CDI version so it requires a more open needle. Mine 175 non CDI is about 1 1/2 turns out. With non CDI I recommend the 3 plus turns out to start.
Mike

With the cdi you can run the engine 1/2 a turn leaner. I ran my 175cdi with a glow plug and had to open the needle 1/2 a turn.

sounds good.

Hi Guys, I'm new to these forums so please be patient. I have just installed a YS185 in an Asyuler. Is the regulator setting correct out of the box. Out of the box screw is level with outer case.1/4 past 9 . On this setting with needle valve 2 turns out engine revs picks up to about half throttle then starts running rough and won't pick up further RPM

Okay thats the needle valve setting but did you guys leave the regulator setting where it was out of the box or does this need tweaking as well. ( By the way its a non cdi 185)

it is very deceiving. open the high speed over 3 full turns, maybe more and try again. Also, richen the low end as well.

Regulator is too rich.

Quickset,
what happened? a couple of us responded but we have heard nothing from you.

Hello all! What prop sizes are people using for the 1.85 cdi?

20.5 X 10PN.

I have the 21 X 10.5 coming to try.

I 've been using the same prop on the OS GT33. Works very well. Except the prop is so darned heavy I'm getting weird airplane gyrations.

Scott what kind of numbers is yours turning this prop at full revs?

Hi Matt,

6900-7000. Ths is around 200 less than some others, but I mix my own fuel and I think the calorific value of the methanol I use is less than some of the pre mixed fuels. The engine has also done alot of work, so probably could do with a new ring which I will do soon.

Thanks. I'm getting similar output on my 4 year old 33. The 20.5 x 10 may not be the most load still. I hear a little prop noise. I wish there was an 11 pitch. Just don't want to bend it myself.

I know you have a GT33 project in the works. The throttle curve is pretty strange compared to the glow stuff but throttle can be tamed with some work and thought.

I have a 21X 10.5 coming, so will be interesting to see how that goes.
From what I hear, if the pitch is changed on a APC, it will gradually go back to the original pitch?

The 20.5 x 10 is a 175 prop, whereas the 21 x 10.5 is designed for the 185.

Interesting. So they either narrowed the blades even more to keep rpm at 6900 or left them the same and are stiving to reduce rpm a couple 100 r's. I suppose striving to get closer to electric rpms. I'm an interested bystander, not so much for the YS but for the prop.

Hi All
I'm just getting into setting up my new ship, and was wondering about the cdi 185 zero. Has anyone tried the 'zero' version? Any thoughts? Is it worth going that way, and have the same running and power characteristics of the non 'zero' version? Or should I stick with the normal non 'zero' cdi 185.

If the Zero version produced the same power as the Nitro version, it would be a no brainer. But as they say, you can't have the cake and eat it.
From what I've read, the zero doesn't make as much power which makes sense. Nitro equals power.

Run whichever one suits what you want. If you're after cheaper running costs, go with the zero. If you want power, then its nitro.

Scott, did you run the 21x10.5"? Results?

Hey Matt,

No not yet. I have the props, but been busy. I hope to get one balanced and try next week when I get home.

Matt,

I've been flying with the 21x10.5 PN, a lot of prop for the 185. The engine can handle it but need to throttle up sooner, & be sure to have enough ventilation, especially on a hot day. I may shorten it to a 20.5x10.5 & give that a try.

There's a prototype 21.5x10.5 also.

Adrian

Hi Adrian, and thanks for the info. Are you saying that you no longer point the nose up, then throttle up like you used to do? That now the model gets slow enough to need throttle up before the corner?

The 20.5x10 PN should be doing a fine job on the 185, on moderate nitro. What exactly are the slightly bigger props supposed to deliver? A slower presentation possibly? Or something else?

HI Matt,

My Aiolos is slightly over 5K dry, & weighs more with a full tank of 600cc fuel. In addition, I'm using the same throttle curve for both the 20.5" & 21" prop & believe the 21" is probably better suited for the cdi version. As stated, the motor will handle the prop, but just needed to throttle up slightly earlier in my case. However, I think I will try it again on my Acuracy which only weighs about 4,800 dry

However, I do like the higher pitch, it pulls just like a freight train. They do make a 21x10PN but I felt like I can use a bit more pitch, hence the reason why I wanted to try the 10.5 pitch. After I've a chance to try the 20.5x10.5 I'll report back.

Adrian

I've had a chance over the last couple of weeks to finally install and play with the ignition in my Galactik. So far very happy. I spent most of the year running straight glow with the 20.5X10, but I'm running the 21X10.5 at about 6750 with a consistent idle of around 1650. I can comfortably fly 2 P-17 sequences on the stock 600cc tank. Throttle response is excellent and very smooth. So far, very happy with the setup.

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