YS DZ200cdi
 

It seems a few are now using the 200, so thought it was time to start a dedicated thread.

Here a few photos of mine. It's only had 4 tanks through it on the test stand, but is now installed in my Valiant for initial flights.

Once i'm happy, it will go into my Xareltoo.

I am getting 6900rpm running rich. On Cdi, 21.5x10.5 prop, 30:10 fuel, break in needle closed.
I expect 7000rpm running leaner with tappeds adjusted.

Shane

I'm at 6700 at the moment. 30:9 Rapicon and the break in needle is still open a smidge. I'll fully close it once I get a few flights on it.

I think 6900 would be a good max rpm.

3 flights with the 200 in the Valiant this morning. The wind was gusting up to 33kmh, so it wasn't very nice flying, but the engine ran very well with no problems. It's still running rich, but is making plenty of power. it will be a great engine once tuning is complete.

Break in needle is now fully closed and the idle is rock steady.

I'll install it in the Xareltoo now and if the wind calms down, I'll take it for a fly later today.

What's the break in needle?

There is a needle on the end of the throttle barrel. Opening this allows some of the fuel to bypass the intake and goes back into the crankcase. The purpose is to get more lubrication on the big end while breaking in the engine.

It has a big affect on performance, so after break in, should be fully closed or almost closed. Open 1/2 turn, makes it difficult to tune.

8 flights today with the Xareltoo and he engine is running great. Just as smooth as the 185 and appears to use around the same amount of fuel.

Just need to fine tune the throttle curve now.

AWSOME Scott,

Let us know how you set up the throttle curve.
Are you using the same fuel as 185 ?
Iridium plug?
What is your idle RPM ?

regards

Con

Same fuel and standard YS plug.

Idle around 2k for landing.. I usually bump it up to 2100 while flying.

Hello Scot

Any pictures of YS 200 on Xareltoo ?
I put them on our french forum
Claude

Hi Claude,

Doesn't look any different than the 185:rolleyes:

While not a DZ200, I set mine up so that the idle is as low as possible, then have it bump up a few percent when I switch to the spin condition to minimise the risk of a flame out. Also, I try to take advantage of the fore-aft movement of the engine in the YS mount by positioning the throttle arm so the aft movement of the engine during down-line braking closes the throttle a bit more, and the forward movement when at power opens the throttle a bit.

Not sure if any of it helps me but the placebo effect does wonders..

Not according to the instructions.

Test stand is one thing. In an actual plane and flying is another.

There's no need to get a super low idle, that's just asking for trouble.

Too many YS engine stoppages that have been blamed on the engine, have been caused by too low a idle.

On the ground, the engine must be able to idle reliably and steady for at least 30 - 40 seconds and then throttle up without any hesitation or burbling. If it can do that, then it shouldn't quit when going into spins.
Mine can idle for well over a minute and still throttle up immediately.

After you've been flying and ready to land, bring the idle back a few clicks. The engine will generally idle a bit faster once it is hot, so don't worry about it stopping. The idle speed needs to be just slow enough so that it will sit on the runway without moving.

I've been using those Nishioka brace for two years now. Yes, it does work for fore & aft movement, but not on the rotational side.

I've also been using the YS mount from version I through III for about ten years now with good results. However, ever since changing to the non-cdi 185, I started to notice the rubber material on the mount ring deteriorates much quicker, even with the stiffer version III mount which came out right after the 170 period. I've been experimenting with the Taue Mount from Japan - an attachment to the YS mount about a year ago with pretty good results.

Almost 99% of YS pilot in Japan favors the cdi with smoother idle. Therefore, have lesser problem with rotational force. However, some of them also have experienced the rubber deteriorating problem.

Adrian

Attachment 2241579CK Aero | Accessories

Or ,you can get the New Hyde Mount from Me at CK Aero.net
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takes care of all the issues and almost 1 ounce lighter !
Bryan

My engines don't quit at idle in downlines. Or anywhere else.

My idle speed is rock steady and stable. Speed throughout the flight is very constant and landings present no problems. Most times, the plane needs to be flown in under a bit of power.

I've had one of these for awhile, but haven't used it yet due to weight.

Hey Bryan,

I've been going to get one. Just haven't got around to it yet :rolleyes:

I try to take advantage of the movement, so the rearward movement does close the throttle further while braking in down lines. Maybe the glow guys would have a problem if the throttle position is goes too low during a down line if the plug cools off, then it'd be game over when you try to throttle up, but with the cdi, so as long as the engine is spinning you're getting spark.

Gday Adrian,

Does this Taue Mount from Japan attach to the back of the YS Mount ?
What is the advantage ?

regards

Hi,

Yes, it attaches to the back of the YS mount with a fairly thick rubber O ring in between, & it's very light weight. As mentioned, because of the tremendous torque of the 185 it generates a lot of rotational movement - especially the non-cdi version - the rubber tend to deteriorates fairly quickly (at least in my case). Unfortunately, we can not replace the rubber material ourselves, the attachment just make the mount a bit stiffer & reduces movement.

Best

Thanks..... Can you tell me the total weight and also what is the website for purchase ?

regards