RE: Glow-Plugs Recommended By OS Engines  
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RE: Glow-Plugs Recommended By OS Engines - 2/26/2006 6:46:14 PM   
piper_chuck



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quote:

ORIGINAL: DarZeelon


quote:

ORIGINAL: piper_chuck

I'd love it if I could get 9 minutes out of a 16 ounce tank on my .45 boat engines Tell me, is the problem that I'm running too hot a plug?


Maybe not, Chuck...

But if you do, you may only get 7 minutes out of that tank...

Even 7 miinutes would be an improvement. I think the tank is empty at about 5 minutes.

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       Post #: 51

RE: Glow-Plugs Recommended By OS Engines - 2/26/2006 7:04:04 PM   
DarZeelon



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From: Rosh-Ha'Ayin, ISRAEL
Status: online 		Chuck,


Just to put things into some perspective, the big 1.60 MVVS glow (and also Moki 1.80), use less than one ounce per minute, at full power, on 0-5% nitro and with a cold glow-plug.

There is no such thing as fairness, is there?

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       Post #: 52

RE: Glow-Plugs Recommended By OS Engines - 2/26/2006 11:22:28 PM   
STG



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quote:

ORIGINAL: DarZeelon

Chuck,


Just to put things into some perspective, the big 1.60 MVVS glow (and also Moki 1.80), use less than one ounce per minute, at full power, on 0-5% nitro and with a cold glow-plug.

There is no such thing as fairness, is there?


At full throttle? Even the M1.8? I thought I was doing good with my OS160FX flying a mix of 3D and IMAC(mostly lower throttle settings) and getting .8 to.9oz a min.

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       Post #: 53

RE: Glow-Plugs Recommended By OS Engines - 2/27/2006 6:15:53 AM   
DarZeelon



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From: Rosh-Ha'Ayin, ISRAEL
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Using lower nitro will always bring fuel consumption down.

Using a suitable glow-plug will make sure reliability is retained, despite this.


Nitromethane is in part a mono-propellant. It has a stoichiometric ratio range of 0.5-2.5, allowing a wide range of needle settings.
Methanol is much much more sensitive...

...But we are discussing glow-plugs here.

It is a balance between nitro and glow-plug heat range, which you must find, for your engine to be at its best.

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       Post #: 54

RE: Glow-Plugs Recommended By OS Engines - 2/27/2006 12:57:45 PM   
downunder



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quote:

ORIGINAL: DarZeelon
It is a balance between nitro and glow-plug heat range, which you must find, for your engine to be at its best.

To sum up, all that's needed for the engine to be at its best is several $100 worth of every brand and heat range plug you can find, a tacho accurate to at least +-5rpm, a thermometer, wet and dry bulbs for humidity, barometric pressure gauge, a note book full of every possible combination of props, fuels and ambient conditions and you should be set to go.

Or do what I do...grab an old plug, if it glows give it a try. There comes a point when near enough is good enough

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       Post #: 55

RE: Glow-Plugs Recommended By OS Engines - 2/27/2006 8:03:47 PM   
Ernie Misner


 

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From: Tacoma, WA, USA
Status: offline 		Veeeery interesting information Dar. I appreciate your engineering background and sharing with us.

I will be firing up a new ST G90 this spring and tinkering with some ideas, considering the reported rich midrange, likes for low nitro fuel, etc.

What's your (and everyone else's) take on glowplug heat range for the G90 if I stick with the recommended low nitro fuel?

Thanks,

Ernie

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       Post #: 56

RE: Glow-Plugs Recommended By OS Engines - 2/27/2006 8:39:08 PM   
DarZeelon



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quote:

ORIGINAL: downunder

To sum up, all that's needed for the engine to be at its best is several $100 worth of every brand and heat range plug you can find, a tacho accurate to at least +-5rpm, a thermometer, wet and dry bulbs for humidity, barometric pressure gauge, a note book full of every possible combination of props, fuels and ambient conditions and you should be set to go.

Or do what I do...grab an old plug, if it glows give it a try. There comes a point when near enough is good enough


Brian,


I believe the route one should take, is to ask the most trustworthy source; OS-Japan in this case, and bet on what they say.

In the case of the OS.61FX, OS.91FX and OS.65LA engines, the right glow-plug is the OS A5, or another glow-plug with a similar cold heat range.

Only if testing such a plug reveals this plug is too cold for the other conditions one flies in, then you should try a plug one range hotter; i.e. OS #8, MVVS/Novarossi C6, K&B-1L, Enya #4, Etc..


Ernie,


For the ST G90, I believe you should first try an OS A5, or a Rossi R4.
It is a big engine and therefore it is better suited with a cold glow-plug.

It would allow you to lean the high-speed needle more than would a hotter plug and in this particular engine, this affects the mid-range more than in other engines.

Tell me what you find.


I am told the Fox Miracle behaves colder than it is, in this specific engine and suits it pretty well too.


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       Post #: 57

RE: Glow-Plugs Recommended By OS Engines - 2/27/2006 9:48:34 PM   
jaka


 

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Dar... have you actually seen this difference in fuel consumption yourself when using different glowplugs.
During my 31 years in this hobby flying many different airplanes and competing for many years I have never ever seen any difference in fuel consumption just because I have changed glowplugs.... and if its true ...I honestly never giving it any consideration.

The thing about choosing the right glowplug for most pilots (me at least) isn't about fuel consumption, it's about having the engine run properly.

As both being a competitor in pylon racing and scale and being a sport pilot at heart, I have learned that there is seldom such a thing as the right plug for any specific engine. Engines used for different porpoises require different glowplugs.
All this talk about: "OS engines recommends the wrong glow plug " has simply lost its proportions...

Regards!
Jan K
Airracing products
Sweden



< Message edited by jaka -- 2/27/2006 9:52:20 PM >

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       Post #: 58

RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 4:29:55 AM   
DarZeelon



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The answer would have to be a definite "Yes, I have!".

...And it was on a meager OS.46FX that I used to own.



It was emptying the 320 cc fuel tank very quickly; surprisingly so, in fact, with the A3 glow-plug it came with.

I did not understand then why it was so.

After a while I changed the blown A3, to the correct OS #8 in that engine and engine became significantly more frugal.



I never used any large engine and systematically tried different heat-range plugs in it to make sure, but this is an engineering truth.

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       Post #: 59

RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 12:08:54 PM   
jaka


 

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And Dar ... what was the difference?? How many seconds or minutes did it run with either glowplug on the same amount of fuel?

Regards!
Jan K
Sweden

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RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 12:56:09 PM   
DarZeelon



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With the A3 it started going lean in maneuvers within 8-9 minutes.
After changing to the #8, it could run a 10 minute flight, without showing any ill traits.

I never remember encountering any signs of going lean, after changing to the #8, in fact.

With the A3, I had to start checking my landing prospects after just 7 minutes, or so.

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RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 2:22:22 PM   
downunder



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quote:

ORIGINAL: DarZeelon
After changing to the #8, it could run a 10 minute flight, without showing any ill traits.

I must be using a really cold plug in my ST G51 cos I'm getting 6 minutes from 60cc of fuel and that's running really rich in a 4 stroke all the time

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       Post #: 62

RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 2:42:12 PM   
DarZeelon



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quote:

ORIGINAL: downunder

quote:

ORIGINAL: DarZeelon
After changing to the #8, it could run a 10 minute flight, without showing any ill traits.

I must be using a really cold plug in my ST G51 cos I'm getting 6 minutes from 60cc of fuel and that's running really rich in a 4 stroke all the time


I don't know, Brian.

Maybe I could have made 40 minute flights and still have the engine running....
I did not check as soon at it was staying with me for over 10 minutes.

I wanted to emphasize there is a real, noticeable improvement in fuel consumption, when you use a plug that isn't too hot for the engine.



< Message edited by DarZeelon -- 2/28/2006 2:43:48 PM >

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RE: Glow-Plugs Recommended By OS Engines - 2/28/2006 3:59:06 PM   
Bax


 

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Status: offline 		Hmmmm....interesting. We run an O.S. #8 plug or #A3 plug through almost every 2-stroke glow engine and have zero problems when using fuel with 10% nitro and 18% oil. We've als