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HelicopterGasser Model RC HelicoptersOther › Throttle Curve Changes after break in.
10-19-2009 06:32 PM  8 years agoPost 1
Malc1

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EVESHAM,UK

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Just wondering really.....

On my Spectra my normal flight mode is set up to use a preset curve and the GV-1 is off.

The curve is low as you would expect to give you the required headspeed and has been noticably lower than the 1660 set up in ID1 - as you would expect.

I flew for a short time yesterday and even though I have not touched the tx settings the normal mode headspeed had increased and seemed to me to be equal to or above the setting at ID1.

Switching flight mode seemed to reduce it!!

The other two flight modes seemed OK.

The engine has had about 2 1/2 gallons through now and possibly still needs fine tuning.
I was wondering if its normal for you to have to lower your initial curves a great deal to reduce the headspeed as you continue to put time on the engine after intial breakin.

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10-19-2009 07:01 PM  8 years agoPost 2
shawmcky

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in an american accent
Have you leaned it out any Bud

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10-19-2009 08:14 PM  8 years agoPost 3
Malc1

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Not recently since running a gallon through it

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10-19-2009 08:55 PM  8 years agoPost 4
gramey

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United Kingdom

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Malcolm I probably wrong but most folk reckon that the engine produces maximum power after 4 to 5 gallons. I would assume that during this time as the power increases then you'd possibly need to lower your curve slightly to offset this.

Dumb thumb specialist

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HelicopterGasser Model RC HelicoptersOther › Throttle Curve Changes after break in.
10-19-2009 09:31 PM  8 years ago •• Post 5 ••
carpman

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Spain

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...what Graham said above

Plus its going to change all the time you tweak those needle...

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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10-19-2009 10:04 PM  8 years agoPost 6
AceBird

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Utica, NY USA

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I was wondering if its normal for you to have to lower your initial curves a great deal to reduce the headspeed as you continue to put time on the engine after intial breakin.
Some possibilities:

1. You made trim adjustments to the throttle which may be only affective in the normal mode (depending on radio).
2. Possible interaction with rotary knobs that affect pitch and throttle, only in the normal mode (depending on radio).
3. Engine is broken in and has more power now which will increase headspeed.
4. Something is causing the mixture to lean out some if the mixture was rich to begin with.

Ace
What could be more fun?

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10-19-2009 11:30 PM  8 years agoPost 7
Malc1

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EVESHAM,UK

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Thanks for the input guys
However

No trim adjustments have been made at all on the tx for any mode.

I haven`t got rotary control knobs at all on the JR DSX9 and the hover trim amd pitch trim slide levers are disabled.

The engine may well need to be leaned out a bit but I have been reluctant to do so until I was sure that it had enough full through it.

Don`t know about the mixture leaning out - maybe.

I suppose I had better lean it out myself a bit then.

Its just knowing by how much and when its right.

I have noted that it does bog out a bit on a hard climb out.(lean or too rich?)

So it may be Tuning tips are needed then I think - I`ll try that first.

Don`t want to fry that engine though.

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10-20-2009 06:51 AM  8 years agoPost 8
shawmcky

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Isle of Wight,United Kingdom

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Rule of thumb on needles is to stay very close to the manual settings
11/4 on the low end needle,1/12 on the high,and you wont go far wrong.
While running in a heavy oil mix might make the engine erratic along with the bedding in process.Check your plug colour regularly to make sure its a biscuit colour.Things should improve all the time as you get farther into proper run in.Note,a heavy mix wont hurt but might make the engine bog till it clears its throat after running at lower revs.I run my Zen,s at 50.1 now that they are all run in which seems a good mix,all my engine were erratic on a heavy run in mixture.

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10-20-2009 07:45 AM  8 years agoPost 9
Malc1

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EVESHAM,UK

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I have not yet had the plug out at all to check the mixture so that will be my first job I think.
Its got to running rich I would have thought but those settings are probably somewhere near what I`ve got here.

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10-20-2009 09:18 AM  8 years agoPost 10
pgkevet

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Wales

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..within the few emails that Ian Oddie did actually send me .. he recommended castrol RX77 out of the easier UK options .. at 35:1 for all stages.
.. what you do with that snippet...??

pgk

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10-20-2009 09:34 AM  8 years agoPost 11
shawmcky

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cant say
ive heard of that oil,if that is what he recommends for his motors then so be it.If you take out the plug Malc and it is wet around the face of the threaded part,it is probably due to a heavy oil mix but i would not worry too much about changing the oil quantity till you are well and truly run in.A heavy oil content will give the same symptoms as a rich mix so dont lean down the low needle much below 11/4 as you dont want a lean motor,it may sound better but it is easy to go too lean and screw the motor.

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10-20-2009 11:35 AM  8 years agoPost 12
pgkevet

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Wales

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Brain fart.. XR77
<<Features / Benefits
Typical Characteristics

Castrol XR77 Is the ultimate pre-mix racing 2-stroke engine oil based on fully synthetic technology.
Since the unveiling of Castrol A747 in 1976 there have been numerous technical developments in the field of
Grand Prix Road Racing and competition engine power has risen from 300 bhp/litre to over 400 bhp/litre.
Engine design now also allows for the use of unleaded fuels without significant performance drop despite
unleaded fuel having different composition and properties than other fuels.
High lubricity to prevent seizure in over-speed conditions - allows tuners to lean out their engines to a maximum
Sustained engine power throughout the race
Visible spark plug and piston crown deposits for fine race tuning - high levels of deposits and good tones giving
excellent readability on all unleaded fuels
Wet weather throttle lubrication - XR77 is formulated to prevent throttle slide sticking in wet conditions
Ease of mixing with racing gasoline - and minimal effect on the octane rating of high performance fuels allowing
maximisation of engine compression>>

..for what it's worth

pgk

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10-20-2009 11:50 AM  8 years agoPost 13
Malc1

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EVESHAM,UK

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I`ll have to wait until I get back from work later to get that plug out and take a look.
Any doubts about it I`ll get a photo posted up for you boys to check out.

Still using the original supplied plug as well - does that matter?

Raja sent me out a different brand sometime back but I`ve not even looked at it yet.

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10-20-2009 12:27 PM  8 years agoPost 14
shawmcky

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I expect you have the stock Champion plug?
Most use the Ngk CMR7H as a prefered plug over the Champion.Cheapest place to buy is E-bay and i use the CMR6H as well as it is a hotter plug and burns off the carbon deposits better if you suffer with carbon fouling(more likely with a heavy oil mix)i always buy two of each type as they are not necessarily easy to come by locally.If you fly really hard the "7" is probably your best choice.I use a semi-syn oil but each have their own preferences but i aint no 3D pilot unless i am about to crash

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10-20-2009 06:44 PM  8 years agoPost 15
xcellgasman101

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WOODWARD, OKLA....

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Sounds to me like your engine is loosening up, and produceing more power,, Congats,, your engine is finially broke in,, now go out there and fly the snot out of it,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com

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10-20-2009 06:49 PM  8 years agoPost 16
Malc1

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EVESHAM,UK

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I`ve just pulled the plug to see what the mixture settings are like.

What do you think?

The photo is a pretty good match to the actual colour as well

Its the standard supplied Champion RZ7C after about 2 1/2 gallons.

The one Raja sent me out is a NGK CMR7H - still in the box.

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10-20-2009 07:20 PM  8 years agoPost 17
shawmcky

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From that pic
looks a little lean Malc.Centre of plug should be a brown,hob nob biscuit sort of colour.like one in pic,but slightly darker.

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10-20-2009 07:33 PM  8 years agoPost 18
carpman

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Spain

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I was always told that you should pull and read the plug after a flight, not when its cooled or sat in the basement for a few days is that correct???

Trouble with computers is that on my monitor both the above plug pictures look pretty much the same

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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10-20-2009 07:40 PM  8 years agoPost 19
shawmcky

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Looks yellowy colour to me in the centre
It will still be a good indication of mix after the last run,but what you say is technically correct as when best to check the plug colour.

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10-20-2009 07:45 PM  8 years agoPost 20
Malc1

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EVESHAM,UK

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The Spectra was last flown for one flight on Sunday afternoon

So it looks like it needs richening very slightly then?

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HelicopterGasser Model RC HelicoptersOther › Throttle Curve Changes after break in.
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