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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Hyper main needle setting
02-06-2006 06:21 PM  12 years agoPost 1
tomi2004

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west yorkshire,England

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I no its another post on hyper needle settings,
but does anyone run the main needle at 3/4 of a turn out,mine at 1 1/2 is really rich and sounds pants, at my current setting i can leave my finger on the back plate for easily for 10 secs, (is the back plate rule true)

fuel is magnum 20% and smokes real good#

what do you think of the tight needle setting?

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02-06-2006 07:27 PM  12 years agoPost 2
falcon

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UK

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I must agree mine is making that much smoke it brought tears to my eyes. I have put a gallon through it and i am now starting to lean it out.I am about 1 1/2 turns out and it does tend to burble a bit until the head winds up.I am using Magnum 30% Curtis Muscle pipe.
Cheers
Kent

www.m0kwr.com

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02-06-2006 07:29 PM  12 years agoPost 3
J3DI

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Oswestry, Shropshire. UK

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Like yours, i had mine tuned wrong. I had the top end too lean and the bottom end too rich. I had about a 1 turn on the main and mixture setting at its stock position.

Now that someone helped me tune it right, i have main needle just over 2 turns out and mixture setting about 30 degrees lean of the stock setting. My hyper now spins up nice and clean on the deck, it starts much easier and also it cured my revlock from hunting when hovering in idle-up.

I'm using Bekra 16 now but was also recently using coolpower 15 (not enough oil content!).

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02-06-2006 08:22 PM  12 years agoPost 4
tomi2004

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west yorkshire,England

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Hey tweakit,

I'll give it a go at the weekend, i'll turn main somewhere between 1, 1/2 to 2 and play with my high end screw, but being careful of the highend screw as i've heard you can go too far if your not carfull

Tom

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02-06-2006 09:10 PM  12 years agoPost 5
robhurlin

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Pretoria, South Africa

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Also 30 degrees on lean side of midpoint on idle screw and 1 1/2 turns out on main needle, and it is still a bit rich for second gallon of running in. 15% Nitro, 4500' altitude (usually leaner setting than coastal).

Rob.

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02-06-2006 09:43 PM  12 years agoPost 6
v58 fuy

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UK - Kent

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Guys,

Good to see your posts, I was going to start a thread looking for some help with my hyper 50 and MP2, but you guys are talking the same thing.

I fitted a new MP2 to upgrade from the std TT muffler and flew today first time. Most of the time spent trying to get the needles about right, ended up with high at about 1 3/4 turns open and idle about 10 deg lean of stock centre position. I'm running a headspeed of about 1850 with 20% Magnum fuel.

A couple of questions I have are, firstly the exhaust pattern in flight seems to have a constant central area, but with a kind of spatter smoke effect around the central smoke area. And secondly on my last flight I noticed right next to the black hex head screw opposite the idle screw there was a small black air bubble - I wiped it away and tightened the hex screw slightly and flew again - all was fine - any suggestions?

David

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02-07-2006 08:40 AM  12 years agoPost 7
J3DI

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Oswestry, Shropshire. UK

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Fuy
Not sure about the black air bubble came from so can't help there. The guy that helped tune mine (runs a model shop in Yorkshire, UK)commented that some people have difficulty leaning off the idle mixture enough on hypers. By leaning off the idle screw it will enable you to richen the main needle more. Obviously every setup is slightly different and i would recommend you monitor the temperature of the backplate carefully. Just to mention, it's difficult to check the high needle setting by monitoring the backplate because by the time you land the engine is idling and the mixture is now controlled by the low needle!

Tomi: I guess if you unscrew the main too far it could drop out! I havn't checked how many turns you need to do that.

Get the bottom end running right first (keep the main rich), lean the idle screw until the heli picks up clean from tickover into the hover. Then concentrate on the main by doing climbouts, etc and check for bogging. Don't go mad with the main needle, just one or two clicks at a time until you get there.

**EDIT** Just read the other thread Fuy, sorry about duplicating some of your information.

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02-07-2006 12:50 PM  12 years agoPost 8
HellRaiser

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Bristol, UK

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OS Hyper needle settings
Glad to se its not only me with this problem, terrible burbles on spool up and tail kicking when hovering, I have just fitted an Enya 4
plug to run a bit cooler, but will now try needle settings as above.

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02-07-2006 01:08 PM  12 years agoPost 9
J3DI

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Oswestry, Shropshire. UK

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HellRaiser

I could barely spool up on my old needle settings, if i wasn't careful it would cut-out because it was too rich. Revised settings produce a nice clean spool up and no kicking or hunting from the revlock.

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02-07-2006 02:47 PM  12 years agoPost 10
robhurlin

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Pretoria, South Africa

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Hi David,
I am also running my Hyper 50 with an MPII (and TT600 blades). My IU2 speed is 1800 on the head giving 17000 on the engine with the standard R50SE gear ratio of 8.5. Your needle settings sound very similar to mine after correcting for altitude and temperature (summer over here now at 4500'. My exhaust plume also has a steady core with splattery outer core, but this reduced when I leaned my idle screw out a bit more. It probably comes from the geometry of the MPII since the flow has to turn 180 degrees to get from the outer cylinder to the inner one. It is also possibly some of the cooler oil vapour.
I haven't seen any black bubbles on my baby!
Enjoy,

Rob.

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02-07-2006 03:29 PM  12 years agoPost 11
v58 fuy

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UK - Kent

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Rob,

I think my idle still could do with a little leaning, as said it's about 10 deg lean, think it will end up at about 15-20 deg. The tiny air bubble present on the brass coloured idle plate next to the hex screw went when I nipped up the hex screw a quarter turn - but have ordered a full set of carb o-rings today so will change all to be safe.

Your headspeed of 1800 unfortunately doesn't give you 17000 on the motor at 8.5 gear ratio - see below:

1800 rpm head = 15300 rpm engine
1900 rpm head = 16150 rpm engine
2000 rpm head = 17000 rpm engine

I didn't want to run as high as 2000, but wanted to be close to max power so run around 1900 on the head.

Many thanks,

David

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02-07-2006 06:51 PM  12 years agoPost 12
robhurlin

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Pretoria, South Africa

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Sorry David, I was thinking of my R90 which runs at an IU2 head speed of 1800 for an engine speed of 15210 @8.45. This is just above the peak power RPM for my 90SZ. I run my 50 Hyper on 2000 at IU2 which, as you point out, is 17000 on the engine. This is right on the OS quoted max power rpm and it is very happy at this speed. We also have to consider which MPII we have. They are designed for a particular gear ratio so that the engine is on the pipe at the right head speed. As far as I know two models are available for the 50 size motor at different gear ratios.
Some guys even run higher head and engine speeds than 2000/17000. Scary huh?

Rob.

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02-07-2006 07:59 PM  12 years agoPost 13
BarracudaHockey

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Jacksonville FL

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He (curtis) only sells the quiet pipe in one version now, I guess they found there was no need for 2 sizes.

The HR or high RPM have been phased out as the LR works on both but the HR only worked on the higher rpm gear ratios.

Andy
AMA 77227
http://www.jaxrc.com

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02-22-2006 06:43 PM  12 years agoPost 14
antsdd

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leeds west yorkshire

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you got that engine running properly yet tom why not sell up and buy a anorak then you will look the part at the side of the railway tracks

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02-23-2006 12:15 AM  12 years agoPost 15
J3DI

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Oswestry, Shropshire. UK

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Who's a buffer kisser?

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02-23-2006 04:37 PM  12 years agoPost 16
Yug

rrMaster

UK. Herts

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Magnum30
Low needle = 1 oclock
High needle = 1 1/4

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03-12-2006 09:37 PM  12 years agoPost 17
hellflyer

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Staten Island NY

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yes the finger test is true but you need to adjust the fuel needle on the throttle slide it sounds to rich on the low side

The first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )

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