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HelicopterEngines Plugs Mufflers Fuel › Standard YS91 Head into Viper like Head
11-21-2006 05:27 PM  11 years agoPost 41
Pinkbike

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UK

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..

www.kickstartphotography.com

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11-21-2006 06:14 PM  11 years agoPost 42
UK Helinut

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Gloucestershire

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BA i was so impressed when I flew your Vibe on Sunday,
You better put me down for a slot in your build plan.

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11-21-2006 06:31 PM  11 years agoPost 43
Below Average

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not to worry pinkbike you'll be the first in my cross-hairs

How was I to know she had a wooden leg

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11-21-2006 06:52 PM  11 years agoPost 44
Simon - R

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uk

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BA .....head on way !!!

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11-21-2006 07:24 PM  11 years agoPost 45
Arky

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Corfe Mullen, Dorset, UK

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i hope your head is good

my wife wont even look at my head let alone totch it

she says helis bore her to death

Jason

Wee.Splat

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11-21-2006 09:42 PM  11 years agoPost 46
Pinkbike

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11-21-2006 09:46 PM  11 years agoPost 47
Below Average

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one day you will say something of consequence pinkbike

How was I to know she had a wooden leg

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11-21-2006 10:18 PM  11 years agoPost 48
Droid

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Deep down in the Southwest- UK

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I feel inclined to chime in here but it would only be rude and smutty, so i wont!

Quotes may have been changed for my own amusement

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11-21-2006 10:33 PM  11 years agoPost 49
colsy

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Cambridge, UK

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DROID, do you realise Below Average is offering to machine heads for others, these are made from metal, not plastic.

A material you have yet to work with.

So even you couldn't be rude and smutty, in a perfectly sensible thread.

Colin..

Only Quote From Experience.

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11-21-2006 11:04 PM  11 years agoPost 50
Pinkbike

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www.kickstartphotography.com

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11-22-2006 09:04 PM  11 years agoPost 51
Below Average

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Just completed a OS70 SX for Simon-R, pictures to follow in an hour or so

How was I to know she had a wooden leg

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11-22-2006 09:16 PM  11 years agoPost 52
Droid

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Deep down in the Southwest- UK

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Colsy,

I think you'll find i could it was the following remark that brought a teeny weeny little smirk to my face, which i wasn't going to share until you pulled the plastic fantastic stunt AGAIN!!
i hope your head is good
Just had a little picture in my head, sorry i know i'm a little warped

Quotes may have been changed for my own amusement

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11-22-2006 11:28 PM  11 years agoPost 53
Below Average

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OS70 SX with twin plug, sorry about the polish but the head was very pitted (best i could do) F.O.C.

How was I to know she had a wooden leg

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11-23-2006 11:47 AM  11 years agoPost 54
Jafa

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Sydney, Australia

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Looks like brilliant work to me

What plugs did you use?

The Bellwood dual plug heads used to run
with Enya 3 and 4 plugs together


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-23-2006 04:21 PM  11 years agoPost 55
Below Average

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These are both OS8's, would you put a hotter plug in the middle or underneath?

How was I to know she had a wooden leg

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11-23-2006 04:37 PM  11 years agoPost 56
DS 8717

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Seems like you would want the colder plug underneath because it will cause the mixture to ignite first and you dont want preignition. DOUG

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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11-23-2006 05:33 PM  11 years agoPost 57
Simon - R

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uk

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looks good BA can't wait to put it on and try it ,making a "Y" lead up at the moment so the glow supply will energise both plugs together ,going to run it off my power panel so i can vary the amperage. simon

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11-23-2006 08:10 PM  11 years agoPost 58
Jafa

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Sydney, Australia

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There is absolutely no point to lighting both plugs for starting

With Belwood heads we put the hotter plug in the middle,
the cooler plug was for the idle (Enya 3 and 4)
and certainly did made the idle smoother
(not that idling is a huge concern to me)
That was the most noticable difference with a Belwood head

I do like the dual plug idea - like the Alpha Romeo twin spark engines - meant to make the flame front spead out side ways faster (before forcing the piston down) which apparently is very important


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-23-2006 08:50 PM  11 years agoPost 59
Simon - R

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uk

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Jafa , why is there no point in lighting both plugs together ? this particular engine does not idle very well and when you try to spool it up it sometimes cuts ,yes its a bit on the rich side but twin plugs is bound to help ....twice the glow for starters !!!

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11-23-2006 10:47 PM  11 years agoPost 60
Jafa

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Sydney, Australia

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You are obviously able to start the engine,
it wont start much different with two plugs lit
(on my heli's it would be a PITA to connect the 2nd glow)

You will get a much greater improvement in the engine performance
but solving the real problem, why is it rich and why does it cut?
Wrong glow heat range? Fuel mixture (nitro level)?
Carb needs to be stripped and cleaned out maybe
Is the ring still black (not worn out)?
Once all the above are sorted, then it's tuning.

When you remove the glow battery and then spool up,
if you are so rich that it cuts,
I would expect both plugs to snuff it.
You're engine is currently operating outside the sweet spot.

When you are in the sweet spot two plugs can make it smoother.

When you have two plugs,
the redundancy protection is against
mechanical failure of the primary plug.
There is no real protection from cuts due to being too rich.

I must admit that the ratio of fuel volume to glow area has changed,
but I doubt that it will have the effect you want.
You need hotter glow or less fuel.
If it did work, the engine may be unhappy at idle up RPM.

Every now and again you get a engine that's a challenge,
just don't let frustration (or too much enthusiasm)
detract from the fundament princpals


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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HelicopterEngines Plugs Mufflers Fuel › Standard YS91 Head into Viper like Head
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